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2714 | cejka | 1 | /* $NetBSD: jobs.c,v 1.36 2000/05/22 10:18:47 elric Exp $ */ |
2 | |||
3 | /*- |
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4 | * Copyright (c) 1991, 1993 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * This code is derived from software contributed to Berkeley by |
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8 | * Kenneth Almquist. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without |
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11 | * modification, are permitted provided that the following conditions |
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12 | * are met: |
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13 | * 1. Redistributions of source code must retain the above copyright |
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14 | * notice, this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright |
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16 | * notice, this list of conditions and the following disclaimer in the |
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17 | * documentation and/or other materials provided with the distribution. |
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18 | * 3. All advertising materials mentioning features or use of this software |
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19 | * must display the following acknowledgement: |
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20 | * This product includes software developed by the University of |
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21 | * California, Berkeley and its contributors. |
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22 | * 4. Neither the name of the University nor the names of its contributors |
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23 | * may be used to endorse or promote products derived from this software |
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24 | * without specific prior written permission. |
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25 | * |
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26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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36 | * SUCH DAMAGE. |
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37 | */ |
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38 | |||
39 | #include <sys/cdefs.h> |
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40 | #ifndef lint |
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41 | #if 0 |
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42 | static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; |
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43 | #else |
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44 | __RCSID("$NetBSD: jobs.c,v 1.36 2000/05/22 10:18:47 elric Exp $"); |
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45 | #endif |
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46 | #endif /* not lint */ |
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47 | |||
48 | #include <fcntl.h> |
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49 | #include <signal.h> |
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50 | #include <errno.h> |
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51 | #include <unistd.h> |
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52 | #include <stdlib.h> |
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53 | #include <paths.h> |
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54 | #include <sys/types.h> |
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55 | #include <sys/param.h> |
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56 | #ifdef BSD |
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57 | #include <sys/wait.h> |
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58 | #include <sys/time.h> |
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59 | #include <sys/resource.h> |
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60 | #endif |
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61 | #include <sys/ioctl.h> |
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62 | |||
63 | #include "shell.h" |
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64 | #if JOBS |
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65 | #if OLD_TTY_DRIVER |
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66 | #include "sgtty.h" |
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67 | #else |
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68 | #include <termios.h> |
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69 | #endif |
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70 | #undef CEOF /* syntax.h redefines this */ |
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71 | #endif |
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72 | #include "redir.h" |
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73 | #include "show.h" |
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74 | #include "main.h" |
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75 | #include "parser.h" |
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76 | #include "nodes.h" |
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77 | #include "jobs.h" |
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78 | #include "options.h" |
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79 | #include "trap.h" |
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80 | #include "syntax.h" |
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81 | #include "input.h" |
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82 | #include "output.h" |
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83 | #include "memalloc.h" |
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84 | #include "error.h" |
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85 | #include "mystring.h" |
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86 | |||
87 | |||
88 | struct job *jobtab; /* array of jobs */ |
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89 | int njobs; /* size of array */ |
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90 | MKINIT short backgndpid = -1; /* pid of last background process */ |
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91 | #if JOBS |
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92 | int initialpgrp; /* pgrp of shell on invocation */ |
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93 | short curjob; /* current job */ |
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94 | #endif |
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95 | STATIC int intreceived; |
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96 | |||
97 | STATIC void restartjob (struct job *); |
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98 | STATIC void freejob (struct job *); |
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99 | STATIC struct job *getjob (char *); |
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100 | STATIC int dowait (int, struct job *); |
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101 | STATIC int onsigchild (void); |
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102 | STATIC int waitproc (int, int *); |
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103 | STATIC void cmdtxt (union node *); |
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104 | STATIC void cmdputs (const char *); |
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105 | STATIC void waitonint(int); |
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106 | |||
107 | |||
108 | #if JOBS |
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109 | /* |
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110 | * Turn job control on and off. |
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111 | * |
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112 | * Note: This code assumes that the third arg to ioctl is a character |
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113 | * pointer, which is true on Berkeley systems but not System V. Since |
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114 | * System V doesn't have job control yet, this isn't a problem now. |
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115 | */ |
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116 | |||
117 | MKINIT int jobctl; |
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118 | |||
119 | void |
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120 | setjobctl(on) |
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121 | int on; |
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122 | { |
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123 | #ifdef OLD_TTY_DRIVER |
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124 | int ldisc; |
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125 | #endif |
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126 | |||
127 | if (on == jobctl || rootshell == 0) |
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128 | return; |
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129 | if (on) { |
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130 | do { /* while we are in the background */ |
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131 | #ifdef OLD_TTY_DRIVER |
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132 | if (ioctl(fd2, TIOCGPGRP, (char *)&initialpgrp) < 0) { |
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133 | #else |
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134 | initialpgrp = tcgetpgrp(fd2); |
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135 | if (initialpgrp < 0) { |
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136 | #endif |
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137 | out2str("sh: can't access tty; job control turned off\n"); |
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138 | mflag = 0; |
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139 | return; |
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140 | } |
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141 | if (initialpgrp == -1) |
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142 | initialpgrp = getpgrp(); |
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143 | else if (initialpgrp != getpgrp()) { |
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144 | killpg(initialpgrp, SIGTTIN); |
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145 | continue; |
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146 | } |
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147 | } while (0); |
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148 | #ifdef OLD_TTY_DRIVER |
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149 | if (ioctl(fd2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) { |
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150 | out2str("sh: need new tty driver to run job control; job control turned off\n"); |
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151 | mflag = 0; |
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152 | return; |
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153 | } |
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154 | #endif |
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155 | setsignal(SIGTSTP); |
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156 | setsignal(SIGTTOU); |
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157 | setsignal(SIGTTIN); |
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158 | setpgid(0, rootpid); |
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159 | #ifdef OLD_TTY_DRIVER |
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160 | ioctl(fd2, TIOCSPGRP, (char *)&rootpid); |
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161 | #else |
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162 | tcsetpgrp(fd2, rootpid); |
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163 | #endif |
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164 | } else { /* turning job control off */ |
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165 | setpgid(0, initialpgrp); |
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166 | #ifdef OLD_TTY_DRIVER |
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167 | ioctl(fd2, TIOCSPGRP, (char *)&initialpgrp); |
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168 | #else |
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169 | tcsetpgrp(fd2, initialpgrp); |
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170 | #endif |
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171 | setsignal(SIGTSTP); |
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172 | setsignal(SIGTTOU); |
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173 | setsignal(SIGTTIN); |
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174 | } |
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175 | jobctl = on; |
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176 | } |
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177 | #endif |
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178 | |||
179 | |||
180 | #ifdef mkinit |
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181 | INCLUDE <stdlib.h> |
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182 | |||
183 | SHELLPROC { |
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184 | backgndpid = -1; |
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185 | #if JOBS |
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186 | jobctl = 0; |
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187 | #endif |
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188 | } |
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189 | |||
190 | #endif |
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191 | |||
192 | |||
193 | |||
194 | #if JOBS |
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195 | int |
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196 | killcmd(argc, argv) |
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197 | int argc; |
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198 | char **argv; |
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199 | { |
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200 | extern char *signal_names[]; |
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201 | int signo = -1; |
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202 | int list = 0; |
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203 | int i; |
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204 | pid_t pid; |
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205 | struct job *jp; |
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206 | |||
207 | if (argc <= 1) { |
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208 | error( |
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209 | "Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n" |
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210 | "kill -l [exitstatus]" |
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211 | ); |
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212 | } |
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213 | |||
214 | if (*argv[1] == '-') { |
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215 | signo = decode_signal(argv[1]+1); |
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216 | if (signo < 0) { |
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217 | int c; |
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218 | |||
219 | while ((c = nextopt("ls:")) != '\0') |
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220 | switch (c) { |
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221 | case 'l': |
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222 | list = 1; |
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223 | break; |
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224 | case 's': |
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225 | signo = decode_signal(optarg); |
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226 | break; |
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227 | default: |
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228 | error( |
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229 | "nextopt returned character code 0%o", c); |
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230 | } |
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231 | } else |
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232 | argptr++; |
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233 | } |
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234 | |||
235 | if (!list && signo < 0) |
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236 | signo = SIGTERM; |
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237 | |||
238 | if ((signo < 0 || !*argptr) ^ list) { |
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239 | error( |
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240 | "Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n" |
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241 | "kill -l [exitstatus]" |
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242 | ); |
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243 | } |
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244 | |||
245 | if (list) { |
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246 | if (!*argptr) { |
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247 | out1fmt("0\n"); |
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248 | for (i = 1; i < NSIG; i++) { |
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249 | if (strncmp(signal_names[i], "SIGJUNK(", 8) |
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250 | == 0) |
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251 | continue; |
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252 | out1fmt("%s\n", signal_names[i] + 3); |
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253 | } |
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254 | return 0; |
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255 | } |
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256 | signo = atoi(*argptr); |
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257 | if (signo > 128) |
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258 | signo -= 128; |
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259 | if (0 < signo && signo < NSIG) |
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260 | out1fmt("%s\n", signal_names[signo] + 3); |
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261 | else |
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262 | error("invalid signal number or exit status: %s", |
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263 | *argptr); |
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264 | return 0; |
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265 | } |
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266 | |||
267 | do { |
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268 | if (**argptr == '%') { |
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269 | jp = getjob(*argptr); |
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270 | if (jp->jobctl == 0) |
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271 | error("job %s not created under job control", |
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272 | *argptr); |
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273 | pid = -jp->ps[0].pid; |
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274 | } else |
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275 | pid = atoi(*argptr); |
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276 | if (kill(pid, signo) != 0) |
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277 | error("%s: %s", *argptr, strerror(errno)); |
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278 | } while (*++argptr); |
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279 | |||
280 | return 0; |
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281 | } |
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282 | |||
283 | int |
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284 | fgcmd(argc, argv) |
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285 | int argc; |
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286 | char **argv; |
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287 | { |
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288 | struct job *jp; |
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289 | int pgrp; |
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290 | int status; |
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291 | |||
292 | jp = getjob(argv[1]); |
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293 | if (jp->jobctl == 0) |
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294 | error("job not created under job control"); |
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295 | pgrp = jp->ps[0].pid; |
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296 | #ifdef OLD_TTY_DRIVER |
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297 | ioctl(fd2, TIOCSPGRP, (char *)&pgrp); |
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298 | #else |
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299 | tcsetpgrp(fd2, pgrp); |
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300 | #endif |
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301 | restartjob(jp); |
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302 | INTOFF; |
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303 | status = waitforjob(jp); |
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304 | INTON; |
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305 | return status; |
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306 | } |
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307 | |||
308 | |||
309 | int |
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310 | bgcmd(argc, argv) |
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311 | int argc; |
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312 | char **argv; |
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313 | { |
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314 | struct job *jp; |
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315 | |||
316 | do { |
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317 | jp = getjob(*++argv); |
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318 | if (jp->jobctl == 0) |
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319 | error("job not created under job control"); |
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320 | restartjob(jp); |
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321 | } while (--argc > 1); |
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322 | return 0; |
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323 | } |
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324 | |||
325 | |||
326 | STATIC void |
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327 | restartjob(jp) |
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328 | struct job *jp; |
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329 | { |
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330 | struct procstat *ps; |
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331 | int i; |
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332 | |||
333 | if (jp->state == JOBDONE) |
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334 | return; |
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335 | INTOFF; |
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336 | killpg(jp->ps[0].pid, SIGCONT); |
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337 | for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { |
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338 | if (WIFSTOPPED(ps->status)) { |
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339 | ps->status = -1; |
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340 | jp->state = 0; |
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341 | } |
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342 | } |
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343 | INTON; |
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344 | } |
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345 | #endif |
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346 | |||
347 | |||
348 | int |
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349 | jobscmd(argc, argv) |
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350 | int argc; |
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351 | char **argv; |
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352 | { |
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353 | showjobs(0); |
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354 | return 0; |
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355 | } |
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356 | |||
357 | |||
358 | /* |
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359 | * Print a list of jobs. If "change" is nonzero, only print jobs whose |
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360 | * statuses have changed since the last call to showjobs. |
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361 | * |
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362 | * If the shell is interrupted in the process of creating a job, the |
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363 | * result may be a job structure containing zero processes. Such structures |
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364 | * will be freed here. |
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365 | */ |
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366 | |||
367 | void |
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368 | showjobs(change) |
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369 | int change; |
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370 | { |
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371 | int jobno; |
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372 | int procno; |
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373 | int i; |
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374 | struct job *jp; |
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375 | struct procstat *ps; |
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376 | int col; |
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377 | char s[64]; |
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378 | |||
379 | TRACE(("showjobs(%d) called\n", change)); |
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380 | while (dowait(0, (struct job *)NULL) > 0); |
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381 | for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { |
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382 | if (! jp->used) |
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383 | continue; |
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384 | if (jp->nprocs == 0) { |
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385 | freejob(jp); |
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386 | continue; |
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387 | } |
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388 | if (change && ! jp->changed) |
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389 | continue; |
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390 | procno = jp->nprocs; |
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391 | for (ps = jp->ps ; ; ps++) { /* for each process */ |
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392 | if (ps == jp->ps) |
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393 | fmtstr(s, 64, "[%d] %ld ", jobno, |
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394 | (long)ps->pid); |
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395 | else |
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396 | fmtstr(s, 64, " %ld ", |
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397 | (long)ps->pid); |
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398 | out1str(s); |
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399 | col = strlen(s); |
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400 | s[0] = '\0'; |
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401 | if (ps->status == -1) { |
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402 | /* don't print anything */ |
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403 | } else if (WIFEXITED(ps->status)) { |
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404 | fmtstr(s, 64, "Exit %d", |
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405 | WEXITSTATUS(ps->status)); |
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406 | } else { |
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407 | #if JOBS |
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408 | if (WIFSTOPPED(ps->status)) |
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409 | i = WSTOPSIG(ps->status); |
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410 | else /* WIFSIGNALED(ps->status) */ |
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411 | #endif |
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412 | i = WTERMSIG(ps->status); |
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413 | if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) |
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414 | scopy(sys_siglist[i & 0x7F], s); |
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415 | else |
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416 | fmtstr(s, 64, "Signal %d", i & 0x7F); |
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417 | if (WCOREDUMP(ps->status)) |
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418 | strcat(s, " (core dumped)"); |
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419 | } |
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420 | out1str(s); |
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421 | col += strlen(s); |
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422 | do { |
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423 | out1c(' '); |
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424 | col++; |
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425 | } while (col < 30); |
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426 | out1str(ps->cmd); |
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427 | out1c('\n'); |
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428 | if (--procno <= 0) |
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429 | break; |
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430 | } |
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431 | jp->changed = 0; |
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432 | if (jp->state == JOBDONE) { |
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433 | freejob(jp); |
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434 | } |
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435 | } |
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436 | } |
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437 | |||
438 | |||
439 | /* |
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440 | * Mark a job structure as unused. |
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441 | */ |
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442 | |||
443 | STATIC void |
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444 | freejob(jp) |
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445 | struct job *jp; |
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446 | { |
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447 | struct procstat *ps; |
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448 | int i; |
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449 | |||
450 | INTOFF; |
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451 | for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { |
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452 | if (ps->cmd != nullstr) |
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453 | ckfree(ps->cmd); |
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454 | } |
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455 | if (jp->ps != &jp->ps0) |
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456 | ckfree(jp->ps); |
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457 | jp->used = 0; |
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458 | #if JOBS |
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459 | if (curjob == jp - jobtab + 1) |
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460 | curjob = 0; |
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461 | #endif |
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462 | INTON; |
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463 | } |
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464 | |||
465 | |||
466 | |||
467 | int |
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468 | waitcmd(argc, argv) |
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469 | int argc; |
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470 | char **argv; |
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471 | { |
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472 | struct job *job; |
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473 | int status, retval; |
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474 | struct job *jp; |
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475 | |||
476 | if (argc > 1) { |
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477 | job = getjob(argv[1]); |
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478 | } else { |
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479 | job = NULL; |
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480 | } |
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481 | for (;;) { /* loop until process terminated or stopped */ |
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482 | if (job != NULL) { |
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483 | if (job->state) { |
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484 | status = job->ps[job->nprocs - 1].status; |
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485 | if (WIFEXITED(status)) |
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486 | retval = WEXITSTATUS(status); |
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487 | #if JOBS |
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488 | else if (WIFSTOPPED(status)) |
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489 | retval = WSTOPSIG(status) + 128; |
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490 | #endif |
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491 | else { |
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492 | /* XXX: limits number of signals */ |
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493 | retval = WTERMSIG(status) + 128; |
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494 | } |
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495 | if (! iflag) |
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496 | freejob(job); |
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497 | return retval; |
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498 | } |
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499 | } else { |
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500 | for (jp = jobtab ; ; jp++) { |
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501 | if (jp >= jobtab + njobs) { /* no running procs */ |
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502 | return 0; |
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503 | } |
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504 | if (jp->used && jp->state == 0) |
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505 | break; |
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506 | } |
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507 | } |
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508 | dowait(1, (struct job *)NULL); |
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509 | } |
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510 | } |
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511 | |||
512 | |||
513 | |||
514 | int |
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515 | jobidcmd(argc, argv) |
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516 | int argc; |
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517 | char **argv; |
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518 | { |
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519 | struct job *jp; |
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520 | int i; |
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521 | |||
522 | jp = getjob(argv[1]); |
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523 | for (i = 0 ; i < jp->nprocs ; ) { |
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524 | out1fmt("%ld", (long)jp->ps[i].pid); |
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525 | out1c(++i < jp->nprocs? ' ' : '\n'); |
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526 | } |
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527 | return 0; |
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528 | } |
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529 | |||
530 | |||
531 | |||
532 | /* |
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533 | * Convert a job name to a job structure. |
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534 | */ |
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535 | |||
536 | STATIC struct job * |
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537 | getjob(name) |
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538 | char *name; |
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539 | { |
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540 | int jobno; |
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541 | struct job *jp; |
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542 | int pid; |
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543 | int i; |
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544 | |||
545 | if (name == NULL) { |
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546 | #if JOBS |
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547 | currentjob: |
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548 | if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0) |
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549 | error("No current job"); |
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550 | return &jobtab[jobno - 1]; |
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551 | #else |
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552 | error("No current job"); |
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553 | #endif |
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554 | } else if (name[0] == '%') { |
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555 | if (is_digit(name[1])) { |
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556 | jobno = number(name + 1); |
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557 | if (jobno > 0 && jobno <= njobs |
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558 | && jobtab[jobno - 1].used != 0) |
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559 | return &jobtab[jobno - 1]; |
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560 | #if JOBS |
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561 | } else if (name[1] == '%' && name[2] == '\0') { |
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562 | goto currentjob; |
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563 | #endif |
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564 | } else { |
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565 | struct job *found = NULL; |
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566 | for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { |
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567 | if (jp->used && jp->nprocs > 0 |
||
568 | && prefix(name + 1, jp->ps[0].cmd)) { |
||
569 | if (found) |
||
570 | error("%s: ambiguous", name); |
||
571 | found = jp; |
||
572 | } |
||
573 | } |
||
574 | if (found) |
||
575 | return found; |
||
576 | } |
||
577 | } else if (is_number(name)) { |
||
578 | pid = number(name); |
||
579 | for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { |
||
580 | if (jp->used && jp->nprocs > 0 |
||
581 | && jp->ps[jp->nprocs - 1].pid == pid) |
||
582 | return jp; |
||
583 | } |
||
584 | } |
||
585 | error("No such job: %s", name); |
||
586 | /* NOTREACHED */ |
||
587 | } |
||
588 | |||
589 | |||
590 | |||
591 | /* |
||
592 | * Return a new job structure, |
||
593 | */ |
||
594 | |||
595 | struct job * |
||
596 | makejob(node, nprocs) |
||
597 | union node *node; |
||
598 | int nprocs; |
||
599 | { |
||
600 | int i; |
||
601 | struct job *jp; |
||
602 | |||
603 | for (i = njobs, jp = jobtab ; ; jp++) { |
||
604 | if (--i < 0) { |
||
605 | INTOFF; |
||
606 | if (njobs == 0) { |
||
607 | jobtab = ckmalloc(4 * sizeof jobtab[0]); |
||
608 | } else { |
||
609 | jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); |
||
610 | memcpy(jp, jobtab, njobs * sizeof jp[0]); |
||
611 | /* Relocate `ps' pointers */ |
||
612 | for (i = 0; i < njobs; i++) |
||
613 | if (jp[i].ps == &jobtab[i].ps0) |
||
614 | jp[i].ps = &jp[i].ps0; |
||
615 | ckfree(jobtab); |
||
616 | jobtab = jp; |
||
617 | } |
||
618 | jp = jobtab + njobs; |
||
619 | for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); |
||
620 | INTON; |
||
621 | break; |
||
622 | } |
||
623 | if (jp->used == 0) |
||
624 | break; |
||
625 | } |
||
626 | INTOFF; |
||
627 | jp->state = 0; |
||
628 | jp->used = 1; |
||
629 | jp->changed = 0; |
||
630 | jp->nprocs = 0; |
||
631 | #if JOBS |
||
632 | jp->jobctl = jobctl; |
||
633 | #endif |
||
634 | if (nprocs > 1) { |
||
635 | jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); |
||
636 | } else { |
||
637 | jp->ps = &jp->ps0; |
||
638 | } |
||
639 | INTON; |
||
640 | TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, |
||
641 | jp - jobtab + 1)); |
||
642 | return jp; |
||
643 | } |
||
644 | |||
645 | |||
646 | /* |
||
647 | * Fork of a subshell. If we are doing job control, give the subshell its |
||
648 | * own process group. Jp is a job structure that the job is to be added to. |
||
649 | * N is the command that will be evaluated by the child. Both jp and n may |
||
650 | * be NULL. The mode parameter can be one of the following: |
||
651 | * FORK_FG - Fork off a foreground process. |
||
652 | * FORK_BG - Fork off a background process. |
||
653 | * FORK_NOJOB - Like FORK_FG, but don't give the process its own |
||
654 | * process group even if job control is on. |
||
655 | * |
||
656 | * When job control is turned off, background processes have their standard |
||
657 | * input redirected to /dev/null (except for the second and later processes |
||
658 | * in a pipeline). |
||
659 | */ |
||
660 | |||
661 | int |
||
662 | forkshell(jp, n, mode) |
||
663 | union node *n; |
||
664 | struct job *jp; |
||
665 | int mode; |
||
666 | { |
||
667 | int pid; |
||
668 | int pgrp; |
||
669 | const char *devnull = _PATH_DEVNULL; |
||
670 | const char *nullerr = "Can't open %s"; |
||
671 | |||
672 | TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n, |
||
673 | mode)); |
||
674 | INTOFF; |
||
675 | pid = fork(); |
||
676 | if (pid == -1) { |
||
677 | TRACE(("Fork failed, errno=%d\n", errno)); |
||
678 | INTON; |
||
679 | error("Cannot fork"); |
||
680 | } |
||
681 | if (pid == 0) { |
||
682 | struct job *p; |
||
683 | int wasroot; |
||
684 | int i; |
||
685 | |||
686 | TRACE(("Child shell %d\n", getpid())); |
||
687 | wasroot = rootshell; |
||
688 | rootshell = 0; |
||
689 | closescript(); |
||
690 | INTON; |
||
691 | clear_traps(); |
||
692 | #if JOBS |
||
693 | jobctl = 0; /* do job control only in root shell */ |
||
694 | if (wasroot && mode != FORK_NOJOB && mflag) { |
||
695 | if (jp == NULL || jp->nprocs == 0) |
||
696 | pgrp = getpid(); |
||
697 | else |
||
698 | pgrp = jp->ps[0].pid; |
||
699 | setpgid(0, pgrp); |
||
700 | if (mode == FORK_FG) { |
||
701 | /*** this causes superfluous TIOCSPGRPS ***/ |
||
702 | #ifdef OLD_TTY_DRIVER |
||
703 | if (ioctl(fd2, TIOCSPGRP, (char *)&pgrp) < 0) |
||
704 | error("TIOCSPGRP failed, errno=%d", errno); |
||
705 | #else |
||
706 | if (tcsetpgrp(fd2, pgrp) < 0) |
||
707 | error("tcsetpgrp failed, errno=%d", errno); |
||
708 | #endif |
||
709 | } |
||
710 | setsignal(SIGTSTP); |
||
711 | setsignal(SIGTTOU); |
||
712 | } else if (mode == FORK_BG) { |
||
713 | ignoresig(SIGINT); |
||
714 | ignoresig(SIGQUIT); |
||
715 | ignoresig(SIGHUP); |
||
716 | if ((jp == NULL || jp->nprocs == 0) && |
||
717 | ! fd0_redirected_p ()) { |
||
718 | close(0); |
||
719 | if (open(devnull, O_RDONLY) != 0) |
||
720 | error(nullerr, devnull); |
||
721 | } |
||
722 | } |
||
723 | #else |
||
724 | if (mode == FORK_BG) { |
||
725 | ignoresig(SIGINT); |
||
726 | ignoresig(SIGQUIT); |
||
727 | ignoresig(SIGHUP); |
||
728 | if ((jp == NULL || jp->nprocs == 0) && |
||
729 | ! fd0_redirected_p ()) { |
||
730 | close(0); |
||
731 | if (open(devnull, O_RDONLY) != 0) |
||
732 | error(nullerr, devnull); |
||
733 | } |
||
734 | } |
||
735 | #endif |
||
736 | for (i = njobs, p = jobtab ; --i >= 0 ; p++) |
||
737 | if (p->used) |
||
738 | freejob(p); |
||
739 | if (wasroot && iflag) { |
||
740 | setsignal(SIGINT); |
||
741 | setsignal(SIGQUIT); |
||
742 | setsignal(SIGTERM); |
||
743 | } |
||
744 | return pid; |
||
745 | } |
||
746 | if (rootshell && mode != FORK_NOJOB && mflag) { |
||
747 | if (jp == NULL || jp->nprocs == 0) |
||
748 | pgrp = pid; |
||
749 | else |
||
750 | pgrp = jp->ps[0].pid; |
||
751 | setpgid(pid, pgrp); |
||
752 | } |
||
753 | if (mode == FORK_BG) |
||
754 | backgndpid = pid; /* set $! */ |
||
755 | if (jp) { |
||
756 | struct procstat *ps = &jp->ps[jp->nprocs++]; |
||
757 | ps->pid = pid; |
||
758 | ps->status = -1; |
||
759 | ps->cmd = nullstr; |
||
760 | if (iflag && rootshell && n) |
||
761 | ps->cmd = commandtext(n); |
||
762 | } |
||
763 | INTON; |
||
764 | TRACE(("In parent shell: child = %d\n", pid)); |
||
765 | return pid; |
||
766 | } |
||
767 | |||
768 | |||
769 | |||
770 | /* |
||
771 | * Wait for job to finish. |
||
772 | * |
||
773 | * Under job control we have the problem that while a child process is |
||
774 | * running interrupts generated by the user are sent to the child but not |
||
775 | * to the shell. This means that an infinite loop started by an inter- |
||
776 | * active user may be hard to kill. With job control turned off, an |
||
777 | * interactive user may place an interactive program inside a loop. If |
||
778 | * the interactive program catches interrupts, the user doesn't want |
||
779 | * these interrupts to also abort the loop. The approach we take here |
||
780 | * is to have the shell ignore interrupt signals while waiting for a |
||
781 | * forground process to terminate, and then send itself an interrupt |
||
782 | * signal if the child process was terminated by an interrupt signal. |
||
783 | * Unfortunately, some programs want to do a bit of cleanup and then |
||
784 | * exit on interrupt; unless these processes terminate themselves by |
||
785 | * sending a signal to themselves (instead of calling exit) they will |
||
786 | * confuse this approach. |
||
787 | */ |
||
788 | |||
789 | int |
||
790 | waitforjob(jp) |
||
791 | struct job *jp; |
||
792 | { |
||
793 | #if JOBS |
||
794 | int mypgrp = getpgrp(); |
||
795 | #endif |
||
796 | int status; |
||
797 | int st; |
||
798 | struct sigaction act, oact; |
||
799 | |||
800 | INTOFF; |
||
801 | intreceived = 0; |
||
802 | #if JOBS |
||
803 | if (!jobctl) { |
||
804 | #else |
||
805 | if (!iflag) { |
||
806 | #endif |
||
807 | sigaction(SIGINT, 0, &act); |
||
808 | act.sa_handler = waitonint; |
||
809 | sigaction(SIGINT, &act, &oact); |
||
810 | } |
||
811 | TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); |
||
812 | while (jp->state == 0) { |
||
813 | dowait(1, jp); |
||
814 | } |
||
815 | #if JOBS |
||
816 | if (!jobctl) { |
||
817 | #else |
||
818 | if (!iflag) { |
||
819 | #endif |
||
820 | extern char *trap[]; |
||
821 | sigaction(SIGINT, &oact, 0); |
||
822 | if (intreceived && trap[SIGINT]) kill(getpid(), SIGINT); |
||
823 | } |
||
824 | #if JOBS |
||
825 | if (jp->jobctl) { |
||
826 | #ifdef OLD_TTY_DRIVER |
||
827 | if (ioctl(fd2, TIOCSPGRP, (char *)&mypgrp) < 0) |
||
828 | error("TIOCSPGRP failed, errno=%d\n", errno); |
||
829 | #else |
||
830 | if (tcsetpgrp(fd2, mypgrp) < 0) |
||
831 | error("tcsetpgrp failed, errno=%d\n", errno); |
||
832 | #endif |
||
833 | } |
||
834 | if (jp->state == JOBSTOPPED) |
||
835 | curjob = jp - jobtab + 1; |
||
836 | #endif |
||
837 | status = jp->ps[jp->nprocs - 1].status; |
||
838 | /* convert to 8 bits */ |
||
839 | if (WIFEXITED(status)) |
||
840 | st = WEXITSTATUS(status); |
||
841 | #if JOBS |
||
842 | else if (WIFSTOPPED(status)) |
||
843 | st = WSTOPSIG(status) + 128; |
||
844 | #endif |
||
845 | else |
||
846 | st = WTERMSIG(status) + 128; |
||
847 | #if JOBS |
||
848 | if (jp->jobctl) { |
||
849 | /* |
||
850 | * This is truly gross. |
||
851 | * If we're doing job control, then we did a TIOCSPGRP which |
||
852 | * caused us (the shell) to no longer be in the controlling |
||
853 | * session -- so we wouldn't have seen any ^C/SIGINT. So, we |
||
854 | * intuit from the subprocess exit status whether a SIGINT |
||
855 | * occured, and if so interrupt ourselves. Yuck. - mycroft |
||
856 | */ |
||
857 | if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) |
||
858 | raise(SIGINT); |
||
859 | } |
||
860 | #endif |
||
861 | if (! JOBS || jp->state == JOBDONE) |
||
862 | freejob(jp); |
||
863 | INTON; |
||
864 | return st; |
||
865 | } |
||
866 | |||
867 | |||
868 | |||
869 | /* |
||
870 | * Wait for a process to terminate. |
||
871 | */ |
||
872 | |||
873 | STATIC int |
||
874 | dowait(block, job) |
||
875 | int block; |
||
876 | struct job *job; |
||
877 | { |
||
878 | int pid; |
||
879 | int status; |
||
880 | struct procstat *sp; |
||
881 | struct job *jp; |
||
882 | struct job *thisjob; |
||
883 | int done; |
||
884 | int stopped; |
||
885 | int core; |
||
886 | int sig; |
||
887 | |||
888 | TRACE(("dowait(%d) called\n", block)); |
||
889 | do { |
||
890 | pid = waitproc(block, &status); |
||
891 | TRACE(("wait returns %d, status=%d\n", pid, status)); |
||
892 | } while (pid == -1 && errno == EINTR); |
||
893 | if (pid <= 0) |
||
894 | return pid; |
||
895 | INTOFF; |
||
896 | thisjob = NULL; |
||
897 | for (jp = jobtab ; jp < jobtab + njobs ; jp++) { |
||
898 | if (jp->used) { |
||
899 | done = 1; |
||
900 | stopped = 1; |
||
901 | for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { |
||
902 | if (sp->pid == -1) |
||
903 | continue; |
||
904 | if (sp->pid == pid) { |
||
905 | TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status)); |
||
906 | sp->status = status; |
||
907 | thisjob = jp; |
||
908 | } |
||
909 | if (sp->status == -1) |
||
910 | stopped = 0; |
||
911 | else if (WIFSTOPPED(sp->status)) |
||
912 | done = 0; |
||
913 | } |
||
914 | if (stopped) { /* stopped or done */ |
||
915 | int state = done? JOBDONE : JOBSTOPPED; |
||
916 | if (jp->state != state) { |
||
917 | TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); |
||
918 | jp->state = state; |
||
919 | #if JOBS |
||
920 | if (done && curjob == jp - jobtab + 1) |
||
921 | curjob = 0; /* no current job */ |
||
922 | #endif |
||
923 | } |
||
924 | } |
||
925 | } |
||
926 | } |
||
927 | INTON; |
||
928 | if (! rootshell || ! iflag || (job && thisjob == job)) { |
||
929 | core = WCOREDUMP(status); |
||
930 | #if JOBS |
||
931 | if (WIFSTOPPED(status)) sig = WSTOPSIG(status); |
||
932 | else |
||
933 | #endif |
||
934 | if (WIFEXITED(status)) sig = 0; |
||
935 | else sig = WTERMSIG(status); |
||
936 | |||
937 | if (sig != 0 && sig != SIGINT && sig != SIGPIPE) { |
||
938 | if (thisjob != job) |
||
939 | outfmt(out2, "%d: ", pid); |
||
940 | #if JOBS |
||
941 | if (sig == SIGTSTP && rootshell && iflag) |
||
942 | outfmt(out2, "%%%ld ", |
||
943 | (long)(job - jobtab + 1)); |
||
944 | #endif |
||
945 | if (sig < NSIG && sys_siglist[sig]) |
||
946 | out2str(sys_siglist[sig]); |
||
947 | else |
||
948 | outfmt(out2, "Signal %d", sig); |
||
949 | if (core) |
||
950 | out2str(" - core dumped"); |
||
951 | out2c('\n'); |
||
952 | flushout(&errout); |
||
953 | } else { |
||
954 | TRACE(("Not printing status: status=%d, sig=%d\n", |
||
955 | status, sig)); |
||
956 | } |
||
957 | } else { |
||
958 | TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); |
||
959 | if (thisjob) |
||
960 | thisjob->changed = 1; |
||
961 | } |
||
962 | return pid; |
||
963 | } |
||
964 | |||
965 | |||
966 | |||
967 | /* |
||
968 | * Do a wait system call. If job control is compiled in, we accept |
||
969 | * stopped processes. If block is zero, we return a value of zero |
||
970 | * rather than blocking. |
||
971 | * |
||
972 | * System V doesn't have a non-blocking wait system call. It does |
||
973 | * have a SIGCLD signal that is sent to a process when one of it's |
||
974 | * children dies. The obvious way to use SIGCLD would be to install |
||
975 | * a handler for SIGCLD which simply bumped a counter when a SIGCLD |
||
976 | * was received, and have waitproc bump another counter when it got |
||
977 | * the status of a process. Waitproc would then know that a wait |
||
978 | * system call would not block if the two counters were different. |
||
979 | * This approach doesn't work because if a process has children that |
||
980 | * have not been waited for, System V will send it a SIGCLD when it |
||
981 | * installs a signal handler for SIGCLD. What this means is that when |
||
982 | * a child exits, the shell will be sent SIGCLD signals continuously |
||
983 | * until is runs out of stack space, unless it does a wait call before |
||
984 | * restoring the signal handler. The code below takes advantage of |
||
985 | * this (mis)feature by installing a signal handler for SIGCLD and |
||
986 | * then checking to see whether it was called. If there are any |
||
987 | * children to be waited for, it will be. |
||
988 | * |
||
989 | * If neither SYSV nor BSD is defined, we don't implement nonblocking |
||
990 | * waits at all. In this case, the user will not be informed when |
||
991 | * a background process until the next time she runs a real program |
||
992 | * (as opposed to running a builtin command or just typing return), |
||
993 | * and the jobs command may give out of date information. |
||
994 | */ |
||
995 | |||
996 | #ifdef SYSV |
||
997 | STATIC int gotsigchild; |
||
998 | |||
999 | STATIC int onsigchild() { |
||
1000 | gotsigchild = 1; |
||
1001 | } |
||
1002 | #endif |
||
1003 | |||
1004 | |||
1005 | STATIC int |
||
1006 | waitproc(block, status) |
||
1007 | int block; |
||
1008 | int *status; |
||
1009 | { |
||
1010 | #ifdef BSD |
||
1011 | int flags; |
||
1012 | |||
1013 | flags = 0; |
||
1014 | #if JOBS |
||
1015 | if (jobctl) |
||
1016 | flags |= WUNTRACED; |
||
1017 | #endif |
||
1018 | if (block == 0) |
||
1019 | flags |= WNOHANG; |
||
1020 | return wait3(status, flags, (struct rusage *)NULL); |
||
1021 | #else |
||
1022 | #ifdef SYSV |
||
1023 | int (*save)(); |
||
1024 | |||
1025 | if (block == 0) { |
||
1026 | gotsigchild = 0; |
||
1027 | save = signal(SIGCLD, onsigchild); |
||
1028 | signal(SIGCLD, save); |
||
1029 | if (gotsigchild == 0) |
||
1030 | return 0; |
||
1031 | } |
||
1032 | return wait(status); |
||
1033 | #else |
||
1034 | if (block == 0) |
||
1035 | return 0; |
||
1036 | return wait(status); |
||
1037 | #endif |
||
1038 | #endif |
||
1039 | } |
||
1040 | |||
1041 | /* |
||
1042 | * return 1 if there are stopped jobs, otherwise 0 |
||
1043 | */ |
||
1044 | int job_warning = 0; |
||
1045 | int |
||
1046 | stoppedjobs() |
||
1047 | { |
||
1048 | int jobno; |
||
1049 | struct job *jp; |
||
1050 | |||
1051 | if (job_warning) |
||
1052 | return (0); |
||
1053 | for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { |
||
1054 | if (jp->used == 0) |
||
1055 | continue; |
||
1056 | if (jp->state == JOBSTOPPED) { |
||
1057 | out2str("You have stopped jobs.\n"); |
||
1058 | job_warning = 2; |
||
1059 | return (1); |
||
1060 | } |
||
1061 | } |
||
1062 | |||
1063 | return (0); |
||
1064 | } |
||
1065 | |||
1066 | /* |
||
1067 | * Return a string identifying a command (to be printed by the |
||
1068 | * jobs command. |
||
1069 | */ |
||
1070 | |||
1071 | STATIC char *cmdnextc; |
||
1072 | STATIC int cmdnleft; |
||
1073 | #define MAXCMDTEXT 200 |
||
1074 | |||
1075 | char * |
||
1076 | commandtext(n) |
||
1077 | union node *n; |
||
1078 | { |
||
1079 | char *name; |
||
1080 | |||
1081 | cmdnextc = name = ckmalloc(MAXCMDTEXT); |
||
1082 | cmdnleft = MAXCMDTEXT - 4; |
||
1083 | cmdtxt(n); |
||
1084 | *cmdnextc = '\0'; |
||
1085 | return name; |
||
1086 | } |
||
1087 | |||
1088 | |||
1089 | STATIC void |
||
1090 | cmdtxt(n) |
||
1091 | union node *n; |
||
1092 | { |
||
1093 | union node *np; |
||
1094 | struct nodelist *lp; |
||
1095 | const char *p; |
||
1096 | int i; |
||
1097 | char s[2]; |
||
1098 | |||
1099 | if (n == NULL) |
||
1100 | return; |
||
1101 | switch (n->type) { |
||
1102 | case NSEMI: |
||
1103 | cmdtxt(n->nbinary.ch1); |
||
1104 | cmdputs("; "); |
||
1105 | cmdtxt(n->nbinary.ch2); |
||
1106 | break; |
||
1107 | case NAND: |
||
1108 | cmdtxt(n->nbinary.ch1); |
||
1109 | cmdputs(" && "); |
||
1110 | cmdtxt(n->nbinary.ch2); |
||
1111 | break; |
||
1112 | case NOR: |
||
1113 | cmdtxt(n->nbinary.ch1); |
||
1114 | cmdputs(" || "); |
||
1115 | cmdtxt(n->nbinary.ch2); |
||
1116 | break; |
||
1117 | case NPIPE: |
||
1118 | for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { |
||
1119 | cmdtxt(lp->n); |
||
1120 | if (lp->next) |
||
1121 | cmdputs(" | "); |
||
1122 | } |
||
1123 | break; |
||
1124 | case NSUBSHELL: |
||
1125 | cmdputs("("); |
||
1126 | cmdtxt(n->nredir.n); |
||
1127 | cmdputs(")"); |
||
1128 | break; |
||
1129 | case NREDIR: |
||
1130 | case NBACKGND: |
||
1131 | cmdtxt(n->nredir.n); |
||
1132 | break; |
||
1133 | case NIF: |
||
1134 | cmdputs("if "); |
||
1135 | cmdtxt(n->nif.test); |
||
1136 | cmdputs("; then "); |
||
1137 | cmdtxt(n->nif.ifpart); |
||
1138 | cmdputs("..."); |
||
1139 | break; |
||
1140 | case NWHILE: |
||
1141 | cmdputs("while "); |
||
1142 | goto until; |
||
1143 | case NUNTIL: |
||
1144 | cmdputs("until "); |
||
1145 | until: |
||
1146 | cmdtxt(n->nbinary.ch1); |
||
1147 | cmdputs("; do "); |
||
1148 | cmdtxt(n->nbinary.ch2); |
||
1149 | cmdputs("; done"); |
||
1150 | break; |
||
1151 | case NFOR: |
||
1152 | cmdputs("for "); |
||
1153 | cmdputs(n->nfor.var); |
||
1154 | cmdputs(" in ..."); |
||
1155 | break; |
||
1156 | case NCASE: |
||
1157 | cmdputs("case "); |
||
1158 | cmdputs(n->ncase.expr->narg.text); |
||
1159 | cmdputs(" in ..."); |
||
1160 | break; |
||
1161 | case NDEFUN: |
||
1162 | cmdputs(n->narg.text); |
||
1163 | cmdputs("() ..."); |
||
1164 | break; |
||
1165 | case NCMD: |
||
1166 | for (np = n->ncmd.args ; np ; np = np->narg.next) { |
||
1167 | cmdtxt(np); |
||
1168 | if (np->narg.next) |
||
1169 | cmdputs(" "); |
||
1170 | } |
||
1171 | for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { |
||
1172 | cmdputs(" "); |
||
1173 | cmdtxt(np); |
||
1174 | } |
||
1175 | break; |
||
1176 | case NARG: |
||
1177 | cmdputs(n->narg.text); |
||
1178 | break; |
||
1179 | case NTO: |
||
1180 | p = ">"; i = 1; goto redir; |
||
1181 | case NAPPEND: |
||
1182 | p = ">>"; i = 1; goto redir; |
||
1183 | case NTOFD: |
||
1184 | p = ">&"; i = 1; goto redir; |
||
1185 | case NTOOV: |
||
1186 | p = ">|"; i = 1; goto redir; |
||
1187 | case NFROM: |
||
1188 | p = "<"; i = 0; goto redir; |
||
1189 | case NFROMFD: |
||
1190 | p = "<&"; i = 0; goto redir; |
||
1191 | case NFROMTO: |
||
1192 | p = "<>"; i = 0; goto redir; |
||
1193 | redir: |
||
1194 | if (n->nfile.fd != i) { |
||
1195 | s[0] = n->nfile.fd + '0'; |
||
1196 | s[1] = '\0'; |
||
1197 | cmdputs(s); |
||
1198 | } |
||
1199 | cmdputs(p); |
||
1200 | if (n->type == NTOFD || n->type == NFROMFD) { |
||
1201 | s[0] = n->ndup.dupfd + '0'; |
||
1202 | s[1] = '\0'; |
||
1203 | cmdputs(s); |
||
1204 | } else { |
||
1205 | cmdtxt(n->nfile.fname); |
||
1206 | } |
||
1207 | break; |
||
1208 | case NHERE: |
||
1209 | case NXHERE: |
||
1210 | cmdputs("<<..."); |
||
1211 | break; |
||
1212 | default: |
||
1213 | cmdputs("???"); |
||
1214 | break; |
||
1215 | } |
||
1216 | } |
||
1217 | |||
1218 | |||
1219 | |||
1220 | STATIC void |
||
1221 | cmdputs(s) |
||
1222 | const char *s; |
||
1223 | { |
||
1224 | const char *p; |
||
1225 | char *q; |
||
1226 | char c; |
||
1227 | int subtype = 0; |
||
1228 | |||
1229 | if (cmdnleft <= 0) |
||
1230 | return; |
||
1231 | p = s; |
||
1232 | q = cmdnextc; |
||
1233 | while ((c = *p++) != '\0') { |
||
1234 | if (c == CTLESC) |
||
1235 | *q++ = *p++; |
||
1236 | else if (c == CTLVAR) { |
||
1237 | *q++ = '$'; |
||
1238 | if (--cmdnleft > 0) |
||
1239 | *q++ = '{'; |
||
1240 | subtype = *p++; |
||
1241 | } else if (c == '=' && subtype != 0) { |
||
1242 | *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; |
||
1243 | subtype = 0; |
||
1244 | } else if (c == CTLENDVAR) { |
||
1245 | *q++ = '}'; |
||
1246 | } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) |
||
1247 | cmdnleft++; /* ignore it */ |
||
1248 | else |
||
1249 | *q++ = c; |
||
1250 | if (--cmdnleft <= 0) { |
||
1251 | *q++ = '.'; |
||
1252 | *q++ = '.'; |
||
1253 | *q++ = '.'; |
||
1254 | break; |
||
1255 | } |
||
1256 | } |
||
1257 | cmdnextc = q; |
||
1258 | } |
||
1259 | |||
1260 | STATIC void waitonint(int sig) { |
||
1261 | intreceived = 1; |
||
1262 | return; |
||
1263 | } |