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2714 | cejka | 1 | /* $NetBSD: main.c,v 1.39 2000/11/01 19:56:01 christos 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 | __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\ |
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42 | The Regents of the University of California. All rights reserved.\n"); |
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43 | #endif /* not lint */ |
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44 | |||
45 | #ifndef lint |
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46 | #if 0 |
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47 | static char sccsid[] = "@(#)main.c 8.7 (Berkeley) 7/19/95"; |
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48 | #else |
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49 | __RCSID("$NetBSD: main.c,v 1.39 2000/11/01 19:56:01 christos Exp $"); |
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50 | #endif |
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51 | #endif /* not lint */ |
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52 | |||
53 | #include <errno.h> |
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54 | #include <stdio.h> |
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55 | #include <signal.h> |
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56 | #include <sys/stat.h> |
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57 | #include <unistd.h> |
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58 | #include <fcntl.h> |
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59 | |||
60 | |||
61 | #include "shell.h" |
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62 | #include "main.h" |
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63 | #include "mail.h" |
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64 | #include "options.h" |
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65 | #include "output.h" |
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66 | #include "parser.h" |
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67 | #include "nodes.h" |
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68 | #include "expand.h" |
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69 | #include "eval.h" |
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70 | #include "jobs.h" |
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71 | #include "input.h" |
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72 | #include "trap.h" |
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73 | #include "var.h" |
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74 | #include "show.h" |
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75 | #include "memalloc.h" |
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76 | #include "error.h" |
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77 | #include "init.h" |
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78 | #include "mystring.h" |
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79 | #include "exec.h" |
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80 | #include "cd.h" |
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81 | |||
82 | #ifdef HETIO |
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83 | #include "hetio.h" |
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84 | #endif |
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85 | |||
86 | #define PROFILE 0 |
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87 | |||
88 | int rootpid; |
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89 | int rootshell; |
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90 | STATIC union node *curcmd; |
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91 | STATIC union node *prevcmd; |
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92 | #if PROFILE |
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93 | short profile_buf[16384]; |
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94 | extern int etext(); |
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95 | #endif |
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96 | |||
97 | STATIC void read_profile (const char *); |
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98 | STATIC char *find_dot_file (char *); |
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99 | int main (int, char **); |
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100 | |||
101 | /* |
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102 | * Main routine. We initialize things, parse the arguments, execute |
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103 | * profiles if we're a login shell, and then call cmdloop to execute |
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104 | * commands. The setjmp call sets up the location to jump to when an |
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105 | * exception occurs. When an exception occurs the variable "state" |
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106 | * is used to figure out how far we had gotten. |
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107 | */ |
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108 | |||
109 | int |
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110 | main(argc, argv) |
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111 | int argc; |
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112 | char **argv; |
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113 | { |
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114 | struct jmploc jmploc; |
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115 | struct stackmark smark; |
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116 | volatile int state; |
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117 | char *shinit; |
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118 | int priviliged; |
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119 | |||
120 | priviliged = getuid() != geteuid() || getgid() != getegid(); |
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121 | |||
122 | #if PROFILE |
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123 | monitor(4, etext, profile_buf, sizeof profile_buf, 50); |
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124 | #endif |
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125 | #if defined(linux) || defined(__GNU__) |
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126 | signal(SIGCHLD, SIG_DFL); |
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127 | #endif |
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128 | state = 0; |
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129 | if (setjmp(jmploc.loc)) { |
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130 | /* |
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131 | * When a shell procedure is executed, we raise the |
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132 | * exception EXSHELLPROC to clean up before executing |
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133 | * the shell procedure. |
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134 | */ |
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135 | switch (exception) { |
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136 | case EXSHELLPROC: |
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137 | rootpid = getpid(); |
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138 | rootshell = 1; |
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139 | minusc = NULL; |
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140 | state = 3; |
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141 | break; |
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142 | |||
143 | case EXEXEC: |
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144 | exitstatus = exerrno; |
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145 | break; |
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146 | |||
147 | case EXERROR: |
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148 | exitstatus = 2; |
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149 | break; |
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150 | |||
151 | default: |
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152 | break; |
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153 | } |
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154 | |||
155 | if (exception != EXSHELLPROC) { |
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156 | if (state == 0 || iflag == 0 || ! rootshell) |
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157 | exitshell(exitstatus); |
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158 | } |
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159 | reset(); |
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160 | if (exception == EXINT |
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161 | #if ATTY |
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162 | && (! attyset() || equal(termval(), "emacs")) |
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163 | #endif |
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164 | ) { |
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165 | out2c('\n'); |
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166 | flushout(&errout); |
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167 | } |
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168 | popstackmark(&smark); |
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169 | FORCEINTON; /* enable interrupts */ |
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170 | if (state == 1) |
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171 | goto state1; |
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172 | else if (state == 2) |
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173 | goto state2; |
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174 | else if (state == 3) |
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175 | goto state3; |
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176 | else |
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177 | goto state4; |
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178 | } |
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179 | handler = &jmploc; |
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180 | #ifdef DEBUG |
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181 | opentrace(); |
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182 | trputs("Shell args: "); trargs(argv); |
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183 | #endif |
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184 | rootpid = getpid(); |
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185 | rootshell = 1; |
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186 | init(); |
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187 | setstackmark(&smark); |
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188 | procargs(argc, argv); |
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189 | if (argv[0] && argv[0][0] == '-') { |
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190 | state = 1; |
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191 | read_profile("/etc/profile"); |
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192 | state1: |
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193 | state = 2; |
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194 | if (priviliged == 0) |
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195 | read_profile(".profile"); |
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196 | else |
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197 | read_profile("/etc/suid_profile"); |
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198 | } |
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199 | state2: |
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200 | state = 3; |
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201 | if (iflag && !priviliged) { |
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202 | if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { |
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203 | state = 3; |
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204 | read_profile(shinit); |
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205 | } |
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206 | } |
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207 | state3: |
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208 | state = 4; |
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209 | if (sflag == 0 || minusc) { |
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210 | static int sigs[] = { |
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211 | SIGINT, SIGQUIT, SIGHUP, |
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212 | #ifdef SIGTSTP |
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213 | SIGTSTP, |
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214 | #endif |
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215 | SIGPIPE |
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216 | }; |
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217 | #define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0])) |
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218 | int i; |
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219 | |||
220 | for (i = 0; i < SIGSSIZE; i++) |
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221 | setsignal(sigs[i]); |
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222 | } |
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223 | |||
224 | if (minusc) |
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225 | evalstring(minusc, 0); |
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226 | |||
227 | if (sflag || minusc == NULL) { |
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228 | state4: /* XXX ??? - why isn't this before the "if" statement */ |
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229 | cmdloop(1); |
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230 | } |
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231 | #if PROFILE |
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232 | monitor(0); |
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233 | #endif |
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234 | exitshell(exitstatus); |
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235 | /* NOTREACHED */ |
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236 | } |
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237 | |||
238 | |||
239 | /* |
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240 | * Read and execute commands. "Top" is nonzero for the top level command |
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241 | * loop; it turns on prompting if the shell is interactive. |
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242 | */ |
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243 | |||
244 | void |
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245 | cmdloop(top) |
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246 | int top; |
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247 | { |
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248 | union node *n; |
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249 | struct stackmark smark; |
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250 | int inter; |
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251 | int numeof = 0; |
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252 | |||
253 | TRACE(("cmdloop(%d) called\n", top)); |
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254 | setstackmark(&smark); |
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255 | #ifdef HETIO |
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256 | if(iflag && top) |
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257 | hetio_init(); |
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258 | #endif |
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259 | for (;;) { |
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260 | if (pendingsigs) |
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261 | dotrap(); |
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262 | inter = 0; |
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263 | if (iflag && top) { |
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264 | inter++; |
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265 | showjobs(1); |
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266 | chkmail(0); |
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267 | flushout(&output); |
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268 | } |
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269 | n = parsecmd(inter); |
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270 | /* showtree(n); DEBUG */ |
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271 | if (n == NEOF) { |
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272 | if (!top || numeof >= 50) |
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273 | break; |
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274 | if (!stoppedjobs()) { |
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275 | if (!Iflag) |
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276 | break; |
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277 | out2str("\nUse \"exit\" to leave shell.\n"); |
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278 | } |
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279 | numeof++; |
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280 | } else if (n != NULL && nflag == 0) { |
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281 | job_warning = (job_warning == 2) ? 1 : 0; |
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282 | numeof = 0; |
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283 | evaltree(n, 0); |
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284 | } |
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285 | popstackmark(&smark); |
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286 | setstackmark(&smark); |
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287 | if (evalskip == SKIPFILE) { |
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288 | evalskip = 0; |
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289 | break; |
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290 | } |
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291 | } |
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292 | popstackmark(&smark); |
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293 | } |
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294 | |||
295 | |||
296 | |||
297 | /* |
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298 | * Read /etc/profile or .profile. Return on error. |
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299 | */ |
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300 | |||
301 | STATIC void |
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302 | read_profile(name) |
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303 | const char *name; |
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304 | { |
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305 | int fd; |
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306 | int xflag_set = 0; |
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307 | int vflag_set = 0; |
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308 | |||
309 | INTOFF; |
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310 | if ((fd = open(name, O_RDONLY)) >= 0) |
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311 | setinputfd(fd, 1); |
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312 | INTON; |
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313 | if (fd < 0) |
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314 | return; |
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315 | /* -q turns off -x and -v just when executing init files */ |
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316 | if (qflag) { |
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317 | if (xflag) |
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318 | xflag = 0, xflag_set = 1; |
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319 | if (vflag) |
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320 | vflag = 0, vflag_set = 1; |
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321 | } |
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322 | cmdloop(0); |
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323 | if (qflag) { |
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324 | if (xflag_set) |
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325 | xflag = 1; |
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326 | if (vflag_set) |
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327 | vflag = 1; |
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328 | } |
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329 | popfile(); |
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330 | } |
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331 | |||
332 | |||
333 | |||
334 | /* |
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335 | * Read a file containing shell functions. |
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336 | */ |
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337 | |||
338 | void |
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339 | readcmdfile(name) |
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340 | char *name; |
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341 | { |
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342 | int fd; |
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343 | |||
344 | INTOFF; |
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345 | if ((fd = open(name, O_RDONLY)) >= 0) |
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346 | setinputfd(fd, 1); |
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347 | else |
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348 | error("Can't open %s", name); |
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349 | INTON; |
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350 | cmdloop(0); |
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351 | popfile(); |
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352 | } |
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353 | |||
354 | |||
355 | |||
356 | /* |
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357 | * Take commands from a file. To be compatable we should do a path |
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358 | * search for the file, which is necessary to find sub-commands. |
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359 | */ |
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360 | |||
361 | |||
362 | STATIC char * |
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363 | find_dot_file(basename) |
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364 | char *basename; |
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365 | { |
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366 | char *fullname; |
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367 | const char *path = pathval(); |
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368 | struct stat statb; |
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369 | |||
370 | /* don't try this for absolute or relative paths */ |
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371 | if (strchr(basename, '/')) |
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372 | return basename; |
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373 | |||
374 | while ((fullname = padvance(&path, basename)) != NULL) { |
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375 | if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { |
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376 | /* |
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377 | * Don't bother freeing here, since it will |
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378 | * be freed by the caller. |
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379 | */ |
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380 | return fullname; |
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381 | } |
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382 | stunalloc(fullname); |
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383 | } |
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384 | |||
385 | /* not found in the PATH */ |
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386 | error("%s: not found", basename); |
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387 | /* NOTREACHED */ |
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388 | } |
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389 | |||
390 | int |
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391 | dotcmd(argc, argv) |
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392 | int argc; |
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393 | char **argv; |
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394 | { |
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395 | struct strlist *sp; |
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396 | exitstatus = 0; |
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397 | |||
398 | for (sp = cmdenviron; sp ; sp = sp->next) |
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399 | setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); |
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400 | |||
401 | if (argc >= 2) { /* That's what SVR2 does */ |
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402 | char *fullname; |
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403 | struct stackmark smark; |
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404 | |||
405 | setstackmark(&smark); |
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406 | fullname = find_dot_file(argv[1]); |
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407 | setinputfile(fullname, 1); |
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408 | commandname = fullname; |
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409 | cmdloop(0); |
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410 | popfile(); |
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411 | popstackmark(&smark); |
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412 | } |
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413 | return exitstatus; |
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414 | } |
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415 | |||
416 | |||
417 | int |
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418 | exitcmd(argc, argv) |
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419 | int argc; |
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420 | char **argv; |
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421 | { |
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422 | extern int oexitstatus; |
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423 | |||
424 | if (stoppedjobs()) |
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425 | return 0; |
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426 | if (argc > 1) |
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427 | exitstatus = number(argv[1]); |
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428 | else |
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429 | exitstatus = oexitstatus; |
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430 | exitshell(exitstatus); |
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431 | /* NOTREACHED */ |
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432 | } |