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2714 | cejka | 1 | /* $NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt 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[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; |
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43 | #else |
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44 | __RCSID("$NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt Exp $"); |
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45 | #endif |
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46 | #endif /* not lint */ |
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47 | |||
48 | /* |
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49 | * Errors and exceptions. |
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50 | */ |
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51 | |||
52 | #include <signal.h> |
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53 | #include <stdlib.h> |
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54 | #include <unistd.h> |
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55 | #include <errno.h> |
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56 | |||
57 | #include "shell.h" |
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58 | #include "main.h" |
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59 | #include "options.h" |
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60 | #include "output.h" |
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61 | #include "error.h" |
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62 | #include "show.h" |
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63 | |||
64 | |||
65 | /* |
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66 | * Code to handle exceptions in C. |
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67 | */ |
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68 | |||
69 | struct jmploc *handler; |
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70 | int exception; |
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71 | volatile int suppressint; |
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72 | volatile int intpending; |
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73 | char *commandname; |
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74 | |||
75 | |||
76 | static void exverror (int, const char *, va_list) |
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77 | __attribute__((__noreturn__)); |
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78 | |||
79 | /* |
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80 | * Called to raise an exception. Since C doesn't include exceptions, we |
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81 | * just do a longjmp to the exception handler. The type of exception is |
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82 | * stored in the global variable "exception". |
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83 | */ |
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84 | |||
85 | void |
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86 | exraise(e) |
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87 | int e; |
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88 | { |
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89 | if (handler == NULL) |
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90 | abort(); |
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91 | exception = e; |
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92 | longjmp(handler->loc, 1); |
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93 | } |
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94 | |||
95 | |||
96 | /* |
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97 | * Called from trap.c when a SIGINT is received. (If the user specifies |
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98 | * that SIGINT is to be trapped or ignored using the trap builtin, then |
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99 | * this routine is not called.) Suppressint is nonzero when interrupts |
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100 | * are held using the INTOFF macro. The call to _exit is necessary because |
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101 | * there is a short period after a fork before the signal handlers are |
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102 | * set to the appropriate value for the child. (The test for iflag is |
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103 | * just defensive programming.) |
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104 | */ |
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105 | |||
106 | void |
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107 | onint() { |
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108 | sigset_t sigset; |
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109 | |||
110 | if (suppressint) { |
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111 | intpending++; |
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112 | return; |
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113 | } |
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114 | intpending = 0; |
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115 | sigemptyset(&sigset); |
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116 | sigprocmask(SIG_SETMASK, &sigset, NULL); |
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117 | if (rootshell && iflag) |
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118 | exraise(EXINT); |
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119 | else { |
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120 | signal(SIGINT, SIG_DFL); |
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121 | raise(SIGINT); |
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122 | } |
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123 | /* NOTREACHED */ |
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124 | } |
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125 | |||
126 | |||
127 | /* |
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128 | * Exverror is called to raise the error exception. If the first argument |
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129 | * is not NULL then error prints an error message using printf style |
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130 | * formatting. It then raises the error exception. |
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131 | */ |
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132 | static void |
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133 | exverror(cond, msg, ap) |
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134 | int cond; |
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135 | const char *msg; |
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136 | va_list ap; |
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137 | { |
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138 | CLEAR_PENDING_INT; |
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139 | INTOFF; |
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140 | |||
141 | #ifdef DEBUG |
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142 | if (msg) |
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143 | TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); |
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144 | else |
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145 | TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); |
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146 | #endif |
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147 | if (msg) { |
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148 | if (commandname) |
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149 | outfmt(&errout, "%s: ", commandname); |
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150 | doformat(&errout, msg, ap); |
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151 | out2c('\n'); |
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152 | } |
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153 | flushall(); |
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154 | exraise(cond); |
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155 | /* NOTREACHED */ |
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156 | } |
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157 | |||
158 | |||
159 | #ifdef __STDC__ |
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160 | void |
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161 | error(const char *msg, ...) |
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162 | #else |
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163 | void |
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164 | error(va_alist) |
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165 | va_dcl |
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166 | #endif |
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167 | { |
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168 | #ifndef __STDC__ |
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169 | const char *msg; |
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170 | #endif |
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171 | va_list ap; |
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172 | #ifdef __STDC__ |
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173 | va_start(ap, msg); |
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174 | #else |
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175 | va_start(ap); |
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176 | msg = va_arg(ap, const char *); |
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177 | #endif |
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178 | exverror(EXERROR, msg, ap); |
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179 | /* NOTREACHED */ |
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180 | va_end(ap); |
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181 | } |
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182 | |||
183 | |||
184 | #ifdef __STDC__ |
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185 | void |
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186 | exerror(int cond, const char *msg, ...) |
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187 | #else |
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188 | void |
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189 | exerror(va_alist) |
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190 | va_dcl |
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191 | #endif |
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192 | { |
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193 | #ifndef __STDC__ |
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194 | int cond; |
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195 | const char *msg; |
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196 | #endif |
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197 | va_list ap; |
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198 | #ifdef __STDC__ |
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199 | va_start(ap, msg); |
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200 | #else |
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201 | va_start(ap); |
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202 | cond = va_arg(ap, int); |
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203 | msg = va_arg(ap, const char *); |
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204 | #endif |
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205 | exverror(cond, msg, ap); |
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206 | /* NOTREACHED */ |
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207 | va_end(ap); |
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208 | } |
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209 | |||
210 | |||
211 | |||
212 | /* |
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213 | * Table of error messages. |
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214 | */ |
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215 | |||
216 | struct errname { |
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217 | short errcode; /* error number */ |
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218 | short action; /* operation which encountered the error */ |
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219 | const char *msg; /* text describing the error */ |
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220 | }; |
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221 | |||
222 | |||
223 | #define ALL (E_OPEN|E_CREAT|E_EXEC) |
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224 | |||
225 | STATIC const struct errname errormsg[] = { |
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226 | { EINTR, ALL, "interrupted" }, |
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227 | { EACCES, ALL, "permission denied" }, |
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228 | { EIO, ALL, "I/O error" }, |
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229 | { ENOENT, E_OPEN, "no such file" }, |
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230 | { ENOENT, E_CREAT,"directory nonexistent" }, |
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231 | { ENOENT, E_EXEC, "not found" }, |
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232 | { ENOTDIR, E_OPEN, "no such file" }, |
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233 | { ENOTDIR, E_CREAT,"directory nonexistent" }, |
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234 | { ENOTDIR, E_EXEC, "not found" }, |
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235 | { EISDIR, ALL, "is a directory" }, |
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236 | { EEXIST, E_CREAT,"file exists" }, |
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237 | #ifdef notdef |
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238 | { EMFILE, ALL, "too many open files" }, |
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239 | #endif |
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240 | { ENFILE, ALL, "file table overflow" }, |
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241 | { ENOSPC, ALL, "file system full" }, |
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242 | #ifdef EDQUOT |
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243 | { EDQUOT, ALL, "disk quota exceeded" }, |
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244 | #endif |
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245 | #ifdef ENOSR |
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246 | { ENOSR, ALL, "no streams resources" }, |
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247 | #endif |
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248 | { ENXIO, ALL, "no such device or address" }, |
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249 | { EROFS, ALL, "read-only file system" }, |
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250 | { ETXTBSY, ALL, "text busy" }, |
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251 | #ifdef SYSV |
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252 | { EAGAIN, E_EXEC, "not enough memory" }, |
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253 | #endif |
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254 | { ENOMEM, ALL, "not enough memory" }, |
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255 | #ifdef ENOLINK |
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256 | { ENOLINK, ALL, "remote access failed" }, |
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257 | #endif |
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258 | #ifdef EMULTIHOP |
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259 | { EMULTIHOP, ALL, "remote access failed" }, |
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260 | #endif |
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261 | #ifdef ECOMM |
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262 | { ECOMM, ALL, "remote access failed" }, |
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263 | #endif |
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264 | #ifdef ESTALE |
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265 | { ESTALE, ALL, "remote access failed" }, |
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266 | #endif |
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267 | #ifdef ETIMEDOUT |
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268 | { ETIMEDOUT, ALL, "remote access failed" }, |
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269 | #endif |
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270 | #ifdef ELOOP |
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271 | { ELOOP, ALL, "symbolic link loop" }, |
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272 | #endif |
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273 | { E2BIG, E_EXEC, "argument list too long" }, |
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274 | #ifdef ELIBACC |
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275 | { ELIBACC, E_EXEC, "shared library missing" }, |
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276 | #endif |
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277 | { 0, 0, NULL }, |
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278 | }; |
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279 | |||
280 | |||
281 | /* |
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282 | * Return a string describing an error. The returned string may be a |
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283 | * pointer to a static buffer that will be overwritten on the next call. |
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284 | * Action describes the operation that got the error. |
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285 | */ |
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286 | |||
287 | const char * |
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288 | errmsg(e, action) |
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289 | int e; |
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290 | int action; |
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291 | { |
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292 | struct errname const *ep; |
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293 | static char buf[12]; |
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294 | |||
295 | for (ep = errormsg ; ep->errcode ; ep++) { |
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296 | if (ep->errcode == e && (ep->action & action) != 0) |
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297 | return ep->msg; |
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298 | } |
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299 | fmtstr(buf, sizeof buf, "error %d", e); |
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300 | return buf; |
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301 | } |