error.c revision 1.22
1 /* $NetBSD: error.c,v 1.22 1999/07/09 03:05:49 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 43 #else 44 __RCSID("$NetBSD: error.c,v 1.22 1999/07/09 03:05:49 christos Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 /* 49 * Errors and exceptions. 50 */ 51 52 #include <signal.h> 53 #include <unistd.h> 54 #include <errno.h> 55 56 #include "shell.h" 57 #include "main.h" 58 #include "options.h" 59 #include "output.h" 60 #include "error.h" 61 #include "show.h" 62 63 64 /* 65 * Code to handle exceptions in C. 66 */ 67 68 struct jmploc *handler; 69 int exception; 70 volatile int suppressint; 71 volatile int intpending; 72 char *commandname; 73 74 75 static void exverror __P((int, const char *, va_list)) 76 __attribute__((__noreturn__)); 77 78 /* 79 * Called to raise an exception. Since C doesn't include exceptions, we 80 * just do a longjmp to the exception handler. The type of exception is 81 * stored in the global variable "exception". 82 */ 83 84 void 85 exraise(e) 86 int e; 87 { 88 if (handler == NULL) 89 abort(); 90 exception = e; 91 longjmp(handler->loc, 1); 92 } 93 94 95 /* 96 * Called from trap.c when a SIGINT is received. (If the user specifies 97 * that SIGINT is to be trapped or ignored using the trap builtin, then 98 * this routine is not called.) Suppressint is nonzero when interrupts 99 * are held using the INTOFF macro. The call to _exit is necessary because 100 * there is a short period after a fork before the signal handlers are 101 * set to the appropriate value for the child. (The test for iflag is 102 * just defensive programming.) 103 */ 104 105 void 106 onint() { 107 sigset_t sigset; 108 109 if (suppressint) { 110 intpending++; 111 return; 112 } 113 intpending = 0; 114 sigemptyset(&sigset); 115 sigprocmask(SIG_SETMASK, &sigset, NULL); 116 if (rootshell && iflag) 117 exraise(EXINT); 118 else { 119 signal(SIGINT, SIG_DFL); 120 raise(SIGINT); 121 } 122 /* NOTREACHED */ 123 } 124 125 126 /* 127 * Exverror is called to raise the error exception. If the first argument 128 * is not NULL then error prints an error message using printf style 129 * formatting. It then raises the error exception. 130 */ 131 static void 132 exverror(cond, msg, ap) 133 int cond; 134 const char *msg; 135 va_list ap; 136 { 137 CLEAR_PENDING_INT; 138 INTOFF; 139 140 #ifdef DEBUG 141 if (msg) 142 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 143 else 144 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 145 #endif 146 if (msg) { 147 if (commandname) 148 outfmt(&errout, "%s: ", commandname); 149 doformat(&errout, msg, ap); 150 out2c('\n'); 151 } 152 flushall(); 153 exraise(cond); 154 /* NOTREACHED */ 155 } 156 157 158 #ifdef __STDC__ 159 void 160 error(const char *msg, ...) 161 #else 162 void 163 error(va_alist) 164 va_dcl 165 #endif 166 { 167 #ifndef __STDC__ 168 const char *msg; 169 #endif 170 va_list ap; 171 #ifdef __STDC__ 172 va_start(ap, msg); 173 #else 174 va_start(ap); 175 msg = va_arg(ap, const char *); 176 #endif 177 exverror(EXERROR, msg, ap); 178 /* NOTREACHED */ 179 va_end(ap); 180 } 181 182 183 #ifdef __STDC__ 184 void 185 exerror(int cond, const char *msg, ...) 186 #else 187 void 188 exerror(va_alist) 189 va_dcl 190 #endif 191 { 192 #ifndef __STDC__ 193 int cond; 194 const char *msg; 195 #endif 196 va_list ap; 197 #ifdef __STDC__ 198 va_start(ap, msg); 199 #else 200 va_start(ap); 201 cond = va_arg(ap, int); 202 msg = va_arg(ap, const char *); 203 #endif 204 exverror(cond, msg, ap); 205 /* NOTREACHED */ 206 va_end(ap); 207 } 208 209 210 211 /* 212 * Table of error messages. 213 */ 214 215 struct errname { 216 short errcode; /* error number */ 217 short action; /* operation which encountered the error */ 218 const char *msg; /* text describing the error */ 219 }; 220 221 222 #define ALL (E_OPEN|E_CREAT|E_EXEC) 223 224 STATIC const struct errname errormsg[] = { 225 { EINTR, ALL, "interrupted" }, 226 { EACCES, ALL, "permission denied" }, 227 { EIO, ALL, "I/O error" }, 228 { ENOENT, E_OPEN, "no such file" }, 229 { ENOENT, E_CREAT,"directory nonexistent" }, 230 { ENOENT, E_EXEC, "not found" }, 231 { ENOTDIR, E_OPEN, "no such file" }, 232 { ENOTDIR, E_CREAT,"directory nonexistent" }, 233 { ENOTDIR, E_EXEC, "not found" }, 234 { EISDIR, ALL, "is a directory" }, 235 #ifdef notdef 236 { EMFILE, ALL, "too many open files" }, 237 #endif 238 { ENFILE, ALL, "file table overflow" }, 239 { ENOSPC, ALL, "file system full" }, 240 #ifdef EDQUOT 241 { EDQUOT, ALL, "disk quota exceeded" }, 242 #endif 243 #ifdef ENOSR 244 { ENOSR, ALL, "no streams resources" }, 245 #endif 246 { ENXIO, ALL, "no such device or address" }, 247 { EROFS, ALL, "read-only file system" }, 248 { ETXTBSY, ALL, "text busy" }, 249 #ifdef SYSV 250 { EAGAIN, E_EXEC, "not enough memory" }, 251 #endif 252 { ENOMEM, ALL, "not enough memory" }, 253 #ifdef ENOLINK 254 { ENOLINK, ALL, "remote access failed" }, 255 #endif 256 #ifdef EMULTIHOP 257 { EMULTIHOP, ALL, "remote access failed" }, 258 #endif 259 #ifdef ECOMM 260 { ECOMM, ALL, "remote access failed" }, 261 #endif 262 #ifdef ESTALE 263 { ESTALE, ALL, "remote access failed" }, 264 #endif 265 #ifdef ETIMEDOUT 266 { ETIMEDOUT, ALL, "remote access failed" }, 267 #endif 268 #ifdef ELOOP 269 { ELOOP, ALL, "symbolic link loop" }, 270 #endif 271 { E2BIG, E_EXEC, "argument list too long" }, 272 #ifdef ELIBACC 273 { ELIBACC, E_EXEC, "shared library missing" }, 274 #endif 275 { 0, 0, NULL }, 276 }; 277 278 279 /* 280 * Return a string describing an error. The returned string may be a 281 * pointer to a static buffer that will be overwritten on the next call. 282 * Action describes the operation that got the error. 283 */ 284 285 const char * 286 errmsg(e, action) 287 int e; 288 int action; 289 { 290 struct errname const *ep; 291 static char buf[12]; 292 293 for (ep = errormsg ; ep->errcode ; ep++) { 294 if (ep->errcode == e && (ep->action & action) != 0) 295 return ep->msg; 296 } 297 fmtstr(buf, sizeof buf, "error %d", e); 298 return buf; 299 } 300
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