1 /* $NetBSD: error.c,v 1.37 2008/10/16 14:36:40 dholland 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 39 #else 40 __RCSID("$NetBSD: error.c,v 1.37 2008/10/16 14:36:40 dholland Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 /* 45 * Errors and exceptions. 46 */ 47 48 #include <signal.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 #include <errno.h> 52 #include <stdio.h> 53 #include <string.h> 54 55 #include "shell.h" 56 #include "eval.h" /* for commandname */ 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 73 74 static void exverror(int, const char *, va_list) __dead; 75 76 /* 77 * Called to raise an exception. Since C doesn't include exceptions, we 78 * just do a longjmp to the exception handler. The type of exception is 79 * stored in the global variable "exception". 80 */ 81 82 void 83 exraise(int e) 84 { 85 if (handler == NULL) 86 abort(); 87 exception = e; 88 longjmp(handler->loc, 1); 89 } 90 91 92 /* 93 * Called from trap.c when a SIGINT is received. (If the user specifies 94 * that SIGINT is to be trapped or ignored using the trap builtin, then 95 * this routine is not called.) Suppressint is nonzero when interrupts 96 * are held using the INTOFF macro. The call to _exit is necessary because 97 * there is a short period after a fork before the signal handlers are 98 * set to the appropriate value for the child. (The test for iflag is 99 * just defensive programming.) 100 */ 101 102 void 103 onint(void) 104 { 105 sigset_t nsigset; 106 107 if (suppressint) { 108 intpending = 1; 109 return; 110 } 111 intpending = 0; 112 sigemptyset(&nsigset); 113 sigprocmask(SIG_SETMASK, &nsigset, NULL); 114 if (rootshell && iflag) 115 exraise(EXINT); 116 else { 117 signal(SIGINT, SIG_DFL); 118 raise(SIGINT); 119 } 120 /* NOTREACHED */ 121 } 122 123 static void 124 exvwarning(int sv_errno, const char *msg, va_list ap) 125 { 126 /* Partially emulate line buffered output so that: 127 * printf '%d\n' 1 a 2 128 * and 129 * printf '%d %d %d\n' 1 a 2 130 * both generate sensible text when stdout and stderr are merged. 131 */ 132 if (output.nextc != output.buf && output.nextc[-1] == '\n') 133 flushout(&output); 134 if (commandname) 135 outfmt(&errout, "%s: ", commandname); 136 else 137 outfmt(&errout, "%s: ", getprogname()); 138 if (msg != NULL) { 139 doformat(&errout, msg, ap); 140 if (sv_errno >= 0) 141 outfmt(&errout, ": "); 142 } 143 if (sv_errno >= 0) 144 outfmt(&errout, "%s", strerror(sv_errno)); 145 out2c('\n'); 146 flushout(&errout); 147 } 148 149 /* 150 * Exverror is called to raise the error exception. If the second argument 151 * is not NULL then error prints an error message using printf style 152 * formatting. It then raises the error exception. 153 */ 154 static void 155 exverror(int cond, const char *msg, va_list ap) 156 { 157 CLEAR_PENDING_INT; 158 INTOFF; 159 160 #ifdef DEBUG 161 if (msg) { 162 TRACE(("exverror(%d, \"", cond)); 163 TRACEV((msg, ap)); 164 TRACE(("\") pid=%d\n", getpid())); 165 } else 166 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 167 #endif 168 if (msg) 169 exvwarning(-1, msg, ap); 170 171 flushall(); 172 exraise(cond); 173 /* NOTREACHED */ 174 } 175 176 177 void 178 error(const char *msg, ...) 179 { 180 va_list ap; 181 182 va_start(ap, msg); 183 exverror(EXERROR, msg, ap); 184 /* NOTREACHED */ 185 va_end(ap); 186 } 187 188 189 void 190 exerror(int cond, const char *msg, ...) 191 { 192 va_list ap; 193 194 va_start(ap, msg); 195 exverror(cond, msg, ap); 196 /* NOTREACHED */ 197 va_end(ap); 198 } 199 200 /* 201 * error/warning routines for external builtins 202 */ 203 204 void 205 sh_exit(int rval) 206 { 207 exerrno = rval & 255; 208 exraise(EXEXEC); 209 } 210 211 void 212 sh_err(int status, const char *fmt, ...) 213 { 214 va_list ap; 215 216 va_start(ap, fmt); 217 exvwarning(errno, fmt, ap); 218 va_end(ap); 219 sh_exit(status); 220 } 221 222 void 223 sh_verr(int status, const char *fmt, va_list ap) 224 { 225 exvwarning(errno, fmt, ap); 226 sh_exit(status); 227 } 228 229 void 230 sh_errx(int status, const char *fmt, ...) 231 { 232 va_list ap; 233 234 va_start(ap, fmt); 235 exvwarning(-1, fmt, ap); 236 va_end(ap); 237 sh_exit(status); 238 } 239 240 void 241 sh_verrx(int status, const char *fmt, va_list ap) 242 { 243 exvwarning(-1, fmt, ap); 244 sh_exit(status); 245 } 246 247 void 248 sh_warn(const char *fmt, ...) 249 { 250 va_list ap; 251 252 va_start(ap, fmt); 253 exvwarning(errno, fmt, ap); 254 va_end(ap); 255 } 256 257 void 258 sh_vwarn(const char *fmt, va_list ap) 259 { 260 exvwarning(errno, fmt, ap); 261 } 262 263 void 264 sh_warnx(const char *fmt, ...) 265 { 266 va_list ap; 267 268 va_start(ap, fmt); 269 exvwarning(-1, fmt, ap); 270 va_end(ap); 271 } 272 273 void 274 sh_vwarnx(const char *fmt, va_list ap) 275 { 276 exvwarning(-1, fmt, ap); 277 } 278 279 280 /* 281 * Table of error messages. 282 */ 283 284 struct errname { 285 short errcode; /* error number */ 286 short action; /* operation which encountered the error */ 287 const char *msg; /* text describing the error */ 288 }; 289 290 291 #define ALL (E_OPEN|E_CREAT|E_EXEC) 292 293 STATIC const struct errname errormsg[] = { 294 { EINTR, ALL, "interrupted" }, 295 { EACCES, ALL, "permission denied" }, 296 { EIO, ALL, "I/O error" }, 297 { EEXIST, ALL, "file exists" }, 298 { ENOENT, E_OPEN, "no such file" }, 299 { ENOENT, E_CREAT,"directory nonexistent" }, 300 { ENOENT, E_EXEC, "not found" }, 301 { ENOTDIR, E_OPEN, "no such file" }, 302 { ENOTDIR, E_CREAT,"directory nonexistent" }, 303 { ENOTDIR, E_EXEC, "not found" }, 304 { EISDIR, ALL, "is a directory" }, 305 #ifdef EMFILE 306 { EMFILE, ALL, "too many open files" }, 307 #endif 308 { ENFILE, ALL, "file table overflow" }, 309 { ENOSPC, ALL, "file system full" }, 310 #ifdef EDQUOT 311 { EDQUOT, ALL, "disk quota exceeded" }, 312 #endif 313 #ifdef ENOSR 314 { ENOSR, ALL, "no streams resources" }, 315 #endif 316 { ENXIO, ALL, "no such device or address" }, 317 { EROFS, ALL, "read-only file system" }, 318 { ETXTBSY, ALL, "text busy" }, 319 #ifdef EAGAIN 320 { EAGAIN, E_EXEC, "not enough memory" }, 321 #endif 322 { ENOMEM, ALL, "not enough memory" }, 323 #ifdef ENOLINK 324 { ENOLINK, ALL, "remote access failed" }, 325 #endif 326 #ifdef EMULTIHOP 327 { EMULTIHOP, ALL, "remote access failed" }, 328 #endif 329 #ifdef ECOMM 330 { ECOMM, ALL, "remote access failed" }, 331 #endif 332 #ifdef ESTALE 333 { ESTALE, ALL, "remote access failed" }, 334 #endif 335 #ifdef ETIMEDOUT 336 { ETIMEDOUT, ALL, "remote access failed" }, 337 #endif 338 #ifdef ELOOP 339 { ELOOP, ALL, "symbolic link loop" }, 340 #endif 341 #ifdef ENAMETOOLONG 342 { ENAMETOOLONG, ALL, "file name too long" }, 343 #endif 344 { E2BIG, E_EXEC, "argument list too long" }, 345 #ifdef ELIBACC 346 { ELIBACC, E_EXEC, "shared library missing" }, 347 #endif 348 { 0, 0, NULL }, 349 }; 350 351 352 /* 353 * Return a string describing an error. The returned string may be a 354 * pointer to a static buffer that will be overwritten on the next call. 355 * Action describes the operation that got the error. 356 */ 357 358 const char * 359 errmsg(int e, int action) 360 { 361 struct errname const *ep; 362 static char buf[12]; 363 364 for (ep = errormsg ; ep->errcode ; ep++) { 365 if (ep->errcode == e && (ep->action & action) != 0) 366 return ep->msg; 367 } 368 fmtstr(buf, sizeof buf, "error %d", e); 369 return buf; 370 } 371