1 /* $NetBSD: error.c,v 1.30 2003/01/22 20:36:03 dsl 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 1.30 2003/01/22 20:36:03 dsl Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 /* 49 * Errors and exceptions. 50 */ 51 52 #include <signal.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 #include <errno.h> 56 #include <stdio.h> 57 #include <string.h> 58 59 #include "shell.h" 60 #include "main.h" 61 #include "options.h" 62 #include "output.h" 63 #include "error.h" 64 #include "show.h" 65 66 67 /* 68 * Code to handle exceptions in C. 69 */ 70 71 struct jmploc *handler; 72 int exception; 73 volatile int suppressint; 74 volatile int intpending; 75 char *commandname; 76 77 78 static void exverror(int, const char *, va_list) 79 __attribute__((__noreturn__)); 80 81 /* 82 * Called to raise an exception. Since C doesn't include exceptions, we 83 * just do a longjmp to the exception handler. The type of exception is 84 * stored in the global variable "exception". 85 */ 86 87 void 88 exraise(int e) 89 { 90 if (handler == NULL) 91 abort(); 92 exception = e; 93 longjmp(handler->loc, 1); 94 } 95 96 97 /* 98 * Called from trap.c when a SIGINT is received. (If the user specifies 99 * that SIGINT is to be trapped or ignored using the trap builtin, then 100 * this routine is not called.) Suppressint is nonzero when interrupts 101 * are held using the INTOFF macro. The call to _exit is necessary because 102 * there is a short period after a fork before the signal handlers are 103 * set to the appropriate value for the child. (The test for iflag is 104 * just defensive programming.) 105 */ 106 107 void 108 onint(void) 109 { 110 sigset_t nsigset; 111 112 if (suppressint) { 113 intpending = 1; 114 return; 115 } 116 intpending = 0; 117 sigemptyset(&nsigset); 118 sigprocmask(SIG_SETMASK, &nsigset, NULL); 119 if (rootshell && iflag) 120 exraise(EXINT); 121 else { 122 signal(SIGINT, SIG_DFL); 123 raise(SIGINT); 124 } 125 /* NOTREACHED */ 126 } 127 128 static void 129 exvwarning(int sv_errno, const char *msg, va_list ap) 130 { 131 /* Partially emulate line buffered output so that: 132 * printf '%d\n' 1 a 2 133 * and 134 * printf '%d %d %d\n' 1 a 2 135 * both generate sensible text when stdout and stderr are merged. 136 */ 137 if (output.nextc != output.buf && output.nextc[-1] == '\n') 138 flushout(&output); 139 if (commandname) 140 outfmt(&errout, "%s: ", commandname); 141 if (msg != NULL) { 142 doformat(&errout, msg, ap); 143 if (sv_errno >= 0) 144 outfmt(&errout, ": "); 145 } 146 if (sv_errno >= 0) 147 outfmt(&errout, "%s", strerror(sv_errno)); 148 out2c('\n'); 149 flushout(&errout); 150 } 151 152 /* 153 * Exverror is called to raise the error exception. If the second argument 154 * is not NULL then error prints an error message using printf style 155 * formatting. It then raises the error exception. 156 */ 157 static void 158 exverror(int cond, const char *msg, va_list ap) 159 { 160 CLEAR_PENDING_INT; 161 INTOFF; 162 163 #ifdef DEBUG 164 if (msg) { 165 TRACE(("exverror(%d, \"", cond)); 166 TRACEV((msg, ap)); 167 TRACE(("\") pid=%d\n", getpid())); 168 } else 169 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 170 #endif 171 if (msg) 172 exvwarning(-1, msg, ap); 173 174 flushall(); 175 exraise(cond); 176 /* NOTREACHED */ 177 } 178 179 180 void 181 error(const char *msg, ...) 182 { 183 va_list ap; 184 185 va_start(ap, msg); 186 exverror(EXERROR, msg, ap); 187 /* NOTREACHED */ 188 va_end(ap); 189 } 190 191 192 void 193 exerror(int cond, const char *msg, ...) 194 { 195 va_list ap; 196 197 va_start(ap, msg); 198 exverror(cond, msg, ap); 199 /* NOTREACHED */ 200 va_end(ap); 201 } 202 203 /* 204 * error/warning routines for external builtins 205 */ 206 207 void 208 sh_exit(int rval) 209 { 210 exerrno = rval & 255; 211 exraise(EXEXEC); 212 } 213 214 void 215 sh_err(int status, const char *fmt, ...) 216 { 217 va_list ap; 218 219 va_start(ap, fmt); 220 exvwarning(errno, fmt, ap); 221 va_end(ap); 222 sh_exit(status); 223 } 224 225 void 226 sh_verr(int status, const char *fmt, va_list ap) 227 { 228 exvwarning(errno, fmt, ap); 229 sh_exit(status); 230 } 231 232 void 233 sh_errx(int status, const char *fmt, ...) 234 { 235 va_list ap; 236 237 va_start(ap, fmt); 238 exvwarning(-1, fmt, ap); 239 va_end(ap); 240 sh_exit(status); 241 } 242 243 void 244 sh_verrx(int status, const char *fmt, va_list ap) 245 { 246 exvwarning(-1, fmt, ap); 247 sh_exit(status); 248 } 249 250 void 251 sh_warn(const char *fmt, ...) 252 { 253 va_list ap; 254 255 va_start(ap, fmt); 256 exvwarning(errno, fmt, ap); 257 va_end(ap); 258 } 259 260 void 261 sh_vwarn(const char *fmt, va_list ap) 262 { 263 exvwarning(errno, fmt, ap); 264 } 265 266 void 267 sh_warnx(const char *fmt, ...) 268 { 269 va_list ap; 270 271 va_start(ap, fmt); 272 exvwarning(-1, fmt, ap); 273 va_end(ap); 274 } 275 276 void 277 sh_vwarnx(const char *fmt, va_list ap) 278 { 279 exvwarning(-1, fmt, ap); 280 } 281 282 283 /* 284 * Table of error messages. 285 */ 286 287 struct errname { 288 short errcode; /* error number */ 289 short action; /* operation which encountered the error */ 290 const char *msg; /* text describing the error */ 291 }; 292 293 294 #define ALL (E_OPEN|E_CREAT|E_EXEC) 295 296 STATIC const struct errname errormsg[] = { 297 { EINTR, ALL, "interrupted" }, 298 { EACCES, ALL, "permission denied" }, 299 { EIO, ALL, "I/O error" }, 300 { EEXIST, ALL, "file exists" }, 301 { ENOENT, E_OPEN, "no such file" }, 302 { ENOENT, E_CREAT,"directory nonexistent" }, 303 { ENOENT, E_EXEC, "not found" }, 304 { ENOTDIR, E_OPEN, "no such file" }, 305 { ENOTDIR, E_CREAT,"directory nonexistent" }, 306 { ENOTDIR, E_EXEC, "not found" }, 307 { EISDIR, ALL, "is a directory" }, 308 #ifdef EMFILE 309 { EMFILE, ALL, "too many open files" }, 310 #endif 311 { ENFILE, ALL, "file table overflow" }, 312 { ENOSPC, ALL, "file system full" }, 313 #ifdef EDQUOT 314 { EDQUOT, ALL, "disk quota exceeded" }, 315 #endif 316 #ifdef ENOSR 317 { ENOSR, ALL, "no streams resources" }, 318 #endif 319 { ENXIO, ALL, "no such device or address" }, 320 { EROFS, ALL, "read-only file system" }, 321 { ETXTBSY, ALL, "text busy" }, 322 #ifdef EAGAIN 323 { EAGAIN, E_EXEC, "not enough memory" }, 324 #endif 325 { ENOMEM, ALL, "not enough memory" }, 326 #ifdef ENOLINK 327 { ENOLINK, ALL, "remote access failed" }, 328 #endif 329 #ifdef EMULTIHOP 330 { EMULTIHOP, ALL, "remote access failed" }, 331 #endif 332 #ifdef ECOMM 333 { ECOMM, ALL, "remote access failed" }, 334 #endif 335 #ifdef ESTALE 336 { ESTALE, ALL, "remote access failed" }, 337 #endif 338 #ifdef ETIMEDOUT 339 { ETIMEDOUT, ALL, "remote access failed" }, 340 #endif 341 #ifdef ELOOP 342 { ELOOP, ALL, "symbolic link loop" }, 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