1 /* $NetBSD: error.c,v 1.31 2003/08/07 09:05:30 agc 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 1.31 2003/08/07 09:05:30 agc 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 "main.h" 57 #include "options.h" 58 #include "output.h" 59 #include "error.h" 60 #include "show.h" 61 62 #define signal bsd_signal 63 /* 64 * Code to handle exceptions in C. 65 */ 66 67 struct jmploc *handler; 68 int exception; 69 volatile int suppressint; 70 volatile int intpending; 71 char *commandname; 72 73 74 static void exverror(int, const char *, va_list) 75 __attribute__((__noreturn__)); 76 77 /* 78 * Called to raise an exception. Since C doesn't include exceptions, we 79 * just do a longjmp to the exception handler. The type of exception is 80 * stored in the global variable "exception". 81 */ 82 83 void 84 exraise(int e) 85 { 86 if (handler == NULL) 87 abort(); 88 exception = e; 89 longjmp(handler->loc, 1); 90 } 91 92 93 /* 94 * Called from trap.c when a SIGINT is received. (If the user specifies 95 * that SIGINT is to be trapped or ignored using the trap builtin, then 96 * this routine is not called.) Suppressint is nonzero when interrupts 97 * are held using the INTOFF macro. The call to _exit is necessary because 98 * there is a short period after a fork before the signal handlers are 99 * set to the appropriate value for the child. (The test for iflag is 100 * just defensive programming.) 101 */ 102 103 void 104 onint(void) 105 { 106 sigset_t nsigset; 107 108 if (suppressint) { 109 intpending = 1; 110 return; 111 } 112 intpending = 0; 113 sigemptyset(&nsigset); 114 sigprocmask(SIG_SETMASK, &nsigset, NULL); 115 if (rootshell && iflag) 116 exraise(EXINT); 117 else { 118 signal(SIGINT, SIG_DFL); 119 raise(SIGINT); 120 } 121 /* NOTREACHED */ 122 } 123 124 static void 125 exvwarning(int sv_errno, const char *msg, va_list ap) 126 { 127 /* Partially emulate line buffered output so that: 128 * printf '%d\n' 1 a 2 129 * and 130 * printf '%d %d %d\n' 1 a 2 131 * both generate sensible text when stdout and stderr are merged. 132 */ 133 if (output.nextc != output.buf && output.nextc[-1] == '\n') 134 flushout(&output); 135 if (commandname) 136 outfmt(&errout, "%s: ", commandname); 137 if (msg != NULL) { 138 doformat(&errout, msg, ap); 139 if (sv_errno >= 0) 140 outfmt(&errout, ": "); 141 } 142 if (sv_errno >= 0) 143 outfmt(&errout, "%s", strerror(sv_errno)); 144 out2c('\n'); 145 flushout(&errout); 146 } 147 148 /* 149 * Exverror is called to raise the error exception. If the second argument 150 * is not NULL then error prints an error message using printf style 151 * formatting. It then raises the error exception. 152 */ 153 static void 154 exverror(int cond, const char *msg, va_list ap) 155 { 156 CLEAR_PENDING_INT; 157 INTOFF; 158 159 #ifdef DEBUG 160 if (msg) { 161 TRACE(("exverror(%d, \"", cond)); 162 TRACEV((msg, ap)); 163 TRACE(("\") pid=%d\n", getpid())); 164 } else 165 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 166 #endif 167 if (msg) 168 exvwarning(-1, msg, ap); 169 170 flushall(); 171 exraise(cond); 172 /* NOTREACHED */ 173 } 174 175 176 void 177 error(const char *msg, ...) 178 { 179 va_list ap; 180 181 va_start(ap, msg); 182 exverror(EXERROR, msg, ap); 183 /* NOTREACHED */ 184 va_end(ap); 185 } 186 187 188 void 189 exerror(int cond, const char *msg, ...) 190 { 191 va_list ap; 192 193 va_start(ap, msg); 194 exverror(cond, msg, ap); 195 /* NOTREACHED */ 196 va_end(ap); 197 } 198 199 /* 200 * error/warning routines for external builtins 201 */ 202 203 void 204 sh_exit(int rval) 205 { 206 exerrno = rval & 255; 207 exraise(EXEXEC); 208 } 209 210 void 211 sh_err(int status, const char *fmt, ...) 212 { 213 va_list ap; 214 215 va_start(ap, fmt); 216 exvwarning(errno, fmt, ap); 217 va_end(ap); 218 sh_exit(status); 219 } 220 221 void 222 sh_verr(int status, const char *fmt, va_list ap) 223 { 224 exvwarning(errno, fmt, ap); 225 sh_exit(status); 226 } 227 228 void 229 sh_errx(int status, const char *fmt, ...) 230 { 231 va_list ap; 232 233 va_start(ap, fmt); 234 exvwarning(-1, fmt, ap); 235 va_end(ap); 236 sh_exit(status); 237 } 238 239 void 240 sh_verrx(int status, const char *fmt, va_list ap) 241 { 242 exvwarning(-1, fmt, ap); 243 sh_exit(status); 244 } 245 246 void 247 sh_warn(const char *fmt, ...) 248 { 249 va_list ap; 250 251 va_start(ap, fmt); 252 exvwarning(errno, fmt, ap); 253 va_end(ap); 254 } 255 256 void 257 sh_vwarn(const char *fmt, va_list ap) 258 { 259 exvwarning(errno, fmt, ap); 260 } 261 262 void 263 sh_warnx(const char *fmt, ...) 264 { 265 va_list ap; 266 267 va_start(ap, fmt); 268 exvwarning(-1, fmt, ap); 269 va_end(ap); 270 } 271 272 void 273 sh_vwarnx(const char *fmt, va_list ap) 274 { 275 exvwarning(-1, fmt, ap); 276 } 277 278 279 /* 280 * Table of error messages. 281 */ 282 283 struct errname { 284 short errcode; /* error number */ 285 short action; /* operation which encountered the error */ 286 const char *msg; /* text describing the error */ 287 }; 288 289 290 #define ALL (E_OPEN|E_CREAT|E_EXEC) 291 292 STATIC const struct errname errormsg[] = { 293 { EINTR, ALL, "interrupted" }, 294 { EACCES, ALL, "permission denied" }, 295 { EIO, ALL, "I/O error" }, 296 { EEXIST, ALL, "file exists" }, 297 { ENOENT, E_OPEN, "no such file" }, 298 { ENOENT, E_CREAT,"directory nonexistent" }, 299 { ENOENT, E_EXEC, "not found" }, 300 { ENOTDIR, E_OPEN, "no such file" }, 301 { ENOTDIR, E_CREAT,"directory nonexistent" }, 302 { ENOTDIR, E_EXEC, "not found" }, 303 { EISDIR, ALL, "is a directory" }, 304 #ifdef EMFILE 305 { EMFILE, ALL, "too many open files" }, 306 #endif 307 { ENFILE, ALL, "file table overflow" }, 308 { ENOSPC, ALL, "file system full" }, 309 #ifdef EDQUOT 310 { EDQUOT, ALL, "disk quota exceeded" }, 311 #endif 312 #ifdef ENOSR 313 { ENOSR, ALL, "no streams resources" }, 314 #endif 315 { ENXIO, ALL, "no such device or address" }, 316 { EROFS, ALL, "read-only file system" }, 317 { ETXTBSY, ALL, "text busy" }, 318 #ifdef EAGAIN 319 { EAGAIN, E_EXEC, "not enough memory" }, 320 #endif 321 { ENOMEM, ALL, "not enough memory" }, 322 #ifdef ENOLINK 323 { ENOLINK, ALL, "remote access failed" }, 324 #endif 325 #ifdef EMULTIHOP 326 { EMULTIHOP, ALL, "remote access failed" }, 327 #endif 328 #ifdef ECOMM 329 { ECOMM, ALL, "remote access failed" }, 330 #endif 331 #ifdef ESTALE 332 { ESTALE, ALL, "remote access failed" }, 333 #endif 334 #ifdef ETIMEDOUT 335 { ETIMEDOUT, ALL, "remote access failed" }, 336 #endif 337 #ifdef ELOOP 338 { ELOOP, ALL, "symbolic link loop" }, 339 #endif 340 { E2BIG, E_EXEC, "argument list too long" }, 341 #ifdef ELIBACC 342 { ELIBACC, E_EXEC, "shared library missing" }, 343 #endif 344 { 0, 0, NULL }, 345 }; 346 347 348 /* 349 * Return a string describing an error. The returned string may be a 350 * pointer to a static buffer that will be overwritten on the next call. 351 * Action describes the operation that got the error. 352 */ 353 354 const char * 355 errmsg(int e, int action) 356 { 357 struct errname const *ep; 358 static char buf[12]; 359 360 for (ep = errormsg ; ep->errcode ; ep++) { 361 if (ep->errcode == e && (ep->action & action) != 0) 362 return ep->msg; 363 } 364 fmtstr(buf, sizeof buf, "error %d", e); 365 return buf; 366 } 367
