1 /* $NetBSD: error.c,v 1.28 2002/11/24 22:35:39 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 1.28 2002/11/24 22:35:39 christos 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 sigset; 111 112 if (suppressint) { 113 intpending = 1; 114 return; 115 } 116 intpending = 0; 117 sigemptyset(&sigset); 118 sigprocmask(SIG_SETMASK, &sigset, 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, \"%s\") pid=%d\n", cond, msg, getpid())); 166 else 167 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 168 #endif 169 if (msg) 170 exvwarning(-1, msg, ap); 171 172 flushall(); 173 exraise(cond); 174 /* NOTREACHED */ 175 } 176 177 178 void 179 error(const char *msg, ...) 180 { 181 va_list ap; 182 183 va_start(ap, msg); 184 exverror(EXERROR, msg, ap); 185 /* NOTREACHED */ 186 va_end(ap); 187 } 188 189 190 void 191 exerror(int cond, const char *msg, ...) 192 { 193 va_list ap; 194 195 va_start(ap, msg); 196 exverror(cond, msg, ap); 197 /* NOTREACHED */ 198 va_end(ap); 199 } 200 201 /* 202 * error/warning routines for external builtins 203 */ 204 205 void 206 sh_exit(int rval) 207 { 208 exerrno = rval & 255; 209 exraise(EXEXEC); 210 } 211 212 void 213 sh_err(int status, const char *fmt, ...) 214 { 215 va_list ap; 216 217 va_start(ap, fmt); 218 exvwarning(errno, fmt, ap); 219 va_end(ap); 220 sh_exit(status); 221 } 222 223 void 224 sh_verr(int status, const char *fmt, va_list ap) 225 { 226 exvwarning(errno, fmt, ap); 227 sh_exit(status); 228 } 229 230 void 231 sh_errx(int status, const char *fmt, ...) 232 { 233 va_list ap; 234 235 va_start(ap, fmt); 236 exvwarning(-1, fmt, ap); 237 va_end(ap); 238 sh_exit(status); 239 } 240 241 void 242 sh_verrx(int status, const char *fmt, va_list ap) 243 { 244 exvwarning(-1, fmt, ap); 245 sh_exit(status); 246 } 247 248 void 249 sh_warn(const char *fmt, ...) 250 { 251 va_list ap; 252 253 va_start(ap, fmt); 254 exvwarning(errno, fmt, ap); 255 va_end(ap); 256 } 257 258 void 259 sh_vwarn(const char *fmt, va_list ap) 260 { 261 exvwarning(errno, fmt, ap); 262 } 263 264 void 265 sh_warnx(const char *fmt, ...) 266 { 267 va_list ap; 268 269 va_start(ap, fmt); 270 exvwarning(-1, fmt, ap); 271 va_end(ap); 272 } 273 274 void 275 sh_vwarnx(const char *fmt, va_list ap) 276 { 277 exvwarning(-1, fmt, ap); 278 } 279 280 281 /* 282 * Table of error messages. 283 */ 284 285 struct errname { 286 short errcode; /* error number */ 287 short action; /* operation which encountered the error */ 288 const char *msg; /* text describing the error */ 289 }; 290 291 292 #define ALL (E_OPEN|E_CREAT|E_EXEC) 293 294 STATIC const struct errname errormsg[] = { 295 { EINTR, ALL, "interrupted" }, 296 { EACCES, ALL, "permission denied" }, 297 { EIO, ALL, "I/O error" }, 298 { EEXIST, ALL, "file exists" }, 299 { ENOENT, E_OPEN, "no such file" }, 300 { ENOENT, E_CREAT,"directory nonexistent" }, 301 { ENOENT, E_EXEC, "not found" }, 302 { ENOTDIR, E_OPEN, "no such file" }, 303 { ENOTDIR, E_CREAT,"directory nonexistent" }, 304 { ENOTDIR, E_EXEC, "not found" }, 305 { EISDIR, ALL, "is a directory" }, 306 #ifdef EMFILE 307 { EMFILE, ALL, "too many open files" }, 308 #endif 309 { ENFILE, ALL, "file table overflow" }, 310 { ENOSPC, ALL, "file system full" }, 311 #ifdef EDQUOT 312 { EDQUOT, ALL, "disk quota exceeded" }, 313 #endif 314 #ifdef ENOSR 315 { ENOSR, ALL, "no streams resources" }, 316 #endif 317 { ENXIO, ALL, "no such device or address" }, 318 { EROFS, ALL, "read-only file system" }, 319 { ETXTBSY, ALL, "text busy" }, 320 #ifdef EAGAIN 321 { EAGAIN, E_EXEC, "not enough memory" }, 322 #endif 323 { ENOMEM, ALL, "not enough memory" }, 324 #ifdef ENOLINK 325 { ENOLINK, ALL, "remote access failed" }, 326 #endif 327 #ifdef EMULTIHOP 328 { EMULTIHOP, ALL, "remote access failed" }, 329 #endif 330 #ifdef ECOMM 331 { ECOMM, ALL, "remote access failed" }, 332 #endif 333 #ifdef ESTALE 334 { ESTALE, ALL, "remote access failed" }, 335 #endif 336 #ifdef ETIMEDOUT 337 { ETIMEDOUT, ALL, "remote access failed" }, 338 #endif 339 #ifdef ELOOP 340 { ELOOP, ALL, "symbolic link loop" }, 341 #endif 342 { E2BIG, E_EXEC, "argument list too long" }, 343 #ifdef ELIBACC 344 { ELIBACC, E_EXEC, "shared library missing" }, 345 #endif 346 { 0, 0, NULL }, 347 }; 348 349 350 /* 351 * Return a string describing an error. The returned string may be a 352 * pointer to a static buffer that will be overwritten on the next call. 353 * Action describes the operation that got the error. 354 */ 355 356 const char * 357 errmsg(int e, int action) 358 { 359 struct errname const *ep; 360 static char buf[12]; 361 362 for (ep = errormsg ; ep->errcode ; ep++) { 363 if (ep->errcode == e && (ep->action & action) != 0) 364 return ep->msg; 365 } 366 fmtstr(buf, sizeof buf, "error %d", e); 367 return buf; 368 } 369