1 /* $NetBSD: error.c,v 1.39 2016/06/01 02:50:02 kre 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 1.39 2016/06/01 02:50:02 kre 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 __printflike(2, 0) 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 __printflike(2, 0) 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 /* 183 * On error, we certainly never want exit(0)... 184 */ 185 if (exerrno == 0) 186 exerrno = 1; 187 va_start(ap, msg); 188 exverror(EXERROR, msg, ap); 189 /* NOTREACHED */ 190 va_end(ap); 191 } 192 193 194 void 195 exerror(int cond, const char *msg, ...) 196 { 197 va_list ap; 198 199 va_start(ap, msg); 200 exverror(cond, msg, ap); 201 /* NOTREACHED */ 202 va_end(ap); 203 } 204 205 /* 206 * error/warning routines for external builtins 207 */ 208 209 void 210 sh_exit(int rval) 211 { 212 exerrno = rval & 255; 213 exraise(EXEXEC); 214 } 215 216 void 217 sh_err(int status, const char *fmt, ...) 218 { 219 va_list ap; 220 221 va_start(ap, fmt); 222 exvwarning(errno, fmt, ap); 223 va_end(ap); 224 sh_exit(status); 225 } 226 227 void 228 sh_verr(int status, const char *fmt, va_list ap) 229 { 230 exvwarning(errno, fmt, ap); 231 sh_exit(status); 232 } 233 234 void 235 sh_errx(int status, const char *fmt, ...) 236 { 237 va_list ap; 238 239 va_start(ap, fmt); 240 exvwarning(-1, fmt, ap); 241 va_end(ap); 242 sh_exit(status); 243 } 244 245 void 246 sh_verrx(int status, const char *fmt, va_list ap) 247 { 248 exvwarning(-1, fmt, ap); 249 sh_exit(status); 250 } 251 252 void 253 sh_warn(const char *fmt, ...) 254 { 255 va_list ap; 256 257 va_start(ap, fmt); 258 exvwarning(errno, fmt, ap); 259 va_end(ap); 260 } 261 262 void 263 sh_vwarn(const char *fmt, va_list ap) 264 { 265 exvwarning(errno, fmt, ap); 266 } 267 268 void 269 sh_warnx(const char *fmt, ...) 270 { 271 va_list ap; 272 273 va_start(ap, fmt); 274 exvwarning(-1, fmt, ap); 275 va_end(ap); 276 } 277 278 void 279 sh_vwarnx(const char *fmt, va_list ap) 280 { 281 exvwarning(-1, fmt, ap); 282 } 283 284 285 /* 286 * Table of error messages. 287 */ 288 289 struct errname { 290 short errcode; /* error number */ 291 short action; /* operation which encountered the error */ 292 const char *msg; /* text describing the error */ 293 }; 294 295 296 #define ALL (E_OPEN|E_CREAT|E_EXEC) 297 298 STATIC const struct errname errormsg[] = { 299 { EINTR, ALL, "interrupted" }, 300 { EACCES, ALL, "permission denied" }, 301 { EIO, ALL, "I/O error" }, 302 { EEXIST, ALL, "file exists" }, 303 { ENOENT, E_OPEN, "no such file" }, 304 { ENOENT, E_CREAT,"directory nonexistent" }, 305 { ENOENT, E_EXEC, "not found" }, 306 { ENOTDIR, E_OPEN, "no such file" }, 307 { ENOTDIR, E_CREAT,"directory nonexistent" }, 308 { ENOTDIR, E_EXEC, "not found" }, 309 { EISDIR, ALL, "is a directory" }, 310 #ifdef EMFILE 311 { EMFILE, ALL, "too many open files" }, 312 #endif 313 { ENFILE, ALL, "file table overflow" }, 314 { ENOSPC, ALL, "file system full" }, 315 #ifdef EDQUOT 316 { EDQUOT, ALL, "disk quota exceeded" }, 317 #endif 318 #ifdef ENOSR 319 { ENOSR, ALL, "no streams resources" }, 320 #endif 321 { ENXIO, ALL, "no such device or address" }, 322 { EROFS, ALL, "read-only file system" }, 323 { ETXTBSY, ALL, "text busy" }, 324 #ifdef EAGAIN 325 { EAGAIN, E_EXEC, "not enough memory" }, 326 #endif 327 { ENOMEM, ALL, "not enough memory" }, 328 #ifdef ENOLINK 329 { ENOLINK, ALL, "remote access failed" }, 330 #endif 331 #ifdef EMULTIHOP 332 { EMULTIHOP, ALL, "remote access failed" }, 333 #endif 334 #ifdef ECOMM 335 { ECOMM, ALL, "remote access failed" }, 336 #endif 337 #ifdef ESTALE 338 { ESTALE, ALL, "remote access failed" }, 339 #endif 340 #ifdef ETIMEDOUT 341 { ETIMEDOUT, ALL, "remote access failed" }, 342 #endif 343 #ifdef ELOOP 344 { ELOOP, ALL, "symbolic link loop" }, 345 #endif 346 #ifdef ENAMETOOLONG 347 { ENAMETOOLONG, ALL, "file name too long" }, 348 #endif 349 { E2BIG, E_EXEC, "argument list too long" }, 350 #ifdef ELIBACC 351 { ELIBACC, E_EXEC, "shared library missing" }, 352 #endif 353 { 0, 0, NULL }, 354 }; 355 356 357 /* 358 * Return a string describing an error. The returned string may be a 359 * pointer to a static buffer that will be overwritten on the next call. 360 * Action describes the operation that got the error. 361 */ 362 363 const char * 364 errmsg(int e, int action) 365 { 366 struct errname const *ep; 367 static char buf[12]; 368 369 for (ep = errormsg ; ep->errcode ; ep++) { 370 if (ep->errcode == e && (ep->action & action) != 0) 371 return ep->msg; 372 } 373 fmtstr(buf, sizeof buf, "error %d", e); 374 return buf; 375 } 376