1 /* $NetBSD: error.c,v 1.43 2019/02/04 11:16:41 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 1.43 2019/02/04 11:16:41 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 volatile int errors_suppressed; 73 const char * volatile currentcontext; 74 75 76 77 static void exverror(int, const char *, va_list) __dead; 78 79 /* 80 * Called to raise an exception. Since C doesn't include exceptions, we 81 * just do a longjmp to the exception handler. The type of exception is 82 * stored in the global variable "exception". 83 */ 84 85 void 86 exraise(int e) 87 { 88 CTRACE(DBG_ERRS, ("exraise(%d)\n", e)); 89 if (handler == NULL) 90 abort(); 91 exception = e; 92 longjmp(handler->loc, 1); 93 } 94 95 96 /* 97 * Called from trap.c when a SIGINT is received. (If the user specifies 98 * that SIGINT is to be trapped or ignored using the trap builtin, then 99 * this routine is not called.) Suppressint is nonzero when interrupts 100 * are held using the INTOFF macro. The call to _exit is necessary because 101 * there is a short period after a fork before the signal handlers are 102 * set to the appropriate value for the child. (The test for iflag is 103 * just defensive programming.) 104 */ 105 106 void 107 onint(void) 108 { 109 sigset_t nsigset; 110 111 if (suppressint) { 112 intpending = 1; 113 return; 114 } 115 intpending = 0; 116 sigemptyset(&nsigset); 117 sigprocmask(SIG_SETMASK, &nsigset, NULL); 118 if (rootshell && iflag) 119 exraise(EXINT); 120 else { 121 signal(SIGINT, SIG_DFL); 122 raise(SIGINT); 123 } 124 /* NOTREACHED */ 125 } 126 127 static __printflike(2, 0) void 128 exvwarning(int sv_errno, const char *msg, va_list ap) 129 { 130 /* Partially emulate line buffered output so that: 131 * printf '%d\n' 1 a 2 132 * and 133 * printf '%d %d %d\n' 1 a 2 134 * both generate sensible text when stdout and stderr are merged. 135 */ 136 if (output.buf != NULL && output.nextc != output.buf && 137 output.nextc[-1] == '\n') 138 flushout(&output); 139 140 if (errors_suppressed) 141 return; 142 143 if (commandname) 144 outfmt(&errout, "%s: ", commandname); 145 else 146 outfmt(&errout, "%s: ", getprogname()); 147 if (currentcontext != NULL) 148 outfmt(&errout, "%s: ", currentcontext); 149 if (msg != NULL) { 150 doformat(&errout, msg, ap); 151 if (sv_errno >= 0) 152 outfmt(&errout, ": "); 153 } 154 if (sv_errno >= 0) 155 outfmt(&errout, "%s", strerror(sv_errno)); 156 out2c('\n'); 157 flushout(&errout); 158 } 159 160 /* 161 * Exverror is called to raise the error exception. If the second argument 162 * is not NULL then error prints an error message using printf style 163 * formatting. It then raises the error exception. 164 */ 165 static __printflike(2, 0) void 166 exverror(int cond, const char *msg, va_list ap) 167 { 168 CLEAR_PENDING_INT; 169 INTOFF; 170 171 #ifdef DEBUG 172 if (msg) { 173 CTRACE(DBG_ERRS, ("exverror(%d, \"", cond)); 174 CTRACEV(DBG_ERRS, (msg, ap)); 175 CTRACE(DBG_ERRS, ("\") pid=%d\n", getpid())); 176 } else 177 CTRACE(DBG_ERRS, ("exverror(%d, NULL) pid=%d\n", cond, 178 getpid())); 179 #endif 180 if (msg) 181 exvwarning(-1, msg, ap); 182 183 flushall(); 184 exraise(cond); 185 /* NOTREACHED */ 186 } 187 188 189 void 190 error(const char *msg, ...) 191 { 192 va_list ap; 193 194 /* 195 * On error, we certainly never want exit(0)... 196 */ 197 if (exerrno == 0) 198 exerrno = 1; 199 va_start(ap, msg); 200 exverror(EXERROR, msg, ap); 201 /* NOTREACHED */ 202 va_end(ap); 203 } 204 205 206 void 207 exerror(int cond, const char *msg, ...) 208 { 209 va_list ap; 210 211 va_start(ap, msg); 212 exverror(cond, msg, ap); 213 /* NOTREACHED */ 214 va_end(ap); 215 } 216 217 /* 218 * error/warning routines for external builtins 219 */ 220 221 void 222 sh_exit(int rval) 223 { 224 exerrno = rval & 255; 225 exraise(EXEXEC); 226 } 227 228 void 229 sh_err(int status, const char *fmt, ...) 230 { 231 va_list ap; 232 233 va_start(ap, fmt); 234 exvwarning(errno, fmt, ap); 235 va_end(ap); 236 sh_exit(status); 237 } 238 239 void 240 sh_verr(int status, const char *fmt, va_list ap) 241 { 242 exvwarning(errno, fmt, ap); 243 sh_exit(status); 244 } 245 246 void 247 sh_errx(int status, const char *fmt, ...) 248 { 249 va_list ap; 250 251 va_start(ap, fmt); 252 exvwarning(-1, fmt, ap); 253 va_end(ap); 254 sh_exit(status); 255 } 256 257 void 258 sh_verrx(int status, const char *fmt, va_list ap) 259 { 260 exvwarning(-1, fmt, ap); 261 sh_exit(status); 262 } 263 264 void 265 sh_warn(const char *fmt, ...) 266 { 267 va_list ap; 268 269 va_start(ap, fmt); 270 exvwarning(errno, fmt, ap); 271 va_end(ap); 272 } 273 274 void 275 sh_vwarn(const char *fmt, va_list ap) 276 { 277 exvwarning(errno, fmt, ap); 278 } 279 280 void 281 sh_warnx(const char *fmt, ...) 282 { 283 va_list ap; 284 285 va_start(ap, fmt); 286 exvwarning(-1, fmt, ap); 287 va_end(ap); 288 } 289 290 void 291 sh_vwarnx(const char *fmt, va_list ap) 292 { 293 exvwarning(-1, fmt, ap); 294 } 295 296 297 /* 298 * Table of error messages. 299 */ 300 301 struct errname { 302 short errcode; /* error number */ 303 short action; /* operation which encountered the error */ 304 const char *msg; /* text describing the error */ 305 }; 306 307 308 #define ALL (E_OPEN|E_CREAT|E_EXEC) 309 310 STATIC const struct errname errormsg[] = { 311 { EINTR, ALL, "interrupted" }, 312 { EACCES, ALL, "permission denied" }, 313 { EIO, ALL, "I/O error" }, 314 { EEXIST, ALL, "file exists" }, 315 { ENOENT, E_OPEN, "no such file" }, 316 { ENOENT, E_CREAT,"directory nonexistent" }, 317 { ENOENT, E_EXEC, "not found" }, 318 { ENOTDIR, E_OPEN, "no such file" }, 319 { ENOTDIR, E_CREAT,"directory nonexistent" }, 320 { ENOTDIR, E_EXEC, "not found" }, 321 { EISDIR, ALL, "is a directory" }, 322 #ifdef EMFILE 323 { EMFILE, ALL, "too many open files" }, 324 #endif 325 { ENFILE, ALL, "file table overflow" }, 326 { ENOSPC, ALL, "file system full" }, 327 #ifdef EDQUOT 328 { EDQUOT, ALL, "disk quota exceeded" }, 329 #endif 330 #ifdef ENOSR 331 { ENOSR, ALL, "no streams resources" }, 332 #endif 333 { ENXIO, ALL, "no such device or address" }, 334 { EROFS, ALL, "read-only file system" }, 335 { ETXTBSY, ALL, "text busy" }, 336 #ifdef EAGAIN 337 { EAGAIN, E_EXEC, "not enough memory" }, 338 #endif 339 { ENOMEM, ALL, "not enough memory" }, 340 #ifdef ENOLINK 341 { ENOLINK, ALL, "remote access failed" }, 342 #endif 343 #ifdef EMULTIHOP 344 { EMULTIHOP, ALL, "remote access failed" }, 345 #endif 346 #ifdef ECOMM 347 { ECOMM, ALL, "remote access failed" }, 348 #endif 349 #ifdef ESTALE 350 { ESTALE, ALL, "remote access failed" }, 351 #endif 352 #ifdef ETIMEDOUT 353 { ETIMEDOUT, ALL, "remote access failed" }, 354 #endif 355 #ifdef ELOOP 356 { ELOOP, ALL, "symbolic link loop" }, 357 #endif 358 #ifdef ENAMETOOLONG 359 { ENAMETOOLONG, ALL, "file name too long" }, 360 #endif 361 { E2BIG, E_EXEC, "argument list too long" }, 362 #ifdef ELIBACC 363 { ELIBACC, E_EXEC, "shared library missing" }, 364 #endif 365 { 0, 0, NULL }, 366 }; 367 368 369 /* 370 * Return a string describing an error. The returned string may be a 371 * pointer to a static buffer that will be overwritten on the next call. 372 * Action describes the operation that got the error. 373 */ 374 375 const char * 376 errmsg(int e, int action) 377 { 378 struct errname const *ep; 379 static char buf[12]; 380 381 for (ep = errormsg ; ep->errcode ; ep++) { 382 if (ep->errcode == e && (ep->action & action) != 0) 383 return ep->msg; 384 } 385 fmtstr(buf, sizeof buf, "error %d", e); 386 return buf; 387 } 388