1 /* $NetBSD: error.c,v 1.45 2023/03/19 17:55:57 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 1.45 2023/03/19 17:55:57 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 VTRACE(DBG_ERRS|DBG_PROCS|DBG_CMDS, ("sh_exit(%d)\n", rval)); 225 exerrno = rval & 255; 226 exraise(EXEXEC); 227 } 228 229 void 230 sh_err(int status, const char *fmt, ...) 231 { 232 va_list ap; 233 234 va_start(ap, fmt); 235 exvwarning(errno, fmt, ap); 236 va_end(ap); 237 sh_exit(status); 238 } 239 240 void 241 sh_verr(int status, const char *fmt, va_list ap) 242 { 243 exvwarning(errno, fmt, ap); 244 sh_exit(status); 245 } 246 247 void 248 sh_errx(int status, const char *fmt, ...) 249 { 250 va_list ap; 251 252 va_start(ap, fmt); 253 exvwarning(-1, fmt, ap); 254 va_end(ap); 255 sh_exit(status); 256 } 257 258 void 259 sh_verrx(int status, const char *fmt, va_list ap) 260 { 261 exvwarning(-1, fmt, ap); 262 sh_exit(status); 263 } 264 265 void 266 sh_warn(const char *fmt, ...) 267 { 268 va_list ap; 269 270 va_start(ap, fmt); 271 exvwarning(errno, fmt, ap); 272 va_end(ap); 273 } 274 275 void 276 sh_vwarn(const char *fmt, va_list ap) 277 { 278 exvwarning(errno, fmt, ap); 279 } 280 281 void 282 sh_warnx(const char *fmt, ...) 283 { 284 va_list ap; 285 286 va_start(ap, fmt); 287 exvwarning(-1, fmt, ap); 288 va_end(ap); 289 } 290 291 void 292 sh_vwarnx(const char *fmt, va_list ap) 293 { 294 exvwarning(-1, fmt, ap); 295 } 296 297 298 /* 299 * Table of error messages. 300 */ 301 302 struct errname { 303 short errcode; /* error number */ 304 short action; /* operation which encountered the error */ 305 const char *msg; /* text describing the error */ 306 }; 307 308 309 #define ALL (E_OPEN|E_CREAT|E_EXEC) 310 311 STATIC const struct errname errormsg[] = { 312 { EINTR, ALL, "interrupted" }, 313 { EACCES, E_EXEC, "no execute permission" }, 314 { EACCES, ALL, "permission denied" }, 315 { EIO, ALL, "I/O error" }, 316 { EEXIST, ALL, "file exists" }, 317 { ENOENT, E_OPEN, "no such file" }, 318 { ENOENT, E_CREAT,"directory nonexistent" }, 319 { ENOENT, E_EXEC, "not found" }, 320 { ENOTDIR, E_OPEN, "no such file" }, 321 { ENOTDIR, E_CREAT,"directory nonexistent" }, 322 { ENOTDIR, E_EXEC, "not found" }, 323 { EISDIR, ALL, "is a directory" }, 324 #ifdef EMFILE 325 { EMFILE, ALL, "too many open files" }, 326 #endif 327 { ENFILE, ALL, "file table overflow" }, 328 { ENOSPC, ALL, "file system full" }, 329 #ifdef EDQUOT 330 { EDQUOT, ALL, "disk quota exceeded" }, 331 #endif 332 #ifdef ENOSR 333 { ENOSR, ALL, "no streams resources" }, 334 #endif 335 { ENXIO, ALL, "no such device or address" }, 336 { EROFS, ALL, "read-only file system" }, 337 { ETXTBSY, ALL, "text busy" }, 338 #ifdef EAGAIN 339 { EAGAIN, E_EXEC, "not enough memory" }, 340 #endif 341 { ENOMEM, ALL, "not enough memory" }, 342 #ifdef ENOLINK 343 { ENOLINK, ALL, "remote access failed" }, 344 #endif 345 #ifdef EMULTIHOP 346 { EMULTIHOP, ALL, "remote access failed" }, 347 #endif 348 #ifdef ECOMM 349 { ECOMM, ALL, "remote access failed" }, 350 #endif 351 #ifdef ESTALE 352 { ESTALE, ALL, "remote access failed" }, 353 #endif 354 #ifdef ETIMEDOUT 355 { ETIMEDOUT, ALL, "remote access failed" }, 356 #endif 357 #ifdef ELOOP 358 { ELOOP, ALL, "symbolic link loop" }, 359 #endif 360 #ifdef ENAMETOOLONG 361 { ENAMETOOLONG, ALL, "file name too long" }, 362 #endif 363 { E2BIG, E_EXEC, "argument list too long" }, 364 #ifdef ELIBACC 365 { ELIBACC, E_EXEC, "shared library missing" }, 366 #endif 367 { 0, 0, NULL }, 368 }; 369 370 371 /* 372 * Return a string describing an error. The returned string may be a 373 * pointer to a static buffer that will be overwritten on the next call. 374 * Action describes the operation that got the error. 375 */ 376 377 const char * 378 errmsg(int e, int action) 379 { 380 struct errname const *ep; 381 static char buf[12]; 382 383 for (ep = errormsg ; ep->errcode ; ep++) { 384 if (ep->errcode == e && (ep->action & action) != 0) 385 return ep->msg; 386 } 387 fmtstr(buf, sizeof buf, "error %d", e); 388 return buf; 389 } 390
Indexes created Sat Sep 20 22:09:52 GMT 2025