1 /* $NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt 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 1.23 2000/07/03 03:26:19 matt 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 57 #include "shell.h" 58 #include "main.h" 59 #include "options.h" 60 #include "output.h" 61 #include "error.h" 62 #include "show.h" 63 64 65 /* 66 * Code to handle exceptions in C. 67 */ 68 69 struct jmploc *handler; 70 int exception; 71 volatile int suppressint; 72 volatile int intpending; 73 char *commandname; 74 75 76 static void exverror __P((int, const char *, va_list)) 77 __attribute__((__noreturn__)); 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(e) 87 int e; 88 { 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() { 108 sigset_t sigset; 109 110 if (suppressint) { 111 intpending++; 112 return; 113 } 114 intpending = 0; 115 sigemptyset(&sigset); 116 sigprocmask(SIG_SETMASK, &sigset, NULL); 117 if (rootshell && iflag) 118 exraise(EXINT); 119 else { 120 signal(SIGINT, SIG_DFL); 121 raise(SIGINT); 122 } 123 /* NOTREACHED */ 124 } 125 126 127 /* 128 * Exverror is called to raise the error exception. If the first argument 129 * is not NULL then error prints an error message using printf style 130 * formatting. It then raises the error exception. 131 */ 132 static void 133 exverror(cond, msg, ap) 134 int cond; 135 const char *msg; 136 va_list ap; 137 { 138 CLEAR_PENDING_INT; 139 INTOFF; 140 141 #ifdef DEBUG 142 if (msg) 143 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 144 else 145 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 146 #endif 147 if (msg) { 148 if (commandname) 149 outfmt(&errout, "%s: ", commandname); 150 doformat(&errout, msg, ap); 151 out2c('\n'); 152 } 153 flushall(); 154 exraise(cond); 155 /* NOTREACHED */ 156 } 157 158 159 #ifdef __STDC__ 160 void 161 error(const char *msg, ...) 162 #else 163 void 164 error(va_alist) 165 va_dcl 166 #endif 167 { 168 #ifndef __STDC__ 169 const char *msg; 170 #endif 171 va_list ap; 172 #ifdef __STDC__ 173 va_start(ap, msg); 174 #else 175 va_start(ap); 176 msg = va_arg(ap, const char *); 177 #endif 178 exverror(EXERROR, msg, ap); 179 /* NOTREACHED */ 180 va_end(ap); 181 } 182 183 184 #ifdef __STDC__ 185 void 186 exerror(int cond, const char *msg, ...) 187 #else 188 void 189 exerror(va_alist) 190 va_dcl 191 #endif 192 { 193 #ifndef __STDC__ 194 int cond; 195 const char *msg; 196 #endif 197 va_list ap; 198 #ifdef __STDC__ 199 va_start(ap, msg); 200 #else 201 va_start(ap); 202 cond = va_arg(ap, int); 203 msg = va_arg(ap, const char *); 204 #endif 205 exverror(cond, msg, ap); 206 /* NOTREACHED */ 207 va_end(ap); 208 } 209 210 211 212 /* 213 * Table of error messages. 214 */ 215 216 struct errname { 217 short errcode; /* error number */ 218 short action; /* operation which encountered the error */ 219 const char *msg; /* text describing the error */ 220 }; 221 222 223 #define ALL (E_OPEN|E_CREAT|E_EXEC) 224 225 STATIC const struct errname errormsg[] = { 226 { EINTR, ALL, "interrupted" }, 227 { EACCES, ALL, "permission denied" }, 228 { EIO, ALL, "I/O error" }, 229 { ENOENT, E_OPEN, "no such file" }, 230 { ENOENT, E_CREAT,"directory nonexistent" }, 231 { ENOENT, E_EXEC, "not found" }, 232 { ENOTDIR, E_OPEN, "no such file" }, 233 { ENOTDIR, E_CREAT,"directory nonexistent" }, 234 { ENOTDIR, E_EXEC, "not found" }, 235 { EISDIR, ALL, "is a directory" }, 236 #ifdef notdef 237 { EMFILE, ALL, "too many open files" }, 238 #endif 239 { ENFILE, ALL, "file table overflow" }, 240 { ENOSPC, ALL, "file system full" }, 241 #ifdef EDQUOT 242 { EDQUOT, ALL, "disk quota exceeded" }, 243 #endif 244 #ifdef ENOSR 245 { ENOSR, ALL, "no streams resources" }, 246 #endif 247 { ENXIO, ALL, "no such device or address" }, 248 { EROFS, ALL, "read-only file system" }, 249 { ETXTBSY, ALL, "text busy" }, 250 #ifdef SYSV 251 { EAGAIN, E_EXEC, "not enough memory" }, 252 #endif 253 { ENOMEM, ALL, "not enough memory" }, 254 #ifdef ENOLINK 255 { ENOLINK, ALL, "remote access failed" }, 256 #endif 257 #ifdef EMULTIHOP 258 { EMULTIHOP, ALL, "remote access failed" }, 259 #endif 260 #ifdef ECOMM 261 { ECOMM, ALL, "remote access failed" }, 262 #endif 263 #ifdef ESTALE 264 { ESTALE, ALL, "remote access failed" }, 265 #endif 266 #ifdef ETIMEDOUT 267 { ETIMEDOUT, ALL, "remote access failed" }, 268 #endif 269 #ifdef ELOOP 270 { ELOOP, ALL, "symbolic link loop" }, 271 #endif 272 { E2BIG, E_EXEC, "argument list too long" }, 273 #ifdef ELIBACC 274 { ELIBACC, E_EXEC, "shared library missing" }, 275 #endif 276 { 0, 0, NULL }, 277 }; 278 279 280 /* 281 * Return a string describing an error. The returned string may be a 282 * pointer to a static buffer that will be overwritten on the next call. 283 * Action describes the operation that got the error. 284 */ 285 286 const char * 287 errmsg(e, action) 288 int e; 289 int action; 290 { 291 struct errname const *ep; 292 static char buf[12]; 293 294 for (ep = errormsg ; ep->errcode ; ep++) { 295 if (ep->errcode == e && (ep->action & action) != 0) 296 return ep->msg; 297 } 298 fmtstr(buf, sizeof buf, "error %d", e); 299 return buf; 300 } 301