error.c revision 1.21
1 /* $NetBSD: error.c,v 1.21 1999/04/05 15:00:28 mycroft 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 1.21 1999/04/05 15:00:28 mycroft Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 /* 49 * Errors and exceptions. 50 */ 51 52 #include <signal.h> 53 #include <unistd.h> 54 #include <errno.h> 55 56 #include "shell.h" 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 char *commandname; 73 74 75 static void exverror __P((int, char *, va_list)) __attribute__((__noreturn__)); 76 77 /* 78 * Called to raise an exception. Since C doesn't include exceptions, we 79 * just do a longjmp to the exception handler. The type of exception is 80 * stored in the global variable "exception". 81 */ 82 83 void 84 exraise(e) 85 int e; 86 { 87 if (handler == NULL) 88 abort(); 89 exception = e; 90 longjmp(handler->loc, 1); 91 } 92 93 94 /* 95 * Called from trap.c when a SIGINT is received. (If the user specifies 96 * that SIGINT is to be trapped or ignored using the trap builtin, then 97 * this routine is not called.) Suppressint is nonzero when interrupts 98 * are held using the INTOFF macro. The call to _exit is necessary because 99 * there is a short period after a fork before the signal handlers are 100 * set to the appropriate value for the child. (The test for iflag is 101 * just defensive programming.) 102 */ 103 104 void 105 onint() { 106 sigset_t sigset; 107 108 if (suppressint) { 109 intpending++; 110 return; 111 } 112 intpending = 0; 113 sigemptyset(&sigset); 114 sigprocmask(SIG_SETMASK, &sigset, NULL); 115 if (rootshell && iflag) 116 exraise(EXINT); 117 else { 118 signal(SIGINT, SIG_DFL); 119 raise(SIGINT); 120 } 121 /* NOTREACHED */ 122 } 123 124 125 /* 126 * Exverror is called to raise the error exception. If the first argument 127 * is not NULL then error prints an error message using printf style 128 * formatting. It then raises the error exception. 129 */ 130 static void 131 exverror(cond, msg, ap) 132 int cond; 133 char *msg; 134 va_list ap; 135 { 136 CLEAR_PENDING_INT; 137 INTOFF; 138 139 #ifdef DEBUG 140 if (msg) 141 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 142 else 143 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 144 #endif 145 if (msg) { 146 if (commandname) 147 outfmt(&errout, "%s: ", commandname); 148 doformat(&errout, msg, ap); 149 out2c('\n'); 150 } 151 flushall(); 152 exraise(cond); 153 /* NOTREACHED */ 154 } 155 156 157 #ifdef __STDC__ 158 void 159 error(char *msg, ...) 160 #else 161 void 162 error(va_alist) 163 va_dcl 164 #endif 165 { 166 #ifndef __STDC__ 167 char *msg; 168 #endif 169 va_list ap; 170 #ifdef __STDC__ 171 va_start(ap, msg); 172 #else 173 va_start(ap); 174 msg = va_arg(ap, char *); 175 #endif 176 exverror(EXERROR, msg, ap); 177 /* NOTREACHED */ 178 va_end(ap); 179 } 180 181 182 #ifdef __STDC__ 183 void 184 exerror(int cond, char *msg, ...) 185 #else 186 void 187 exerror(va_alist) 188 va_dcl 189 #endif 190 { 191 #ifndef __STDC__ 192 int cond; 193 char *msg; 194 #endif 195 va_list ap; 196 #ifdef __STDC__ 197 va_start(ap, msg); 198 #else 199 va_start(ap); 200 cond = va_arg(ap, int); 201 msg = va_arg(ap, char *); 202 #endif 203 exverror(cond, msg, ap); 204 /* NOTREACHED */ 205 va_end(ap); 206 } 207 208 209 210 /* 211 * Table of error messages. 212 */ 213 214 struct errname { 215 short errcode; /* error number */ 216 short action; /* operation which encountered the error */ 217 char *msg; /* text describing the error */ 218 }; 219 220 221 #define ALL (E_OPEN|E_CREAT|E_EXEC) 222 223 STATIC const struct errname errormsg[] = { 224 { EINTR, ALL, "interrupted" }, 225 { EACCES, ALL, "permission denied" }, 226 { EIO, ALL, "I/O error" }, 227 { ENOENT, E_OPEN, "no such file" }, 228 { ENOENT, E_CREAT,"directory nonexistent" }, 229 { ENOENT, E_EXEC, "not found" }, 230 { ENOTDIR, E_OPEN, "no such file" }, 231 { ENOTDIR, E_CREAT,"directory nonexistent" }, 232 { ENOTDIR, E_EXEC, "not found" }, 233 { EISDIR, ALL, "is a directory" }, 234 #ifdef notdef 235 { EMFILE, ALL, "too many open files" }, 236 #endif 237 { ENFILE, ALL, "file table overflow" }, 238 { ENOSPC, ALL, "file system full" }, 239 #ifdef EDQUOT 240 { EDQUOT, ALL, "disk quota exceeded" }, 241 #endif 242 #ifdef ENOSR 243 { ENOSR, ALL, "no streams resources" }, 244 #endif 245 { ENXIO, ALL, "no such device or address" }, 246 { EROFS, ALL, "read-only file system" }, 247 { ETXTBSY, ALL, "text busy" }, 248 #ifdef SYSV 249 { EAGAIN, E_EXEC, "not enough memory" }, 250 #endif 251 { ENOMEM, ALL, "not enough memory" }, 252 #ifdef ENOLINK 253 { ENOLINK, ALL, "remote access failed" }, 254 #endif 255 #ifdef EMULTIHOP 256 { EMULTIHOP, ALL, "remote access failed" }, 257 #endif 258 #ifdef ECOMM 259 { ECOMM, ALL, "remote access failed" }, 260 #endif 261 #ifdef ESTALE 262 { ESTALE, ALL, "remote access failed" }, 263 #endif 264 #ifdef ETIMEDOUT 265 { ETIMEDOUT, ALL, "remote access failed" }, 266 #endif 267 #ifdef ELOOP 268 { ELOOP, ALL, "symbolic link loop" }, 269 #endif 270 { E2BIG, E_EXEC, "argument list too long" }, 271 #ifdef ELIBACC 272 { ELIBACC, E_EXEC, "shared library missing" }, 273 #endif 274 { 0, 0, NULL }, 275 }; 276 277 278 /* 279 * Return a string describing an error. The returned string may be a 280 * pointer to a static buffer that will be overwritten on the next call. 281 * Action describes the operation that got the error. 282 */ 283 284 char * 285 errmsg(e, action) 286 int e; 287 int action; 288 { 289 struct errname const *ep; 290 static char buf[12]; 291 292 for (ep = errormsg ; ep->errcode ; ep++) { 293 if (ep->errcode == e && (ep->action & action) != 0) 294 return ep->msg; 295 } 296 fmtstr(buf, sizeof buf, "error %d", e); 297 return buf; 298 } 299
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