1 /* $NetBSD: error.c,v 1.25 2002/05/25 23:09:06 wiz 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 1.25 2002/05/25 23:09:06 wiz 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 void 160 error(const char *msg, ...) 161 { 162 va_list ap; 163 164 va_start(ap, msg); 165 exverror(EXERROR, msg, ap); 166 /* NOTREACHED */ 167 va_end(ap); 168 } 169 170 171 void 172 exerror(int cond, const char *msg, ...) 173 { 174 va_list ap; 175 176 va_start(ap, msg); 177 exverror(cond, msg, ap); 178 /* NOTREACHED */ 179 va_end(ap); 180 } 181 182 183 184 /* 185 * Table of error messages. 186 */ 187 188 struct errname { 189 short errcode; /* error number */ 190 short action; /* operation which encountered the error */ 191 const char *msg; /* text describing the error */ 192 }; 193 194 195 #define ALL (E_OPEN|E_CREAT|E_EXEC) 196 197 STATIC const struct errname errormsg[] = { 198 { EINTR, ALL, "interrupted" }, 199 { EACCES, ALL, "permission denied" }, 200 { EIO, ALL, "I/O error" }, 201 { EEXIST, ALL, "file exists" }, 202 { ENOENT, E_OPEN, "no such file" }, 203 { ENOENT, E_CREAT,"directory nonexistent" }, 204 { ENOENT, E_EXEC, "not found" }, 205 { ENOTDIR, E_OPEN, "no such file" }, 206 { ENOTDIR, E_CREAT,"directory nonexistent" }, 207 { ENOTDIR, E_EXEC, "not found" }, 208 { EISDIR, ALL, "is a directory" }, 209 #ifdef notdef 210 { EMFILE, ALL, "too many open files" }, 211 #endif 212 { ENFILE, ALL, "file table overflow" }, 213 { ENOSPC, ALL, "file system full" }, 214 #ifdef EDQUOT 215 { EDQUOT, ALL, "disk quota exceeded" }, 216 #endif 217 #ifdef ENOSR 218 { ENOSR, ALL, "no streams resources" }, 219 #endif 220 { ENXIO, ALL, "no such device or address" }, 221 { EROFS, ALL, "read-only file system" }, 222 { ETXTBSY, ALL, "text busy" }, 223 #ifdef SYSV 224 { EAGAIN, E_EXEC, "not enough memory" }, 225 #endif 226 { ENOMEM, ALL, "not enough memory" }, 227 #ifdef ENOLINK 228 { ENOLINK, ALL, "remote access failed" }, 229 #endif 230 #ifdef EMULTIHOP 231 { EMULTIHOP, ALL, "remote access failed" }, 232 #endif 233 #ifdef ECOMM 234 { ECOMM, ALL, "remote access failed" }, 235 #endif 236 #ifdef ESTALE 237 { ESTALE, ALL, "remote access failed" }, 238 #endif 239 #ifdef ETIMEDOUT 240 { ETIMEDOUT, ALL, "remote access failed" }, 241 #endif 242 #ifdef ELOOP 243 { ELOOP, ALL, "symbolic link loop" }, 244 #endif 245 { E2BIG, E_EXEC, "argument list too long" }, 246 #ifdef ELIBACC 247 { ELIBACC, E_EXEC, "shared library missing" }, 248 #endif 249 { 0, 0, NULL }, 250 }; 251 252 253 /* 254 * Return a string describing an error. The returned string may be a 255 * pointer to a static buffer that will be overwritten on the next call. 256 * Action describes the operation that got the error. 257 */ 258 259 const char * 260 errmsg(e, action) 261 int e; 262 int action; 263 { 264 struct errname const *ep; 265 static char buf[12]; 266 267 for (ep = errormsg ; ep->errcode ; ep++) { 268 if (ep->errcode == e && (ep->action & action) != 0) 269 return ep->msg; 270 } 271 fmtstr(buf, sizeof buf, "error %d", e); 272 return buf; 273 } 274