1 /* $NetBSD: error.c,v 1.27 2002/09/27 21:32:24 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 1.27 2002/09/27 21:32:24 mycroft 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 #include <stdio.h> 57 58 #include "shell.h" 59 #include "main.h" 60 #include "options.h" 61 #include "output.h" 62 #include "error.h" 63 #include "show.h" 64 65 66 /* 67 * Code to handle exceptions in C. 68 */ 69 70 struct jmploc *handler; 71 int exception; 72 volatile int suppressint; 73 volatile int intpending; 74 char *commandname; 75 76 77 static void exverror __P((int, const char *, va_list)) 78 __attribute__((__noreturn__)); 79 80 /* 81 * Called to raise an exception. Since C doesn't include exceptions, we 82 * just do a longjmp to the exception handler. The type of exception is 83 * stored in the global variable "exception". 84 */ 85 86 void 87 exraise(e) 88 int e; 89 { 90 if (handler == NULL) 91 abort(); 92 exception = e; 93 longjmp(handler->loc, 1); 94 } 95 96 97 /* 98 * Called from trap.c when a SIGINT is received. (If the user specifies 99 * that SIGINT is to be trapped or ignored using the trap builtin, then 100 * this routine is not called.) Suppressint is nonzero when interrupts 101 * are held using the INTOFF macro. The call to _exit is necessary because 102 * there is a short period after a fork before the signal handlers are 103 * set to the appropriate value for the child. (The test for iflag is 104 * just defensive programming.) 105 */ 106 107 void 108 onint() { 109 sigset_t sigset; 110 111 if (suppressint) { 112 intpending++; 113 return; 114 } 115 intpending = 0; 116 sigemptyset(&sigset); 117 sigprocmask(SIG_SETMASK, &sigset, NULL); 118 if (rootshell && iflag) 119 exraise(EXINT); 120 else { 121 signal(SIGINT, SIG_DFL); 122 raise(SIGINT); 123 } 124 /* NOTREACHED */ 125 } 126 127 128 /* 129 * Exverror is called to raise the error exception. If the first argument 130 * is not NULL then error prints an error message using printf style 131 * formatting. It then raises the error exception. 132 */ 133 static void 134 exverror(cond, msg, ap) 135 int cond; 136 const char *msg; 137 va_list ap; 138 { 139 CLEAR_PENDING_INT; 140 INTOFF; 141 142 #ifdef DEBUG 143 if (msg) 144 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 145 else 146 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 147 #endif 148 if (msg) { 149 if (commandname) 150 outfmt(&errout, "%s: ", commandname); 151 doformat(&errout, msg, ap); 152 out2c('\n'); 153 } 154 flushall(); 155 exraise(cond); 156 /* NOTREACHED */ 157 } 158 159 160 void 161 error(const char *msg, ...) 162 { 163 va_list ap; 164 165 va_start(ap, msg); 166 exverror(EXERROR, msg, ap); 167 /* NOTREACHED */ 168 va_end(ap); 169 } 170 171 172 void 173 exerror(int cond, const char *msg, ...) 174 { 175 va_list ap; 176 177 va_start(ap, msg); 178 exverror(cond, msg, ap); 179 /* NOTREACHED */ 180 va_end(ap); 181 } 182 183 184 185 /* 186 * Table of error messages. 187 */ 188 189 struct errname { 190 short errcode; /* error number */ 191 short action; /* operation which encountered the error */ 192 const char *msg; /* text describing the error */ 193 }; 194 195 196 #define ALL (E_OPEN|E_CREAT|E_EXEC) 197 198 STATIC const struct errname errormsg[] = { 199 { EINTR, ALL, "interrupted" }, 200 { EACCES, ALL, "permission denied" }, 201 { EIO, ALL, "I/O error" }, 202 { EEXIST, ALL, "file exists" }, 203 { ENOENT, E_OPEN, "no such file" }, 204 { ENOENT, E_CREAT,"directory nonexistent" }, 205 { ENOENT, E_EXEC, "not found" }, 206 { ENOTDIR, E_OPEN, "no such file" }, 207 { ENOTDIR, E_CREAT,"directory nonexistent" }, 208 { ENOTDIR, E_EXEC, "not found" }, 209 { EISDIR, ALL, "is a directory" }, 210 #ifdef EMFILE 211 { EMFILE, ALL, "too many open files" }, 212 #endif 213 { ENFILE, ALL, "file table overflow" }, 214 { ENOSPC, ALL, "file system full" }, 215 #ifdef EDQUOT 216 { EDQUOT, ALL, "disk quota exceeded" }, 217 #endif 218 #ifdef ENOSR 219 { ENOSR, ALL, "no streams resources" }, 220 #endif 221 { ENXIO, ALL, "no such device or address" }, 222 { EROFS, ALL, "read-only file system" }, 223 { ETXTBSY, ALL, "text busy" }, 224 #ifdef EAGAIN 225 { EAGAIN, E_EXEC, "not enough memory" }, 226 #endif 227 { ENOMEM, ALL, "not enough memory" }, 228 #ifdef ENOLINK 229 { ENOLINK, ALL, "remote access failed" }, 230 #endif 231 #ifdef EMULTIHOP 232 { EMULTIHOP, ALL, "remote access failed" }, 233 #endif 234 #ifdef ECOMM 235 { ECOMM, ALL, "remote access failed" }, 236 #endif 237 #ifdef ESTALE 238 { ESTALE, ALL, "remote access failed" }, 239 #endif 240 #ifdef ETIMEDOUT 241 { ETIMEDOUT, ALL, "remote access failed" }, 242 #endif 243 #ifdef ELOOP 244 { ELOOP, ALL, "symbolic link loop" }, 245 #endif 246 { E2BIG, E_EXEC, "argument list too long" }, 247 #ifdef ELIBACC 248 { ELIBACC, E_EXEC, "shared library missing" }, 249 #endif 250 { 0, 0, NULL }, 251 }; 252 253 254 /* 255 * Return a string describing an error. The returned string may be a 256 * pointer to a static buffer that will be overwritten on the next call. 257 * Action describes the operation that got the error. 258 */ 259 260 const char * 261 errmsg(e, action) 262 int e; 263 int action; 264 { 265 struct errname const *ep; 266 static char buf[12]; 267 268 for (ep = errormsg ; ep->errcode ; ep++) { 269 if (ep->errcode == e && (ep->action & action) != 0) 270 return ep->msg; 271 } 272 fmtstr(buf, sizeof buf, "error %d", e); 273 return buf; 274 } 275