error.c revision 36150
1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38#if 0 39static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 40#endif 41static const char rcsid[] = 42 "$Id$"; 43#endif /* not lint */ 44 45/* 46 * Errors and exceptions. 47 */ 48 49#include "shell.h" 50#include "main.h" 51#include "options.h" 52#include "output.h" 53#include "error.h" 54#include "show.h" 55#include <signal.h> 56#include <unistd.h> 57#include <errno.h> 58 59 60/* 61 * Code to handle exceptions in C. 62 */ 63 64struct jmploc *handler; 65int exception; 66volatile int suppressint; 67volatile int intpending; 68char *commandname; 69 70 71static void exverror __P((int, char *, va_list)); 72 73/* 74 * Called to raise an exception. Since C doesn't include exceptions, we 75 * just do a longjmp to the exception handler. The type of exception is 76 * stored in the global variable "exception". 77 */ 78 79void 80exraise(e) 81 int e; 82{ 83 if (handler == NULL) 84 abort(); 85 exception = e; 86 longjmp(handler->loc, 1); 87} 88 89 90/* 91 * Called from trap.c when a SIGINT is received. (If the user specifies 92 * that SIGINT is to be trapped or ignored using the trap builtin, then 93 * this routine is not called.) Suppressint is nonzero when interrupts 94 * are held using the INTOFF macro. The call to _exit is necessary because 95 * there is a short period after a fork before the signal handlers are 96 * set to the appropriate value for the child. (The test for iflag is 97 * just defensive programming.) 98 */ 99 100void 101onint() { 102 sigset_t sigset; 103 104 if (suppressint) { 105 intpending++; 106 return; 107 } 108 intpending = 0; 109 sigemptyset(&sigset); 110 sigprocmask(SIG_SETMASK, &sigset, NULL); 111 out2str("\n"); 112 if (rootshell && iflag) 113 exraise(EXINT); 114 else 115 _exit(128 + SIGINT); 116} 117 118 119/* 120 * Exverror is called to raise the error exception. If the first argument 121 * is not NULL then error prints an error message using printf style 122 * formatting. It then raises the error exception. 123 */ 124static void 125exverror(cond, msg, ap) 126 int cond; 127 char *msg; 128 va_list ap; 129{ 130 CLEAR_PENDING_INT; 131 INTOFF; 132 133#ifdef DEBUG 134 if (msg) 135 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 136 else 137 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 138#endif 139 if (msg) { 140 if (commandname) 141 outfmt(&errout, "%s: ", commandname); 142 doformat(&errout, msg, ap); 143 out2c('\n'); 144 } 145 flushall(); 146 exraise(cond); 147} 148 149 150#ifdef __STDC__ 151void 152error(char *msg, ...) 153#else 154void 155error(va_alist) 156 va_dcl 157#endif 158{ 159#ifndef __STDC__ 160 char *msg; 161#endif 162 va_list ap; 163#ifdef __STDC__ 164 va_start(ap, msg); 165#else 166 va_start(ap); 167 msg = va_arg(ap, char *); 168#endif 169 exverror(EXERROR, msg, ap); 170 va_end(ap); 171} 172 173 174#ifdef __STDC__ 175void 176exerror(int cond, char *msg, ...) 177#else 178void 179exerror(va_alist) 180 va_dcl 181#endif 182{ 183#ifndef __STDC__ 184 int cond; 185 char *msg; 186#endif 187 va_list ap; 188#ifdef __STDC__ 189 va_start(ap, msg); 190#else 191 va_start(ap); 192 cond = va_arg(ap, int); 193 msg = va_arg(ap, char *); 194#endif 195 exverror(cond, msg, ap); 196 va_end(ap); 197} 198 199 200 201/* 202 * Table of error messages. 203 */ 204 205struct errname { 206 short errcode; /* error number */ 207 short action; /* operation which encountered the error */ 208 char *msg; /* text describing the error */ 209}; 210 211 212#define ALL (E_OPEN|E_CREAT|E_EXEC) 213 214STATIC const struct errname errormsg[] = { 215 { EINTR, ALL, "interrupted" }, 216 { EACCES, ALL, "permission denied" }, 217 { EIO, ALL, "I/O error" }, 218 { ENOENT, E_OPEN, "no such file" }, 219 { ENOENT, E_CREAT,"directory nonexistent" }, 220 { ENOENT, E_EXEC, "not found" }, 221 { ENOTDIR, E_OPEN, "no such file" }, 222 { ENOTDIR, E_CREAT,"directory nonexistent" }, 223 { ENOTDIR, E_EXEC, "not found" }, 224 { EISDIR, ALL, "is a directory" }, 225#ifdef notdef 226 { EMFILE, ALL, "too many open files" }, 227#endif 228 { ENFILE, ALL, "file table overflow" }, 229 { ENOSPC, ALL, "file system full" }, 230#ifdef EDQUOT 231 { EDQUOT, ALL, "disk quota exceeded" }, 232#endif 233#ifdef ENOSR 234 { ENOSR, ALL, "no streams resources" }, 235#endif 236 { ENXIO, ALL, "no such device or address" }, 237 { EROFS, ALL, "read-only file system" }, 238 { ETXTBSY, ALL, "text busy" }, 239#ifdef SYSV 240 { EAGAIN, E_EXEC, "not enough memory" }, 241#endif 242 { ENOMEM, ALL, "not enough memory" }, 243#ifdef ENOLINK 244 { ENOLINK, ALL, "remote access failed" }, 245#endif 246#ifdef EMULTIHOP 247 { EMULTIHOP, ALL, "remote access failed" }, 248#endif 249#ifdef ECOMM 250 { ECOMM, ALL, "remote access failed" }, 251#endif 252#ifdef ESTALE 253 { ESTALE, ALL, "remote access failed" }, 254#endif 255#ifdef ETIMEDOUT 256 { ETIMEDOUT, ALL, "remote access failed" }, 257#endif 258#ifdef ELOOP 259 { ELOOP, ALL, "symbolic link loop" }, 260#endif 261 { E2BIG, E_EXEC, "argument list too long" }, 262#ifdef ELIBACC 263 { ELIBACC, E_EXEC, "shared library missing" }, 264#endif 265 { 0, 0, NULL }, 266}; 267 268 269/* 270 * Return a string describing an error. The returned string may be a 271 * pointer to a static buffer that will be overwritten on the next call. 272 * Action describes the operation that got the error. 273 */ 274 275char * 276errmsg(e, action) 277 int e; 278 int action; 279{ 280 struct errname const *ep; 281 static char buf[12]; 282 283 for (ep = errormsg ; ep->errcode ; ep++) { 284 if (ep->errcode == e && (ep->action & action) != 0) 285 return ep->msg; 286 } 287 fmtstr(buf, sizeof buf, "error %d", e); 288 return buf; 289} 290