error.c revision 75577
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 "$FreeBSD: head/bin/sh/error.c 75577 2001-04-17 07:46:38Z kris $"; 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 "nodes.h" /* show.h needs nodes.h */ 55#include "show.h" 56#include "trap.h" 57#include <signal.h> 58#include <unistd.h> 59#include <errno.h> 60 61 62/* 63 * Code to handle exceptions in C. 64 */ 65 66struct jmploc *handler; 67volatile sig_atomic_t exception; 68volatile sig_atomic_t suppressint; 69volatile sig_atomic_t intpending; 70char *commandname; 71 72 73static void exverror __P((int, const char *, va_list)) __printf0like(2, 0); 74 75/* 76 * Called to raise an exception. Since C doesn't include exceptions, we 77 * just do a longjmp to the exception handler. The type of exception is 78 * stored in the global variable "exception". 79 */ 80 81void 82exraise(e) 83 int e; 84{ 85 if (handler == NULL) 86 abort(); 87 exception = e; 88 longjmp(handler->loc, 1); 89} 90 91 92/* 93 * Called from trap.c when a SIGINT is received. (If the user specifies 94 * that SIGINT is to be trapped or ignored using the trap builtin, then 95 * this routine is not called.) Suppressint is nonzero when interrupts 96 * are held using the INTOFF macro. If SIGINTs are not suppressed and 97 * the shell is not a root shell, then we want to be terminated if we 98 * get here, as if we were terminated directly by a SIGINT. Arrange for 99 * this here. 100 */ 101 102void 103onint() { 104 sigset_t sigset; 105 106 /* 107 * The !in_dotrap here is safe. The only way we can arrive here 108 * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL 109 * and killed itself. 110 */ 111 112 if (suppressint && !in_dotrap) { 113 intpending++; 114 return; 115 } 116 intpending = 0; 117 sigemptyset(&sigset); 118 sigprocmask(SIG_SETMASK, &sigset, NULL); 119 120 /* 121 * This doesn't seem to be needed, since main() emits a newline. 122 */ 123#if 0 124 if (tcgetpgrp(0) == getpid()) 125 write(STDERR_FILENO, "\n", 1); 126#endif 127 if (rootshell && iflag) 128 exraise(EXINT); 129 else { 130 signal(SIGINT, SIG_DFL); 131 kill(getpid(), SIGINT); 132 } 133} 134 135 136/* 137 * Exverror is called to raise the error exception. If the first argument 138 * is not NULL then error prints an error message using printf style 139 * formatting. It then raises the error exception. 140 */ 141static void 142exverror(cond, msg, ap) 143 int cond; 144 const char *msg; 145 va_list ap; 146{ 147 CLEAR_PENDING_INT; 148 INTOFF; 149 150#ifdef DEBUG 151 if (msg) 152 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 153 else 154 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 155#endif 156 if (msg) { 157 if (commandname) 158 outfmt(&errout, "%s: ", commandname); 159 doformat(&errout, msg, ap); 160 out2c('\n'); 161 } 162 flushall(); 163 exraise(cond); 164} 165 166 167#ifdef __STDC__ 168void 169error(const char *msg, ...) 170#else 171void 172error(va_alist) 173 va_dcl 174#endif 175{ 176#ifndef __STDC__ 177 const char *msg; 178#endif 179 va_list ap; 180#ifdef __STDC__ 181 va_start(ap, msg); 182#else 183 va_start(ap); 184 msg = va_arg(ap, char *); 185#endif 186 exverror(EXERROR, msg, ap); 187 va_end(ap); 188} 189 190 191#ifdef __STDC__ 192void 193exerror(int cond, const char *msg, ...) 194#else 195void 196exerror(va_alist) 197 va_dcl 198#endif 199{ 200#ifndef __STDC__ 201 int cond; 202 char *msg; 203#endif 204 va_list ap; 205#ifdef __STDC__ 206 va_start(ap, msg); 207#else 208 va_start(ap); 209 cond = va_arg(ap, int); 210 msg = va_arg(ap, char *); 211#endif 212 exverror(cond, msg, ap); 213 va_end(ap); 214} 215 216 217 218/* 219 * Table of error messages. 220 */ 221 222struct errname { 223 short errcode; /* error number */ 224 short action; /* operation which encountered the error */ 225 char *msg; /* text describing the error */ 226}; 227 228 229#define ALL (E_OPEN|E_CREAT|E_EXEC) 230 231STATIC const struct errname errormsg[] = { 232 { EINTR, ALL, "interrupted" }, 233 { EACCES, ALL, "permission denied" }, 234 { EIO, ALL, "I/O error" }, 235 { ENOENT, E_OPEN, "no such file" }, 236 { ENOENT, E_CREAT,"directory nonexistent" }, 237 { ENOENT, E_EXEC, "not found" }, 238 { ENOTDIR, E_OPEN, "no such file" }, 239 { ENOTDIR, E_CREAT,"directory nonexistent" }, 240 { ENOTDIR, E_EXEC, "not found" }, 241 { EISDIR, ALL, "is a directory" }, 242#ifdef notdef 243 { EMFILE, ALL, "too many open files" }, 244#endif 245 { ENFILE, ALL, "file table overflow" }, 246 { ENOSPC, ALL, "file system full" }, 247#ifdef EDQUOT 248 { EDQUOT, ALL, "disk quota exceeded" }, 249#endif 250#ifdef ENOSR 251 { ENOSR, ALL, "no streams resources" }, 252#endif 253 { ENXIO, ALL, "no such device or address" }, 254 { EROFS, ALL, "read-only file system" }, 255 { ETXTBSY, ALL, "text busy" }, 256#ifdef SYSV 257 { EAGAIN, E_EXEC, "not enough memory" }, 258#endif 259 { ENOMEM, ALL, "not enough memory" }, 260#ifdef ENOLINK 261 { ENOLINK, ALL, "remote access failed" }, 262#endif 263#ifdef EMULTIHOP 264 { EMULTIHOP, ALL, "remote access failed" }, 265#endif 266#ifdef ECOMM 267 { ECOMM, ALL, "remote access failed" }, 268#endif 269#ifdef ESTALE 270 { ESTALE, ALL, "remote access failed" }, 271#endif 272#ifdef ETIMEDOUT 273 { ETIMEDOUT, ALL, "remote access failed" }, 274#endif 275#ifdef ELOOP 276 { ELOOP, ALL, "symbolic link loop" }, 277#endif 278 { E2BIG, E_EXEC, "argument list too long" }, 279#ifdef ELIBACC 280 { ELIBACC, E_EXEC, "shared library missing" }, 281#endif 282 { 0, 0, NULL }, 283}; 284 285 286/* 287 * Return a string describing an error. The returned string may be a 288 * pointer to a static buffer that will be overwritten on the next call. 289 * Action describes the operation that got the error. 290 */ 291 292char * 293errmsg(e, action) 294 int e; 295 int action; 296{ 297 struct errname const *ep; 298 static char buf[12]; 299 300 for (ep = errormsg ; ep->errcode ; ep++) { 301 if (ep->errcode == e && (ep->action & action) != 0) 302 return ep->msg; 303 } 304 fmtstr(buf, sizeof buf, "error %d", e); 305 return buf; 306} 307