error.c revision 50471
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 50471 1999-08-27 23:15:48Z peter $"; 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 "trap.h" 56#include <signal.h> 57#include <unistd.h> 58#include <errno.h> 59 60 61/* 62 * Code to handle exceptions in C. 63 */ 64 65struct jmploc *handler; 66volatile sig_atomic_t exception; 67volatile sig_atomic_t suppressint; 68volatile sig_atomic_t intpending; 69char *commandname; 70 71 72static void exverror __P((int, char *, va_list)); 73 74/* 75 * Called to raise an exception. Since C doesn't include exceptions, we 76 * just do a longjmp to the exception handler. The type of exception is 77 * stored in the global variable "exception". 78 */ 79 80void 81exraise(e) 82 int e; 83{ 84 if (handler == NULL) 85 abort(); 86 exception = e; 87 longjmp(handler->loc, 1); 88} 89 90 91/* 92 * Called from trap.c when a SIGINT is received. (If the user specifies 93 * that SIGINT is to be trapped or ignored using the trap builtin, then 94 * this routine is not called.) Suppressint is nonzero when interrupts 95 * are held using the INTOFF macro. If SIGINTs are not suppressed and 96 * the shell is not a root shell, then we want to be terminated if we 97 * get here, as if we were terminated directly by a SIGINT. Arrange for 98 * this here. 99 */ 100 101void 102onint() { 103 sigset_t sigset; 104 105 /* 106 * The !in_dotrap here is safe. The only way we can arrive here 107 * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL 108 * and killed itself. 109 */ 110 111 if (suppressint && !in_dotrap) { 112 intpending++; 113 return; 114 } 115 intpending = 0; 116 sigemptyset(&sigset); 117 sigprocmask(SIG_SETMASK, &sigset, NULL); 118 119 /* 120 * This doesn't seem to be needed, since main() emits a newline. 121 */ 122#if 0 123 if (tcgetpgrp(0) == getpid()) 124 write(STDERR_FILENO, "\n", 1); 125#endif 126 if (rootshell && iflag) 127 exraise(EXINT); 128 else { 129 signal(SIGINT, SIG_DFL); 130 kill(getpid(), SIGINT); 131 } 132} 133 134 135/* 136 * Exverror is called to raise the error exception. If the first argument 137 * is not NULL then error prints an error message using printf style 138 * formatting. It then raises the error exception. 139 */ 140static void 141exverror(cond, msg, ap) 142 int cond; 143 char *msg; 144 va_list ap; 145{ 146 CLEAR_PENDING_INT; 147 INTOFF; 148 149#ifdef DEBUG 150 if (msg) 151 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 152 else 153 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 154#endif 155 if (msg) { 156 if (commandname) 157 outfmt(&errout, "%s: ", commandname); 158 doformat(&errout, msg, ap); 159 out2c('\n'); 160 } 161 flushall(); 162 exraise(cond); 163} 164 165 166#ifdef __STDC__ 167void 168error(char *msg, ...) 169#else 170void 171error(va_alist) 172 va_dcl 173#endif 174{ 175#ifndef __STDC__ 176 char *msg; 177#endif 178 va_list ap; 179#ifdef __STDC__ 180 va_start(ap, msg); 181#else 182 va_start(ap); 183 msg = va_arg(ap, char *); 184#endif 185 exverror(EXERROR, msg, ap); 186 va_end(ap); 187} 188 189 190#ifdef __STDC__ 191void 192exerror(int cond, char *msg, ...) 193#else 194void 195exerror(va_alist) 196 va_dcl 197#endif 198{ 199#ifndef __STDC__ 200 int cond; 201 char *msg; 202#endif 203 va_list ap; 204#ifdef __STDC__ 205 va_start(ap, msg); 206#else 207 va_start(ap); 208 cond = va_arg(ap, int); 209 msg = va_arg(ap, char *); 210#endif 211 exverror(cond, msg, ap); 212 va_end(ap); 213} 214 215 216 217/* 218 * Table of error messages. 219 */ 220 221struct errname { 222 short errcode; /* error number */ 223 short action; /* operation which encountered the error */ 224 char *msg; /* text describing the error */ 225}; 226 227 228#define ALL (E_OPEN|E_CREAT|E_EXEC) 229 230STATIC const struct errname errormsg[] = { 231 { EINTR, ALL, "interrupted" }, 232 { EACCES, ALL, "permission denied" }, 233 { EIO, ALL, "I/O error" }, 234 { ENOENT, E_OPEN, "no such file" }, 235 { ENOENT, E_CREAT,"directory nonexistent" }, 236 { ENOENT, E_EXEC, "not found" }, 237 { ENOTDIR, E_OPEN, "no such file" }, 238 { ENOTDIR, E_CREAT,"directory nonexistent" }, 239 { ENOTDIR, E_EXEC, "not found" }, 240 { EISDIR, ALL, "is a directory" }, 241#ifdef notdef 242 { EMFILE, ALL, "too many open files" }, 243#endif 244 { ENFILE, ALL, "file table overflow" }, 245 { ENOSPC, ALL, "file system full" }, 246#ifdef EDQUOT 247 { EDQUOT, ALL, "disk quota exceeded" }, 248#endif 249#ifdef ENOSR 250 { ENOSR, ALL, "no streams resources" }, 251#endif 252 { ENXIO, ALL, "no such device or address" }, 253 { EROFS, ALL, "read-only file system" }, 254 { ETXTBSY, ALL, "text busy" }, 255#ifdef SYSV 256 { EAGAIN, E_EXEC, "not enough memory" }, 257#endif 258 { ENOMEM, ALL, "not enough memory" }, 259#ifdef ENOLINK 260 { ENOLINK, ALL, "remote access failed" }, 261#endif 262#ifdef EMULTIHOP 263 { EMULTIHOP, ALL, "remote access failed" }, 264#endif 265#ifdef ECOMM 266 { ECOMM, ALL, "remote access failed" }, 267#endif 268#ifdef ESTALE 269 { ESTALE, ALL, "remote access failed" }, 270#endif 271#ifdef ETIMEDOUT 272 { ETIMEDOUT, ALL, "remote access failed" }, 273#endif 274#ifdef ELOOP 275 { ELOOP, ALL, "symbolic link loop" }, 276#endif 277 { E2BIG, E_EXEC, "argument list too long" }, 278#ifdef ELIBACC 279 { ELIBACC, E_EXEC, "shared library missing" }, 280#endif 281 { 0, 0, NULL }, 282}; 283 284 285/* 286 * Return a string describing an error. The returned string may be a 287 * pointer to a static buffer that will be overwritten on the next call. 288 * Action describes the operation that got the error. 289 */ 290 291char * 292errmsg(e, action) 293 int e; 294 int action; 295{ 296 struct errname const *ep; 297 static char buf[12]; 298 299 for (ep = errormsg ; ep->errcode ; ep++) { 300 if (ep->errcode == e && (ep->action & action) != 0) 301 return ep->msg; 302 } 303 fmtstr(buf, sizeof buf, "error %d", e); 304 return buf; 305} 306