error.c revision 38530
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: error.c,v 1.11 1998/08/24 10:20:36 cracauer Exp $"; 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.) Supressint 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 /* The !in_dotrap is save. The only way we can arrive here with 106 * in_dotrap set is that a trap handler set SIGINT to default 107 * and killed itself. 108 */ 109 110 if (suppressint && !in_dotrap) { 111 intpending++; 112 return; 113 } 114 intpending = 0; 115 sigemptyset(&sigset); 116 sigprocmask(SIG_SETMASK, &sigset, NULL); 117 118 /* This doesn't seem to be needed. Note that main emit a newline 119 * as well. 120 */ 121#if 0 122 if (tcgetpgrp(0) == getpid()) 123 write(STDERR_FILENO, "\n", 1); 124#endif 125 if (rootshell && iflag) 126 exraise(EXINT); 127 else { 128 signal(SIGINT, SIG_DFL); 129 kill(getpid(), SIGINT); 130 } 131} 132 133 134/* 135 * Exverror is called to raise the error exception. If the first argument 136 * is not NULL then error prints an error message using printf style 137 * formatting. It then raises the error exception. 138 */ 139static void 140exverror(cond, msg, ap) 141 int cond; 142 char *msg; 143 va_list ap; 144{ 145 CLEAR_PENDING_INT; 146 INTOFF; 147 148#ifdef DEBUG 149 if (msg) 150 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 151 else 152 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 153#endif 154 if (msg) { 155 if (commandname) 156 outfmt(&errout, "%s: ", commandname); 157 doformat(&errout, msg, ap); 158 out2c('\n'); 159 } 160 flushall(); 161 exraise(cond); 162} 163 164 165#ifdef __STDC__ 166void 167error(char *msg, ...) 168#else 169void 170error(va_alist) 171 va_dcl 172#endif 173{ 174#ifndef __STDC__ 175 char *msg; 176#endif 177 va_list ap; 178#ifdef __STDC__ 179 va_start(ap, msg); 180#else 181 va_start(ap); 182 msg = va_arg(ap, char *); 183#endif 184 exverror(EXERROR, msg, ap); 185 va_end(ap); 186} 187 188 189#ifdef __STDC__ 190void 191exerror(int cond, char *msg, ...) 192#else 193void 194exerror(va_alist) 195 va_dcl 196#endif 197{ 198#ifndef __STDC__ 199 int cond; 200 char *msg; 201#endif 202 va_list ap; 203#ifdef __STDC__ 204 va_start(ap, msg); 205#else 206 va_start(ap); 207 cond = va_arg(ap, int); 208 msg = va_arg(ap, char *); 209#endif 210 exverror(cond, msg, ap); 211 va_end(ap); 212} 213 214 215 216/* 217 * Table of error messages. 218 */ 219 220struct errname { 221 short errcode; /* error number */ 222 short action; /* operation which encountered the error */ 223 char *msg; /* text describing the error */ 224}; 225 226 227#define ALL (E_OPEN|E_CREAT|E_EXEC) 228 229STATIC const struct errname errormsg[] = { 230 { EINTR, ALL, "interrupted" }, 231 { EACCES, ALL, "permission denied" }, 232 { EIO, ALL, "I/O error" }, 233 { ENOENT, E_OPEN, "no such file" }, 234 { ENOENT, E_CREAT,"directory nonexistent" }, 235 { ENOENT, E_EXEC, "not found" }, 236 { ENOTDIR, E_OPEN, "no such file" }, 237 { ENOTDIR, E_CREAT,"directory nonexistent" }, 238 { ENOTDIR, E_EXEC, "not found" }, 239 { EISDIR, ALL, "is a directory" }, 240#ifdef notdef 241 { EMFILE, ALL, "too many open files" }, 242#endif 243 { ENFILE, ALL, "file table overflow" }, 244 { ENOSPC, ALL, "file system full" }, 245#ifdef EDQUOT 246 { EDQUOT, ALL, "disk quota exceeded" }, 247#endif 248#ifdef ENOSR 249 { ENOSR, ALL, "no streams resources" }, 250#endif 251 { ENXIO, ALL, "no such device or address" }, 252 { EROFS, ALL, "read-only file system" }, 253 { ETXTBSY, ALL, "text busy" }, 254#ifdef SYSV 255 { EAGAIN, E_EXEC, "not enough memory" }, 256#endif 257 { ENOMEM, ALL, "not enough memory" }, 258#ifdef ENOLINK 259 { ENOLINK, ALL, "remote access failed" }, 260#endif 261#ifdef EMULTIHOP 262 { EMULTIHOP, ALL, "remote access failed" }, 263#endif 264#ifdef ECOMM 265 { ECOMM, ALL, "remote access failed" }, 266#endif 267#ifdef ESTALE 268 { ESTALE, ALL, "remote access failed" }, 269#endif 270#ifdef ETIMEDOUT 271 { ETIMEDOUT, ALL, "remote access failed" }, 272#endif 273#ifdef ELOOP 274 { ELOOP, ALL, "symbolic link loop" }, 275#endif 276 { E2BIG, E_EXEC, "argument list too long" }, 277#ifdef ELIBACC 278 { ELIBACC, E_EXEC, "shared library missing" }, 279#endif 280 { 0, 0, NULL }, 281}; 282 283 284/* 285 * Return a string describing an error. The returned string may be a 286 * pointer to a static buffer that will be overwritten on the next call. 287 * Action describes the operation that got the error. 288 */ 289 290char * 291errmsg(e, action) 292 int e; 293 int action; 294{ 295 struct errname const *ep; 296 static char buf[12]; 297 298 for (ep = errormsg ; ep->errcode ; ep++) { 299 if (ep->errcode == e && (ep->action & action) != 0) 300 return ep->msg; 301 } 302 fmtstr(buf, sizeof buf, "error %d", e); 303 return buf; 304} 305