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 * @(#)error.c 8.2 (Berkeley) 5/4/95 37 * $FreeBSD: src/bin/sh/error.c,v 1.15.2.4 2002/08/27 01:36:28 tjr Exp $ 38 * $DragonFly: src/bin/sh/error.c,v 1.3 2004/03/19 18:39:41 cpressey Exp $ 39 */ 40 41 /* 42 * Errors and exceptions. 43 */ 44 45 #include "shell.h" 46 #include "main.h" 47 #include "options.h" 48 #include "output.h" 49 #include "error.h" 50 #include "eval.h" /* defines commandname */ 51 #include "nodes.h" /* show.h needs nodes.h */ 52 #include "show.h" 53 #include "trap.h" 54 #include <signal.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 #include <errno.h> 58 59 60 /* 61 * Code to handle exceptions in C. 62 */ 63 64 struct jmploc *handler; 65 volatile sig_atomic_t exception; 66 volatile sig_atomic_t suppressint; 67 volatile sig_atomic_t intpending; 68 69 70 static void exverror(int, const char *, va_list) __printf0like(2, 0); 71 72 /* 73 * Called to raise an exception. Since C doesn't include exceptions, we 74 * just do a longjmp to the exception handler. The type of exception is 75 * stored in the global variable "exception". 76 */ 77 78 void 79 exraise(int e) 80 { 81 if (handler == NULL) 82 abort(); 83 exception = e; 84 longjmp(handler->loc, 1); 85 } 86 87 88 /* 89 * Called from trap.c when a SIGINT is received. (If the user specifies 90 * that SIGINT is to be trapped or ignored using the trap builtin, then 91 * this routine is not called.) Suppressint is nonzero when interrupts 92 * are held using the INTOFF macro. If SIGINTs are not suppressed and 93 * the shell is not a root shell, then we want to be terminated if we 94 * get here, as if we were terminated directly by a SIGINT. Arrange for 95 * this here. 96 */ 97 98 void 99 onint(void) 100 { 101 sigset_t sigset; 102 103 /* 104 * The !in_dotrap here is safe. The only way we can arrive here 105 * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL 106 * and killed itself. 107 */ 108 109 if (suppressint && !in_dotrap) { 110 intpending++; 111 return; 112 } 113 intpending = 0; 114 sigemptyset(&sigset); 115 sigprocmask(SIG_SETMASK, &sigset, NULL); 116 117 /* 118 * This doesn't seem to be needed, since main() emits a newline. 119 */ 120 #if 0 121 if (tcgetpgrp(0) == getpid()) 122 write(STDERR_FILENO, "\n", 1); 123 #endif 124 if (rootshell && iflag) 125 exraise(EXINT); 126 else { 127 signal(SIGINT, SIG_DFL); 128 kill(getpid(), SIGINT); 129 } 130 } 131 132 133 /* 134 * Exverror is called to raise the error exception. If the first argument 135 * is not NULL then error prints an error message using printf style 136 * formatting. It then raises the error exception. 137 */ 138 static void 139 exverror(int cond, const char *msg, va_list ap) 140 { 141 CLEAR_PENDING_INT; 142 INTOFF; 143 144 #ifdef DEBUG 145 if (msg) 146 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 147 else 148 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 149 #endif 150 if (msg) { 151 if (commandname) 152 outfmt(&errout, "%s: ", commandname); 153 doformat(&errout, msg, ap); 154 out2c('\n'); 155 } 156 flushall(); 157 exraise(cond); 158 } 159 160 161 void 162 error(const char *msg, ...) 163 { 164 va_list ap; 165 va_start(ap, msg); 166 exverror(EXERROR, msg, ap); 167 va_end(ap); 168 } 169 170 171 void 172 exerror(int cond, const char *msg, ...) 173 { 174 va_list ap; 175 va_start(ap, msg); 176 exverror(cond, msg, ap); 177 va_end(ap); 178 } 179 180 181 182 /* 183 * Table of error messages. 184 */ 185 186 struct errname { 187 short errcode; /* error number */ 188 short action; /* operation which encountered the error */ 189 const char *msg; /* text describing the error */ 190 }; 191 192 193 #define ALL (E_OPEN|E_CREAT|E_EXEC) 194 195 STATIC const struct errname errormsg[] = { 196 { EINTR, ALL, "interrupted" }, 197 { EACCES, ALL, "permission denied" }, 198 { EIO, ALL, "I/O error" }, 199 { ENOENT, E_OPEN, "no such file" }, 200 { ENOENT, E_CREAT,"directory nonexistent" }, 201 { ENOENT, E_EXEC, "not found" }, 202 { ENOTDIR, E_OPEN, "no such file" }, 203 { ENOTDIR, E_CREAT,"directory nonexistent" }, 204 { ENOTDIR, E_EXEC, "not found" }, 205 { EISDIR, ALL, "is a directory" }, 206 #ifdef notdef 207 { EMFILE, ALL, "too many open files" }, 208 #endif 209 { ENFILE, ALL, "file table overflow" }, 210 { ENOSPC, ALL, "file system full" }, 211 #ifdef EDQUOT 212 { EDQUOT, ALL, "disk quota exceeded" }, 213 #endif 214 #ifdef ENOSR 215 { ENOSR, ALL, "no streams resources" }, 216 #endif 217 { ENXIO, ALL, "no such device or address" }, 218 { EROFS, ALL, "read-only file system" }, 219 { ETXTBSY, ALL, "text busy" }, 220 { ENOMEM, ALL, "not enough memory" }, 221 #ifdef ENOLINK 222 { ENOLINK, ALL, "remote access failed" }, 223 #endif 224 #ifdef EMULTIHOP 225 { EMULTIHOP, ALL, "remote access failed" }, 226 #endif 227 #ifdef ECOMM 228 { ECOMM, ALL, "remote access failed" }, 229 #endif 230 #ifdef ESTALE 231 { ESTALE, ALL, "remote access failed" }, 232 #endif 233 #ifdef ETIMEDOUT 234 { ETIMEDOUT, ALL, "remote access failed" }, 235 #endif 236 #ifdef ELOOP 237 { ELOOP, ALL, "symbolic link loop" }, 238 #endif 239 { E2BIG, E_EXEC, "argument list too long" }, 240 #ifdef ELIBACC 241 { ELIBACC, E_EXEC, "shared library missing" }, 242 #endif 243 { EEXIST, E_CREAT, "file exists" }, 244 { 0, 0, NULL }, 245 }; 246 247 248 /* 249 * Return a string describing an error. The returned string may be a 250 * pointer to a static buffer that will be overwritten on the next call. 251 * Action describes the operation that got the error. 252 */ 253 254 const char * 255 errmsg(int e, int action) 256 { 257 struct errname const *ep; 258 static char buf[12]; 259 260 for (ep = errormsg ; ep->errcode ; ep++) { 261 if (ep->errcode == e && (ep->action & action) != 0) 262 return ep->msg; 263 } 264 fmtstr(buf, sizeof buf, "error %d", e); 265 return buf; 266 } 267