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 * $Id: error.c,v 1.3 1995/05/30 00:07:10 rgrimes Exp $ 37 */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 41 #endif /* not lint */ 42 43 /* 44 * Errors and exceptions. 45 */ 46 47 #include "shell.h" 48 #include "main.h" 49 #include "options.h" 50 #include "output.h" 51 #include "error.h" 52 #include "show.h" 53 #include <signal.h> 54 #include <unistd.h> 55 #include <errno.h> 56 57 58 /* 59 * Code to handle exceptions in C. 60 */ 61 62 struct jmploc *handler; 63 int exception; 64 volatile int suppressint; 65 volatile int intpending; 66 char *commandname; 67 68 69 /* 70 * Called to raise an exception. Since C doesn't include exceptions, we 71 * just do a longjmp to the exception handler. The type of exception is 72 * stored in the global variable "exception". 73 */ 74 75 void 76 exraise(e) 77 int e; 78 { 79 if (handler == NULL) 80 abort(); 81 exception = e; 82 longjmp(handler->loc, 1); 83 } 84 85 86 /* 87 * Called from trap.c when a SIGINT is received. (If the user specifies 88 * that SIGINT is to be trapped or ignored using the trap builtin, then 89 * this routine is not called.) Suppressint is nonzero when interrupts 90 * are held using the INTOFF macro. The call to _exit is necessary because 91 * there is a short period after a fork before the signal handlers are 92 * set to the appropriate value for the child. (The test for iflag is 93 * just defensive programming.) 94 */ 95 96 void 97 onint() { 98 sigset_t sigset; 99 100 if (suppressint) { 101 intpending++; 102 return; 103 } 104 intpending = 0; 105 sigemptyset(&sigset); 106 sigprocmask(SIG_SETMASK, &sigset, NULL); 107 if (rootshell && iflag) 108 exraise(EXINT); 109 else 110 _exit(128 + SIGINT); 111 } 112 113 114 115 void 116 error2(a, b) 117 char *a, *b; 118 { 119 error("%s: %s", a, b); 120 } 121 122 123 /* 124 * Error is called to raise the error exception. If the first argument 125 * is not NULL then error prints an error message using printf style 126 * formatting. It then raises the error exception. 127 */ 128 129 #if __STDC__ 130 void 131 error(char *msg, ...) 132 #else 133 void 134 error(va_alist) 135 va_dcl 136 #endif 137 { 138 #if !__STDC__ 139 char *msg; 140 #endif 141 va_list ap; 142 CLEAR_PENDING_INT; 143 INTOFF; 144 145 #if __STDC__ 146 va_start(ap, msg); 147 #else 148 va_start(ap); 149 msg = va_arg(ap, char *); 150 #endif 151 #ifdef DEBUG 152 if (msg) 153 TRACE(("error(\"%s\") pid=%d\n", msg, getpid())); 154 else 155 TRACE(("error(NULL) pid=%d\n", getpid())); 156 #endif 157 if (msg) { 158 if (commandname) 159 outfmt(&errout, "%s: ", commandname); 160 doformat(&errout, msg, ap); 161 out2c('\n'); 162 } 163 va_end(ap); 164 flushall(); 165 exraise(EXERROR); 166 } 167 168 169 170 /* 171 * Table of error messages. 172 */ 173 174 struct errname { 175 short errcode; /* error number */ 176 short action; /* operation which encountered the error */ 177 char *msg; /* text describing the error */ 178 }; 179 180 181 #define ALL (E_OPEN|E_CREAT|E_EXEC) 182 183 STATIC const struct errname errormsg[] = { 184 { EINTR, ALL, "interrupted" }, 185 { EACCES, ALL, "permission denied" }, 186 { EIO, ALL, "I/O error" }, 187 { ENOENT, E_OPEN, "no such file" }, 188 { ENOENT, E_CREAT,"directory nonexistent" }, 189 { ENOENT, E_EXEC, "not found" }, 190 { ENOTDIR, E_OPEN, "no such file" }, 191 { ENOTDIR, E_CREAT,"directory nonexistent" }, 192 { ENOTDIR, E_EXEC, "not found" }, 193 { EISDIR, ALL, "is a directory" }, 194 #ifdef notdef 195 { EMFILE, ALL, "too many open files" }, 196 #endif 197 { ENFILE, ALL, "file table overflow" }, 198 { ENOSPC, ALL, "file system full" }, 199 #ifdef EDQUOT 200 { EDQUOT, ALL, "disk quota exceeded" }, 201 #endif 202 #ifdef ENOSR 203 { ENOSR, ALL, "no streams resources" }, 204 #endif 205 { ENXIO, ALL, "no such device or address" }, 206 { EROFS, ALL, "read-only file system" }, 207 { ETXTBSY, ALL, "text busy" }, 208 #ifdef SYSV 209 { EAGAIN, E_EXEC, "not enough memory" }, 210 #endif 211 { ENOMEM, ALL, "not enough memory" }, 212 #ifdef ENOLINK 213 { ENOLINK, ALL, "remote access failed" }, 214 #endif 215 #ifdef EMULTIHOP 216 { EMULTIHOP, ALL, "remote access failed" }, 217 #endif 218 #ifdef ECOMM 219 { ECOMM, ALL, "remote access failed" }, 220 #endif 221 #ifdef ESTALE 222 { ESTALE, ALL, "remote access failed" }, 223 #endif 224 #ifdef ETIMEDOUT 225 { ETIMEDOUT, ALL, "remote access failed" }, 226 #endif 227 #ifdef ELOOP 228 { ELOOP, ALL, "symbolic link loop" }, 229 #endif 230 { E2BIG, E_EXEC, "argument list too long" }, 231 #ifdef ELIBACC 232 { ELIBACC, E_EXEC, "shared library missing" }, 233 #endif 234 { 0, 0, NULL }, 235 }; 236 237 238 /* 239 * Return a string describing an error. The returned string may be a 240 * pointer to a static buffer that will be overwritten on the next call. 241 * Action describes the operation that got the error. 242 */ 243 244 char * 245 errmsg(e, action) 246 int e; 247 int action; 248 { 249 struct errname const *ep; 250 static char buf[12]; 251 252 for (ep = errormsg ; ep->errcode ; ep++) { 253 if (ep->errcode == e && (ep->action & action) != 0) 254 return ep->msg; 255 } 256 fmtstr(buf, sizeof buf, "error %d", e); 257 return buf; 258 } 259