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 1.4 1996/09/01 10:19:53 peter 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 /* 116 * Error is called to raise the error exception. If the first argument 117 * is not NULL then error prints an error message using printf style 118 * formatting. It then raises the error exception. 119 */ 120 121 #if __STDC__ 122 void 123 error(char *msg, ...) 124 #else 125 void 126 error(va_alist) 127 va_dcl 128 #endif 129 { 130 #if !__STDC__ 131 char *msg; 132 #endif 133 va_list ap; 134 CLEAR_PENDING_INT; 135 INTOFF; 136 137 #if __STDC__ 138 va_start(ap, msg); 139 #else 140 va_start(ap); 141 msg = va_arg(ap, char *); 142 #endif 143 #ifdef DEBUG 144 if (msg) 145 TRACE(("error(\"%s\") pid=%d\n", msg, getpid())); 146 else 147 TRACE(("error(NULL) pid=%d\n", getpid())); 148 #endif 149 if (msg) { 150 if (commandname) 151 outfmt(&errout, "%s: ", commandname); 152 doformat(&errout, msg, ap); 153 out2c('\n'); 154 } 155 va_end(ap); 156 flushall(); 157 exraise(EXERROR); 158 } 159 160 161 162 /* 163 * Table of error messages. 164 */ 165 166 struct errname { 167 short errcode; /* error number */ 168 short action; /* operation which encountered the error */ 169 char *msg; /* text describing the error */ 170 }; 171 172 173 #define ALL (E_OPEN|E_CREAT|E_EXEC) 174 175 STATIC const struct errname errormsg[] = { 176 { EINTR, ALL, "interrupted" }, 177 { EACCES, ALL, "permission denied" }, 178 { EIO, ALL, "I/O error" }, 179 { ENOENT, E_OPEN, "no such file" }, 180 { ENOENT, E_CREAT,"directory nonexistent" }, 181 { ENOENT, E_EXEC, "not found" }, 182 { ENOTDIR, E_OPEN, "no such file" }, 183 { ENOTDIR, E_CREAT,"directory nonexistent" }, 184 { ENOTDIR, E_EXEC, "not found" }, 185 { EISDIR, ALL, "is a directory" }, 186 #ifdef notdef 187 { EMFILE, ALL, "too many open files" }, 188 #endif 189 { ENFILE, ALL, "file table overflow" }, 190 { ENOSPC, ALL, "file system full" }, 191 #ifdef EDQUOT 192 { EDQUOT, ALL, "disk quota exceeded" }, 193 #endif 194 #ifdef ENOSR 195 { ENOSR, ALL, "no streams resources" }, 196 #endif 197 { ENXIO, ALL, "no such device or address" }, 198 { EROFS, ALL, "read-only file system" }, 199 { ETXTBSY, ALL, "text busy" }, 200 #ifdef SYSV 201 { EAGAIN, E_EXEC, "not enough memory" }, 202 #endif 203 { ENOMEM, ALL, "not enough memory" }, 204 #ifdef ENOLINK 205 { ENOLINK, ALL, "remote access failed" }, 206 #endif 207 #ifdef EMULTIHOP 208 { EMULTIHOP, ALL, "remote access failed" }, 209 #endif 210 #ifdef ECOMM 211 { ECOMM, ALL, "remote access failed" }, 212 #endif 213 #ifdef ESTALE 214 { ESTALE, ALL, "remote access failed" }, 215 #endif 216 #ifdef ETIMEDOUT 217 { ETIMEDOUT, ALL, "remote access failed" }, 218 #endif 219 #ifdef ELOOP 220 { ELOOP, ALL, "symbolic link loop" }, 221 #endif 222 { E2BIG, E_EXEC, "argument list too long" }, 223 #ifdef ELIBACC 224 { ELIBACC, E_EXEC, "shared library missing" }, 225 #endif 226 { 0, 0, NULL }, 227 }; 228 229 230 /* 231 * Return a string describing an error. The returned string may be a 232 * pointer to a static buffer that will be overwritten on the next call. 233 * Action describes the operation that got the error. 234 */ 235 236 char * 237 errmsg(e, action) 238 int e; 239 int action; 240 { 241 struct errname const *ep; 242 static char buf[12]; 243 244 for (ep = errormsg ; ep->errcode ; ep++) { 245 if (ep->errcode == e && (ep->action & action) != 0) 246 return ep->msg; 247 } 248 fmtstr(buf, sizeof buf, "error %d", e); 249 return buf; 250 } 251