error.c revision 1.15
1 /* $NetBSD: error.c,v 1.15 1996/10/16 14:35:42 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 42 #else 43 static char rcsid[] = "$NetBSD: error.c,v 1.15 1996/10/16 14:35:42 christos Exp $"; 44 #endif 45 #endif /* not lint */ 46 47 /* 48 * Errors and exceptions. 49 */ 50 51 #include "shell.h" 52 #include "main.h" 53 #include "options.h" 54 #include "output.h" 55 #include "error.h" 56 #include "show.h" 57 #include <signal.h> 58 #include <unistd.h> 59 #include <errno.h> 60 61 62 /* 63 * Code to handle exceptions in C. 64 */ 65 66 struct jmploc *handler; 67 int exception; 68 volatile int suppressint; 69 volatile int intpending; 70 char *commandname; 71 72 73 static void exverror __P((int, char *, va_list)); 74 75 /* 76 * Called to raise an exception. Since C doesn't include exceptions, we 77 * just do a longjmp to the exception handler. The type of exception is 78 * stored in the global variable "exception". 79 */ 80 81 void 82 exraise(e) 83 int e; 84 { 85 if (handler == NULL) 86 abort(); 87 exception = e; 88 longjmp(handler->loc, 1); 89 } 90 91 92 /* 93 * Called from trap.c when a SIGINT is received. (If the user specifies 94 * that SIGINT is to be trapped or ignored using the trap builtin, then 95 * this routine is not called.) Suppressint is nonzero when interrupts 96 * are held using the INTOFF macro. The call to _exit is necessary because 97 * there is a short period after a fork before the signal handlers are 98 * set to the appropriate value for the child. (The test for iflag is 99 * just defensive programming.) 100 */ 101 102 void 103 onint() { 104 sigset_t sigset; 105 106 if (suppressint) { 107 intpending++; 108 return; 109 } 110 intpending = 0; 111 sigemptyset(&sigset); 112 sigprocmask(SIG_SETMASK, &sigset, NULL); 113 if (rootshell && iflag) 114 exraise(EXINT); 115 else 116 _exit(128 + SIGINT); 117 } 118 119 120 /* 121 * Exverror is called to raise the error exception. If the first argument 122 * is not NULL then error prints an error message using printf style 123 * formatting. It then raises the error exception. 124 */ 125 static void 126 exverror(cond, msg, ap) 127 int cond; 128 char *msg; 129 va_list ap; 130 { 131 CLEAR_PENDING_INT; 132 INTOFF; 133 134 #ifdef DEBUG 135 if (msg) 136 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 137 else 138 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 139 #endif 140 if (msg) { 141 if (commandname) 142 outfmt(&errout, "%s: ", commandname); 143 doformat(&errout, msg, ap); 144 out2c('\n'); 145 } 146 flushall(); 147 exraise(cond); 148 } 149 150 151 #if __STDC__ 152 void 153 error(char *msg, ...) 154 #else 155 void 156 error(va_alist) 157 va_dcl 158 #endif 159 { 160 #if !__STDC__ 161 char *msg; 162 #endif 163 va_list ap; 164 #if __STDC__ 165 va_start(ap, msg); 166 #else 167 va_start(ap); 168 msg = va_arg(ap, char *); 169 #endif 170 exverror(EXERROR, msg, ap); 171 va_end(ap); 172 } 173 174 175 #if __STDC__ 176 void 177 exerror(int cond, char *msg, ...) 178 #else 179 void 180 exerror(va_alist) 181 va_dcl 182 #endif 183 { 184 #if !__STDC__ 185 int cond; 186 char *msg; 187 #endif 188 va_list ap; 189 #if __STDC__ 190 va_start(ap, msg); 191 #else 192 va_start(ap); 193 cond = va_arg(ap, int); 194 msg = va_arg(ap, char *); 195 #endif 196 exverror(cond, msg, ap); 197 va_end(ap); 198 } 199 200 201 202 /* 203 * Table of error messages. 204 */ 205 206 struct errname { 207 short errcode; /* error number */ 208 short action; /* operation which encountered the error */ 209 char *msg; /* text describing the error */ 210 }; 211 212 213 #define ALL (E_OPEN|E_CREAT|E_EXEC) 214 215 STATIC const struct errname errormsg[] = { 216 { EINTR, ALL, "interrupted" }, 217 { EACCES, ALL, "permission denied" }, 218 { EIO, ALL, "I/O error" }, 219 { ENOENT, E_OPEN, "no such file" }, 220 { ENOENT, E_CREAT,"directory nonexistent" }, 221 { ENOENT, E_EXEC, "not found" }, 222 { ENOTDIR, E_OPEN, "no such file" }, 223 { ENOTDIR, E_CREAT,"directory nonexistent" }, 224 { ENOTDIR, E_EXEC, "not found" }, 225 { EISDIR, ALL, "is a directory" }, 226 #ifdef notdef 227 { EMFILE, ALL, "too many open files" }, 228 #endif 229 { ENFILE, ALL, "file table overflow" }, 230 { ENOSPC, ALL, "file system full" }, 231 #ifdef EDQUOT 232 { EDQUOT, ALL, "disk quota exceeded" }, 233 #endif 234 #ifdef ENOSR 235 { ENOSR, ALL, "no streams resources" }, 236 #endif 237 { ENXIO, ALL, "no such device or address" }, 238 { EROFS, ALL, "read-only file system" }, 239 { ETXTBSY, ALL, "text busy" }, 240 #ifdef SYSV 241 { EAGAIN, E_EXEC, "not enough memory" }, 242 #endif 243 { ENOMEM, ALL, "not enough memory" }, 244 #ifdef ENOLINK 245 { ENOLINK, ALL, "remote access failed" }, 246 #endif 247 #ifdef EMULTIHOP 248 { EMULTIHOP, ALL, "remote access failed" }, 249 #endif 250 #ifdef ECOMM 251 { ECOMM, ALL, "remote access failed" }, 252 #endif 253 #ifdef ESTALE 254 { ESTALE, ALL, "remote access failed" }, 255 #endif 256 #ifdef ETIMEDOUT 257 { ETIMEDOUT, ALL, "remote access failed" }, 258 #endif 259 #ifdef ELOOP 260 { ELOOP, ALL, "symbolic link loop" }, 261 #endif 262 { E2BIG, E_EXEC, "argument list too long" }, 263 #ifdef ELIBACC 264 { ELIBACC, E_EXEC, "shared library missing" }, 265 #endif 266 { 0, 0, NULL }, 267 }; 268 269 270 /* 271 * Return a string describing an error. The returned string may be a 272 * pointer to a static buffer that will be overwritten on the next call. 273 * Action describes the operation that got the error. 274 */ 275 276 char * 277 errmsg(e, action) 278 int e; 279 int action; 280 { 281 struct errname const *ep; 282 static char buf[12]; 283 284 for (ep = errormsg ; ep->errcode ; ep++) { 285 if (ep->errcode == e && (ep->action & action) != 0) 286 return ep->msg; 287 } 288 fmtstr(buf, sizeof buf, "error %d", e); 289 return buf; 290 } 291
Indexes created Mon Sep 22 13:09:51 GMT 2025