1 /* $NetBSD: error.c,v 1.17 1997/07/04 21:01:54 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 #include <sys/cdefs.h> 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 43 #else 44 __RCSID("$NetBSD: error.c,v 1.17 1997/07/04 21:01:54 christos Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 /* 49 * Errors and exceptions. 50 */ 51 52 #include "shell.h" 53 #include "main.h" 54 #include "options.h" 55 #include "output.h" 56 #include "error.h" 57 #include "show.h" 58 #include <signal.h> 59 #include <unistd.h> 60 #include <errno.h> 61 62 63 /* 64 * Code to handle exceptions in C. 65 */ 66 67 struct jmploc *handler; 68 int exception; 69 volatile int suppressint; 70 volatile int intpending; 71 char *commandname; 72 73 74 static void exverror __P((int, char *, va_list)) __attribute__((__noreturn__)); 75 76 /* 77 * Called to raise an exception. Since C doesn't include exceptions, we 78 * just do a longjmp to the exception handler. The type of exception is 79 * stored in the global variable "exception". 80 */ 81 82 void 83 exraise(e) 84 int e; 85 { 86 if (handler == NULL) 87 abort(); 88 exception = e; 89 longjmp(handler->loc, 1); 90 } 91 92 93 /* 94 * Called from trap.c when a SIGINT is received. (If the user specifies 95 * that SIGINT is to be trapped or ignored using the trap builtin, then 96 * this routine is not called.) Suppressint is nonzero when interrupts 97 * are held using the INTOFF macro. The call to _exit is necessary because 98 * there is a short period after a fork before the signal handlers are 99 * set to the appropriate value for the child. (The test for iflag is 100 * just defensive programming.) 101 */ 102 103 void 104 onint() { 105 sigset_t sigset; 106 107 if (suppressint) { 108 intpending++; 109 return; 110 } 111 intpending = 0; 112 sigemptyset(&sigset); 113 sigprocmask(SIG_SETMASK, &sigset, NULL); 114 if (rootshell && iflag) 115 exraise(EXINT); 116 else 117 _exit(128 + SIGINT); 118 } 119 120 121 /* 122 * Exverror is called to raise the error exception. If the first argument 123 * is not NULL then error prints an error message using printf style 124 * formatting. It then raises the error exception. 125 */ 126 static void 127 exverror(cond, msg, ap) 128 int cond; 129 char *msg; 130 va_list ap; 131 { 132 CLEAR_PENDING_INT; 133 INTOFF; 134 135 #ifdef DEBUG 136 if (msg) 137 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 138 else 139 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 140 #endif 141 if (msg) { 142 if (commandname) 143 outfmt(&errout, "%s: ", commandname); 144 doformat(&errout, msg, ap); 145 out2c('\n'); 146 } 147 flushall(); 148 exraise(cond); 149 } 150 151 152 #ifdef __STDC__ 153 void 154 error(char *msg, ...) 155 #else 156 void 157 error(va_alist) 158 va_dcl 159 #endif 160 { 161 #ifndef __STDC__ 162 char *msg; 163 #endif 164 va_list ap; 165 #ifdef __STDC__ 166 va_start(ap, msg); 167 #else 168 va_start(ap); 169 msg = va_arg(ap, char *); 170 #endif 171 exverror(EXERROR, msg, ap); 172 va_end(ap); 173 } 174 175 176 #ifdef __STDC__ 177 void 178 exerror(int cond, char *msg, ...) 179 #else 180 void 181 exerror(va_alist) 182 va_dcl 183 #endif 184 { 185 #ifndef __STDC__ 186 int cond; 187 char *msg; 188 #endif 189 va_list ap; 190 #ifdef __STDC__ 191 va_start(ap, msg); 192 #else 193 va_start(ap); 194 cond = va_arg(ap, int); 195 msg = va_arg(ap, char *); 196 #endif 197 exverror(cond, msg, ap); 198 va_end(ap); 199 } 200 201 202 203 /* 204 * Table of error messages. 205 */ 206 207 struct errname { 208 short errcode; /* error number */ 209 short action; /* operation which encountered the error */ 210 char *msg; /* text describing the error */ 211 }; 212 213 214 #define ALL (E_OPEN|E_CREAT|E_EXEC) 215 216 STATIC const struct errname errormsg[] = { 217 { EINTR, ALL, "interrupted" }, 218 { EACCES, ALL, "permission denied" }, 219 { EIO, ALL, "I/O error" }, 220 { ENOENT, E_OPEN, "no such file" }, 221 { ENOENT, E_CREAT,"directory nonexistent" }, 222 { ENOENT, E_EXEC, "not found" }, 223 { ENOTDIR, E_OPEN, "no such file" }, 224 { ENOTDIR, E_CREAT,"directory nonexistent" }, 225 { ENOTDIR, E_EXEC, "not found" }, 226 { EISDIR, ALL, "is a directory" }, 227 #ifdef notdef 228 { EMFILE, ALL, "too many open files" }, 229 #endif 230 { ENFILE, ALL, "file table overflow" }, 231 { ENOSPC, ALL, "file system full" }, 232 #ifdef EDQUOT 233 { EDQUOT, ALL, "disk quota exceeded" }, 234 #endif 235 #ifdef ENOSR 236 { ENOSR, ALL, "no streams resources" }, 237 #endif 238 { ENXIO, ALL, "no such device or address" }, 239 { EROFS, ALL, "read-only file system" }, 240 { ETXTBSY, ALL, "text busy" }, 241 #ifdef SYSV 242 { EAGAIN, E_EXEC, "not enough memory" }, 243 #endif 244 { ENOMEM, ALL, "not enough memory" }, 245 #ifdef ENOLINK 246 { ENOLINK, ALL, "remote access failed" }, 247 #endif 248 #ifdef EMULTIHOP 249 { EMULTIHOP, ALL, "remote access failed" }, 250 #endif 251 #ifdef ECOMM 252 { ECOMM, ALL, "remote access failed" }, 253 #endif 254 #ifdef ESTALE 255 { ESTALE, ALL, "remote access failed" }, 256 #endif 257 #ifdef ETIMEDOUT 258 { ETIMEDOUT, ALL, "remote access failed" }, 259 #endif 260 #ifdef ELOOP 261 { ELOOP, ALL, "symbolic link loop" }, 262 #endif 263 { E2BIG, E_EXEC, "argument list too long" }, 264 #ifdef ELIBACC 265 { ELIBACC, E_EXEC, "shared library missing" }, 266 #endif 267 { 0, 0, NULL }, 268 }; 269 270 271 /* 272 * Return a string describing an error. The returned string may be a 273 * pointer to a static buffer that will be overwritten on the next call. 274 * Action describes the operation that got the error. 275 */ 276 277 char * 278 errmsg(e, action) 279 int e; 280 int action; 281 { 282 struct errname const *ep; 283 static char buf[12]; 284 285 for (ep = errormsg ; ep->errcode ; ep++) { 286 if (ep->errcode == e && (ep->action & action) != 0) 287 return ep->msg; 288 } 289 fmtstr(buf, sizeof buf, "error %d", e); 290 return buf; 291 } 292