1 /* $NetBSD: error.c,v 1.14 1995/05/11 21:28:51 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 1.14 1995/05/11 21:28:51 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 /* 74 * Called to raise an exception. Since C doesn't include exceptions, we 75 * just do a longjmp to the exception handler. The type of exception is 76 * stored in the global variable "exception". 77 */ 78 79 void 80 exraise(e) 81 int e; 82 { 83 if (handler == NULL) 84 abort(); 85 exception = e; 86 longjmp(handler->loc, 1); 87 } 88 89 90 /* 91 * Called from trap.c when a SIGINT is received. (If the user specifies 92 * that SIGINT is to be trapped or ignored using the trap builtin, then 93 * this routine is not called.) Suppressint is nonzero when interrupts 94 * are held using the INTOFF macro. The call to _exit is necessary because 95 * there is a short period after a fork before the signal handlers are 96 * set to the appropriate value for the child. (The test for iflag is 97 * just defensive programming.) 98 */ 99 100 void 101 onint() { 102 sigset_t sigset; 103 104 if (suppressint) { 105 intpending++; 106 return; 107 } 108 intpending = 0; 109 sigemptyset(&sigset); 110 sigprocmask(SIG_SETMASK, &sigset, NULL); 111 if (rootshell && iflag) 112 exraise(EXINT); 113 else 114 _exit(128 + SIGINT); 115 } 116 117 118 119 void 120 error2(a, b) 121 char *a, *b; 122 { 123 error("%s: %s", a, b); 124 } 125 126 127 /* 128 * Error is called to raise the error exception. If the first argument 129 * is not NULL then error prints an error message using printf style 130 * formatting. It then raises the error exception. 131 */ 132 133 #if __STDC__ 134 void 135 error(char *msg, ...) 136 #else 137 void 138 error(va_alist) 139 va_dcl 140 #endif 141 { 142 #if !__STDC__ 143 char *msg; 144 #endif 145 va_list ap; 146 CLEAR_PENDING_INT; 147 INTOFF; 148 149 #if __STDC__ 150 va_start(ap, msg); 151 #else 152 va_start(ap); 153 msg = va_arg(ap, char *); 154 #endif 155 #ifdef DEBUG 156 if (msg) 157 TRACE(("error(\"%s\") pid=%d\n", msg, getpid())); 158 else 159 TRACE(("error(NULL) pid=%d\n", getpid())); 160 #endif 161 if (msg) { 162 if (commandname) 163 outfmt(&errout, "%s: ", commandname); 164 doformat(&errout, msg, ap); 165 out2c('\n'); 166 } 167 va_end(ap); 168 flushall(); 169 exraise(EXERROR); 170 } 171 172 173 174 /* 175 * Table of error messages. 176 */ 177 178 struct errname { 179 short errcode; /* error number */ 180 short action; /* operation which encountered the error */ 181 char *msg; /* text describing the error */ 182 }; 183 184 185 #define ALL (E_OPEN|E_CREAT|E_EXEC) 186 187 STATIC const struct errname errormsg[] = { 188 { EINTR, ALL, "interrupted" }, 189 { EACCES, ALL, "permission denied" }, 190 { EIO, ALL, "I/O error" }, 191 { ENOENT, E_OPEN, "no such file" }, 192 { ENOENT, E_CREAT,"directory nonexistent" }, 193 { ENOENT, E_EXEC, "not found" }, 194 { ENOTDIR, E_OPEN, "no such file" }, 195 { ENOTDIR, E_CREAT,"directory nonexistent" }, 196 { ENOTDIR, E_EXEC, "not found" }, 197 { EISDIR, ALL, "is a directory" }, 198 #ifdef notdef 199 { EMFILE, ALL, "too many open files" }, 200 #endif 201 { ENFILE, ALL, "file table overflow" }, 202 { ENOSPC, ALL, "file system full" }, 203 #ifdef EDQUOT 204 { EDQUOT, ALL, "disk quota exceeded" }, 205 #endif 206 #ifdef ENOSR 207 { ENOSR, ALL, "no streams resources" }, 208 #endif 209 { ENXIO, ALL, "no such device or address" }, 210 { EROFS, ALL, "read-only file system" }, 211 { ETXTBSY, ALL, "text busy" }, 212 #ifdef SYSV 213 { EAGAIN, E_EXEC, "not enough memory" }, 214 #endif 215 { ENOMEM, ALL, "not enough memory" }, 216 #ifdef ENOLINK 217 { ENOLINK, ALL, "remote access failed" }, 218 #endif 219 #ifdef EMULTIHOP 220 { EMULTIHOP, ALL, "remote access failed" }, 221 #endif 222 #ifdef ECOMM 223 { ECOMM, ALL, "remote access failed" }, 224 #endif 225 #ifdef ESTALE 226 { ESTALE, ALL, "remote access failed" }, 227 #endif 228 #ifdef ETIMEDOUT 229 { ETIMEDOUT, ALL, "remote access failed" }, 230 #endif 231 #ifdef ELOOP 232 { ELOOP, ALL, "symbolic link loop" }, 233 #endif 234 { E2BIG, E_EXEC, "argument list too long" }, 235 #ifdef ELIBACC 236 { ELIBACC, E_EXEC, "shared library missing" }, 237 #endif 238 { 0, 0, NULL }, 239 }; 240 241 242 /* 243 * Return a string describing an error. The returned string may be a 244 * pointer to a static buffer that will be overwritten on the next call. 245 * Action describes the operation that got the error. 246 */ 247 248 char * 249 errmsg(e, action) 250 int e; 251 int action; 252 { 253 struct errname const *ep; 254 static char buf[12]; 255 256 for (ep = errormsg ; ep->errcode ; ep++) { 257 if (ep->errcode == e && (ep->action & action) != 0) 258 return ep->msg; 259 } 260 fmtstr(buf, sizeof buf, "error %d", e); 261 return buf; 262 } 263