error.c revision 1.7
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 37 #ifndef lint 38 static char sccsid[] = "@(#)error.c 8.1 (Berkeley) 5/31/93"; 39 #endif /* not lint */ 40 41 /* 42 * Errors and exceptions. 43 */ 44 45 #include "shell.h" 46 #include "main.h" 47 #include "options.h" 48 #include "output.h" 49 #include "error.h" 50 #include <signal.h> 51 #ifdef __STDC__ 52 #include "stdarg.h" 53 #else 54 #include <varargs.h> 55 #endif 56 #include <unistd.h> 57 #include <errno.h> 58 59 60 /* 61 * Code to handle exceptions in C. 62 */ 63 64 struct jmploc *handler; 65 int exception; 66 volatile int suppressint; 67 volatile int intpending; 68 char *commandname; 69 70 71 /* 72 * Called to raise an exception. Since C doesn't include exceptions, we 73 * just do a longjmp to the exception handler. The type of exception is 74 * stored in the global variable "exception". 75 */ 76 77 void 78 exraise(e) { 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 if (suppressint) { 99 intpending++; 100 return; 101 } 102 intpending = 0; 103 #ifdef BSD 104 sigsetmask(0); 105 #endif 106 if (rootshell && iflag) 107 exraise(EXINT); 108 else 109 _exit(128 + SIGINT); 110 } 111 112 113 114 void 115 error2(a, b) 116 char *a, *b; 117 { 118 error("%s: %s", a, b); 119 } 120 121 122 /* 123 * Error is called to raise the error exception. If the first argument 124 * is not NULL then error prints an error message using printf style 125 * formatting. It then raises the error exception. 126 */ 127 128 #ifdef __STDC__ 129 void 130 error(char *msg, ...) { 131 #else 132 void 133 error(va_alist) 134 va_dcl 135 { 136 char *msg; 137 #endif 138 va_list ap; 139 140 CLEAR_PENDING_INT; 141 INTOFF; 142 #ifdef __STDC__ 143 va_start(ap, msg); 144 #else 145 va_start(ap); 146 msg = va_arg(ap, char *); 147 #endif 148 #ifdef DEBUG 149 if (msg) 150 TRACE(("error(\"%s\") pid=%d\n", msg, getpid())); 151 else 152 TRACE(("error(NULL) pid=%d\n", getpid())); 153 #endif 154 if (msg) { 155 if (commandname) 156 outfmt(&errout, "%s: ", commandname); 157 doformat(&errout, msg, ap); 158 out2c('\n'); 159 } 160 va_end(ap); 161 flushall(); 162 exraise(EXERROR); 163 } 164 165 166 167 /* 168 * Table of error messages. 169 */ 170 171 struct errname { 172 short errcode; /* error number */ 173 short action; /* operation which encountered the error */ 174 char *msg; /* text describing the error */ 175 }; 176 177 178 #define ALL (E_OPEN|E_CREAT|E_EXEC) 179 180 STATIC const struct errname errormsg[] = { 181 EINTR, ALL, "interrupted", 182 EACCES, ALL, "permission denied", 183 EIO, ALL, "I/O error", 184 ENOENT, E_OPEN, "no such file", 185 ENOENT, E_CREAT, "directory nonexistent", 186 ENOENT, E_EXEC, "not found", 187 ENOTDIR, E_OPEN, "no such file", 188 ENOTDIR, E_CREAT, "directory nonexistent", 189 ENOTDIR, E_EXEC, "not found", 190 EISDIR, ALL, "is a directory", 191 /* EMFILE, ALL, "too many open files", */ 192 ENFILE, ALL, "file table overflow", 193 ENOSPC, ALL, "file system full", 194 #ifdef EDQUOT 195 EDQUOT, ALL, "disk quota exceeded", 196 #endif 197 #ifdef ENOSR 198 ENOSR, ALL, "no streams resources", 199 #endif 200 ENXIO, ALL, "no such device or address", 201 EROFS, ALL, "read-only file system", 202 ETXTBSY, ALL, "text busy", 203 #ifdef SYSV 204 EAGAIN, E_EXEC, "not enough memory", 205 #endif 206 ENOMEM, ALL, "not enough memory", 207 #ifdef ENOLINK 208 ENOLINK, ALL, "remote access failed", 209 #endif 210 #ifdef EMULTIHOP 211 EMULTIHOP, ALL, "remote access failed", 212 #endif 213 #ifdef ECOMM 214 ECOMM, ALL, "remote access failed", 215 #endif 216 #ifdef ESTALE 217 ESTALE, ALL, "remote access failed", 218 #endif 219 #ifdef ETIMEDOUT 220 ETIMEDOUT, ALL, "remote access failed", 221 #endif 222 #ifdef ELOOP 223 ELOOP, ALL, "symbolic link loop", 224 #endif 225 E2BIG, E_EXEC, "argument list too long", 226 #ifdef ELIBACC 227 ELIBACC, E_EXEC, "shared library missing", 228 #endif 229 0, 0, NULL 230 }; 231 232 233 /* 234 * Return a string describing an error. The returned string may be a 235 * pointer to a static buffer that will be overwritten on the next call. 236 * Action describes the operation that got the error. 237 */ 238 239 char * 240 errmsg(e, action) { 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
Indexes created Tue Sep 23 21:09:50 GMT 2025