| 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | */
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| 36 |
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| 37 | #ifndef lint
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| 38 | static char sccsid[] = "@(#)error.c 5.1 (Berkeley) 3/7/91";
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| 39 | #endif /* not lint */
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| 40 |
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| 41 | /*
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| 42 | * Errors and exceptions.
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| 43 | */
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| 44 |
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| 45 | #include "shell.h"
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| 46 | #include "main.h"
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| 47 | #include "options.h"
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| 48 | #include "output.h"
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| 49 | #include "error.h"
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| 50 | #include <sys/types.h>
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| 51 | #include <signal.h>
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| 52 | #ifdef __STDC__
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| 53 | #include "stdarg.h"
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| 54 | #else
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| 55 | #include <varargs.h>
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| 56 | #endif
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| 57 | #include <errno.h>
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| 58 |
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| 59 |
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| 60 | /*
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| 61 | * Code to handle exceptions in C.
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| 62 | */
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| 63 |
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| 64 | struct jmploc *handler;
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| 65 | int exception;
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| 66 | volatile int suppressint;
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| 67 | volatile int intpending;
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| 68 | char *commandname;
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| 69 |
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| 70 |
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| 71 | /*
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| 72 | * Called to raise an exception. Since C doesn't include exceptions, we
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| 73 | * just do a longjmp to the exception handler. The type of exception is
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| 74 | * stored in the global variable "exception".
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| 75 | */
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| 76 |
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| 77 | void
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| 78 | exraise(e) {
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| 79 | if (handler == NULL)
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| 80 | abort();
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| 81 | exception = e;
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| 82 | longjmp(handler->loc, 1);
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| 83 | }
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| 84 |
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| 85 |
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| 86 | /*
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| 87 | * Called from trap.c when a SIGINT is received. (If the user specifies
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| 88 | * that SIGINT is to be trapped or ignored using the trap builtin, then
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| 89 | * this routine is not called.) Suppressint is nonzero when interrupts
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| 90 | * are held using the INTOFF macro. The call to _exit is necessary because
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| 91 | * there is a short period after a fork before the signal handlers are
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| 92 | * set to the appropriate value for the child. (The test for iflag is
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| 93 | * just defensive programming.)
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| 94 | */
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| 95 |
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| 96 | void
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| 97 | onint() {
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| 98 | if (suppressint) {
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| 99 | intpending++;
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| 100 | return;
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| 101 | }
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| 102 | intpending = 0;
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| 103 | #ifdef BSD
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| 104 | sigsetmask(0);
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| 105 | #endif
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| 106 | if (rootshell && iflag)
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| 107 | exraise(EXINT);
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| 108 | else
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| 109 | _exit(128 + SIGINT);
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| 110 | }
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| 111 |
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| 112 |
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| 113 |
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| 114 | void
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| 115 | error2(a, b)
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| 116 | char *a, *b;
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| 117 | {
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| 118 | error("%s: %s", a, b);
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| 119 | }
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| 120 |
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| 121 |
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| 122 | /*
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| 123 | * Error is called to raise the error exception. If the first argument
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| 124 | * is not NULL then error prints an error message using printf style
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| 125 | * formatting. It then raises the error exception.
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| 126 | */
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| 127 |
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| 128 | #ifdef __STDC__
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| 129 | void
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| 130 | error(char *msg, ...) {
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| 131 | #else
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| 132 | void
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| 133 | error(va_alist)
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| 134 | va_dcl
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| 135 | {
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| 136 | char *msg;
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| 137 | #endif
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| 138 | va_list ap;
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| 139 |
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| 140 | CLEAR_PENDING_INT;
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| 141 | INTOFF;
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| 142 | #ifdef __STDC__
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| 143 | va_start(ap, msg);
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| 144 | #else
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| 145 | va_start(ap);
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| 146 | msg = va_arg(ap, char *);
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| 147 | #endif
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| 148 | #if DEBUG
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| 149 | if (msg)
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| 150 | TRACE(("error(\"%s\") pid=%d\n", msg, getpid()));
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| 151 | else
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| 152 | TRACE(("error(NULL) pid=%d\n", getpid()));
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| 153 | #endif
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| 154 | if (msg) {
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| 155 | if (commandname)
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| 156 | outfmt(&errout, "%s: ", commandname);
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| 157 | doformat(&errout, msg, ap);
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| 158 | out2c('\n');
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| 159 | }
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| 160 | va_end(ap);
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| 161 | flushall();
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| 162 | exraise(EXERROR);
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| 163 | }
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| 164 |
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| 165 |
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| 166 | #ifdef notdef /* These strange error messages only confuse. -- kjb */
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| 167 | /*
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| 168 | * Table of error messages.
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| 169 | */
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| 170 |
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| 171 | struct errname {
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| 172 | short errcode; /* error number */
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| 173 | short action; /* operation which encountered the error */
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| 174 | char *msg; /* text describing the error */
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| 175 | };
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| 176 |
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| 177 |
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| 178 | #define ALL (E_OPEN|E_CREAT|E_EXEC)
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| 179 |
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| 180 | STATIC const struct errname errormsg[] = {
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| 181 | EINTR, ALL, "interrupted",
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| 182 | EACCES, ALL, "permission denied",
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| 183 | EIO, ALL, "I/O error",
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| 184 | ENOENT, E_OPEN, "no such file",
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| 185 | ENOENT, E_CREAT, "directory nonexistent",
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| 186 | ENOENT, E_EXEC, "not found",
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| 187 | ENOTDIR, E_OPEN, "no such file",
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| 188 | ENOTDIR, E_CREAT, "directory nonexistent",
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| 189 | ENOTDIR, E_EXEC, "not found",
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| 190 | ENOEXEC, ALL, "not an executable",
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| 191 | EISDIR, ALL, "is a directory",
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| 192 | /* EMFILE, ALL, "too many open files", */
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| 193 | ENFILE, ALL, "file table overflow",
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| 194 | ENOSPC, ALL, "file system full",
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| 195 | #ifdef EDQUOT
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| 196 | EDQUOT, ALL, "disk quota exceeded",
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| 197 | #endif
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| 198 | #ifdef ENOSR
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| 199 | ENOSR, ALL, "no streams resources",
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| 200 | #endif
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| 201 | ENXIO, ALL, "no such device or address",
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| 202 | EROFS, ALL, "read-only file system",
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| 203 | ETXTBSY, ALL, "text busy",
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| 204 | #ifdef SYSV
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| 205 | EAGAIN, E_EXEC, "not enough memory",
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| 206 | #endif
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| 207 | ENOMEM, ALL, "not enough memory",
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| 208 | #ifdef ENOLINK
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| 209 | ENOLINK, ALL, "remote access failed",
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| 210 | #endif
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| 211 | #ifdef EMULTIHOP
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| 212 | EMULTIHOP, ALL, "remote access failed",
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| 213 | #endif
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| 214 | #ifdef ECOMM
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| 215 | ECOMM, ALL, "remote access failed",
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| 216 | #endif
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| 217 | #ifdef ESTALE
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| 218 | ESTALE, ALL, "remote access failed",
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| 219 | #endif
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| 220 | #ifdef ETIMEDOUT
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| 221 | ETIMEDOUT, ALL, "remote access failed",
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| 222 | #endif
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| 223 | #ifdef ELOOP
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| 224 | ELOOP, ALL, "symbolic link loop",
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| 225 | #endif
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| 226 | E2BIG, E_EXEC, "argument list too long",
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| 227 | #ifdef ELIBACC
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| 228 | ELIBACC, E_EXEC, "shared library missing",
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| 229 | #endif
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| 230 | 0, 0, NULL
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| 231 | };
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| 232 |
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| 233 |
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| 234 | /*
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| 235 | * Return a string describing an error. The returned string may be a
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| 236 | * pointer to a static buffer that will be overwritten on the next call.
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| 237 | * Action describes the operation that got the error.
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| 238 | */
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| 239 |
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| 240 | char *
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| 241 | errmsg(e, action) {
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| 242 | const struct errname *ep;
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| 243 | static char buf[12];
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| 244 |
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| 245 | for (ep = errormsg ; ep->errcode ; ep++) {
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| 246 | if (ep->errcode == e && (ep->action & action) != 0)
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| 247 | return ep->msg;
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| 248 | }
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| 249 | fmtstr(buf, sizeof buf, "error %d", e);
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| 250 | return buf;
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| 251 | }
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| 252 | #endif
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