| 1 | /* $NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1991, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to Berkeley by
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| 8 | * Kenneth Almquist.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | * 3. All advertising materials mentioning features or use of this software
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| 19 | * must display the following acknowledgement:
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| 20 | * This product includes software developed by the University of
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| 21 | * California, Berkeley and its contributors.
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| 22 | * 4. Neither the name of the University nor the names of its contributors
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| 23 | * may be used to endorse or promote products derived from this software
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| 24 | * without specific prior written permission.
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| 25 | *
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| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 36 | * SUCH DAMAGE.
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| 37 | */
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| 38 |
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| 39 | #include <sys/cdefs.h>
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| 40 | #ifndef lint
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| 41 | #if 0
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| 42 | static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
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| 43 | #else
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| 44 | __RCSID("$NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt Exp $");
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| 45 | #endif
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| 46 | #endif /* not lint */
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| 47 |
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| 48 | /*
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| 49 | * Errors and exceptions.
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| 50 | */
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| 51 |
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| 52 | #include <signal.h>
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| 53 | #include <stdlib.h>
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| 54 | #include <unistd.h>
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| 55 | #include <errno.h>
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| 56 |
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| 57 | #include "shell.h"
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| 58 | #include "main.h"
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| 59 | #include "options.h"
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| 60 | #include "output.h"
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| 61 | #include "error.h"
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| 62 | #include "show.h"
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| 63 |
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| 64 |
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| 65 | /*
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| 66 | * Code to handle exceptions in C.
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| 67 | */
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| 68 |
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| 69 | struct jmploc *handler;
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| 70 | int exception;
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| 71 | volatile int suppressint;
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| 72 | volatile int intpending;
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| 73 | char *commandname;
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| 74 |
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| 75 |
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| 76 | static void exverror (int, const char *, va_list)
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| 77 | __attribute__((__noreturn__));
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| 78 |
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| 79 | /*
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| 80 | * Called to raise an exception. Since C doesn't include exceptions, we
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| 81 | * just do a longjmp to the exception handler. The type of exception is
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| 82 | * stored in the global variable "exception".
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| 83 | */
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| 84 |
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| 85 | void
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| 86 | exraise(e)
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| 87 | int e;
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| 88 | {
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| 89 | if (handler == NULL)
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| 90 | abort();
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| 91 | exception = e;
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| 92 | longjmp(handler->loc, 1);
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| 93 | }
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| 94 |
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| 95 |
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| 96 | /*
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| 97 | * Called from trap.c when a SIGINT is received. (If the user specifies
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| 98 | * that SIGINT is to be trapped or ignored using the trap builtin, then
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| 99 | * this routine is not called.) Suppressint is nonzero when interrupts
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| 100 | * are held using the INTOFF macro. The call to _exit is necessary because
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| 101 | * there is a short period after a fork before the signal handlers are
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| 102 | * set to the appropriate value for the child. (The test for iflag is
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| 103 | * just defensive programming.)
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| 104 | */
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| 105 |
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| 106 | void
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| 107 | onint() {
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| 108 | sigset_t sigset;
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| 109 |
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| 110 | if (suppressint) {
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| 111 | intpending++;
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| 112 | return;
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| 113 | }
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| 114 | intpending = 0;
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| 115 | sigemptyset(&sigset);
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| 116 | sigprocmask(SIG_SETMASK, &sigset, NULL);
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| 117 | if (rootshell && iflag)
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| 118 | exraise(EXINT);
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| 119 | else {
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| 120 | signal(SIGINT, SIG_DFL);
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| 121 | raise(SIGINT);
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| 122 | }
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| 123 | /* NOTREACHED */
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| 124 | }
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| 125 |
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| 126 |
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| 127 | /*
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| 128 | * Exverror is called to raise the error exception. If the first argument
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| 129 | * is not NULL then error prints an error message using printf style
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| 130 | * formatting. It then raises the error exception.
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| 131 | */
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| 132 | static void
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| 133 | exverror(cond, msg, ap)
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| 134 | int cond;
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| 135 | const char *msg;
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| 136 | va_list ap;
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| 137 | {
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| 138 | CLEAR_PENDING_INT;
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| 139 | INTOFF;
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| 140 |
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| 141 | #ifdef DEBUG
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| 142 | if (msg)
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| 143 | TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
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| 144 | else
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| 145 | TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
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| 146 | #endif
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| 147 | if (msg) {
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| 148 | if (commandname)
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| 149 | outfmt(&errout, "%s: ", commandname);
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| 150 | doformat(&errout, msg, ap);
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| 151 | out2c('\n');
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| 152 | }
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| 153 | flushall();
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| 154 | exraise(cond);
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| 155 | /* NOTREACHED */
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| 156 | }
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| 157 |
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| 158 |
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| 159 | #ifdef __STDC__
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| 160 | void
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| 161 | error(const char *msg, ...)
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| 162 | #else
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| 163 | void
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| 164 | error(va_alist)
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| 165 | va_dcl
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| 166 | #endif
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| 167 | {
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| 168 | #ifndef __STDC__
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| 169 | const char *msg;
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| 170 | #endif
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| 171 | va_list ap;
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| 172 | #ifdef __STDC__
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| 173 | va_start(ap, msg);
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| 174 | #else
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| 175 | va_start(ap);
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| 176 | msg = va_arg(ap, const char *);
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| 177 | #endif
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| 178 | exverror(EXERROR, msg, ap);
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| 179 | /* NOTREACHED */
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| 180 | va_end(ap);
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| 181 | }
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| 182 |
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| 183 |
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| 184 | #ifdef __STDC__
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| 185 | void
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| 186 | exerror(int cond, const char *msg, ...)
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| 187 | #else
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| 188 | void
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| 189 | exerror(va_alist)
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| 190 | va_dcl
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| 191 | #endif
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| 192 | {
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| 193 | #ifndef __STDC__
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| 194 | int cond;
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| 195 | const char *msg;
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| 196 | #endif
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| 197 | va_list ap;
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| 198 | #ifdef __STDC__
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| 199 | va_start(ap, msg);
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| 200 | #else
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| 201 | va_start(ap);
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| 202 | cond = va_arg(ap, int);
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| 203 | msg = va_arg(ap, const char *);
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| 204 | #endif
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| 205 | exverror(cond, msg, ap);
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| 206 | /* NOTREACHED */
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| 207 | va_end(ap);
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| 208 | }
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| 209 |
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| 210 |
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| 211 |
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| 212 | /*
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| 213 | * Table of error messages.
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| 214 | */
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| 215 |
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| 216 | struct errname {
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| 217 | short errcode; /* error number */
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| 218 | short action; /* operation which encountered the error */
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| 219 | const char *msg; /* text describing the error */
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| 220 | };
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| 221 |
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| 222 |
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| 223 | #define ALL (E_OPEN|E_CREAT|E_EXEC)
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| 224 |
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| 225 | STATIC const struct errname errormsg[] = {
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| 226 | { EINTR, ALL, "interrupted" },
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| 227 | { EACCES, ALL, "permission denied" },
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| 228 | { EIO, ALL, "I/O error" },
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| 229 | { ENOENT, E_OPEN, "no such file" },
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| 230 | { ENOENT, E_CREAT,"directory nonexistent" },
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| 231 | { ENOENT, E_EXEC, "not found" },
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| 232 | { ENOTDIR, E_OPEN, "no such file" },
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| 233 | { ENOTDIR, E_CREAT,"directory nonexistent" },
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| 234 | { ENOTDIR, E_EXEC, "not found" },
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| 235 | { EISDIR, ALL, "is a directory" },
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| 236 | { EEXIST, E_CREAT,"file exists" },
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| 237 | #ifdef notdef
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| 238 | { EMFILE, ALL, "too many open files" },
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| 239 | #endif
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| 240 | { ENFILE, ALL, "file table overflow" },
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| 241 | { ENOSPC, ALL, "file system full" },
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| 242 | #ifdef EDQUOT
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| 243 | { EDQUOT, ALL, "disk quota exceeded" },
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| 244 | #endif
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| 245 | #ifdef ENOSR
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| 246 | { ENOSR, ALL, "no streams resources" },
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| 247 | #endif
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| 248 | { ENXIO, ALL, "no such device or address" },
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| 249 | { EROFS, ALL, "read-only file system" },
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| 250 | { ETXTBSY, ALL, "text busy" },
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| 251 | #ifdef SYSV
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| 252 | { EAGAIN, E_EXEC, "not enough memory" },
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| 253 | #endif
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| 254 | { ENOMEM, ALL, "not enough memory" },
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| 255 | #ifdef ENOLINK
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| 256 | { ENOLINK, ALL, "remote access failed" },
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| 257 | #endif
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| 258 | #ifdef EMULTIHOP
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| 259 | { EMULTIHOP, ALL, "remote access failed" },
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| 260 | #endif
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| 261 | #ifdef ECOMM
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| 262 | { ECOMM, ALL, "remote access failed" },
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| 263 | #endif
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| 264 | #ifdef ESTALE
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| 265 | { ESTALE, ALL, "remote access failed" },
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| 266 | #endif
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| 267 | #ifdef ETIMEDOUT
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| 268 | { ETIMEDOUT, ALL, "remote access failed" },
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| 269 | #endif
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| 270 | #ifdef ELOOP
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| 271 | { ELOOP, ALL, "symbolic link loop" },
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| 272 | #endif
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| 273 | { E2BIG, E_EXEC, "argument list too long" },
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| 274 | #ifdef ELIBACC
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| 275 | { ELIBACC, E_EXEC, "shared library missing" },
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| 276 | #endif
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| 277 | { 0, 0, NULL },
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| 278 | };
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| 279 |
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| 280 |
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| 281 | /*
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| 282 | * Return a string describing an error. The returned string may be a
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| 283 | * pointer to a static buffer that will be overwritten on the next call.
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| 284 | * Action describes the operation that got the error.
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| 285 | */
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| 286 |
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| 287 | const char *
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| 288 | errmsg(e, action)
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| 289 | int e;
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| 290 | int action;
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| 291 | {
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| 292 | struct errname const *ep;
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| 293 | static char buf[12];
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| 294 |
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| 295 | for (ep = errormsg ; ep->errcode ; ep++) {
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| 296 | if (ep->errcode == e && (ep->action & action) != 0)
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| 297 | return ep->msg;
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| 298 | }
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| 299 | fmtstr(buf, sizeof buf, "error %d", e);
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| 300 | return buf;
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| 301 | }
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