372 lines
8.1 KiB
C
372 lines
8.1 KiB
C
/* $NetBSD: error.c,v 1.33 2006/10/04 15:00:38 christos Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
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#else
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__RCSID("$NetBSD: error.c,v 1.33 2006/10/04 15:00:38 christos Exp $");
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#endif
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#endif /* not lint */
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/*
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* Errors and exceptions.
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*/
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "shell.h"
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#include "main.h"
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#include "options.h"
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#include "output.h"
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#include "error.h"
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#include "show.h"
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/*
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* Code to handle exceptions in C.
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*/
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struct jmploc *handler;
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int exception;
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volatile int suppressint;
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volatile int intpending;
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char *commandname;
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static void exverror(int, const char *, va_list)
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__attribute__((__noreturn__));
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/*
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* Called to raise an exception. Since C doesn't include exceptions, we
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* just do a longjmp to the exception handler. The type of exception is
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* stored in the global variable "exception".
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*/
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void
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exraise(int e)
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{
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if (handler == NULL)
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abort();
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exception = e;
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longjmp(handler->loc, 1);
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}
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/*
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* Called from trap.c when a SIGINT is received. (If the user specifies
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* that SIGINT is to be trapped or ignored using the trap builtin, then
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* this routine is not called.) Suppressint is nonzero when interrupts
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* are held using the INTOFF macro. The call to _exit is necessary because
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* there is a short period after a fork before the signal handlers are
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* set to the appropriate value for the child. (The test for iflag is
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* just defensive programming.)
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*/
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void
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onint(void)
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{
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sigset_t nsigset;
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if (suppressint) {
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intpending = 1;
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return;
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}
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intpending = 0;
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sigemptyset(&nsigset);
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sigprocmask(SIG_SETMASK, &nsigset, NULL);
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if (rootshell && iflag)
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exraise(EXINT);
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else {
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signal(SIGINT, SIG_DFL);
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raise(SIGINT);
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}
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/* NOTREACHED */
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}
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static void
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exvwarning(int sv_errno, const char *msg, va_list ap)
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{
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/* Partially emulate line buffered output so that:
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* printf '%d\n' 1 a 2
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* and
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* printf '%d %d %d\n' 1 a 2
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* both generate sensible text when stdout and stderr are merged.
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*/
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if (output.nextc != output.buf && output.nextc[-1] == '\n')
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flushout(&output);
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if (commandname)
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outfmt(&errout, "%s: ", commandname);
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else
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outfmt(&errout, "%s: ", getprogname());
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if (msg != NULL) {
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doformat(&errout, msg, ap);
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if (sv_errno >= 0)
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outfmt(&errout, ": ");
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}
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if (sv_errno >= 0)
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outfmt(&errout, "%s", strerror(sv_errno));
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out2c('\n');
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flushout(&errout);
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}
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/*
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* Exverror is called to raise the error exception. If the second argument
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* is not NULL then error prints an error message using printf style
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* formatting. It then raises the error exception.
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*/
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static void
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exverror(int cond, const char *msg, va_list ap)
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{
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CLEAR_PENDING_INT;
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INTOFF;
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#ifdef DEBUG
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if (msg) {
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TRACE(("exverror(%d, \"", cond));
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TRACEV((msg, ap));
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TRACE(("\") pid=%d\n", getpid()));
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} else
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TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
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#endif
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if (msg)
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exvwarning(-1, msg, ap);
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flushall();
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exraise(cond);
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/* NOTREACHED */
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}
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void
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error(const char *msg, ...)
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{
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va_list ap;
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va_start(ap, msg);
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exverror(EXERROR, msg, ap);
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/* NOTREACHED */
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va_end(ap);
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}
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void
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exerror(int cond, const char *msg, ...)
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{
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va_list ap;
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va_start(ap, msg);
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exverror(cond, msg, ap);
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/* NOTREACHED */
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va_end(ap);
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}
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/*
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* error/warning routines for external builtins
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*/
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void
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sh_exit(int rval)
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{
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exerrno = rval & 255;
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exraise(EXEXEC);
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}
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void
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sh_err(int status, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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exvwarning(errno, fmt, ap);
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va_end(ap);
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sh_exit(status);
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}
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void
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sh_verr(int status, const char *fmt, va_list ap)
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{
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exvwarning(errno, fmt, ap);
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sh_exit(status);
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}
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void
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sh_errx(int status, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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exvwarning(-1, fmt, ap);
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va_end(ap);
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sh_exit(status);
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}
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void
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sh_verrx(int status, const char *fmt, va_list ap)
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{
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exvwarning(-1, fmt, ap);
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sh_exit(status);
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}
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void
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sh_warn(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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exvwarning(errno, fmt, ap);
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va_end(ap);
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}
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void
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sh_vwarn(const char *fmt, va_list ap)
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{
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exvwarning(errno, fmt, ap);
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}
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void
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sh_warnx(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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exvwarning(-1, fmt, ap);
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va_end(ap);
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}
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void
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sh_vwarnx(const char *fmt, va_list ap)
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{
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exvwarning(-1, fmt, ap);
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}
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/*
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* Table of error messages.
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*/
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struct errname {
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short errcode; /* error number */
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short action; /* operation which encountered the error */
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const char *msg; /* text describing the error */
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};
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#define ALL (E_OPEN|E_CREAT|E_EXEC)
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STATIC const struct errname errormsg[] = {
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{ EINTR, ALL, "interrupted" },
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{ EACCES, ALL, "permission denied" },
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{ EIO, ALL, "I/O error" },
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{ EEXIST, ALL, "file exists" },
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{ ENOENT, E_OPEN, "no such file" },
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{ ENOENT, E_CREAT,"directory nonexistent" },
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{ ENOENT, E_EXEC, "not found" },
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{ ENOTDIR, E_OPEN, "no such file" },
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{ ENOTDIR, E_CREAT,"directory nonexistent" },
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{ ENOTDIR, E_EXEC, "not found" },
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{ EISDIR, ALL, "is a directory" },
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#ifdef EMFILE
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{ EMFILE, ALL, "too many open files" },
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#endif
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{ ENFILE, ALL, "file table overflow" },
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{ ENOSPC, ALL, "file system full" },
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#ifdef EDQUOT
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{ EDQUOT, ALL, "disk quota exceeded" },
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#endif
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#ifdef ENOSR
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{ ENOSR, ALL, "no streams resources" },
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#endif
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{ ENXIO, ALL, "no such device or address" },
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{ EROFS, ALL, "read-only file system" },
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{ ETXTBSY, ALL, "text busy" },
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#ifdef EAGAIN
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{ EAGAIN, E_EXEC, "not enough memory" },
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#endif
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{ ENOMEM, ALL, "not enough memory" },
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#ifdef ENOLINK
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{ ENOLINK, ALL, "remote access failed" },
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#endif
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#ifdef EMULTIHOP
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{ EMULTIHOP, ALL, "remote access failed" },
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#endif
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#ifdef ECOMM
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{ ECOMM, ALL, "remote access failed" },
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#endif
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#ifdef ESTALE
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{ ESTALE, ALL, "remote access failed" },
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#endif
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#ifdef ETIMEDOUT
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{ ETIMEDOUT, ALL, "remote access failed" },
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#endif
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#ifdef ELOOP
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{ ELOOP, ALL, "symbolic link loop" },
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#endif
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#ifdef ENAMETOOLONG
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{ ENAMETOOLONG, ALL, "file name too long" },
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#endif
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{ E2BIG, E_EXEC, "argument list too long" },
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#ifdef ELIBACC
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{ ELIBACC, E_EXEC, "shared library missing" },
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#endif
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{ 0, 0, NULL },
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};
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/*
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* Return a string describing an error. The returned string may be a
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* pointer to a static buffer that will be overwritten on the next call.
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* Action describes the operation that got the error.
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*/
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const char *
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errmsg(int e, int action)
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{
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struct errname const *ep;
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static char buf[12];
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for (ep = errormsg ; ep->errcode ; ep++) {
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if (ep->errcode == e && (ep->action & action) != 0)
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return ep->msg;
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}
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fmtstr(buf, sizeof buf, "error %d", e);
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return buf;
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}
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