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mirror of https://git.FreeBSD.org/src.git synced 2024-12-23 11:18:54 +00:00
freebsd/bin/sh/error.c
Warner Losh fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

200 lines
5.0 KiB
C

/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Errors and exceptions.
*/
#include "shell.h"
#include "eval.h"
#include "main.h"
#include "options.h"
#include "output.h"
#include "error.h"
#include "nodes.h" /* show.h needs nodes.h */
#include "show.h"
#include "trap.h"
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
/*
* Code to handle exceptions in C.
*/
struct jmploc *handler;
volatile sig_atomic_t exception;
volatile sig_atomic_t suppressint;
volatile sig_atomic_t intpending;
static void exverror(int, const char *, va_list) __printf0like(2, 0) __dead2;
/*
* Called to raise an exception. Since C doesn't include exceptions, we
* just do a longjmp to the exception handler. The type of exception is
* stored in the global variable "exception".
*
* Interrupts are disabled; they should be reenabled when the exception is
* caught.
*/
void
exraise(int e)
{
INTOFF;
if (handler == NULL)
abort();
exception = e;
longjmp(handler->loc, 1);
}
/*
* Called from trap.c when a SIGINT is received and not suppressed, or when
* an interrupt is pending and interrupts are re-enabled using INTON.
* (If the user specifies that SIGINT is to be trapped or ignored using the
* trap builtin, then this routine is not called.) Suppressint is nonzero
* when interrupts are held using the INTOFF macro. If SIGINTs are not
* suppressed and the shell is not a root shell, then we want to be
* terminated if we get here, as if we were terminated directly by a SIGINT.
* Arrange for this here.
*/
void
onint(void)
{
sigset_t sigs;
intpending = 0;
sigemptyset(&sigs);
sigprocmask(SIG_SETMASK, &sigs, NULL);
/*
* This doesn't seem to be needed, since main() emits a newline.
*/
#if 0
if (tcgetpgrp(0) == getpid())
write(STDERR_FILENO, "\n", 1);
#endif
if (rootshell && iflag)
exraise(EXINT);
else {
signal(SIGINT, SIG_DFL);
kill(getpid(), SIGINT);
_exit(128 + SIGINT);
}
}
static void
vwarning(const char *msg, va_list ap)
{
if (commandname)
outfmt(out2, "%s: ", commandname);
else if (arg0)
outfmt(out2, "%s: ", arg0);
doformat(out2, msg, ap);
out2fmt_flush("\n");
}
void
warning(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
vwarning(msg, ap);
va_end(ap);
}
/*
* Exverror is called to raise the error exception. If the first argument
* is not NULL then error prints an error message using printf style
* formatting. It then raises the error exception.
*/
static void
exverror(int cond, const char *msg, va_list ap)
{
/*
* An interrupt trumps an error. Certain places catch error
* exceptions or transform them to a plain nonzero exit code
* in child processes, and if an error exception can be handled,
* an interrupt can be handled as well.
*
* exraise() will disable interrupts for the exception handler.
*/
FORCEINTON;
#ifdef DEBUG
if (msg)
TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
else
TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
#endif
if (msg)
vwarning(msg, ap);
flushall();
exraise(cond);
}
void
error(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
exverror(EXERROR, msg, ap);
va_end(ap);
}
void
exerror(int cond, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
exverror(cond, msg, ap);
va_end(ap);
}