190 lines
4.9 KiB
C
190 lines
4.9 KiB
C
/*-
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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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* 4. 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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#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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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Errors and exceptions.
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*/
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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 "nodes.h" /* show.h needs nodes.h */
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#include "show.h"
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#include "trap.h"
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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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/*
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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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volatile sig_atomic_t exception;
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volatile sig_atomic_t suppressint;
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volatile sig_atomic_t intpending;
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char *commandname;
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static void exverror(int, const char *, va_list) __printf0like(2, 0) __dead2;
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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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* Interrupts are disabled; they should be reenabled when the exception is
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* caught.
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*/
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void
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exraise(int e)
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{
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INTOFF;
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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. If SIGINTs are not suppressed and
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* the shell is not a root shell, then we want to be terminated if we
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* get here, as if we were terminated directly by a SIGINT. Arrange for
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* this here.
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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 sigs;
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/*
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* The !in_dotrap here is safe. The only way we can arrive here
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* with in_dotrap set is that a trap handler set SIGINT to SIG_DFL
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* and killed itself.
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*/
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if (suppressint && !in_dotrap) {
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intpending++;
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return;
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}
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intpending = 0;
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sigemptyset(&sigs);
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sigprocmask(SIG_SETMASK, &sigs, NULL);
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/*
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* This doesn't seem to be needed, since main() emits a newline.
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*/
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#if 0
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if (tcgetpgrp(0) == getpid())
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write(STDERR_FILENO, "\n", 1);
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#endif
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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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kill(getpid(), SIGINT);
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}
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}
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/*
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* Exverror is called to raise the error exception. If the first 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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/*
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* An interrupt trumps an error. Certain places catch error
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* exceptions or transform them to a plain nonzero exit code
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* in child processes, and if an error exception can be handled,
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* an interrupt can be handled as well.
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*
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* exraise() will disable interrupts for the exception handler.
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*/
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FORCEINTON;
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#ifdef DEBUG
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if (msg)
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TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, 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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if (commandname)
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outfmt(out2, "%s: ", commandname);
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doformat(out2, msg, ap);
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out2c('\n');
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}
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flushall();
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exraise(cond);
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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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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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va_end(ap);
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}
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