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/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1997-2005
* Herbert Xu <herbert@gondor.apana.org.au>. 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.
*/
/*
* Errors and exceptions.
*/
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include "shell.h"
#include "main.h"
#include "options.h"
#include "output.h"
#include "error.h"
#include "show.h"
#include "eval.h"
#include "parser.h"
#include "trap.h"
#include "system.h"
/*
* Code to handle exceptions in C.
*/
struct jmploc *handler;
int exception;
int suppressint;
volatile sig_atomic_t intpending;
static void exverror(int, const char *, va_list)
__attribute__((__noreturn__));
/*
* 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".
*/
void
exraise(int e)
{
#ifdef DEBUG
if (handler == NULL)
abort();
#endif
INTOFF;
exception = e;
longjmp(handler->loc, 1);
}
/*
* Called from trap.c when a SIGINT is received. (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. (The test for iflag is just
* defensive programming.)
*/
void
onint(void) {
int i;
intpending = 0;
sigclearmask();
i = EXSIG;
if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
if (!(rootshell && iflag)) {
signal(SIGINT, SIG_DFL);
raise(SIGINT);
}
i = EXINT;
}
exraise(i);
/* NOTREACHED */
}
static void
exvwarning2(const char *msg, va_list ap)
{
struct output *errs;
const char *name;
const char *fmt;
errs = out2;
name = arg0 ?: "sh";
fmt = "%s: ";
if (commandname) {
name = commandname;
fmt = "%s: %d: ";
}
outfmt(errs, fmt, name, startlinno);
doformat(errs, msg, ap);
#if FLUSHERR
outc('\n', errs);
#else
outcslow('\n', errs);
#endif
}
#define exvwarning(a, b, c) exvwarning2(b, c)
/*
* Exverror is called to raise the error exception. If the second 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)
{
#ifdef DEBUG
if (msg) {
TRACE(("exverror(%d, \"", cond));
TRACEV((msg, ap));
TRACE(("\") pid=%d\n", getpid()));
} else
TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
if (msg)
#endif
exvwarning(-1, msg, ap);
flushall();
exraise(cond);
/* NOTREACHED */
}
void
sh_error(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
exverror(EXERROR, msg, ap);
/* NOTREACHED */
va_end(ap);
}
void
exerror(int cond, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
exverror(cond, msg, ap);
/* NOTREACHED */
va_end(ap);
}
/*
* error/warning routines for external builtins
*/
void
sh_warnx(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
exvwarning(-1, fmt, ap);
va_end(ap);
}
/*
* Return a string describing an error. The returned string may be a
* pointer to a static buffer that will be overwritten on the next call.
* Action describes the operation that got the error.
*/
const char *
errmsg(int e, int action)
{
if (e != ENOENT && e != ENOTDIR)
return strerror(e);
if (action & E_OPEN)
return "No such file";
else if (action & E_CREAT)
return "Directory nonexistent";
else
return "not found";
}
#ifdef REALLY_SMALL
void
__inton() {
if (--suppressint == 0 && intpending) {
onint();
}
}
#endif
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