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freebsd/bin/sh/trap.h

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BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
/*-
* 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.
* 4. 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.
*
Merge of 4.4-Lite2 sh source, plus some gcc -Wall cleaning. This is a merge of parallel duplicate work by Steve Price and myself. :-] There are some changes to the build that are my fault... mkinit.c was trying (poorly) to duplicate some of the work that make(1) is designed to do. The Makefile hackery is my fault too, the depend list was incomplete because of some explicit OBJS+= entries, so mkdep wasn't picking up their source file #includes. This closes a pile of /bin/sh PR's, but not all of them.. Submitted by: Steve Price <steve@bonsai.hiwaay.net>, peter
1996-09-01 10:22:36 +00:00
* @(#)trap.h 8.3 (Berkeley) 6/5/95
$Id$ -> $FreeBSD$
1999-08-27 23:15:48 +00:00
* $FreeBSD$
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
*/
sh: If a SIGINT or SIGQUIT interrupts "wait", return status 128+sig.
2013-02-23 22:50:57 +00:00
extern volatile sig_atomic_t pendingsig;
Do not exit on SIGINT in non-interactive shells, fixes PR 1206, i.e. this makes emacs usable from system(3). Programs called from shellscripts are now required to exit with proper signal status. That means, they have to kill themself. Exiting with faked numerical exit code is not sufficient. Exit with proper signal status if script exits on signal. Make the wait builtin interruptable, both with and without traps set. Use volatile sig_atomic_t where (and only where) appropriate. (Almost) fix printing of newlines on SIGINT. Make traps setable from trap handlers. This is needed for shellscripts that catch SIGINT for cleanup work but intend to exit on it, hance have to kill themself from a trap handler. I.e. mkdep. While I'm at it, make it -Wall clean. -Wall is not enabled in Makefile, since vararg warnx() macro calls in usr.bin/printf/printf.c are not -Wall-able. PR: 1206 Obtained from: Basic SIGINT fix from Bruce Evans
1998-08-24 10:20:37 +00:00
extern int in_dotrap;
Avoid calling el_resize() from a signal handler, even though libedit itself does that if you set EL_SIGNAL. Instead, set a flag and check it before calling el_gets(). This is safer, but slower to respond to changes. Pointed out by: mp
2002-07-24 02:06:07 +00:00
extern volatile sig_atomic_t gotwinch;
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
o __P has been reoved o Old-style K&R declarations have been converted to new C89 style o register has been removed o prototype for main() has been removed (gcc3 makes it an error) o int main(int argc, char *argv[]) is the preferred main definition. o Attempt to not break style(9) conformance for declarations more than they already are. o Change int foo() { ... to int foo(void) { ...
2002-02-02 06:50:57 +00:00
void clear_traps(void);
Don't skip forking for an external command if any traps are active. Example: sh -c '(trap "echo trapped" EXIT; sleep 3)' now correctly prints "trapped". With this check, it is no longer necessary to check for -T explicitly in that case. This is a useful bugfix by itself and also important because I plan to skip forking more often. PR: bin/113860 (part of) PR: bin/74404 (part of) Reviewed by: stefanf Approved by: ed (mentor)
2009-06-13 21:10:41 +00:00
int have_traps(void);
o __P has been reoved o Old-style K&R declarations have been converted to new C89 style o register has been removed o prototype for main() has been removed (gcc3 makes it an error) o int main(int argc, char *argv[]) is the preferred main definition. o Attempt to not break style(9) conformance for declarations more than they already are. o Change int foo() { ... to int foo(void) { ...
2002-02-02 06:50:57 +00:00
void setsignal(int);
void ignoresig(int);
sh: Fix EINTR race condition in "wait" and "set -T" using sigsuspend(). When waiting for child processes using "wait" or if "set -T" is in effect, a signal interrupts the wait. Make sure there is no window where the signal handler may be invoked (setting a flag) just before going to sleep. There is a similar race condition in the shell language, but scripts can avoid it by exiting from the trap handler or enforcing synchronization using a fifo. If SIGCHLD is not trapped, a signal handler must be installed for it. Only install this handler for the duration of the wait to avoid triggering unexpected [EINTR] errors elsewhere. Note that for some reason only SIGINT and SIGQUIT interrupt a "wait" command. This remains the case.
2012-07-29 18:04:38 +00:00
int issigchldtrapped(void);
o __P has been reoved o Old-style K&R declarations have been converted to new C89 style o register has been removed o prototype for main() has been removed (gcc3 makes it an error) o int main(int argc, char *argv[]) is the preferred main definition. o Attempt to not break style(9) conformance for declarations more than they already are. o Change int foo() { ... to int foo(void) { ...
2002-02-02 06:50:57 +00:00
void onsig(int);
void dotrap(void);
void setinteractive(int);
sh: Add some __dead2 to indicate functions that do not return.
2009-12-24 20:55:14 +00:00
void exitshell(int) __dead2;
sh: Make exit without parameters from EXIT trap POSIX-compliant. It should use the original exit status, just like falling off the end of the trap handler. Outside an EXIT trap, 'exit' is still equivalent to 'exit $?'.
2011-01-08 23:08:13 +00:00
void exitshell_savedstatus(void) __dead2;
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