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freebsd-skq/bin/sh/error.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
* @(#)error.h 8.2 (Berkeley) 5/4/95
$Id$ -> $FreeBSD$
1999-08-27 23:15:48 +00:00
* $FreeBSD$
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
*/
/*
* We enclose jmp_buf in a structure so that we can declare pointers to
* jump locations. The global variable handler contains the location to
* jump to when an exception occurs, and the global variable exception
Various spelling/formatting changes. Submitted by: Philippe Charnier <charnier@xp11.frmug.org>
1999-05-08 10:22:15 +00:00
* contains a code identifying the exception. To implement nested
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
* exception handlers, the user should save the value of handler on entry
* to an inner scope, set handler to point to a jmploc structure for the
* inner scope, and restore handler on exit from the scope.
*/
#include <setjmp.h>
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
#include <signal.h>
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
struct jmploc {
jmp_buf loc;
};
extern struct jmploc *handler;
Got two volatile sig_atomic_t and int mixed up. Spotted by Gary Palmer.
1998-08-24 19:15:48 +00:00
extern volatile sig_atomic_t exception;
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
/* exceptions */
#define EXINT 0 /* SIGINT received */
#define EXERROR 1 /* a generic error */
sh: Remove special code for shell scripts without magic number. These are called "shell procedures" in the source. If execve() failed with [ENOEXEC], the shell would reinitialize itself and execute the program as a script. This requires a fair amount of code which is not frequently used (most scripts have a #! magic number). Therefore just execute a new instance of sh (_PATH_BSHELL) to run the script.
2011-02-04 22:47:55 +00:00
#define EXEXEC 2 /* command execution failed */
sh: Allow EV_EXIT through function calls, make {...} <redir more consistent. If EV_EXIT causes an exit, use the exception mechanism to unwind redirections and local variables. This way, if the final command is a redirected command, an EXIT trap now executes without the redirections. Because of these changes, EV_EXIT can now be inherited by the body of a function, so do so. This means that a function no longer prevents a fork before an exec being skipped, such as in f() { head -1 /etc/passwd; }; echo $(f) Wrapping a single builtin in a function may still cause an otherwise unnecessary fork with command substitution, however. An exit command or -e failure still invokes the EXIT trap with the original redirections and local variables in place. Note: this depends on SHELLPROC being gone. A SHELLPROC depended on keeping the redirections and local variables and only cleaning up the state to restore them.
2011-04-23 22:28:56 +00:00
#define EXEXIT 3 /* call exitshell(exitstatus) */
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
/*
* These macros allow the user to suspend the handling of interrupt signals
* over a period of time. This is similar to SIGHOLD to or sigblock, but
* much more efficient and portable. (But hacking the kernel is so much
* more fun than worrying about efficiency and portability. :-))
*/
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 volatile sig_atomic_t suppressint;
extern volatile sig_atomic_t intpending;
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
#define INTOFF suppressint++
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
#define INTON { if (--suppressint == 0 && intpending) onint(); }
Fix various things about SIGINT handling: * exception handlers are now run with interrupts disabled, which avoids many race conditions * fix some cases where SIGINT only aborts one command and continues the script, in particular if a SIGINT causes an EINTR error which trumped the interrupt. Example: sh -c 'echo < /some/fifo; echo This should not be printed' The fifo should not have writers. When pressing ctrl+c to abort the open, the shell used to continue with the next command. Example: sh -c '/bin/echo < /some/fifo; echo This should not be printed' Similar. Note, however, that this particular case did not and does not work in interactive mode with job control enabled.
2009-11-22 18:23:30 +00:00
#define is_int_on() suppressint
#define SETINTON(s) suppressint = (s)
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
#define FORCEINTON {suppressint = 0; if (intpending) onint();}
sh: Move some code from onint() to onsig(), making onint() noreturn. As a result, the INTON macro which is used many times generates fewer bytes of code.
2014-12-21 23:09:59 +00:00
#define SET_PENDING_INT intpending = 1
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
#define CLEAR_PENDING_INT intpending = 0
#define int_pending() intpending
sh: Add some __dead2 to indicate functions that do not return.
2009-12-24 20:55:14 +00:00
void exraise(int) __dead2;
sh: Move some code from onint() to onsig(), making onint() noreturn. As a result, the INTON macro which is used many times generates fewer bytes of code.
2014-12-21 23:09:59 +00:00
void onint(void) __dead2;
sh: Add a function to print warnings (with command name and newline). This is like error() but without raising an exception. It is particularly useful as a replacement for the warnx macro in bltin/bltin.h.
2010-12-21 20:47:06 +00:00
void warning(const char *, ...) __printflike(1, 2);
sh: Add some __dead2 to indicate functions that do not return.
2009-12-24 20:55:14 +00:00
void error(const char *, ...) __printf0like(1, 2) __dead2;
void exerror(int, const char *, ...) __printf0like(2, 3) __dead2;
BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00
/*
* BSD setjmp saves the signal mask, which violates ANSI C and takes time,
* so we use _setjmp instead.
*/
#define setjmp(jmploc) _setjmp(jmploc)
#define longjmp(jmploc, val) _longjmp(jmploc, val)
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