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45496405c6
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.
95 lines
3.6 KiB
C
95 lines
3.6 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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* @(#)error.h 8.2 (Berkeley) 5/4/95
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* $FreeBSD$
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*/
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/*
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* We enclose jmp_buf in a structure so that we can declare pointers to
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* jump locations. The global variable handler contains the location to
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* jump to when an exception occurs, and the global variable exception
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* contains a code identifying the exception. To implement nested
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* exception handlers, the user should save the value of handler on entry
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* to an inner scope, set handler to point to a jmploc structure for the
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* inner scope, and restore handler on exit from the scope.
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*/
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#include <setjmp.h>
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#include <signal.h>
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struct jmploc {
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jmp_buf loc;
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};
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extern struct jmploc *handler;
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extern volatile sig_atomic_t exception;
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/* exceptions */
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#define EXINT 0 /* SIGINT received */
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#define EXERROR 1 /* a generic error */
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#define EXEXEC 2 /* command execution failed */
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#define EXEXIT 3 /* call exitshell(exitstatus) */
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/*
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* These macros allow the user to suspend the handling of interrupt signals
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* over a period of time. This is similar to SIGHOLD to or sigblock, but
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* much more efficient and portable. (But hacking the kernel is so much
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* more fun than worrying about efficiency and portability. :-))
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*/
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extern volatile sig_atomic_t suppressint;
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extern volatile sig_atomic_t intpending;
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#define INTOFF suppressint++
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#define INTON { if (--suppressint == 0 && intpending) onint(); }
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#define is_int_on() suppressint
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#define SETINTON(s) suppressint = (s)
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#define FORCEINTON {suppressint = 0; if (intpending) onint();}
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#define CLEAR_PENDING_INT intpending = 0
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#define int_pending() intpending
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void exraise(int) __dead2;
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void onint(void);
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void warning(const char *, ...) __printflike(1, 2);
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void error(const char *, ...) __printf0like(1, 2) __dead2;
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void exerror(int, const char *, ...) __printf0like(2, 3) __dead2;
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/*
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* BSD setjmp saves the signal mask, which violates ANSI C and takes time,
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* so we use _setjmp instead.
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*/
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#define setjmp(jmploc) _setjmp(jmploc)
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#define longjmp(jmploc, val) _longjmp(jmploc, val)
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