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/*
* signals.h - header file for signals handling code
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1992-1997 Paul Falstad
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Paul Falstad or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Paul Falstad and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Paul Falstad and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Paul Falstad and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#define SIGNAL_HANDTYPE RETSIGTYPE (*)_((int))
#ifndef HAVE_KILLPG
# define killpg(pgrp,sig) kill(-(pgrp),sig)
#endif
#define SIGZERR (SIGCOUNT+1)
#define SIGDEBUG (SIGCOUNT+2)
#define VSIGCOUNT (SIGCOUNT+3)
#define SIGEXIT 0
#ifdef SV_BSDSIG
# define SV_INTERRUPT SV_BSDSIG
#endif
/* If not a POSIX machine, then we create our *
* own POSIX style signal sets functions. */
#ifndef POSIX_SIGNALS
# define sigemptyset(s) (*(s) = 0)
# if NSIG == 32
# define sigfillset(s) (*(s) = ~(sigset_t)0, 0)
# else
# define sigfillset(s) (*(s) = (1 << NSIG) - 1, 0)
# endif
# define sigaddset(s,n) (*(s) |= (1 << ((n) - 1)), 0)
# define sigdelset(s,n) (*(s) &= ~(1 << ((n) - 1)), 0)
# define sigismember(s,n) ((*(s) & (1 << ((n) - 1))) != 0)
#endif /* ifndef POSIX_SIGNALS */
#define child_block() signal_block(sigchld_mask)
#define child_unblock() signal_unblock(sigchld_mask)
#ifdef SIGWINCH
# define winch_block() signal_block(signal_mask(SIGWINCH))
# define winch_unblock() signal_unblock(signal_mask(SIGWINCH))
#else
# define winch_block() 0
# define winch_unblock() 0
#endif
/* ignore a signal */
#define signal_ignore(S) signal(S, SIG_IGN)
/* return a signal to it default action */
#define signal_default(S) signal(S, SIG_DFL)
/* Use a circular queue to save signals caught during *
* critical sections of code. You call queue_signals to *
* start queueing, and unqueue_signals to process the *
* queue and stop queueing. Since the kernel doesn't *
* queue signals, it is probably overkill for zsh to do *
* this, but it shouldn't hurt anything to do it anyway. */
#define MAX_QUEUE_SIZE 128
#define run_queued_signals() do { \
while (queue_front != queue_rear) { /* while signals in queue */ \
sigset_t oset; \
queue_front = (queue_front + 1) % MAX_QUEUE_SIZE; \
oset = signal_setmask(signal_mask_queue[queue_front]); \
zhandler(signal_queue[queue_front]); /* handle queued signal */ \
signal_setmask(oset); \
} \
} while (0)
#ifdef DEBUG
#define queue_signals() (queue_in++, queueing_enabled++)
#define unqueue_signals() do { \
DPUTS(!queueing_enabled, "BUG: unqueue_signals called but not queueing"); \
--queue_in; \
if (!--queueing_enabled) run_queued_signals(); \
} while (0)
#define dont_queue_signals() do { \
queue_in = queueing_enabled; \
queueing_enabled = 0; \
run_queued_signals(); \
} while (0)
#define restore_queue_signals(q) do { \
DPUTS2(queueing_enabled && queue_in != q, \
"BUG: q = %d != queue_in = %d", q, queue_in); \
queue_in = (queueing_enabled = (q)); \
} while (0)
#else /* !DEBUG */
#define queue_signals() (queueing_enabled++)
#define unqueue_signals() do { \
if (!--queueing_enabled) run_queued_signals(); \
} while (0)
#define dont_queue_signals() do { \
queueing_enabled = 0; \
run_queued_signals(); \
} while (0)
#define restore_queue_signals(q) (queueing_enabled = (q))
#endif /* DEBUG */
#define queue_signal_level() queueing_enabled
#ifdef BSD_SIGNALS
#define signal_block(S) sigblock(S)
#else
extern sigset_t signal_block _((sigset_t));
#endif /* BSD_SIGNALS */
extern sigset_t signal_unblock _((sigset_t));
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