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Diffstat (limited to 'Src/signals.h')
| -rw-r--r-- | Src/signals.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/Src/signals.h b/Src/signals.h new file mode 100644 index 000000000..b6485e6b3 --- /dev/null +++ b/Src/signals.h @@ -0,0 +1,94 @@ +/* + * 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(signal_mask(SIGCHLD)) +#define child_unblock() signal_unblock(signal_mask(SIGCHLD)) +#define child_suspend(S) signal_suspend(SIGCHLD, S) + +/* 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. */ + +/* Right now I'm queueing all signals, but maybe we only * + * need to queue SIGCHLD. Anybody know? */ + +#define MAX_QUEUE_SIZE 16 + +#define queue_signals() (queueing_enabled++) + +#define unqueue_signals() do { \ + DPUTS(!queueing_enabled, "BUG: unqueue_signals called but not queueing"); \ + if (!--queueing_enabled) { \ + 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]); \ + handler(signal_queue[queue_front]); /* handle queued signal */ \ + signal_setmask(oset); \ + } \ + } \ +} while (0) |