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/*
* Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
* All rights reserved.
* Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved.
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
* $Id: signal.h,v 1.16 2001/07/20 19:48:21 gshapiro Exp $
*/
/*
** SIGNAL.H -- libsm (and sendmail) signal facilities
** Extracted from sendmail/conf.h and focusing
** on signal configuration.
*/
#ifndef SM_SIGNAL_H
#define SM_SIGNAL_H 1
#include <sys/types.h>
#include <limits.h>
#include <signal.h>
#include <sm/cdefs.h>
#include <sm/conf.h>
/*
** Critical signal sections
*/
#define PEND_SIGHUP 0x0001
#define PEND_SIGINT 0x0002
#define PEND_SIGTERM 0x0004
#define PEND_SIGUSR1 0x0008
#define ENTER_CRITICAL() InCriticalSection++
#define LEAVE_CRITICAL() \
do \
{ \
if (InCriticalSection > 0) \
InCriticalSection--; \
} while (0)
#define CHECK_CRITICAL(sig) \
do \
{ \
if (InCriticalSection > 0 && (sig) != 0) \
{ \
pend_signal((sig)); \
return SIGFUNC_RETURN; \
} \
} while (0)
/* variables */
extern unsigned int volatile InCriticalSection; /* >0 if in critical section */
extern int volatile PendingSignal; /* pending signal to resend */
/* functions */
extern void pend_signal __P((int));
/* reset signal in case System V semantics */
#ifdef SYS5SIGNALS
# define FIX_SYSV_SIGNAL(sig, handler) \
{ \
if ((sig) != 0) \
(void) sm_signal((sig), (handler)); \
}
#else /* SYS5SIGNALS */
# define FIX_SYSV_SIGNAL(sig, handler) { /* EMPTY */ }
#endif /* SYS5SIGNALS */
extern void sm_allsignals __P((bool));
extern int sm_blocksignal __P((int));
extern int sm_releasesignal __P((int));
extern sigfunc_t sm_signal __P((int, sigfunc_t));
extern SIGFUNC_DECL sm_signal_noop __P((int));
#endif /* SM_SIGNAL_H */
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