diff options
Diffstat (limited to 'contrib/sendmail/libsm/signal.c')
| -rw-r--r-- | contrib/sendmail/libsm/signal.c | 340 |
1 files changed, 0 insertions, 340 deletions
diff --git a/contrib/sendmail/libsm/signal.c b/contrib/sendmail/libsm/signal.c deleted file mode 100644 index ce2e242..0000000 --- a/contrib/sendmail/libsm/signal.c +++ /dev/null @@ -1,340 +0,0 @@ -/* - * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. - * 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. - */ - -#include <sm/gen.h> -SM_RCSID("@(#)$Id: signal.c,v 1.17 2005/06/14 23:07:20 ca Exp $") - -#if SM_CONF_SETITIMER -# include <sm/time.h> -#endif /* SM_CONF_SETITIMER */ -#include <errno.h> -#include <stdlib.h> -#include <time.h> -#include <unistd.h> -#include <sm/clock.h> -#include <sm/signal.h> -#include <signal.h> -#include <sm/string.h> - -unsigned int volatile InCriticalSection; /* >0 if inside critical section */ -int volatile PendingSignal; /* pending signal to resend */ - -/* -** SM_SIGNAL -- set a signal handler -** -** This is essentially old BSD "signal(3)". -** -** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD -** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE -** DOING. -*/ - -sigfunc_t -sm_signal(sig, handler) - int sig; - sigfunc_t handler; -{ -# if defined(SA_RESTART) || (!defined(SYS5SIGNALS) && !defined(BSD4_3)) - struct sigaction n, o; -# endif /* defined(SA_RESTART) || (!defined(SYS5SIGNALS) && !defined(BSD4_3)) */ - - /* - ** First, try for modern signal calls - ** and restartable syscalls - */ - -# ifdef SA_RESTART - (void) memset(&n, '\0', sizeof n); -# if USE_SA_SIGACTION - n.sa_sigaction = (void(*)(int, siginfo_t *, void *)) handler; - n.sa_flags = SA_RESTART|SA_SIGINFO; -# else /* USE_SA_SIGACTION */ - n.sa_handler = handler; - n.sa_flags = SA_RESTART; -# endif /* USE_SA_SIGACTION */ - if (sigaction(sig, &n, &o) < 0) - return SIG_ERR; - return o.sa_handler; -# else /* SA_RESTART */ - - /* - ** Else check for SYS5SIGNALS or - ** BSD4_3 signals - */ - -# if defined(SYS5SIGNALS) || defined(BSD4_3) -# ifdef BSD4_3 - return signal(sig, handler); -# else /* BSD4_3 */ - return sigset(sig, handler); -# endif /* BSD4_3 */ -# else /* defined(SYS5SIGNALS) || defined(BSD4_3) */ - - /* - ** Finally, if nothing else is available, - ** go for a default - */ - - (void) memset(&n, '\0', sizeof n); - n.sa_handler = handler; - if (sigaction(sig, &n, &o) < 0) - return SIG_ERR; - return o.sa_handler; -# endif /* defined(SYS5SIGNALS) || defined(BSD4_3) */ -# endif /* SA_RESTART */ -} -/* -** SM_BLOCKSIGNAL -- hold a signal to prevent delivery -** -** Parameters: -** sig -- the signal to block. -** -** Returns: -** 1 signal was previously blocked -** 0 signal was not previously blocked -** -1 on failure. -*/ - -int -sm_blocksignal(sig) - int sig; -{ -# ifdef BSD4_3 -# ifndef sigmask -# define sigmask(s) (1 << ((s) - 1)) -# endif /* ! sigmask */ - return (sigblock(sigmask(sig)) & sigmask(sig)) != 0; -# else /* BSD4_3 */ -# ifdef ALTOS_SYSTEM_V - sigfunc_t handler; - - handler = sigset(sig, SIG_HOLD); - if (handler == SIG_ERR) - return -1; - else - return handler == SIG_HOLD; -# else /* ALTOS_SYSTEM_V */ - sigset_t sset, oset; - - (void) sigemptyset(&sset); - (void) sigaddset(&sset, sig); - if (sigprocmask(SIG_BLOCK, &sset, &oset) < 0) - return -1; - else - return sigismember(&oset, sig); -# endif /* ALTOS_SYSTEM_V */ -# endif /* BSD4_3 */ -} -/* -** SM_RELEASESIGNAL -- release a held signal -** -** Parameters: -** sig -- the signal to release. -** -** Returns: -** 1 signal was previously blocked -** 0 signal was not previously blocked -** -1 on failure. -*/ - -int -sm_releasesignal(sig) - int sig; -{ -# ifdef BSD4_3 - return (sigsetmask(sigblock(0) & ~sigmask(sig)) & sigmask(sig)) != 0; -# else /* BSD4_3 */ -# ifdef ALTOS_SYSTEM_V - sigfunc_t handler; - - handler = sigset(sig, SIG_HOLD); - if (sigrelse(sig) < 0) - return -1; - else - return handler == SIG_HOLD; -# else /* ALTOS_SYSTEM_V */ - sigset_t sset, oset; - - (void) sigemptyset(&sset); - (void) sigaddset(&sset, sig); - if (sigprocmask(SIG_UNBLOCK, &sset, &oset) < 0) - return -1; - else - return sigismember(&oset, sig); -# endif /* ALTOS_SYSTEM_V */ -# endif /* BSD4_3 */ -} -/* -** PEND_SIGNAL -- Add a signal to the pending signal list -** -** Parameters: -** sig -- signal to add -** -** Returns: -** none. -** -** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD -** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE -** DOING. -*/ - -void -pend_signal(sig) - int sig; -{ - int sigbit; - int save_errno = errno; -#if SM_CONF_SETITIMER - struct itimerval clr; -#endif /* SM_CONF_SETITIMER */ - - /* - ** Don't want to interrupt something critical, hence delay - ** the alarm for one second. Hopefully, by then we - ** will be out of the critical section. If not, then - ** we will just delay again. The events to be run will - ** still all be run, maybe just a little bit late. - */ - - switch (sig) - { - case SIGHUP: - sigbit = PEND_SIGHUP; - break; - - case SIGINT: - sigbit = PEND_SIGINT; - break; - - case SIGTERM: - sigbit = PEND_SIGTERM; - break; - - case SIGUSR1: - sigbit = PEND_SIGUSR1; - break; - - case SIGALRM: - /* don't have to pend these */ - sigbit = 0; - break; - - default: - /* If we get here, we are in trouble */ - abort(); - - /* NOTREACHED */ - /* shut up stupid compiler warning on HP-UX 11 */ - sigbit = 0; - break; - } - - if (sigbit != 0) - PendingSignal |= sigbit; - (void) sm_signal(SIGALRM, sm_tick); -#if SM_CONF_SETITIMER - clr.it_interval.tv_sec = 0; - clr.it_interval.tv_usec = 0; - clr.it_value.tv_sec = 1; - clr.it_value.tv_usec = 0; - (void) setitimer(ITIMER_REAL, &clr, NULL); -#else /* SM_CONF_SETITIMER */ - (void) alarm(1); -#endif /* SM_CONF_SETITIMER */ - errno = save_errno; -} -/* -** SM_ALLSIGNALS -- act on all signals -** -** Parameters: -** block -- whether to block or release all signals. -** -** Returns: -** none. -*/ - -void -sm_allsignals(block) - bool block; -{ -# ifdef BSD4_3 -# ifndef sigmask -# define sigmask(s) (1 << ((s) - 1)) -# endif /* ! sigmask */ - if (block) - { - int mask = 0; - - mask |= sigmask(SIGALRM); - mask |= sigmask(SIGCHLD); - mask |= sigmask(SIGHUP); - mask |= sigmask(SIGINT); - mask |= sigmask(SIGTERM); - mask |= sigmask(SIGUSR1); - - (void) sigblock(mask); - } - else - sigsetmask(0); -# else /* BSD4_3 */ -# ifdef ALTOS_SYSTEM_V - if (block) - { - (void) sigset(SIGALRM, SIG_HOLD); - (void) sigset(SIGCHLD, SIG_HOLD); - (void) sigset(SIGHUP, SIG_HOLD); - (void) sigset(SIGINT, SIG_HOLD); - (void) sigset(SIGTERM, SIG_HOLD); - (void) sigset(SIGUSR1, SIG_HOLD); - } - else - { - (void) sigset(SIGALRM, SIG_DFL); - (void) sigset(SIGCHLD, SIG_DFL); - (void) sigset(SIGHUP, SIG_DFL); - (void) sigset(SIGINT, SIG_DFL); - (void) sigset(SIGTERM, SIG_DFL); - (void) sigset(SIGUSR1, SIG_DFL); - } -# else /* ALTOS_SYSTEM_V */ - sigset_t sset; - - (void) sigemptyset(&sset); - (void) sigaddset(&sset, SIGALRM); - (void) sigaddset(&sset, SIGCHLD); - (void) sigaddset(&sset, SIGHUP); - (void) sigaddset(&sset, SIGINT); - (void) sigaddset(&sset, SIGTERM); - (void) sigaddset(&sset, SIGUSR1); - (void) sigprocmask(block ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); -# endif /* ALTOS_SYSTEM_V */ -# endif /* BSD4_3 */ -} -/* -** SM_SIGNAL_NOOP -- A signal no-op function -** -** Parameters: -** sig -- signal received -** -** Returns: -** SIGFUNC_RETURN -*/ - -/* ARGSUSED */ -SIGFUNC_DECL -sm_signal_noop(sig) - int sig; -{ - int save_errno = errno; - - FIX_SYSV_SIGNAL(sig, sm_signal_noop); - errno = save_errno; - return SIGFUNC_RETURN; -} - |
