diff options
Diffstat (limited to 'src/backend/libpq/pqsignal.c')
| -rw-r--r-- | src/backend/libpq/pqsignal.c | 78 |
1 files changed, 40 insertions, 38 deletions
diff --git a/src/backend/libpq/pqsignal.c b/src/backend/libpq/pqsignal.c index 0c91f50df03..727a2a7207d 100644 --- a/src/backend/libpq/pqsignal.c +++ b/src/backend/libpq/pqsignal.c @@ -1,41 +1,41 @@ /*------------------------------------------------------------------------- * * pqsignal.c-- - * reliable BSD-style signal(2) routine stolen from RWW who stole it - * from Stevens... + * reliable BSD-style signal(2) routine stolen from RWW who stole it + * from Stevens... * * Copyright (c) 1994, Regents of the University of California * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/libpq/pqsignal.c,v 1.5 1996/12/26 22:07:08 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/libpq/pqsignal.c,v 1.6 1997/09/07 04:42:29 momjian Exp $ * * NOTES - * This shouldn't be in libpq, but the monitor and some other - * things need it... + * This shouldn't be in libpq, but the monitor and some other + * things need it... * - * A NOTE ABOUT SIGNAL HANDLING ACROSS THE VARIOUS PLATFORMS. + * A NOTE ABOUT SIGNAL HANDLING ACROSS THE VARIOUS PLATFORMS. * - * config.h defines the macro USE_POSIX_SIGNALS for some platforms and - * not for others. This file and pqsignal.h use that macro to decide - * how to handle signalling. + * config.h defines the macro USE_POSIX_SIGNALS for some platforms and + * not for others. This file and pqsignal.h use that macro to decide + * how to handle signalling. * - * signal(2) handling - this is here because it affects some of - * the frontend commands as well as the backend server. - * - * Ultrix and SunOS provide BSD signal(2) semantics by default. - * - * SVID2 and POSIX signal(2) semantics differ from BSD signal(2) - * semantics. We can use the POSIX sigaction(2) on systems that - * allow us to request restartable signals (SA_RESTART). - * - * Some systems don't allow restartable signals at all unless we - * link to a special BSD library. - * - * We devoutly hope that there aren't any systems that provide - * neither POSIX signals nor BSD signals. The alternative - * is to do signal-handler reinstallation, which doesn't work well - * at all. + * signal(2) handling - this is here because it affects some of + * the frontend commands as well as the backend server. + * + * Ultrix and SunOS provide BSD signal(2) semantics by default. + * + * SVID2 and POSIX signal(2) semantics differ from BSD signal(2) + * semantics. We can use the POSIX sigaction(2) on systems that + * allow us to request restartable signals (SA_RESTART). + * + * Some systems don't allow restartable signals at all unless we + * link to a special BSD library. + * + * We devoutly hope that there aren't any systems that provide + * neither POSIX signals nor BSD signals. The alternative + * is to do signal-handler reinstallation, which doesn't work well + * at all. * ------------------------------------------------------------------------*/ #include <postgres.h> @@ -47,18 +47,20 @@ pqsigfunc pqsignal(int signo, pqsigfunc func) { #if !defined(USE_POSIX_SIGNALS) - return signal(signo, func); + return signal(signo, func); #else - struct sigaction act, oact; - - act.sa_handler = func; - sigemptyset(&act.sa_mask); - act.sa_flags = 0; - if (signo != SIGALRM) { - act.sa_flags |= SA_RESTART; - } - if (sigaction(signo, &act, &oact) < 0) - return(SIG_ERR); - return(oact.sa_handler); -#endif /* !USE_POSIX_SIGNALS */ + struct sigaction act, + oact; + + act.sa_handler = func; + sigemptyset(&act.sa_mask); + act.sa_flags = 0; + if (signo != SIGALRM) + { + act.sa_flags |= SA_RESTART; + } + if (sigaction(signo, &act, &oact) < 0) + return (SIG_ERR); + return (oact.sa_handler); +#endif /* !USE_POSIX_SIGNALS */ } |