120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* pqsignal.c
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* Backend signal(2) support (see also src/port/pqsignal.c)
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*
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* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/libpq/pqsignal.c
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*
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* ------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "libpq/pqsignal.h"
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#ifdef HAVE_SIGPROCMASK
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sigset_t UnBlockSig,
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BlockSig,
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StartupBlockSig;
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#else
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int UnBlockSig,
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BlockSig,
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StartupBlockSig;
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#endif
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/*
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* Initialize BlockSig, UnBlockSig, and StartupBlockSig.
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*
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* BlockSig is the set of signals to block when we are trying to block
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* signals. This includes all signals we normally expect to get, but NOT
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* signals that should never be turned off.
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*
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* StartupBlockSig is the set of signals to block during startup packet
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* collection; it's essentially BlockSig minus SIGTERM, SIGQUIT, SIGALRM.
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*
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* UnBlockSig is the set of signals to block when we don't want to block
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* signals (is this ever nonzero??)
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*/
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void
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pqinitmask(void)
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{
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#ifdef HAVE_SIGPROCMASK
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sigemptyset(&UnBlockSig);
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/* First set all signals, then clear some. */
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sigfillset(&BlockSig);
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sigfillset(&StartupBlockSig);
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/*
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* Unmark those signals that should never be blocked. Some of these signal
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* names don't exist on all platforms. Most do, but might as well ifdef
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* them all for consistency...
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*/
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#ifdef SIGTRAP
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sigdelset(&BlockSig, SIGTRAP);
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sigdelset(&StartupBlockSig, SIGTRAP);
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#endif
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#ifdef SIGABRT
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sigdelset(&BlockSig, SIGABRT);
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sigdelset(&StartupBlockSig, SIGABRT);
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#endif
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#ifdef SIGILL
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sigdelset(&BlockSig, SIGILL);
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sigdelset(&StartupBlockSig, SIGILL);
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#endif
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#ifdef SIGFPE
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sigdelset(&BlockSig, SIGFPE);
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sigdelset(&StartupBlockSig, SIGFPE);
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#endif
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#ifdef SIGSEGV
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sigdelset(&BlockSig, SIGSEGV);
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sigdelset(&StartupBlockSig, SIGSEGV);
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#endif
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#ifdef SIGBUS
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sigdelset(&BlockSig, SIGBUS);
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sigdelset(&StartupBlockSig, SIGBUS);
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#endif
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#ifdef SIGSYS
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sigdelset(&BlockSig, SIGSYS);
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sigdelset(&StartupBlockSig, SIGSYS);
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#endif
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#ifdef SIGCONT
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sigdelset(&BlockSig, SIGCONT);
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sigdelset(&StartupBlockSig, SIGCONT);
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#endif
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/* Signals unique to startup */
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#ifdef SIGQUIT
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sigdelset(&StartupBlockSig, SIGQUIT);
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#endif
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#ifdef SIGTERM
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sigdelset(&StartupBlockSig, SIGTERM);
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#endif
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#ifdef SIGALRM
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sigdelset(&StartupBlockSig, SIGALRM);
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#endif
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#else
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/* Set the signals we want. */
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UnBlockSig = 0;
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BlockSig = sigmask(SIGQUIT) |
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sigmask(SIGTERM) | sigmask(SIGALRM) |
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/* common signals between two */
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sigmask(SIGHUP) |
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sigmask(SIGINT) | sigmask(SIGUSR1) |
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sigmask(SIGUSR2) | sigmask(SIGCHLD) |
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sigmask(SIGWINCH) | sigmask(SIGFPE);
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StartupBlockSig = sigmask(SIGHUP) |
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sigmask(SIGINT) | sigmask(SIGUSR1) |
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sigmask(SIGUSR2) | sigmask(SIGCHLD) |
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sigmask(SIGWINCH) | sigmask(SIGFPE);
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#endif
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}
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