#include "postgres.h"
#include "libpq/pqsignal.h"

Include dependency graph for pqsignal.c:

Functions
void	pqinitmask (void)

pqsigfunc	pqsignal_pm (int signo, pqsigfunc func)

Variables
sigset_t	UnBlockSig

sigset_t	BlockSig

sigset_t	StartupBlockSig

Function Documentation

◆ pqinitmask()

void pqinitmask ( void )

Definition at line 41 of file pqsignal.c.

 {
     sigemptyset(&UnBlockSig);
  
     /* Note: InitializeLatchSupport() modifies UnBlockSig. */
  
     /* First set all signals, then clear some. */
     sigfillset(&BlockSig);
     sigfillset(&StartupBlockSig);
  
     /*
      * Unmark those signals that should never be blocked. Some of these signal
      * names don't exist on all platforms.  Most do, but might as well ifdef
      * them all for consistency...
      */
 #ifdef SIGTRAP
     sigdelset(&BlockSig, SIGTRAP);
     sigdelset(&StartupBlockSig, SIGTRAP);
 #endif
 #ifdef SIGABRT
     sigdelset(&BlockSig, SIGABRT);
     sigdelset(&StartupBlockSig, SIGABRT);
 #endif
 #ifdef SIGILL
     sigdelset(&BlockSig, SIGILL);
     sigdelset(&StartupBlockSig, SIGILL);
 #endif
 #ifdef SIGFPE
     sigdelset(&BlockSig, SIGFPE);
     sigdelset(&StartupBlockSig, SIGFPE);
 #endif
 #ifdef SIGSEGV
     sigdelset(&BlockSig, SIGSEGV);
     sigdelset(&StartupBlockSig, SIGSEGV);
 #endif
 #ifdef SIGBUS
     sigdelset(&BlockSig, SIGBUS);
     sigdelset(&StartupBlockSig, SIGBUS);
 #endif
 #ifdef SIGSYS
     sigdelset(&BlockSig, SIGSYS);
     sigdelset(&StartupBlockSig, SIGSYS);
 #endif
 #ifdef SIGCONT
     sigdelset(&BlockSig, SIGCONT);
     sigdelset(&StartupBlockSig, SIGCONT);
 #endif
  
 /* Signals unique to startup */
 #ifdef SIGQUIT
     sigdelset(&StartupBlockSig, SIGQUIT);
 #endif
 #ifdef SIGTERM
     sigdelset(&StartupBlockSig, SIGTERM);
 #endif
 #ifdef SIGALRM
     sigdelset(&StartupBlockSig, SIGALRM);
 #endif
 }

References BlockSig, SIGABRT, SIGALRM, SIGCONT, SIGQUIT, SIGTRAP, StartupBlockSig, and UnBlockSig.

Referenced by InitPostmasterChild(), InitStandaloneProcess(), and PostmasterMain().

◆ pqsignal_pm()

pqsigfunc pqsignal_pm	(	int	signo,
		pqsigfunc	func
	)

Definition at line 120 of file pqsignal.c.

 {
 #ifndef WIN32
     struct sigaction act,
                 oact;
  
     act.sa_handler = func;
     if (func == SIG_IGN || func == SIG_DFL)
     {
         /* in these cases, act the same as pqsignal() */
         sigemptyset(&act.sa_mask);
         act.sa_flags = SA_RESTART;
     }
     else
     {
         act.sa_mask = BlockSig;
         act.sa_flags = 0;
     }
 #ifdef SA_NOCLDSTOP
     if (signo == SIGCHLD)
         act.sa_flags |= SA_NOCLDSTOP;
 #endif
     if (sigaction(signo, &act, &oact) < 0)
         return SIG_ERR;
     return oact.sa_handler;
 #else                           /* WIN32 */
     return pqsignal(signo, func);
 #endif
 }