gs_signal.c File Reference

#include <signal.h>
#include "utility.h"

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Defines
#define	gs_do_setup(s, f)
Functions
Sigfunc *	gs_signal (int signo, Sigfunc *func)
int	gs_setup_signal_handlers (Sigfunc *func)

---

Detailed Description

Signal handling code for GridSolve.

Definition in file gs_signal.c.

---

Define Documentation

#define gs_do_setup	(	s,
		f		)

Value:

if(gs_signal(s, f) == SIG_ERR) { \
    failure_seen = 1; \
    ERRPRINTF("Warning: could not set up signal handler (sig = %d)\n",s); \
  }

---

Function Documentation

int gs_setup_signal_handlers

(

Sigfunc *

func

)

Register the specified function as a signal handler for lots of different signals.

Parameters:

func

-- the signal handler

Returns:

0 on sucess, -1 on failure.

Definition at line 67 of file gs_signal.c.

{
  int failure_seen = 0;

#define gs_do_setup(s, f) \
  if(gs_signal(s, f) == SIG_ERR) { \
    failure_seen = 1; \
    ERRPRINTF("Warning: could not set up signal handler (sig = %d)\n",s); \
  }

#ifdef SIGHUP
  gs_do_setup(SIGHUP, func);
#endif
#ifdef SIGINT
  gs_do_setup(SIGINT, func);
#endif
#ifdef SIGQUIT
  gs_do_setup(SIGQUIT, func);
#endif
#ifdef SIGILL
  gs_do_setup(SIGILL, func);
#endif
#ifdef SIGTRAP
  gs_do_setup(SIGTRAP, func);
#endif
#ifdef SIGABRT
  gs_do_setup(SIGABRT, func);
#endif
#ifdef SIGEMT
  gs_do_setup(SIGEMT, func);
#endif
#ifdef SIGFPE
  gs_do_setup(SIGFPE, func);
#endif
#ifdef SIGBUS
  gs_do_setup(SIGBUS, func);
#endif
#ifdef SIGSEGV
  gs_do_setup(SIGSEGV, func);
#endif
#ifdef SIGSYS
  gs_do_setup(SIGSYS, func);
#endif
#ifdef SIGPIPE
  gs_do_setup(SIGPIPE, func);
#endif
#ifdef SIGALRM
  gs_do_setup(SIGALRM, func);
#endif
#ifdef SIGTERM
  gs_do_setup(SIGTERM, func);
#endif
#ifdef SIGTSTP
  gs_do_setup(SIGTSTP, func);
#endif
#ifdef SIGTTIN
  gs_do_setup(SIGTTIN, func);
#endif
#ifdef SIGTTOU
  gs_do_setup(SIGTTOU, func);
#endif
#ifdef SIGXCPU
  gs_do_setup(SIGXCPU, func);
#endif
#ifdef SIGXFSZ
  gs_do_setup(SIGXFSZ, func);
#endif
#ifdef SIGVTALRM
  gs_do_setup(SIGVTALRM, func);
#endif
#ifdef SIGPROF
  gs_do_setup(SIGPROF, func);
#endif
#ifdef SIGUSR1
  gs_do_setup(SIGUSR1, func);
#endif
#ifdef SIGUSR2
  gs_do_setup(SIGUSR2, func);
#endif

  return failure_seen;
}

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Sigfunc* gs_signal	(	int	signo,
		Sigfunc *	func
	)

This is a wrapper around sigaction that sets the SA_RESTART flag so that system calls are restarted after being interrupted. This code was taken from page 120 of "Unix Network Programming" by W. Richard Stevens.

Parameters:

	signal	-- the signal number that should be handled
	func	-- the function to be called when the specified signal is caught

Returns:

the previous value of the signal handler, or SIG_ERR on error.

Definition at line 28 of file gs_signal.c.

{
#ifdef WIN32

  signal(signo, func);
  return func;

#else
  struct sigaction act, oact;

  act.sa_handler = func;
  sigemptyset(&act.sa_mask);
  act.sa_flags = 0;
  if (signo == SIGALRM) {
#ifdef  SA_INTERRUPT
    act.sa_flags |= SA_INTERRUPT;   /* SunOS 4.x */
#endif
  } else {
#ifdef  SA_RESTART
    act.sa_flags |= SA_RESTART;     /* SVR4, 44BSD */
#endif
  }
  if(sigaction(signo, &act, &oact) < 0)
    return(SIG_ERR);
  return(oact.sa_handler);

#endif  /* ifdef WIN32 */
}

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