Top Forums Programming why multiple SIGINT raises when i hit C-c Post 302356719 by Sedighzadeh on Sunday 27th of September 2009 05:20:13 AM
Old 09-27-2009
why multiple SIGINT raises when i hit C-c


in my application, i have set up to capture SIGINT and execute a handler.the problem is whenever i hit C-c, multiple SIGINT are sent to the application.I have blocked the SIGINT right after catching the first one but it is unsuccessful.Here is what i do :

jmp_buf main_loop;

int main()


sigset_t set;
sigset_t old_set;


sigaddset (&set, SIGINT);

// run other threads ...

while( 1 )
if ( setjmp (main_loop) )
/// Clean up and shut down threads

return 0;


void CleanExit()
shutdownThreads = 1;
longjmp (main_loop, 1);

The problem is the CleanExit method runs 3 to 4 times which means the pthread_sigmask(SIG_BLOCK,&set,&old_set); has not done the job.

So what is the problem?

My application is running in mulinux.

Thanks in advance,

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SIGSETMASK(3)						   BSD Library Functions Manual 					     SIGSETMASK(3)

sigsetmask -- set current signal mask LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <signal.h> int sigsetmask(int mask); sigmask(signum); DESCRIPTION
This interface is made obsolete by: sigprocmask(2). sigsetmask() sets the current signal mask Signals are blocked from delivery if the corresponding bit in mask is a 1; the macro sigmask() is provided to construct the mask for a given signum. The system quietly disallows SIGKILL or SIGSTOP to be blocked. RETURN VALUES
The previous set of masked signals is returned. EXAMPLES
The following example using sigsetmask(): int omask; omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP)); ... sigsetmask(omask & ~(sigmask(SIGINT) | sigmask(SIGHUP))); Could be converted literally to: sigset_t set, oset; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, &oset); ... sigdelset(&oset, SIGINT); sigdelset(&oset, SIGHUP); sigprocmask(SIG_SETMASK, &oset, NULL); Another, clearer, alternative is: sigset_t set; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, NULL); ... sigprocmask(SIG_UNBLOCK, &set, NULL); To completely clear the signal mask using sigsetmask() one can do: (void) sigsetmask(0); Which can be expressed via sigprocmask(2) as: sigset_t eset; sigemptyset(&eset); (void) sigprocmask(SIG_SETMASK, &eset, NULL); SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigsetops(3), sigvec(3) HISTORY
The sigsetmask() function call appeared in 4.2BSD and has been deprecated. BSD
August 10, 2002 BSD

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