SIGSUSPEND

 

NAME

sigsuspend – wait for a signal  

SYNOPSIS

#include <signal.h>

int sigsuspend(const sigset_t *mask);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

sigsuspend(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE  

DESCRIPTION

sigsuspend() temporarily replaces the signal mask of the calling process with the mask given by mask and then suspends the process until delivery of a signal whose action is to invoke a signal handler or to terminate a process.

If the signal terminates the process, then sigsuspend() does not return. If the signal is caught, then sigsuspend() returns after the signal handler returns, and the signal mask is restored to the state before the call to sigsuspend().

It is not possible to block SIGKILL or SIGSTOP; specifying these signals in mask, has no effect on the process’s signal mask.  

RETURN VALUE

sigsuspend() always returns -1, with errno set to indicate the error (normally, EINTR).  

ERRORS

EFAULT

mask points to memory which is not a valid part of the process address space.

EINTR

The call was interrupted by a signal.

 

CONFORMING TO

POSIX.1-2001.  

NOTES