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CentOS 7.0 - man page for rt_sigsuspend (centos section 2)

SIGSUSPEND(2)				      Linux Programmer's Manual 				SIGSUSPEND(2)

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 sig- suspend() 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 inndicate 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
Normally, sigsuspend() is used in conjunction with sigprocmask(2) in order to prevent delivery of a signal during the execution of a critical code section. The caller first blocks the signals with sigprocmask(2). When the critical code has completed, the caller then waits for the signals by calling sigsuspend() with the signal mask that was returned by sigprocmask(2) (in the oldset argument). See sigsetops(3) for details on manipulating signal sets.
SEE ALSO
kill(2), pause(2), sigaction(2), signal(2), sigprocmask(2), sigwaitinfo(2), sigsetops(3), sigwait(3), sig- nal(7)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2013-04-19 SIGSUSPEND(2)


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