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sigsuspend(2) [freebsd man page]

SIGSUSPEND(2)						      BSD System Calls Manual						     SIGSUSPEND(2)

sigsuspend -- atomically release blocked signals and wait for interrupt LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <signal.h> int sigsuspend(const sigset_t *sigmask); DESCRIPTION
The sigsuspend() system call temporarily changes the blocked signal mask to the set to which sigmask points, and then waits for a signal to arrive; on return the previous set of masked signals is restored. The signal mask set is usually empty to indicate that all signals are to be unblocked for the duration of the call. In normal usage, a signal is blocked using sigprocmask(2) to begin a critical section, variables modified on the occurrence of the signal are examined to determine that there is no work to be done, and the process pauses awaiting work by using sigsuspend() with the previous mask returned by sigprocmask(2). RETURN VALUES
The sigsuspend() system call always terminates by being interrupted, returning -1 with errno set to EINTR. SEE ALSO
pselect(2), sigaction(2), sigpending(2), sigprocmask(2), sigtimedwait(2), sigwait(2), sigwaitinfo(2), sigsetops(3) STANDARDS
The sigsuspend() system call is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1''). BSD
August 16, 2013 BSD

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

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 sig- nal 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
Normally, sigsuspend() is used in conjunction with sigprocmask(2) in order to prevent delivery of a signal during the execution of a criti- cal 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), signal(7) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2013-04-19 SIGSUSPEND(2)
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