SIGSUSPEND(2) System Calls Manual SIGSUSPEND(2)NAME
sigsuspend - suspend until signalled
int sigsuspend(const sigset_t *set)
Sigsuspend() installs the signal mask referenced by set and suspends the process until signalled. The signal is handled, the signal mask
is restored to the value it had before the sigsuspend() call and call returns.
SEE ALSO pause(2), sigaction(2), sigpending(2), sigprocmask(2), sigset(3).
Sigsuspend() never returns normally, so it always returns -1. The error code is either EINTR indicating that a signal has arrived, or
EFAULT for a bad set address.
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SIGSUSPEND(2) Linux Programmer's Manual SIGSUSPEND(2)NAME
sigsuspend - wait for a signal
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
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.
sigsuspend() always returns -1, normally with the error EINTR.
EFAULT mask points to memory which is not a valid part of the process address space.
EINTR The call was interrupted by a signal.
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
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Linux 2008-08-29 SIGSUSPEND(2)