sigwait - wait for a signal
int sigwait(const sigset_t *set, int *sig);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
sigwait(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
The sigwait() function suspends execution of the calling thread until one of the signals specified in the signal set set becomes pending. The function accepts the signal (removes it from the pending list of signals), and returns the signal number in sig.
The operation of sigwait() is the same as sigwaitinfo(2), except that:
* sigwait() only returns the signal number, rather than a siginfo_t structure describing the signal. * The return values of the two functions are different.
On success, sigwait() returns 0. On error, it returns a positive error number (listed in ERRORS).
EINVAL set contains an invalid signal number.
sigwait() is implemented using sigtimedwait(2).
sigaction(2), signalfd(2), sigpending(2), sigsuspend(2), sigwaitinfo(2), sigsetops(3), signal(7)
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