sigwait - wait for a signal
int sigwait(const sigset_t *set, int *sig);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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:
Since glibc 2.26:
_POSIX_C_SOURCE >= 199506L
Glibc 2.25 and earlier:
- sigwait() returns only the signal number, rather than a siginfo_t structure describing the signal.
On success, sigwait() returns 0. On error, it returns a positive error number (listed in ERRORS).
- The return values of the two functions are different.
For an explanation of the terms used in this section, see attributes(7).
- set contains an invalid signal number.
sigwait() is implemented using sigtimedwait(2).
The glibc implementation of sigwait() silently ignores attempts to wait for the two real-time signals that are used internally by the NPTL threading implementation. See nptl(7) for details.
|Interface ||Attribute ||Value |
|sigwait () ||Thread safety ||MT-Safe |