Manpages - sigwait.3

sigwait - wait for a signal

  #include <signal.h>

  int sigwait(const sigset_t *restrict set, int *restrict sig);

Feature Test Macro Requirements for glibc (see *feature_test_macros*(7)):

*sigwait*():

      Since glibc 2.26:
          _POSIX_C_SOURCE >= 199506L
      Glibc 2.25 and earlier:
          _POSIX_C_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*() returns only 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.

For an explanation of the terms used in this section, see *attributes*(7).

POSIX.1-2001, POSIX.1-2008.

*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.

See *pthread_sigmask*(3).

*sigaction*(2), *signalfd*(2), *sigpending*(2), *sigsuspend*(2), *sigwaitinfo*(2), *sigsetops*(3), *signal*(7)

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