sigwait(2) [osx man page]

SIGWAIT(2)						      BSD System Calls Manual							SIGWAIT(2)

NAME

     sigwait -- select a set of signals

SYNOPSIS

     #include <signal.h>

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

DESCRIPTION

     The sigwait() function selects a set of signals, specified by set.  If none of the selected signals are pending, sigwait() waits until one or
     more of the selected signals has been generated.  Then sigwait() atomically clears one of the selected signals from the set of pending sig-
     nals for the process and sets the location pointed to by sig to the signal number that was cleared.

     The signals specified by set should be blocked, but not ignored, at the time of the call to sigwait().

     Processes which call sigwait() on ignored signals will wait indefinitely.	Ignored signals are dropped immediately by the system, before
     delivery to a waiting process.

RETURN VALUES

     If successful, sigwait() returns 0 and sets the location pointed to by sig to the cleared signal number.  Otherwise, an error number is
     returned.

ERRORS

     sigwait() will fail if:

     [EINVAL]		set specifies one or more invalid signal numbers.

SEE ALSO

     pthread_sigmask(2), sigaction(2), sigpending(2), sigsuspend(2), pause(3)

STANDARDS

     sigwait() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'')

BSD
								  April 27, 2000							       BSD

SIGWAIT(3)						     Linux Programmer's Manual							SIGWAIT(3)

NAME

       sigwait - wait for a signal

SYNOPSIS

       #include <signal.h>

	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

DESCRIPTION

       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.

RETURN VALUE

       On success, sigwait() returns 0.  On error, it returns a positive error number (listed in ERRORS).

ERRORS

       EINVAL set contains an invalid signal number.

ATTRIBUTES

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

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |sigwait() | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO

       POSIX.1-2001.

NOTES

       sigwait() is implemented using sigtimedwait(2).

EXAMPLE

       See pthread_sigmask(3).

SEE ALSO

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

Linux								    2015-03-02								SIGWAIT(3)