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-.\" Copyright (c) 2002 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sigwaitinfo 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-sigwaitinfo, sigtimedwait, rt_sigtimedwait \- synchronously wait
-for queued signals
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.P
-.BI "int sigwaitinfo(const sigset_t *restrict " set ,
-.BI "                siginfo_t *_Nullable restrict " info );
-.BI "int sigtimedwait(const sigset_t *restrict " set ,
-.BI "                siginfo_t *_Nullable restrict " info ,
-.BI "                const struct timespec *restrict " timeout );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR sigwaitinfo (),
-.BR sigtimedwait ():
-.nf
-    _POSIX_C_SOURCE >= 199309L
-.fi
-.SH DESCRIPTION
-.BR sigwaitinfo ()
-suspends execution of the calling thread until one of the signals in
-.I set
-is pending
-(If one of the signals in
-.I set
-is already pending for the calling thread,
-.BR sigwaitinfo ()
-will return immediately.)
-.P
-.BR sigwaitinfo ()
-removes the signal from the set of pending
-signals and returns the signal number as its function result.
-If the
-.I info
-argument is not NULL,
-then the buffer that it points to is used to return a structure of type
-.I siginfo_t
-(see
-.BR sigaction (2))
-containing information about the signal.
-.P
-If multiple signals in
-.I set
-are pending for the caller, the signal that is retrieved by
-.BR sigwaitinfo ()
-is determined according to the usual ordering rules; see
-.BR signal (7)
-for further details.
-.P
-.BR sigtimedwait ()
-operates in exactly the same way as
-.BR sigwaitinfo ()
-except that it has an additional argument,
-.IR timeout ,
-which specifies the interval for which
-the thread is suspended waiting for a signal.
-(This interval will be rounded up to the system clock granularity,
-and kernel scheduling delays mean that the interval
-may overrun by a small amount.)
-This argument is a
-.BR timespec (3)
-structure.
-.P
-If both fields of this structure are specified as 0, a poll is performed:
-.BR sigtimedwait ()
-returns immediately, either with information about a signal that
-was pending for the caller, or with an error
-if none of the signals in
-.I set
-was pending.
-.SH RETURN VALUE
-On success, both
-.BR sigwaitinfo ()
-and
-.BR sigtimedwait ()
-return a signal number (i.e., a value greater than zero).
-On failure both calls return \-1, with
-.I errno
-set to indicate the error.
-.SH ERRORS
-.TP
-.B EAGAIN
-No signal in
-.I set
-became pending within the
-.I timeout
-period specified to
-.BR sigtimedwait ().
-.TP
-.B EINTR
-The wait was interrupted by a signal handler; see
-.BR signal (7).
-(This handler was for a signal other than one of those in
-.IR set .)
-.TP
-.B EINVAL
-.I timeout
-was invalid.
-.SH VERSIONS
-.SS C library/kernel differences
-On Linux,
-.BR sigwaitinfo ()
-is a library function implemented on top of
-.BR sigtimedwait ().
-.P
-The glibc wrapper functions for
-.BR sigwaitinfo ()
-and
-.BR sigtimedwait ()
-silently ignore attempts to wait for the two real-time signals that
-are used internally by the NPTL threading implementation.
-See
-.BR nptl (7)
-for details.
-.P
-The original Linux system call was named
-.BR sigtimedwait ().
-However, with the addition of real-time signals in Linux 2.2,
-the fixed-size, 32-bit
-.I sigset_t
-type supported by that system call was no longer fit for purpose.
-Consequently, a new system call,
-.BR rt_sigtimedwait (),
-was added to support an enlarged
-.I sigset_t
-type.
-The new system call takes a fourth argument,
-.IR "size_t sigsetsize" ,
-which specifies the size in bytes of the signal set in
-.IR set .
-This argument is currently required to have the value
-.I sizeof(sigset_t)
-(or the error
-.B EINVAL
-results).
-The glibc
-.BR sigtimedwait ()
-wrapper function hides these details from us, transparently calling
-.BR rt_sigtimedwait ()
-when the kernel provides it.
-.\"
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH NOTES
-In normal usage, the calling program blocks the signals in
-.I set
-via a prior call to
-.BR sigprocmask (2)
-(so that the default disposition for these signals does not occur if they
-become pending between successive calls to
-.BR sigwaitinfo ()
-or
-.BR sigtimedwait ())
-and does not establish handlers for these signals.
-In a multithreaded program,
-the signal should be blocked in all threads, in order to prevent
-the signal being treated according to its default disposition in
-a thread other than the one calling
-.BR sigwaitinfo ()
-or
-.BR sigtimedwait ()).
-.P
-The set of signals that is pending for a given thread is the
-union of the set of signals that is pending specifically for that thread
-and the set of signals that is pending for the process as a whole (see
-.BR signal (7)).
-.P
-Attempts to wait for
-.B SIGKILL
-and
-.B SIGSTOP
-are silently ignored.
-.P
-If multiple threads of a process are blocked
-waiting for the same signal(s) in
-.BR sigwaitinfo ()
-or
-.BR sigtimedwait (),
-then exactly one of the threads will actually receive the
-signal if it becomes pending for the process as a whole;
-which of the threads receives the signal is indeterminate.
-.P
-.BR sigwaitinfo ()
-or
-.BR sigtimedwait (),
-can't be used to receive signals that
-are synchronously generated, such as the
-.B SIGSEGV
-signal that results from accessing an invalid memory address
-or the
-.B SIGFPE
-signal that results from an arithmetic error.
-Such signals can be caught only via signal handler.
-.P
-POSIX leaves the meaning of a NULL value for the
-.I timeout
-argument of
-.BR sigtimedwait ()
-unspecified, permitting the possibility that this has the same meaning
-as a call to
-.BR sigwaitinfo (),
-and indeed this is what is done on Linux.
-.SH SEE ALSO
-.BR kill (2),
-.BR sigaction (2),
-.BR signal (2),
-.BR signalfd (2),
-.BR sigpending (2),
-.BR sigprocmask (2),
-.BR sigqueue (3),
-.BR sigsetops (3),
-.BR sigwait (3),
-.BR timespec (3),
-.BR signal (7),
-.BR time (7)