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-.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>.
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-.\"
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-.\" modification, are permitted provided that the following conditions
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-.\"    the first lines of this file unmodified other than the possible
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-.\" 2. Redistributions in binary form must reproduce the above copyright
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-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
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-.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-.\"
-.Dd September 6, 2013
-.Dt SIGWAIT 2
-.Os
-.Sh NAME
-.Nm sigwait
-.Nd select a set of signals
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In signal.h
-.Ft int
-.Fn sigwait "const sigset_t * restrict set" "int * restrict sig"
-.Sh DESCRIPTION
-The
-.Fn sigwait
-system call selects a set of signals, specified by
-.Fa set .
-If none of the selected signals are pending,
-.Fn sigwait
-waits until one or more of the selected signals has been generated.
-Then
-.Fn sigwait
-atomically clears one of the selected signals from the set of pending signals
-(for the process or for the current thread) and sets the location pointed to by
-.Fa sig
-to the signal number that was cleared.
-.Pp
-The signals specified by
-.Fa set
-should be blocked at the time of the call to
-.Fn sigwait .
-.Pp
-If more than one thread is using
-.Fn sigwait
-to wait for the same signal, no more than one of these threads will return from
-.Fn sigwait
-with the signal number.
-If more than a single thread is blocked in
-.Fn sigwait
-for a signal when that signal is generated for the process, it is unspecified
-which of the waiting threads returns from
-.Fn sigwait .
-If the signal is generated for a specific thread, as by
-.Fn pthread_kill ,
-only that thread will return.
-.Pp
-Should any of the multiple pending signals in the range
-.Dv SIGRTMIN
-to
-.Dv SIGRTMAX
-be
-selected, it will be the lowest numbered one.
-The selection order between realtime
-and non-realtime signals, or between multiple pending non-realtime signals,
-is unspecified.
-.Sh IMPLEMENTATION NOTES
-The
-.Fn sigwait
-function is implemented as a wrapper around the
-.Fn __sys_sigwait
-system call, which retries the call on
-.Er EINTR
-error.
-.Sh RETURN VALUES
-If successful,
-.Fn sigwait
-returns 0 and sets the location pointed to by
-.Fa sig
-to the cleared signal number.
-Otherwise, an error number is returned.
-.Sh ERRORS
-The
-.Fn sigwait
-system call will fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa set
-argument
-specifies one or more invalid signal numbers.
-.El
-.Sh SEE ALSO
-.Xr sigaction 2 ,
-.Xr sigpending 2 ,
-.Xr sigqueue 2 ,
-.Xr sigsuspend 2 ,
-.Xr sigtimedwait 2 ,
-.Xr sigwaitinfo 2 ,
-.Xr pause 3 ,
-.Xr pthread_sigmask 3
-.Sh STANDARDS
-The
-.Fn sigwait
-function conforms to
-.St -p1003.1-96 .