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-.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer as
-.\"    the first lines of this file unmodified other than the possible
-.\"    addition of one or more copyright notices.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
-.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
-.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
-.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.Dd May 5, 2017
-.Dt SIGQUEUE 2
-.Os
-.Sh NAME
-.Nm sigqueue
-.Nd "queue a signal to a process (REALTIME)"
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In signal.h
-.Ft int
-.Fn sigqueue "pid_t pid" "int signo" "const union sigval value"
-.Sh DESCRIPTION
-The
-.Fn sigqueue
-system call causes the signal specified by
-.Fa signo
-to be sent with the value specified by
-.Fa value
-to the process specified by
-.Fa pid .
-If
-.Fa signo
-is zero (the null signal), error checking is performed but
-no signal is actually sent.
-The null signal can be used to check the
-validity of PID.
-.Pp
-The conditions required for a process to have permission to queue a
-signal to another process are the same as for the
-.Xr kill 2
-system call.
-The
-.Fn sigqueue
-system call queues a signal to a single process specified by the
-.Fa pid
-argument.
-.Pp
-The
-.Fn sigqueue
-system call returns immediately.
-If the resources were
-available to queue the signal, the signal will be queued and sent to
-the receiving process.
-.Pp
-If the value of
-.Fa pid
-causes
-.Fa signo
-to be generated for the sending process, and if
-.Fa signo
-is not blocked for the calling thread and if no other thread has
-.Fa signo
-unblocked or is waiting in a
-.Fn sigwait
-system call for
-.Fa signo ,
-either
-.Fa signo
-or at least the pending, unblocked signal will be delivered to the
-calling thread before
-.Fn sigqueue
-returns.
-Should any multiple pending signals in the range
-.Dv SIGRTMIN
-to
-.Dv SIGRTMAX
-be selected for delivery, it is the lowest numbered
-one.
-The selection order between realtime and non-realtime signals, or
-between multiple pending non-realtime signals, is unspecified.
-.Sh RETURN VALUES
-.Rv -std
-.Sh ERRORS
-The
-.Fn sigqueue
-system call
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EAGAIN
-No resources are available to queue the signal.
-The process has already
-queued
-.Brq Dv SIGQUEUE_MAX
-signals that are still pending at the receiver(s),
-or a system-wide resource limit has been exceeded.
-.It Bq Er EINVAL
-The value of the
-.Fa signo
-argument is an invalid or unsupported signal number.
-.It Bq Er EPERM
-The process does not have the appropriate privilege to send the signal
-to the receiving process.
-.It Bq Er ESRCH
-The process
-.Fa pid
-does not exist.
-.El
-.Sh SEE ALSO
-.Xr kill 2 ,
-.Xr sigaction 2 ,
-.Xr sigpending 2 ,
-.Xr sigsuspend 2 ,
-.Xr sigtimedwait 2 ,
-.Xr sigwait 2 ,
-.Xr sigwaitinfo 2 ,
-.Xr pause 3 ,
-.Xr pthread_sigmask 3 ,
-.Xr siginfo 3
-.Sh STANDARDS
-The
-.Fn sigqueue
-system call conforms to
-.St -p1003.1-2004 .
-.Sh HISTORY
-Support for
-.Tn POSIX
-realtime signal queue first appeared in
-.Fx 7.0 .
-.Sh CAVEATS
-When using
-.Nm
-to send signals to a process which might have a different ABI
-(for instance, one is 32-bit and the other 64-bit),
-the
-.Va sival_int
-member of
-.Fa value
-can be delivered reliably, but the
-.Va sival_ptr
-may be truncated in endian dependent ways and must not be relied on.
-Further, many pointer integrity schemes disallow sending pointers to other
-processes, and this technique should not be used in programs intended to
-be portable.