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NetBSD 6.1.5 - man page for sigqueueinfo (netbsd section 2)

SIGQUEUE(2)			     BSD System Calls Manual			      SIGQUEUE(2)

NAME
     sigqueue -- queue a signal to a process (REALTIME)

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <signal.h>

     int
     sigqueue(pid_t pid, int signo, const union sigval value);

     int
     sigqueueinfo(pid_t pid, const siginfo_t *info);

DESCRIPTION
     The sigqueue() system call causes the signal specified by signo to be sent with the value
     specified by value to the process specified by pid.  If 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.

     The conditions required for a process to have permission to queue a signal to another
     process are the same as for the kill(2) system call.  The sigqueue() system call queues a
     signal to a single process specified by the pid argument.

     The sigqueue() system call is implemented using sigqueueinfo() and passing the appropriate
     information in the info argument.

     The 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.

     If the value of pid causes signo to be generated for the sending process, and if signo is
     not blocked for the calling thread and if no other thread has signo unblocked or is waiting
     in a sigwait() system call for signo, either signo or at least the pending, unblocked signal
     will be delivered to the calling thread before sigqueue() returns.  Should any multiple
     pending signals in the range SIGRTMIN to 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.

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and
     the global variable errno is set to indicate the error.

ERRORS
     The sigqueue() system call will fail if:

     [EAGAIN]		No resources are available to queue the signal.  The process has already
			queued {SIGQUEUE_MAX} signals that are still pending at the receiver(s),
			or a system-wide resource limit has been exceeded.

     [EEPERM]		The process does not have the appropriate privilege to send the signal to
			the receiving process.

     [EINVAL]		The value of the signo argument is an invalid or unsupported signal num-
			ber.

     [ESRCH]		The process pid does not exist.

SEE ALSO
     sigaction(2), siginfo(2), sigpending(2), sigsuspend(2), sigtimedwait(2), sigwait(2),
     sigwaitinfo(2), pause(3), pthread_sigmask(3)

STANDARDS
     The sigqueue() system call conforms to IEEE Std 1003.1-2004 (``POSIX.1'').

HISTORY
     Support for POSIX realtime signal queue first appeared in NetBSD 6.0.

BSD					 January 9, 2011				      BSD


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