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RedHat 9 (Linux i386) - man page for sigqueue (redhat section 2)

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SIGQUEUE(2)			    Linux Programmer's Manual			      SIGQUEUE(2)

       sigqueue - queue a signal and data to a process

       #include <signal.h>

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

       sigqueue()  sends  the  signal  specified in sig to the process whose PID is given in pid.
       The permissions required to send a signal are the same as for kill(2).  As  with  kill(2),
       the null signal (0) can be used to check if a process with a given PID exists.

       The value argument is used to specify an accompanying item of data (either an integer or a
       pointer value) to be sent with the signal, and has the following type:

	 union sigval {
	     int   sival_int;
	     void *sival_ptr;

       If the receiving process has installed a handler for this signal using the SA_SIGINFO flag
       to  sigaction(2),  then	it  can  obtain this data via the si_value field of the siginfo_t
       structure passed as the second argument to the handler.	Furthermore, the si_code field of
       that structure will be set to SI_QUEUE.

       On  success,  sigqueue()  returns 0, indicating that the signal was successfully queued to
       the receiving proces.  Otherwise -1 is returned and errno is set to indicate the error.

       EAGAIN The limit of signals which may be queued has been reached.  (See signal(7) for fur-
	      ther information.)

       EINVAL sig was invalid.

       ESRCH  No process has a PID matching pid.

       EPERM  The  process  does not have permission to send the signal to the receiving process.
	      (See kill(2) for further information.)

       If this function results in the sending of a signal to the process that	invoked  it,  and
       that  signal  was  not blocked by the calling thread, and no other threads were willing to
       handle this signal (either by having it unblocked, or by waiting for it using sigwait(3)),
       then at least some signal must be delivered to this thread before this function returns.

       POSIX 1003.1-2001

       kill(2), sigaction(2), signal(2), sigwait(3), signal(7)

Linux 2.4.18				    2002-06-07				      SIGQUEUE(2)
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