05-10-2011
Read about the POSIX signal interface.
posix signal - Google Search
In general, sending the same signal repeatedly to a server process is not a great idea. You should use IPC (pipes, sockets, message queues, lockfiles, etc.) instead.
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LEARN ABOUT MOJAVE
killpg
KILLPG(2) BSD System Calls Manual KILLPG(2)
NAME
killpg -- send signal to a process group
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h>
int
killpg(pid_t pgrp, int sig);
DESCRIPTION
The killpg() function sends the signal sig to the process group pgrp. See sigaction(2) for a list of signals. If pgrp is 0, killpg() sends
the signal to the sending process's process group.
The sending process and members of the process group must have the same effective user ID, or the sender must be the super-user. As a single
special case the continue signal SIGCONT may be sent to any process with the same session ID as the caller.
RETURN VALUES
The killpg() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
The killpg() function will fail and no signal will be sent if:
[EINVAL] The sig argument is not a valid signal number.
[EPERM] The sending process is not the super-user and one or more of the target processes has an effective user ID different from
that of the sending process.
[ESRCH] No process can be found in the process group specified by pgrp.
[ESRCH] The process group was given as 0 but the sending process does not have a process group.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <signal.h>
The include file <sys/types.h> is necessary.
SEE ALSO
getpgrp(2), kill(2), sigaction(2), compat(5)
HISTORY
The killpg() function appeared in 4.0BSD.
BSD
October 10, 2006 BSD