Patch by Vasilis Kaoutsis: Implemented killpg().

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22697 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/signal.h

@@ -150,6 +150,7 @@ sighandler_t signal(int sig, sighandler_t signalHandler);
 int     raise(int sig);
 int     kill(pid_t pid, int sig);
 int     send_signal(pid_t tid, unsigned int sig);
+int		killpg(pid_t processGroupID, int sig);
 
 int     sigaction(int sig, const struct sigaction *act, struct sigaction *oact);
 int     sigprocmask(int how, const sigset_t *set, sigset_t *oset);

src/system/libroot/posix/signal/Jamfile

@@ -4,6 +4,7 @@ UseHeaders $(TARGET_PRIVATE_KERNEL_HEADERS) : true ;
 
 MergeObject posix_signal.o :
 	kill.c
+	killpg.cpp
 	raise.c
 	send_signal.c
 	set_signal_stack.c

src/system/libroot/posix/signal/killpg.cpp

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2007, Vasilis Kaoutsis, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <errno.h>
+#include <signal.h>
+
+
+int
+killpg(pid_t processGroupID, int signal)
+{
+	if (processGroupID > 1)
+		return kill(-processGroupID, signal);
+	else {
+		errno = EINVAL;
+		return -1;
+	}
+}