Patch by Vasilis Kaoutsis: Implemented sigrelse().

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22865 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/signal.h

@@ -165,6 +165,7 @@ int 	sigdelset(sigset_t *set, int signo);
 int 	sigismember(const sigset_t *set, int signo);
 int		sigignore(int signo);
 int		sighold(int signo);
+int		sigrelse(int signo);
 
 const char *strsignal(int sig);
 

src/system/libroot/posix/signal/Jamfile

@@ -15,6 +15,7 @@ MergeObject posix_signal.o :
 	signal.c
 	sigpending.c
 	sigprocmask.c
+	sigrelse.cpp
 	sigset.c
 	sigsuspend.c
 	strsignal.c

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

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2007, Vasilis Kaoutsis, kaoutsis@sch.gr
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <signal.h>
+
+
+int
+sigrelse(int signal)
+{
+	// make an empty set
+	// and add the signal
+	sigset_t tempSignalSet;
+	sigemptyset(&tempSignalSet);
+	if (sigaddset(&tempSignalSet, signal) == -1)
+		return -1;
+	
+	// remove the signal from the calling process' signal mask
+	return sigprocmask(SIG_UNBLOCK, &tempSignalSet, NULL);
+}