Patch by Vasilis Kaoutsis: Implemented sighold().

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22846 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/signal.h

@@ -164,6 +164,7 @@ int 	sigaddset(sigset_t *set, int signo);
 int 	sigdelset(sigset_t *set, int signo);
 int 	sigismember(const sigset_t *set, int signo);
 int		sigignore(int signo);
+int		sighold(int signo);
 
 const char *strsignal(int sig);
 

src/system/libroot/posix/signal/Jamfile

@@ -10,6 +10,7 @@ MergeObject posix_signal.o :
 	set_signal_stack.c
 	sigaction.c
 	sigaltstack.c
+	sighold.cpp
 	sigignore.cpp
 	signal.c
 	sigpending.c

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

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2007, Vasilis Kaoutsis, [email protected]
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <signal.h>
+
+
+int
+sighold(int signal)
+{
+	// make an empty set
+	// and add the signal
+	sigset_t tempSignalSet;
+	sigemptyset(&tempSignalSet);
+	if (sigaddset(&tempSignalSet, signal) == -1)
+		return -1;
+	
+	// add the signal to the calling process' signal mask
+	return sigprocmask(SIG_BLOCK, &tempSignalSet, NULL);
+}