1 files changed, 42 insertions, 0 deletions
diff --git a/libc/signal/sighold.c b/libc/signal/sighold.c
new file mode 100644
index 000000000..f2978a368
--- /dev/null
+++ b/libc/signal/sighold.c
@@ -0,0 +1,42 @@
+/* Add SIG to the calling process' signal mask.
+   Copyright (C) 1998, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#define __need_NULL
+#include <stddef.h>
+#define __USE_GNU
+#include <signal.h>
+
+int
+sighold (sig)
+     int sig;
+{
+  sigset_t set;
+
+  /* Retrieve current signal set.  */
+  if (sigprocmask (SIG_SETMASK, NULL, &set) < 0)
+    return -1;
+
+  /* Add the specified signal.  */
+  if (__sigaddset (&set, sig) < 0)
+    return -1;
+
+  /* Set the new mask.  */
+  return sigprocmask (SIG_SETMASK, &set, NULL);
+}