1 files changed, 91 insertions, 0 deletions
diff --git a/libc/sysdeps/unix/sysv/linux/sigprocmask.c b/libc/sysdeps/unix/sysv/linux/sigprocmask.c
new file mode 100644
index 000000000..1b13ea74d
--- /dev/null
+++ b/libc/sysdeps/unix/sysv/linux/sigprocmask.c
@@ -0,0 +1,91 @@
+/* Copyright (C) 1997-2001,2003,2004,2006 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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.  */
+
+#include <errno.h>
+#include <signal.h>
+#include <string.h>	/* Neede for string function builtin redirection.  */
+#include <unistd.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+#include <bp-checks.h>
+
+#include <kernel-features.h>
+
+
+/* The variable is shared between all wrappers around signal handling
+   functions which have RT equivalents.  The definition is in sigaction.c.  */
+extern int __libc_missing_rt_sigs;
+
+
+/* Get and/or change the set of blocked signals.  */
+int
+__sigprocmask (how, set, oset)
+     int how;
+     const sigset_t *set;
+     sigset_t *oset;
+{
+#ifdef SIGCANCEL
+  sigset_t local_newmask;
+
+  /* The only thing we have to make sure here is that SIGCANCEL and
+     SIGSETXID are not blocked.  */
+  if (set != NULL
+      && (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
+# ifdef SIGSETXID
+	  || __builtin_expect (__sigismember (set, SIGSETXID), 0)
+# endif
+	  ))
+    {
+      local_newmask = *set;
+      __sigdelset (&local_newmask, SIGCANCEL);
+# ifdef SIGSETXID
+      __sigdelset (&local_newmask, SIGSETXID);
+# endif
+      set = &local_newmask;
+    }
+#endif
+
+#if __ASSUME_REALTIME_SIGNALS > 0
+  return INLINE_SYSCALL (rt_sigprocmask, 4, how, CHECK_SIGSET_NULL_OK (set),
+			 CHECK_SIGSET_NULL_OK (oset), _NSIG / 8);
+#else
+# ifdef __NR_rt_sigprocmask
+  /* First try the RT signals.  */
+  if (!__libc_missing_rt_sigs)
+    {
+      /* XXX The size argument hopefully will have to be changed to the
+	 real size of the user-level sigset_t.  */
+      int saved_errno = errno;
+      int result = INLINE_SYSCALL (rt_sigprocmask, 4, how,
+				   CHECK_SIGSET_NULL_OK (set),
+				   CHECK_SIGSET_NULL_OK (oset), _NSIG / 8);
+
+      if (result >= 0 || errno != ENOSYS)
+	return result;
+
+      __set_errno (saved_errno);
+      __libc_missing_rt_sigs = 1;
+    }
+# endif
+
+  return INLINE_SYSCALL (sigprocmask, 3, how, CHECK_SIGSET_NULL_OK (set),
+			 CHECK_SIGSET_NULL_OK (oset));
+#endif
+}
+weak_alias (__sigprocmask, sigprocmask)