1 files changed, 80 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/sysv4/sigaction.c b/ports/sysdeps/unix/sysv/sysv4/sigaction.c
new file mode 100644
index 000000000..d5926b3d4
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/sysv4/sigaction.c
@@ -0,0 +1,80 @@
+/* Copyright (C) 1994,1995,1996,1997,2002 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 <stddef.h>
+
+static __sighandler_t user_handlers[NSIG];
+
+extern int __context_syscall (int, struct sigcontext *);
+extern int __sigaction_syscall (int,
+				const struct sigaction *, struct sigaction *);
+
+static void
+trampoline (int sig, int code, struct sigcontext *context)
+{
+  (*(void (*) (int, int, struct sigcontext *)) user_handlers[sig])
+    (sig, code, context);
+  __context_syscall (1, context);
+}
+
+/* If ACT is not NULL, change the action for SIG to *ACT.
+   If OACT is not NULL, put the old action for SIG in *OACT.  */
+int
+__sigaction (sig, act, oact)
+     int sig;
+     const struct sigaction *act;
+     struct sigaction *oact;
+{
+  struct sigaction myact;
+  __sighandler_t ohandler;
+
+  if (sig <= 0 || sig >= NSIG)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  ohandler = user_handlers[sig];
+
+  if (act != NULL)
+    {
+      user_handlers[sig] = act->sa_handler;
+      if (act->sa_handler != SIG_DFL && act->sa_handler != SIG_IGN)
+	{
+	  myact = *act;
+	  act = &myact;
+	  act->sa_handler = (__sighandler_t) trampoline;
+	}
+    }
+
+  if (__sigaction_syscall (sig, act, oact) < 0)
+    {
+      /* The syscall got an error.  Restore the old handler and return -1.  */
+      user_handlers[sig] = ohandler;
+      return -1;
+    }
+
+  if (oact != NULL && oact->sa_handler == (__sighandler_t) trampoline)
+    oact->sa_handler = ohandler;
+
+  return 0;
+}
+libc_hidden_def (__sigaction)
+weak_alias (__sigaction, sigaction)