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Diffstat (limited to 'sysdeps/unix/sysv/sigaction.c')
-rw-r--r--sysdeps/unix/sysv/sigaction.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/sigaction.c b/sysdeps/unix/sysv/sigaction.c
new file mode 100644
index 0000000000..ebb42cf756
--- /dev/null
+++ b/sysdeps/unix/sysv/sigaction.c
@@ -0,0 +1,83 @@
+/* Copyright (C) 1992, 1994, 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <sysdep.h>
+#include <errno.h>
+#include <stddef.h>
+#include <signal.h>
+
+
+/* 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
+DEFUN(__sigaction, (sig, act, oact),
+ int sig AND CONST struct sigaction *act AND struct sigaction *oact)
+{
+ sighandler_t handler;
+ int save;
+
+ if (sig <= 0 || sig >= NSIG)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (act == NULL)
+ {
+ if (oact == NULL)
+ return 0;
+ /* Race condition, but this is the only way to do it. */
+ handler = signal (sig, SIG_IGN);
+ if (handler == SIG_ERR)
+ return -1;
+ save = errno;
+ (void) signal (sig, handler);
+ errno = save;
+ }
+ else
+ {
+ int i;
+
+ if (act->sa_flags != 0)
+ {
+ unimplemented:
+ errno = ENOSYS;
+ return -1;
+ }
+
+ for (i = 1; i < NSIG; ++i)
+ if (__sigismember (&act->sa_mask, i))
+ goto unimplemented;
+
+ handler = signal (sig, act->sa_handler);
+ if (handler == SIG_ERR)
+ return -1;
+ }
+
+ if (oact != NULL)
+ {
+ oact->sa_handler = handler;
+ __sigemptyset (&oact->sa_mask);
+ oact->sa_flags = 0;
+ }
+
+ return 0;
+}
+
+weak_alias (__sigaction, sigaction)