Libc-262.tar.gz

[apple/libc.git] / sys / sigaction.c

diff --git a/sys/sigaction.c b/sys/sigaction.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
+ *
+ *     @(#)sigaction.c 1.0
+ */
+
+#include <sys/syscall.h>
+#include <signal.h>
+#include <sys/signal.h>
+#include <errno.h>
+
+/*
+ *     Intercept the sigaction syscall and use our signal trampoline
+ *     as the signal handler instead.  The code here is derived
+ *     from sigvec in sys/kern_sig.c.
+ */
+
+#if defined(__DYNAMIC__)
+extern int __in_sigtramp;
+#endif
+
+static int
+sigaction__ (sig, nsv, osv, bind)
+        int sig;
+       register struct sigaction *nsv, *osv;
+        int bind;
+{
+       struct sigaction vec;
+       void (*prevsig)();
+       extern void _sigtramp();
+       struct __sigaction sa;
+       struct __sigaction *sap;
+
+       if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) {
+               errno = EINVAL;
+               return (-1);
+       }
+       sap = (struct __sigaction *)0;
+       if (nsv) {
+               sa.sa_handler = nsv->sa_handler;
+               sa.sa_tramp = _sigtramp;
+               sa.sa_mask = nsv->sa_mask;
+               sa.sa_flags = nsv->sa_flags;    
+               sap = &sa;
+               if (nsv->sa_handler != (void (*)())SIG_DFL && nsv->sa_handler != (void (*)())SIG_IGN) {
+#ifdef __DYNAMIC__
+                    if (bind && (__in_sigtramp == 0))                          // XXX
+                 _dyld_bind_fully_image_containing_address(nsv->sa_handler);
+#endif
+               }
+       }
+       if (syscall (SYS_sigaction, sig, sap, osv) < 0) {
+               return (-1);
+       }
+       return (0);
+}
+
+
+int
+sigaction (sig, nsv, osv)
+        int sig;
+       register const struct sigaction *nsv;
+        register struct sigaction *osv;
+{
+    return sigaction__(sig, nsv, osv, 1);
+}
+
+// XXX
+#ifdef __DYNAMIC__
+
+int
+_sigaction_nobind (sig, nsv, osv)
+        int sig;
+       register const struct sigaction *nsv;
+        register struct sigaction *osv;
+{
+    return sigaction__(sig, nsv, osv, 0);
+}
+#endif
+