Libc-262.tar.gz

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

diff --git a/sys/sigtramp.c b/sys/sigtramp.c
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+++ b/sys/sigtramp.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
+ */
+#import        "sigcatch.h"
+#import        <signal.h>
+#import        <sys/signal.h>
+#import        <ucontext.h>
+
+/*
+ * sigvec registers _sigtramp as the handler for any signal requiring
+ * user-mode intervention.  All _sigtramp does is find the real handler,
+ * calls it, then sigreturn's.
+ *
+ * Note that the kernel saves/restores all of our register state.
+ */
+#if defined(__DYNAMIC__)
+int __in_sigtramp = 0;
+#endif
+
+void
+_sigtramp(
+       union __sigaction_u __sigaction_u,
+       int                     sigstyle,
+       int                     sig,
+       siginfo_t               *sinfo,
+       struct ucontext         *uctx
+) {
+
+#if defined(__DYNAMIC__)
+        __in_sigtramp++;
+#endif
+       if (sigstyle == 1)
+               sa_handler(sig);
+#ifdef __ppc__
+       else
+               sa_sigaction(sig, sinfo, uctx);
+#endif /* __ppc__ */
+               
+#if defined(__DYNAMIC__)
+        __in_sigtramp--;
+#endif
+        sigreturn(uctx);
+}