From 57e8823548ad6e65d33b2153edeb18fb0edc20e6 Mon Sep 17 00:00:00 2001
From: Austin Foxley <austinf@cetoncorp.com>
Date: Sat, 17 Oct 2009 14:32:36 -0700
Subject: cancellation support for a large amount of the required syscalls

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
---
 libc/sysdeps/linux/common/__rt_sigtimedwait.c | 100 +++++++++++++++++++-------
 1 file changed, 76 insertions(+), 24 deletions(-)

(limited to 'libc/sysdeps/linux/common/__rt_sigtimedwait.c')

diff --git a/libc/sysdeps/linux/common/__rt_sigtimedwait.c b/libc/sysdeps/linux/common/__rt_sigtimedwait.c
index f9ec0eabf..554c6b9cb 100644
--- a/libc/sysdeps/linux/common/__rt_sigtimedwait.c
+++ b/libc/sysdeps/linux/common/__rt_sigtimedwait.c
@@ -2,44 +2,97 @@
 /*
  * __rt_sigtimedwait() for uClibc
  *
- * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ * Copyright (C) 2006 by Steven Hill <sjhill@realitydiluted.com>
+ * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
  *
- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ * GNU Library General Public License (LGPL) version 2 or later.
  */
 
 #include <sys/syscall.h>
 #include <signal.h>
-#define __need_NULL
-#include <stddef.h>
+#include <string.h>
 
+libc_hidden_proto(memcpy)
 
 #ifdef __NR_rt_sigtimedwait
-#define __NR___rt_sigtimedwait __NR_rt_sigtimedwait
-static _syscall4(int, __rt_sigtimedwait, const sigset_t *, set, siginfo_t *, info,
-		  const struct timespec *, timeout, size_t, setsize)
+#include <string.h>
+libc_hidden_proto(memcpy)
 
-int sigwaitinfo(const sigset_t * set, siginfo_t * info)
+# ifdef __UCLIBC_HAS_THREADS_NATIVE__
+#  include <sysdep-cancel.h>
+
+static int do_sigtimedwait(const sigset_t *set, siginfo_t *info,
+						   const struct timespec *timeout)
 {
-	return __rt_sigtimedwait(set, info, NULL, _NSIG / 8);
+#  ifdef SIGCANCEL
+	sigset_t tmpset;
+
+	if (set != NULL && (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
+#   ifdef SIGSETXID
+		|| __builtin_expect (__sigismember (set, SIGSETXID), 0)
+#   endif
+		))
+	{
+		/* Create a temporary mask without the bit for SIGCANCEL set.  */
+		// We are not copying more than we have to.
+		memcpy (&tmpset, set, _NSIG / 8);
+		__sigdelset (&tmpset, SIGCANCEL);
+#   ifdef SIGSETXID
+		__sigdelset (&tmpset, SIGSETXID);
+#   endif
+		set = &tmpset;
+	}
+#  endif
+
+	/* XXX The size argument hopefully will have to be changed to the
+	   real size of the user-level sigset_t.  */
+	int result = INLINE_SYSCALL (rt_sigtimedwait, 4, set, info,
+								 timeout, _NSIG / 8);
+
+	/* The kernel generates a SI_TKILL code in si_code in case tkill is
+	   used.  tkill is transparently used in raise().  Since having
+	   SI_TKILL as a code is useful in general we fold the results
+	   here.  */
+	if (result != -1 && info != NULL && info->si_code == SI_TKILL)
+		info->si_code = SI_USER;
+
+	return result;
 }
 
-int sigtimedwait(const sigset_t * set, siginfo_t * info,
-				 const struct timespec *timeout)
+/* Return any pending signal or wait for one for the given time.  */
+int __sigtimedwait(const sigset_t *set, siginfo_t *info,
+				   const struct timespec *timeout)
 {
-	return __rt_sigtimedwait(set, info, timeout, _NSIG / 8);
+	if(SINGLE_THREAD_P)
+		return do_sigtimedwait(set, info, timeout);
+
+	int oldtype = LIBC_CANCEL_ASYNC();
+
+	/* XXX The size argument hopefully will have to be changed to the
+	   real size of the user-level sigset_t.  */
+	int result = do_sigtimedwait(set, info, timeout);
+
+	LIBC_CANCEL_RESET(oldtype);
+
+	return result;
 }
-#else
-int sigwaitinfo(const sigset_t * set, siginfo_t * info)
+# else
+#  define __need_NULL
+#  include <stddef.h>
+#  define __NR___rt_sigtimedwait __NR_rt_sigtimedwait
+static _syscall4(int, __rt_sigtimedwait, const sigset_t *, set,
+				 siginfo_t *, info, const struct timespec *, timeout,
+				 size_t, setsize);
+
+int attribute_hidden __sigtimedwait(const sigset_t * set, siginfo_t * info,
+									const struct timespec *timeout)
 {
-	if (set == NULL)
-		__set_errno(EINVAL);
-	else
-		__set_errno(ENOSYS);
-	return -1;
+	return __rt_sigtimedwait(set, info, timeout, _NSIG / 8);
 }
-
-int sigtimedwait(const sigset_t * set, siginfo_t * info,
-				 const struct timespec *timeout)
+# endif /* !__UCLIBC_HAS_THREADS_NATIVE__ */
+#else
+int attribute_hidden __sigtimedwait(const sigset_t * set, siginfo_t * info,
+									const struct timespec *timeout)
 {
 	if (set == NULL)
 		__set_errno(EINVAL);
@@ -48,5 +101,4 @@ int sigtimedwait(const sigset_t * set, siginfo_t * info,
 	return -1;
 }
 #endif
-libc_hidden_def(sigwaitinfo)
-libc_hidden_def(sigtimedwait)
+weak_alias(__sigtimedwait,sigtimedwait)
-- 
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