uclibc: convert accept4 to use cancel.h macros

Fixes:
 http://autobuild.buildroot.net/results/78e033fe9f43845581a5d87b21a8451f67520e44

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Tested-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/uclibc/0003-convert-accept4-to-use-cancel.h-macros.patch

@@ -0,0 +1,102 @@
+From c7e82668bd23fbdd02ebe1e83ff2bb6877812423 Mon Sep 17 00:00:00 2001
+From: Waldemar Brodkorb <wbx@uclibc-ng.org>
+Date: Thu, 2 Nov 2017 02:40:43 +0100
+Subject: [PATCH] convert accept4() to use cancel.h macros
+
+Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
+---
+ include/sys/socket.h                  |  1 +
+ libc/inet/socketcalls.c               | 37 +++++++++--------------------------
+ libpthread/linuxthreads/wrapsyscall.c |  7 +++++++
+ 3 files changed, 17 insertions(+), 28 deletions(-)
+
+diff --git a/include/sys/socket.h b/include/sys/socket.h
+index 63dc4b953..83e1fcaa2 100644
+--- a/include/sys/socket.h
++++ b/include/sys/socket.h
+@@ -269,6 +269,7 @@ libc_hidden_proto(accept)
+    __THROW.  */
+ extern int accept4 (int __fd, __SOCKADDR_ARG __addr,
+ 		    socklen_t *__restrict __addr_len, int __flags);
++libc_hidden_proto(accept4)
+ #endif
+ 
+ /* Shut down all or part of the connection open on socket FD.
+diff --git a/libc/inet/socketcalls.c b/libc/inet/socketcalls.c
+index e33d69344..1b92609d0 100644
+--- a/libc/inet/socketcalls.c
++++ b/libc/inet/socketcalls.c
+@@ -76,43 +76,24 @@ lt_libc_hidden(accept)
+ #endif
+ 
+ #ifdef L_accept4
+-#ifdef __NR_accept4
+-# define __NR___sys_accept4  __NR_accept4
+-static _syscall4(int, __sys_accept4, int, fd, struct sockaddr *, addr, socklen_t *, addrlen, int, flags)
+-int accept4(int fd, struct sockaddr *addr, socklen_t * addrlen, int flags)
+-{
+-	if (SINGLE_THREAD_P)
+-		return __sys_accept4(fd, addr, addrlen, flags);
+-#ifdef __UCLIBC_HAS_THREADS_NATIVE__
+-	else {
+-		int oldtype = LIBC_CANCEL_ASYNC ();
+-		int result = __sys_accept4(fd, addr, addrlen, flags);
+-		LIBC_CANCEL_RESET (oldtype);
+-		return result;
+-	}
+-#endif
+-}
+-#elif defined(__NR_socketcall)
+-int accept4(int fd, struct sockaddr *addr, socklen_t *addrlen, int flags)
++static int __NC(accept4)(int fd, struct sockaddr *addr, socklen_t *addrlen, int flags)
+ {
++# ifdef __NR_accept4
++	return INLINE_SYSCALL(accept4, 4, fd, addr, addrlen, flags);
++# elif defined(__NR_socketcall)
+ 	unsigned long args[4];
+ 
+ 	args[0] = fd;
+ 	args[1] = (unsigned long) addr;
+ 	args[2] = (unsigned long) addrlen;
+ 	args[3] = flags;
+-	if (SINGLE_THREAD_P)
+-		return __socketcall(SYS_ACCEPT4, args);
+-#ifdef __UCLIBC_HAS_THREADS_NATIVE__
+-	else {
+-		int oldtype = LIBC_CANCEL_ASYNC ();
+-		int result = __socketcall(SYS_ACCEPT4, args);
+-		LIBC_CANCEL_RESET (oldtype);
+-		return result;
+-	}
++
++	return __socketcall(SYS_ACCEPT4, args);
+ #endif
+ }
+-#endif
++CANCELLABLE_SYSCALL(int, accept4, (int fd, struct sockaddr *addr, socklen_t *addrlen, int flags),
++		    (fd, addr, addrlen, flags))
++lt_libc_hidden(accept4)
+ #endif
+ 
+ #ifdef L_bind
+diff --git a/libpthread/linuxthreads/wrapsyscall.c b/libpthread/linuxthreads/wrapsyscall.c
+index ca046a442..2386bfdef 100644
+--- a/libpthread/linuxthreads/wrapsyscall.c
++++ b/libpthread/linuxthreads/wrapsyscall.c
+@@ -192,6 +192,13 @@ CANCELABLE_SYSCALL (int, accept, (int fd, __SOCKADDR_ARG addr,
+ 				  socklen_t *addr_len),
+ 		    (fd, addr, addr_len))
+ 
++#if defined __UCLIBC_LINUX_SPECIFIC__
++/* accept4(2).  */
++CANCELABLE_SYSCALL (int, accept4, (int fd, __SOCKADDR_ARG addr,
++				  socklen_t *addr_len, int flags),
++		    (fd, addr, addr_len, flags))
++#endif
++
+ /* connect(2).  */
+ CANCELABLE_SYSCALL (int, connect, (int fd, __CONST_SOCKADDR_ARG addr,
+ 				     socklen_t len),
+-- 
+2.11.0
+