Assume that accept4 is always available and worksfw/accept4

Simplify the Linux accept4 implementation based on the assumption
that it is available in some way.  __ASSUME_ACCEPT4_SOCKETCALL was
previously unused, so remove it.  Its functionality is implied
by the complex #if condition in accept4.c.

14 files changed, 239 insertions, 161 deletions

diff --git a/ChangeLog b/ChangeLog
index e8e5b98f0e..1085153d1a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,33 @@
+2017-04-14  Florian Weimer  <fweimer@redhat.com>
+
+	* nscd/connections.c (have_accept4): Removed definition.
+	(nscd_run_worker, main_loop_poll, main_loop_epolll): Assume that
+	accept4 works.
+	* manual/install.texi (Linux): Require at least kernel 3.2.18 for
+	ia64 because that was the first version with accept4 support.
+	* support/Makefile (libsupport-routines): Add xaccept4.
+	* support/xsocket.h (xaccept4): Declare.
+	* support/xaccept4.c: New file.
+	* socket/tst-accept4.c: New file.
+	* socket/Makefile (tests): Add tst-accept4.
+	* sysdeps/mach/hurd/kernel-features.h (__ASSUME_ACCEPT4): Remove
+	definition.
+	* sysdeps/nacl/kernel-features.h (__ASSUME_ACCEPT4): Remove
+	comment.
+	* sysdeps/unix/sysv/linux/accept4.c: Assume that an accept4
+	implementation is available.
+	(accept4): Use the system call if available, otherwise use the
+	socket call.
+	* sysdeps/unix/sysv/linux/ia64/kernel-features.h
+	(__ASSUME_ACCEPT4_SYSCALL, __ASSUME_ACCEPT4): Do not undefine.
+	accept4 is unconditionally available in later 3.2 stable kernels.
+	(__ASSUME_ACCEPT4_SYSCALL): Define.
+	* sysdeps/unix/sysv/linux/kernel-features.h
+	(__ASSUME_ACCEPT4_SOCKETCALL, __ASSUME_ACCEPT4): Remove
+	definitions.
+	* sysdeps/unix/sysv/linux/i386/kernel-features.h
+	(__ASSUME_ACCEPT4_SYSCALL): Define for Linux 4.3 or later.
+
 2017-04-13  Florian Weimer  <fweimer@redhat.com>
 
 	* elf/dl-misc.c (_dl_sysdep_read_whole_file): Assume that
diff --git a/INSTALL b/INSTALL
index 60f714e0df..51989b21ae 100644
--- a/INSTALL
+++ b/INSTALL
@@ -500,21 +500,21 @@ Specific advice for GNU/Linux systems
 =====================================
 
 If you are installing the GNU C Library on GNU/Linux systems, you need
-to have the header files from a 3.2 or newer kernel around for
-reference.  These headers must be installed using 'make
-headers_install'; the headers present in the kernel source directory are
-not suitable for direct use by the GNU C Library.  You do not need to
-use that kernel, just have its headers installed where the GNU C Library
-can access them, referred to here as INSTALL-DIRECTORY.  The easiest way
-to do this is to unpack it in a directory such as
-'/usr/src/linux-VERSION'.  In that directory, run 'make headers_install
-INSTALL_HDR_PATH=INSTALL-DIRECTORY'.  Finally, configure the GNU C
-Library with the option '--with-headers=INSTALL-DIRECTORY/include'.  Use
-the most recent kernel you can get your hands on.  (If you are
-cross-compiling the GNU C Library, you need to specify
-'ARCH=ARCHITECTURE' in the 'make headers_install' command, where
-ARCHITECTURE is the architecture name used by the Linux kernel, such as
-'x86' or 'powerpc'.)
+to have the header files from a 3.2 or newer kernel (a 3.2.18 or newer
+kernel for the ia64 architecture) around for reference.  These headers
+must be installed using 'make headers_install'; the headers present in
+the kernel source directory are not suitable for direct use by the GNU C
+Library.  You do not need to use that kernel, just have its headers
+installed where the GNU C Library can access them, referred to here as
+INSTALL-DIRECTORY.  The easiest way to do this is to unpack it in a
+directory such as '/usr/src/linux-VERSION'.  In that directory, run
+'make headers_install INSTALL_HDR_PATH=INSTALL-DIRECTORY'.  Finally,
+configure the GNU C Library with the option
+'--with-headers=INSTALL-DIRECTORY/include'.  Use the most recent kernel
+you can get your hands on.  (If you are cross-compiling the GNU C
+Library, you need to specify 'ARCH=ARCHITECTURE' in the 'make
+headers_install' command, where ARCHITECTURE is the architecture name
+used by the Linux kernel, such as 'x86' or 'powerpc'.)
 
    After installing the GNU C Library, you may need to remove or rename
 directories such as '/usr/include/linux' and '/usr/include/asm', and
diff --git a/manual/install.texi b/manual/install.texi
index 99397c2ee0..43eafa3639 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -564,22 +564,24 @@ patches, although we try to avoid this.
 @appendixsec Specific advice for @gnulinuxsystems{}
 @cindex kernel header files
 
-If you are installing @theglibc{} on @gnulinuxsystems{}, you need to have
-the header files from a 3.2 or newer kernel around for reference.
-These headers must be installed using @samp{make headers_install}; the
-headers present in the kernel source directory are not suitable for
-direct use by @theglibc{}.  You do not need to use that kernel, just have
-its headers installed where @theglibc{} can access them, referred to here as
-@var{install-directory}.  The easiest way to do this is to unpack it
-in a directory such as @file{/usr/src/linux-@var{version}}.  In that
+If you are installing @theglibc{} on @gnulinuxsystems{}, you need to
+have the header files from a 3.2 or newer kernel (a 3.2.18 or newer
+kernel for the ia64 architecture) around for reference.  These headers
+must be installed using @samp{make headers_install}; the headers present
+in the kernel source directory are not suitable for direct use by
+@theglibc{}.  You do not need to use that kernel, just have its headers
+installed where @theglibc{} can access them, referred to here as
+@var{install-directory}.  The easiest way to do this is to unpack it in
+a directory such as @file{/usr/src/linux-@var{version}}.  In that
 directory, run @samp{make headers_install
-INSTALL_HDR_PATH=@var{install-directory}}.  Finally, configure @theglibc{}
-with the option @samp{--with-headers=@var{install-directory}/include}.
-Use the most recent kernel you can get your hands on.  (If you are
-cross-compiling @theglibc{}, you need to specify
-@samp{ARCH=@var{architecture}} in the @samp{make headers_install}
-command, where @var{architecture} is the architecture name used by the
-Linux kernel, such as @samp{x86} or @samp{powerpc}.)
+INSTALL_HDR_PATH=@var{install-directory}}.  Finally, configure
+@theglibc{} with the option
+@samp{--with-headers=@var{install-directory}/include}.  Use the most
+recent kernel you can get your hands on.  (If you are cross-compiling
+@theglibc{}, you need to specify @samp{ARCH=@var{architecture}} in the
+@samp{make headers_install} command, where @var{architecture} is the
+architecture name used by the Linux kernel, such as @samp{x86} or
+@samp{powerpc}.)
 
 After installing @theglibc{}, you may need to remove or rename
 directories such as @file{/usr/include/linux} and
diff --git a/nscd/connections.c b/nscd/connections.c
index a5ca57aea5..cc1ed72077 100644
--- a/nscd/connections.c
+++ b/nscd/connections.c
@@ -257,10 +257,6 @@ int inotify_fd = -1;
 static int nl_status_fd = -1;
 #endif
 
-#ifndef __ASSUME_ACCEPT4
-static int have_accept4;
-#endif
-
 /* Number of times clients had to wait.  */
 unsigned long int client_queued;
 
@@ -1650,16 +1646,6 @@ nscd_run_worker (void *p)
       /* We are done with the list.  */
       pthread_mutex_unlock (&readylist_lock);
 
-#ifndef __ASSUME_ACCEPT4
-      if (have_accept4 < 0)
-	{
-	  /* We do not want to block on a short read or so.  */
-	  int fl = fcntl (fd, F_GETFL);
-	  if (fl == -1 || fcntl (fd, F_SETFL, fl | O_NONBLOCK) == -1)
-	    goto close_and_out;
-	}
-#endif
-
       /* Now read the request.  */
       request_header req;
       if (__builtin_expect (TEMP_FAILURE_RETRY (read (fd, &req, sizeof (req)))
@@ -2099,24 +2085,8 @@ main_loop_poll (void)
 	  if (conns[0].revents != 0)
 	    {
 	      /* We have a new incoming connection.  Accept the connection.  */
-	      int fd;
-
-#ifndef __ASSUME_ACCEPT4
-	      fd = -1;
-	      if (have_accept4 >= 0)
-#endif
-		{
-		  fd = TEMP_FAILURE_RETRY (accept4 (sock, NULL, NULL,
+	      int fd = TEMP_FAILURE_RETRY (accept4 (sock, NULL, NULL,
 						    SOCK_NONBLOCK));
-#ifndef __ASSUME_ACCEPT4
-		  if (have_accept4 == 0)
-		    have_accept4 = fd != -1 || errno != ENOSYS ? 1 : -1;
-#endif
-		}
-#ifndef __ASSUME_ACCEPT4
-	      if (have_accept4 < 0)
-		fd = TEMP_FAILURE_RETRY (accept (sock, NULL, NULL));
-#endif
 
 	      /* Use the descriptor if we have not reached the limit.  */
 	      if (fd >= 0)
@@ -2284,24 +2254,8 @@ main_loop_epoll (int efd)
 	if (revs[cnt].data.fd == sock)
 	  {
 	    /* A new connection.  */
-	    int fd;
-
-# ifndef __ASSUME_ACCEPT4
-	    fd = -1;
-	    if (have_accept4 >= 0)
-# endif
-	      {
-		fd = TEMP_FAILURE_RETRY (accept4 (sock, NULL, NULL,
+	    int fd = TEMP_FAILURE_RETRY (accept4 (sock, NULL, NULL,
 						  SOCK_NONBLOCK));
-# ifndef __ASSUME_ACCEPT4
-		if (have_accept4 == 0)
-		  have_accept4 = fd != -1 || errno != ENOSYS ? 1 : -1;
-# endif
-	      }
-# ifndef __ASSUME_ACCEPT4
-	    if (have_accept4 < 0)
-	      fd = TEMP_FAILURE_RETRY (accept (sock, NULL, NULL));
-# endif
 
 	    /* Use the descriptor if we have not reached the limit.  */
 	    if (fd >= 0)
diff --git a/socket/Makefile b/socket/Makefile
index 25d4f68578..1e2555d66d 100644
--- a/socket/Makefile
+++ b/socket/Makefile
@@ -31,6 +31,8 @@ routines := accept bind connect getpeername getsockname getsockopt	\
 	    setsockopt shutdown socket socketpair isfdtype opensock	\
 	    sockatmark accept4 recvmmsg sendmmsg
 
+tests := tst-accept4
+
 aux	 := sa_len
 
 include ../Rules
diff --git a/socket/tst-accept4.c b/socket/tst-accept4.c
new file mode 100644
index 0000000000..c096e8c81b
--- /dev/null
+++ b/socket/tst-accept4.c
@@ -0,0 +1,129 @@
+/* Copyright (C) 2017 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <support/check.h>
+#include <support/xsocket.h>
+#include <support/xunistd.h>
+#include <sys/socket.h>
+
+static bool
+is_nonblocking (int fd)
+{
+  int status = fcntl (fd, F_GETFL);
+  if (status < 0)
+    FAIL_EXIT1 ("fcntl (F_GETFL): %m");
+  return status & O_NONBLOCK;
+}
+
+static bool
+is_cloexec (int fd)
+{
+  int status = fcntl (fd, F_GETFD);
+  if (status < 0)
+    FAIL_EXIT1 ("fcntl (F_GETFD): %m");
+  return status & FD_CLOEXEC;
+}
+
+struct client
+{
+  int socket;
+  struct sockaddr_in address;
+};
+
+/* Perform a non-blocking connect to *SERVER_ADDRESS.  */
+static struct client
+client_connect (const struct sockaddr_in *server_address)
+{
+  struct client result;
+  result.socket = xsocket (AF_INET,
+                           SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
+  TEST_VERIFY (is_nonblocking (result.socket));
+  TEST_VERIFY (is_cloexec (result.socket));
+  int ret = connect (result.socket, (const struct sockaddr *) server_address,
+                     sizeof (*server_address));
+  if (ret < 0 && errno != EINPROGRESS)
+    FAIL_EXIT1 ("client connect: %m");
+  socklen_t sa_len = sizeof (result.address);
+  xgetsockname (result.socket, (struct sockaddr *) &result.address,
+                &sa_len);
+  TEST_VERIFY (sa_len == sizeof (result.address));
+  return result;
+}
+
+static void
+check_same_address (const struct sockaddr_in *left,
+                    const struct sockaddr_in *right)
+{
+  TEST_VERIFY (left->sin_family == AF_INET);
+  TEST_VERIFY (right->sin_family == AF_INET);
+  TEST_VERIFY (left->sin_addr.s_addr == right->sin_addr.s_addr);
+  TEST_VERIFY (left->sin_port == right->sin_port);
+}
+
+static int
+do_test (void)
+{
+  /* Create server socket.  */
+  int server_socket = xsocket (AF_INET, SOCK_STREAM, 0);
+  TEST_VERIFY (!is_nonblocking (server_socket));
+  TEST_VERIFY (!is_cloexec (server_socket));
+  struct sockaddr_in server_address =
+    {
+      .sin_family = AF_INET,
+      .sin_addr = {.s_addr = htonl (INADDR_LOOPBACK) },
+    };
+  xbind (server_socket,
+         (struct sockaddr *) &server_address, sizeof (server_address));
+  {
+    socklen_t sa_len = sizeof (server_address);
+    xgetsockname (server_socket, (struct sockaddr *) &server_address,
+                  &sa_len);
+    TEST_VERIFY (sa_len == sizeof (server_address));
+  }
+  xlisten (server_socket, 5);
+
+  for (int do_nonblock = 0; do_nonblock < 2; ++do_nonblock)
+    for (int do_cloexec = 0; do_cloexec < 2; ++do_cloexec)
+      {
+        int sockflags = 0;
+        if (do_nonblock)
+          sockflags |= SOCK_NONBLOCK;
+        if (do_cloexec)
+          sockflags |= SOCK_CLOEXEC;
+
+        struct client client = client_connect (&server_address);
+        struct sockaddr_in client_address;
+        socklen_t sa_len = sizeof (client_address);
+        int client_socket = xaccept4 (server_socket,
+                                      (struct sockaddr *) &client_address,
+                                      &sa_len, sockflags);
+        TEST_VERIFY (sa_len == sizeof (client_address));
+        TEST_VERIFY (is_nonblocking (client_socket) == do_nonblock);
+        TEST_VERIFY (is_cloexec (client_socket) == do_cloexec);
+        check_same_address (&client.address, &client_address);
+        xclose (client_socket);
+        xclose (client.socket);
+      }
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/support/Makefile b/support/Makefile
index 1f33fa0c74..38dbd832e9 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -50,6 +50,7 @@ libsupport-routines = \
   temp_file \
   write_message \
   xaccept \
+  xaccept4 \
   xasprintf \
   xbind \
   xcalloc \
diff --git a/support/xaccept4.c b/support/xaccept4.c
new file mode 100644
index 0000000000..b676b58ed6
--- /dev/null
+++ b/support/xaccept4.c
@@ -0,0 +1,32 @@
+/* accept with error checking.
+   Copyright (C) 2016-2017 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/xsocket.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+
+int
+xaccept4 (int fd, struct sockaddr *sa, socklen_t *salen, int flags)
+{
+  int clientfd = accept4 (fd, sa, salen, flags);
+  if (clientfd < 0)
+    FAIL_EXIT1 ("accept4 (%d, 0x%x): %m", fd, flags);
+  return clientfd;
+}
diff --git a/support/xsocket.h b/support/xsocket.h
index 0dbf13ace9..d6724948d8 100644
--- a/support/xsocket.h
+++ b/support/xsocket.h
@@ -30,6 +30,7 @@ void xconnect (int, const struct sockaddr *, socklen_t);
 void xbind (int, const struct sockaddr *, socklen_t);
 void xlisten (int, int);
 int xaccept (int, struct sockaddr *, socklen_t *);
+int xaccept4 (int, struct sockaddr *, socklen_t *, int);
 void xsendto (int, const void *, size_t, int,
               const struct sockaddr *, socklen_t);
 size_t xrecvfrom (int, void *, size_t, int, struct sockaddr *, socklen_t *);
diff --git a/sysdeps/mach/hurd/kernel-features.h b/sysdeps/mach/hurd/kernel-features.h
index 20cb3ba7bf..196638829f 100644
--- a/sysdeps/mach/hurd/kernel-features.h
+++ b/sysdeps/mach/hurd/kernel-features.h
@@ -19,5 +19,3 @@
 /* This file can define __ASSUME_* macros checked by certain source files.
    Almost none of these are used outside of sysdeps/unix/sysv/linux code.
    But those referring to POSIX-level features like O_* flags can be.  */
-
-#define __ASSUME_ACCEPT4	1
diff --git a/sysdeps/nacl/kernel-features.h b/sysdeps/nacl/kernel-features.h
index 32834fd792..ba315b6638 100644
--- a/sysdeps/nacl/kernel-features.h
+++ b/sysdeps/nacl/kernel-features.h
@@ -19,7 +19,3 @@
 /* This file can define __ASSUME_* macros checked by certain source files.
    Almost none of these are used outside of sysdeps/unix/sysv/linux code.
    But those referring to POSIX-level features like O_* flags can be.  */
-
-/*
-#define __ASSUME_ACCEPT4	1
-*/
diff --git a/sysdeps/unix/sysv/linux/accept4.c b/sysdeps/unix/sysv/linux/accept4.c
index 53afd7a510..0592f43dd6 100644
--- a/sysdeps/unix/sysv/linux/accept4.c
+++ b/sysdeps/unix/sysv/linux/accept4.c
@@ -22,75 +22,20 @@
 
 #include <sysdep-cancel.h>
 #include <sys/syscall.h>
+#include <socketcall.h>
 #include <kernel-features.h>
 
+int
+accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
+{
 /* Do not use the accept4 syscall on socketcall architectures unless
    it was added at the same time as the socketcall support or can be
    assumed to be present.  */
 #if defined __ASSUME_SOCKETCALL \
     && !defined __ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL \
     && !defined __ASSUME_ACCEPT4_SYSCALL
-# undef __NR_accept4
-#endif
-
-#ifdef __NR_accept4
-int
-accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
-{
-  return SYSCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
-}
-#elif defined __NR_socketcall
-# include <socketcall.h>
-# ifdef __ASSUME_ACCEPT4_SOCKETCALL
-int
-accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
-{
   return SOCKETCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
-}
-# else
-static int have_accept4;
-
-int
-accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
-{
-  if (__glibc_likely (have_accept4 >= 0))
-    {
-      int ret = SOCKETCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len,
-				   flags);
-      /* The kernel returns -EINVAL for unknown socket operations.
-	 We need to convert that error to an ENOSYS error.  */
-      if (__builtin_expect (ret < 0, 0)
-	  && have_accept4 == 0
-	  && errno == EINVAL)
-	{
-	  /* Try another call, this time with the FLAGS parameter
-	     cleared and an invalid file descriptor.  This call will not
-	     cause any harm and it will return immediately.  */
-	  ret = SOCKETCALL_CANCEL (invalid, -1);
-	  if (errno == EINVAL)
-	    {
-	      have_accept4 = -1;
-	      __set_errno (ENOSYS);
-	    }
-	  else
-	    {
-	      have_accept4 = 1;
-	      __set_errno (EINVAL);
-	    }
-	  return -1;
-	}
-      return ret;
-    }
-  __set_errno (ENOSYS);
-  return -1;
-}
-# endif /* __ASSUME_ACCEPT4_SOCKETCALL  */
-#else /* __NR_socketcall   */
-int
-accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
-{
-  __set_errno (ENOSYS);
-  return -1;
-}
-stub_warning (accept4)
+#else
+  return SYSCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
 #endif
+}
diff --git a/sysdeps/unix/sysv/linux/ia64/kernel-features.h b/sysdeps/unix/sysv/linux/ia64/kernel-features.h
index ac9403e869..cda0ad6150 100644
--- a/sysdeps/unix/sysv/linux/ia64/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/ia64/kernel-features.h
@@ -22,13 +22,8 @@
 
 #include_next <kernel-features.h>
 
-/* Support for the accept4 syscall was added in 3.3.  */
-#if __LINUX_KERNEL_VERSION < 0x030300
-# undef __ASSUME_ACCEPT4_SYSCALL
-# undef __ASSUME_ACCEPT4
-#endif
-
 #define __ASSUME_RECV_SYSCALL   	1
 #define __ASSUME_SEND_SYSCALL		1
+#define __ASSUME_ACCEPT4_SYSCALL	1
 
 #endif /* _KERNEL_FEATURES_H */
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index fd936c5366..b981466f34 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -75,18 +75,11 @@
    architectures using a separate syscall rather than socketcall that
    syscall was only added later, and some architectures first had
    socketcall support then a separate syscall.  Define
-   __ASSUME_ACCEPT4_SOCKETCALL if glibc uses socketcall on this
-   architecture and accept4 is available through socketcall,
    __ASSUME_ACCEPT4_SYSCALL if it is available through a separate
-   syscall, __ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL if it became
+   syscall, and __ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL if it became
    available through a separate syscall at the same time as through
-   socketcall, and __ASSUME_ACCEPT4 if the accept4 function is known
-   to work.  */
-#ifdef __ASSUME_SOCKETCALL
-# define __ASSUME_ACCEPT4_SOCKETCALL	1
-#endif
+   socketcall.  */
 #define __ASSUME_ACCEPT4_SYSCALL	1
-#define __ASSUME_ACCEPT4	1
 
 /* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29.  */
 #define __ASSUME_FUTEX_CLOCK_REALTIME	1