Consolidate Linux recvfrom implementation

This patch consolidates the recvfrom Linux syscall implementation on
sysdeps/unix/sysv/linux/recvfrom.c.  The changes are:

  1. Define __ASSUME_RECVFROM_SYSCALL by default
  2. Undef it for  architectures that do not support __NR_recvfrom.

Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
aarch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu.

	* sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove recvfrom from
	auto-generation list.
	* sysdeps/unix/sysv/linux/arm/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/generic/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/hppa/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/i386/kernel-features.h
	* sysdeps/unix/sysv/linux/kernel-features.h
	(__ASSUME_RECVFROM_SYSCALL): Define by default.
	(__ASSUME_RECVFROM_SYSCALL): Undef it if kernel does not support
	__NR_recvfrom.
	* sysdeps/unix/sysv/linux/m68k/kernel-features.h
	(__ASSUME_RECVFROM_SYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/s390/kernel-features.h
	(__ASSUME_RECVFROM_SYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/microblaze/kernel-features.h
	(__ASSUME_RECVFROM_SYSCALL): Remove definition.
	* sysdeps/unix/sysv/linux/powerpc/kernel-features.h
	(__ASSUME_RECVFROM_SYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/sh/kernel-features.h
	(__ASSUME_RECVFROM_SYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/sparc/kernel-features.h
	(__ASSUME_RECVFROM_SYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/recvfrom.c: Simplify includes.

18 files changed, 33 insertions, 19 deletions

diff --git a/ChangeLog b/ChangeLog
index 95b0856ad4..9b8d4053d4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,33 @@
 2016-03-08  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove recvfrom from
+	auto-generation list.
+	* sysdeps/unix/sysv/linux/arm/syscalls.list: Likewise.
+	* sysdeps/unix/sysv/linux/generic/syscalls.list: Likewise.
+	* sysdeps/unix/sysv/linux/hppa/syscalls.list: Likewise.
+	* sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/syscalls.list: Likewise.
+	* sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise.
+	* sysdeps/unix/sysv/linux/i386/kernel-features.h
+	(__ASSUME_RECVFROM_SYSCALL): Define by default.
+	* sysdeps/unix/sysv/linux/kernel-features.h
+	(__ASSUME_RECVFROM_SYSCALL): Undef it if kernel does not support
+	__NR_recvfrom.
+	* sysdeps/unix/sysv/linux/m68k/kernel-features.h
+	(__ASSUME_RECVFROM_SYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/s390/kernel-features.h
+	(__ASSUME_RECVFROM_SYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/microblaze/kernel-features.h
+	(__ASSUME_RECVFROM_SYSCALL): Remove definition.
+	* sysdeps/unix/sysv/linux/powerpc/kernel-features.h
+	(__ASSUME_RECVFROM_SYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/sh/kernel-features.h
+	(__ASSUME_RECVFROM_SYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/sparc/kernel-features.h
+	(__ASSUME_RECVFROM_SYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/recvfrom.c: Simplify includes.
+
 	* sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove connect from
 	auto-generation list.
 	* sysdeps/unix/sysv/linux/arm/syscalls.list: Likewise.
diff --git a/sysdeps/unix/sysv/linux/alpha/syscalls.list b/sysdeps/unix/sysv/linux/alpha/syscalls.list
index e9efb43b56..9cb44c1383 100644
--- a/sysdeps/unix/sysv/linux/alpha/syscalls.list
+++ b/sysdeps/unix/sysv/linux/alpha/syscalls.list
@@ -11,7 +11,6 @@ getsockname	-	getsockname	i:ipp	__getsockname	getsockname
 getsockopt	-	getsockopt	i:iiiBN	__getsockopt	getsockopt
 listen		-	listen		i:ii	__listen	listen
 recv		-	recv		Ci:ibni	__libc_recv	__recv recv
-recvfrom	-	recvfrom	Ci:ibniBN	__libc_recvfrom	__recvfrom recvfrom
 send		-	send		Ci:ibni	__libc_send	__send send
 sendto		-	sendto		Ci:ibnibn	__libc_sendto	__sendto sendto
 setsockopt	-	setsockopt	i:iiibn	__setsockopt	setsockopt
diff --git a/sysdeps/unix/sysv/linux/arm/syscalls.list b/sysdeps/unix/sysv/linux/arm/syscalls.list
index 1c12be4eef..dc4f52a66b 100644
--- a/sysdeps/unix/sysv/linux/arm/syscalls.list
+++ b/sysdeps/unix/sysv/linux/arm/syscalls.list
@@ -28,7 +28,6 @@ getsockname	-	getsockname	i:ipp	__getsockname	getsockname
 getsockopt	-	getsockopt	i:iiiBN	__getsockopt	getsockopt
 listen		-	listen		i:ii	__listen	listen
 recv		-	recv		Ci:ibni	__libc_recv	__recv recv
-recvfrom	-	recvfrom	Ci:ibniBN	__libc_recvfrom	__recvfrom recvfrom
 send		-	send		Ci:ibni	__libc_send	__send send
 sendto		-	sendto		Ci:ibnibn	__libc_sendto	__sendto sendto
 setsockopt	-	setsockopt	i:iiibn	__setsockopt	setsockopt
diff --git a/sysdeps/unix/sysv/linux/generic/syscalls.list b/sysdeps/unix/sysv/linux/generic/syscalls.list
index 2874a1f8c7..c16ee52dfd 100644
--- a/sysdeps/unix/sysv/linux/generic/syscalls.list
+++ b/sysdeps/unix/sysv/linux/generic/syscalls.list
@@ -8,7 +8,6 @@ listen		-	listen		i:ii	__listen	listen
 getsockname	-	getsockname	i:ipp	__getsockname	getsockname
 getpeername	-	getpeername	i:ipp	__getpeername	getpeername
 sendto		-	sendto		Ci:ibnibn	__libc_sendto	__sendto sendto
-recvfrom	-	recvfrom	Ci:ibniBN	__libc_recvfrom	__recvfrom recvfrom
 setsockopt	-	setsockopt	i:iiibn	__setsockopt	setsockopt
 getsockopt	-	getsockopt	i:iiiBN	__getsockopt	getsockopt
 shutdown	-	shutdown	i:ii	__shutdown	shutdown
diff --git a/sysdeps/unix/sysv/linux/hppa/syscalls.list b/sysdeps/unix/sysv/linux/hppa/syscalls.list
index 288d096820..88341157d1 100644
--- a/sysdeps/unix/sysv/linux/hppa/syscalls.list
+++ b/sysdeps/unix/sysv/linux/hppa/syscalls.list
@@ -7,7 +7,6 @@ getsockname	-	getsockname	i:ipp	__getsockname	getsockname
 getsockopt	-	getsockopt	i:iiiBN	__getsockopt	getsockopt
 listen		-	listen		i:ii	__listen	listen
 recv		-	recv		Ci:ibni	__libc_recv	__recv recv
-recvfrom	-	recvfrom	Ci:ibniBN	__libc_recvfrom	__recvfrom recvfrom
 send		-	send		Ci:ibni	__libc_send	__send send
 sendto		-	sendto		Ci:ibnibn	__libc_sendto	__sendto sendto
 setsockopt	-	setsockopt	i:iiibn	__setsockopt	setsockopt
diff --git a/sysdeps/unix/sysv/linux/i386/kernel-features.h b/sysdeps/unix/sysv/linux/i386/kernel-features.h
index 23ca79437f..4ccab5d74e 100644
--- a/sysdeps/unix/sysv/linux/i386/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/i386/kernel-features.h
@@ -38,7 +38,6 @@
 # define __ASSUME_GETPEERNAME_SYSCALL        1
 # define __ASSUME_SENDTO_SYSCALL             1
 # define __ASSUME_SENDTO_FOR_SEND_SYSCALL    1
-# define __ASSUME_RECVFROM_SYSCALL           1
 # define __ASSUME_RECVFROM_FOR_RECV_SYSCALL  1
 # define __ASSUME_SHUTDOWN_SYSCALL           1
 #endif
@@ -52,6 +51,7 @@
 # undef __ASSUME_SENDMSG_SYSCALL
 # undef __ASSUME_RECVMSG_SYSCALL
 # undef __ASSUME_CONNECT_SYSCALL
+# undef __ASSUME_RECVFROM_SYSCALL
 #endif
 
 /* i686 only supports ipc syscall.  */
diff --git a/sysdeps/unix/sysv/linux/ia64/syscalls.list b/sysdeps/unix/sysv/linux/ia64/syscalls.list
index 32fdb0878b..57020a9f5a 100644
--- a/sysdeps/unix/sysv/linux/ia64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/ia64/syscalls.list
@@ -11,7 +11,6 @@ getsockname	-	getsockname	i:ipp	__getsockname	getsockname
 getsockopt	-	getsockopt	i:iiiBN	__getsockopt	getsockopt
 listen		-	listen		i:ii	__listen	listen
 recv		-	recv		Ci:ibni	__libc_recv	__recv recv
-recvfrom	-	recvfrom	Ci:ibniBN	__libc_recvfrom	__recvfrom recvfrom
 send		-	send		Ci:ibni	__libc_send	__send send
 sendto		-	sendto		Ci:ibnibn	__libc_sendto	__sendto sendto
 setsockopt	-	setsockopt	i:iiibn	__setsockopt	setsockopt
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index e93f5f441f..c6c816eb29 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -149,6 +149,7 @@
 #define __ASSUME_RECVMSG_SYSCALL	1
 #define __ASSUME_ACCEPT_SYSCALL		1
 #define __ASSUME_CONNECT_SYSCALL	1
+#define __ASSUME_RECVFROM_SYSCALL	1
 
 /* Support for SysV IPC through wired syscalls.  All supported architectures
    either support ipc syscall and/or all the ipc correspondent syscalls.  */
diff --git a/sysdeps/unix/sysv/linux/m68k/kernel-features.h b/sysdeps/unix/sysv/linux/m68k/kernel-features.h
index e19ccf72b8..fa874b37b8 100644
--- a/sysdeps/unix/sysv/linux/m68k/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/m68k/kernel-features.h
@@ -32,7 +32,6 @@
 # define __ASSUME_GETPEERNAME_SYSCALL        1
 # define __ASSUME_SENDTO_SYSCALL             1
 # define __ASSUME_SENDTO_FOR_SEND_SYSCALL    1
-# define __ASSUME_RECVFROM_SYSCALL           1
 # define __ASSUME_RECVFROM_FOR_RECV_SYSCALL  1
 # define __ASSUME_SHUTDOWN_SYSCALL           1
 #endif
@@ -48,6 +47,7 @@
 # undef __ASSUME_SENDMSG_SYSCALL
 # undef __ASSUME_RECVMSG_SYSCALL
 # undef __ASSUME_CONNECT_SYSCALL
+# undef __ASSUME_RECVFROM_SYSCALL
 #endif
 
 /* No support for PI futexes or robust mutexes before 3.10 for m68k.  */
diff --git a/sysdeps/unix/sysv/linux/microblaze/kernel-features.h b/sysdeps/unix/sysv/linux/microblaze/kernel-features.h
index 9532d5716e..e4bf4d52c8 100644
--- a/sysdeps/unix/sysv/linux/microblaze/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/microblaze/kernel-features.h
@@ -30,7 +30,6 @@
 #define __ASSUME_SEND_SYSCALL		1
 #define __ASSUME_SENDTO_SYSCALL		1
 #define __ASSUME_RECV_SYSCALL		1
-#define __ASSUME_RECVFROM_SYSCALL	1
 #define __ASSUME_SHUTDOWN_SYSCALL	1
 #define __ASSUME_GETSOCKOPT_SYSCALL	1
 #define __ASSUME_SETSOCKOPT_SYSCALL	1
diff --git a/sysdeps/unix/sysv/linux/mips/syscalls.list b/sysdeps/unix/sysv/linux/mips/syscalls.list
index 8b0c5a3ad6..053574edc5 100644
--- a/sysdeps/unix/sysv/linux/mips/syscalls.list
+++ b/sysdeps/unix/sysv/linux/mips/syscalls.list
@@ -18,7 +18,6 @@ getsockname	-	getsockname	i:ipp	__getsockname	getsockname
 getsockopt	-	getsockopt	i:iiiBN	__getsockopt	getsockopt
 listen		-	listen		i:ii	__listen	listen
 recv		-	recv		Ci:ibni	__libc_recv	__recv recv
-recvfrom	-	recvfrom	Ci:ibniBN __libc_recvfrom __recvfrom recvfrom
 send		-	send		Ci:ibni	__libc_send	__send send
 sendto		-	sendto		Ci:ibnibn __libc_sendto	__sendto sendto
 setsockopt	-	setsockopt	i:iiibn	__setsockopt	setsockopt
diff --git a/sysdeps/unix/sysv/linux/powerpc/kernel-features.h b/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
index 272800c263..a0d2e8fece 100644
--- a/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
@@ -31,7 +31,6 @@
 #define __ASSUME_SEND_SYSCALL		1
 #define __ASSUME_SENDTO_SYSCALL		1
 #define __ASSUME_RECV_SYSCALL		1
-#define __ASSUME_RECVFROM_SYSCALL	1
 #define __ASSUME_SHUTDOWN_SYSCALL	1
 #define __ASSUME_GETSOCKOPT_SYSCALL	1
 #define __ASSUME_SETSOCKOPT_SYSCALL	1
diff --git a/sysdeps/unix/sysv/linux/recvfrom.c b/sysdeps/unix/sysv/linux/recvfrom.c
index 10ffb261ea..27c2360f64 100644
--- a/sysdeps/unix/sysv/linux/recvfrom.c
+++ b/sysdeps/unix/sysv/linux/recvfrom.c
@@ -15,14 +15,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <signal.h>
 #include <sys/socket.h>
-
 #include <sysdep-cancel.h>
 #include <socketcall.h>
-#include <kernel-features.h>
-#include <sys/syscall.h>
 
 ssize_t
 __libc_recvfrom (int fd, void *buf, size_t len, int flags,
diff --git a/sysdeps/unix/sysv/linux/s390/kernel-features.h b/sysdeps/unix/sysv/linux/s390/kernel-features.h
index 50a7e8cc2a..29738afcb6 100644
--- a/sysdeps/unix/sysv/linux/s390/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/s390/kernel-features.h
@@ -32,7 +32,6 @@
 # define __ASSUME_GETPEERNAME_SYSCALL        1
 # define __ASSUME_SENDTO_SYSCALL             1
 # define __ASSUME_SENDTO_FOR_SEND_SYSCALL    1
-# define __ASSUME_RECVFROM_SYSCALL           1
 # define __ASSUME_RECVFROM_FOR_RECV_SYSCALL  1
 # define __ASSUME_SHUTDOWN_SYSCALL           1
 #endif
@@ -48,6 +47,7 @@
 # undef __ASSUME_SENDMSG_SYSCALL
 # undef __ASSUME_RECVMSG_SYSCALL
 # undef __ASSUME_CONNECT_SYSCALL
+# undef __ASSUME_RECVFROM_SYSCALL
 #endif
 
 /* s390 only supports ipc syscall.  */
diff --git a/sysdeps/unix/sysv/linux/sh/kernel-features.h b/sysdeps/unix/sysv/linux/sh/kernel-features.h
index 7a83211661..5ed5f93a66 100644
--- a/sysdeps/unix/sysv/linux/sh/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/sh/kernel-features.h
@@ -34,7 +34,6 @@
 #define __ASSUME_SEND_SYSCALL		1
 #define __ASSUME_SENDTO_SYSCALL		1
 #define __ASSUME_RECV_SYSCALL		1
-#define __ASSUME_RECVFROM_SYSCALL	1
 #define __ASSUME_SHUTDOWN_SYSCALL	1
 #define __ASSUME_GETSOCKOPT_SYSCALL	1
 #define __ASSUME_SETSOCKOPT_SYSCALL	1
diff --git a/sysdeps/unix/sysv/linux/sparc/kernel-features.h b/sysdeps/unix/sysv/linux/sparc/kernel-features.h
index ba6e4c44e7..8e74478e27 100644
--- a/sysdeps/unix/sysv/linux/sparc/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/sparc/kernel-features.h
@@ -41,6 +41,7 @@
 #if !defined __arch64__
 # undef __ASSUME_ACCEPT_SYSCALL
 # undef __ASSUME_CONNECT_SYSCALL
+# undef __ASSUME_RECVFROM_SYSCALL
 #endif
 
 /* sparc only supports ipc syscall.  */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list b/sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list
index 4c785fd019..f73b5195f4 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list
@@ -8,7 +8,6 @@ getsockname	-	getsockname	3	__getsockname	getsockname
 getsockopt	-	getsockopt	5	__getsockopt	getsockopt
 listen		-	listen		2	__listen	listen
 recv		-	recv		C:4	__libc_recv	__recv recv
-recvfrom	-	recvfrom	C:6	__libc_recvfrom	__recvfrom recvfrom
 send		-	send		C:4	__libc_send	__send send
 sendto		-	sendto		C:6	__libc_sendto	__sendto sendto
 setsockopt	-	setsockopt	5	__setsockopt	setsockopt
diff --git a/sysdeps/unix/sysv/linux/x86_64/syscalls.list b/sysdeps/unix/sysv/linux/x86_64/syscalls.list
index b832593823..7ff03761e2 100644
--- a/sysdeps/unix/sysv/linux/x86_64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/x86_64/syscalls.list
@@ -15,7 +15,6 @@ getpeername	-	getpeername	i:ipp	__getpeername	getpeername
 getsockname	-	getsockname	i:ipp	__getsockname	getsockname
 getsockopt	-	getsockopt	i:iiiBN	__getsockopt	getsockopt
 listen		-	listen		i:ii	__listen	listen
-recvfrom	-	recvfrom	Ci:ibniBN	__libc_recvfrom	__recvfrom recvfrom
 sendto		-	sendto		Ci:ibnibn	__libc_sendto	__sendto sendto
 setsockopt	-	setsockopt	i:iiibn	__setsockopt	setsockopt
 shutdown	-	shutdown	i:ii	__shutdown	shutdown