[PATCH] wire up sys_accept4() on ARM

[Mikael Pettersson]

sys_accept4() was added in kernel 2.6.28, but ARM was not updated
to include it.  The number and types of parameters is such that
no ARM-specific processing is needed, so wiring up sys_accept4()
just requires defining __NR_accept4 and adding a direct call in
the syscall entry table.

Tested with an EABI 2.6.35 kernel and Ulrich Drepper's original
accept4() test program, modified to define __NR_accept4 for ARM.

Using the updated unistd.h also eliminates a warning then building
glibc (2.10.2 and newer) about accept4() being unimplemented.

Signed-off-by: Mikael Pettersson <mikpe at it.uu.se>
---
 arch/arm/include/asm/unistd.h |    1 +
 arch/arm/kernel/calls.S       |    1 +

 2 files changed, 2 insertions(+)
diff -rupN linux-2.6.35/arch/arm/include/asm/unistd.h linux-2.6.35.arm-sys_accept4/arch/arm/include/asm/unistd.h
--- linux-2.6.35/arch/arm/include/asm/unistd.h	2010-05-17 19:51:29.000000000 +0200
+++ linux-2.6.35.arm-sys_accept4/arch/arm/include/asm/unistd.h	2010-08-03 14:34:35.000000000 +0200
@@ -392,6 +392,7 @@
 #define __NR_rt_tgsigqueueinfo		(__NR_SYSCALL_BASE+363)
 #define __NR_perf_event_open		(__NR_SYSCALL_BASE+364)
 #define __NR_recvmmsg			(__NR_SYSCALL_BASE+365)
+#define __NR_accept4			(__NR_SYSCALL_BASE+366)
 
 /*
  * The following SWIs are ARM private.
diff -rupN linux-2.6.35/arch/arm/kernel/calls.S linux-2.6.35.arm-sys_accept4/arch/arm/kernel/calls.S
--- linux-2.6.35/arch/arm/kernel/calls.S	2010-05-17 19:51:29.000000000 +0200
+++ linux-2.6.35.arm-sys_accept4/arch/arm/kernel/calls.S	2010-08-03 14:34:35.000000000 +0200
@@ -375,6 +375,7 @@
 		CALL(sys_rt_tgsigqueueinfo)
 		CALL(sys_perf_event_open)
 /* 365 */	CALL(sys_recvmmsg)
+		CALL(sys_accept4)
 #ifndef syscalls_counted
 .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
 #define syscalls_counted