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Implement accept4 for more archs using socketcall.

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So far accept4 was only supported on archs using socketcall for x86.
This patch adds support for the remaining archs.
This commit is contained in:
Jakub Jelinek
2009-05-22 08:25:34 -07:00
committed by Ulrich Drepper
parent be6b2e5cf3
commit 1e1dc4e82d
5 changed files with 76 additions and 4 deletions
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45
sysdeps/unix/sysv/linux/accept4.c
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@ -23,6 +23,7 @@
#include <sysdep-cancel.h>
#include <sys/syscall.h>
#include <kernel-features.h>
#ifdef __NR_accept4
@ -41,6 +42,50 @@ accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
return result;
}
#elif defined __NR_socketcall
# ifndef __ASSUME_ACCEPT4
extern int __internal_accept4 (int fd, __SOCKADDR_ARG addr,
socklen_t *addr_len, int flags)
attribute_hidden;
static int have_accept4;
int
accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
{
if (__builtin_expect (have_accept4 >= 0, 1))
{
int ret = __internal_accept4 (fd, addr, 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 = __internal_accept4 (-1, addr, addr_len, 0);
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;
}
# else
/* When __ASSUME_ACCEPT4 accept4 is defined in internal_accept4.S. */
# endif
#else
int
accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)