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;
}
int accept4(int fd, struct sockaddr *addr, socklen_t *addrlen, int flags) {
return __internal_accept4(fd, addr, addrlen, flags);
}
int accept(int fd, struct sockaddr *addr, socklen_t *addrlen) {
return __internal_accept4(fd, addr, addrlen, 0);
}
