Assume that accept4 is always available and works

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.

For ia64, the accept4 system call (and socket call) were backported
in kernel version 3.2.18.  Reflect this in the installation
instructions.

1 files changed, 1 insertions, 0 deletions

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 *);