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Update netinet/tcp.h from Linux 4.18
- From: Joseph Myers <joseph at codesourcery dot com>
- To: <libc-alpha at sourceware dot org>
- Date: Fri, 17 Aug 2018 16:22:49 +0000
- Subject: Update netinet/tcp.h from Linux 4.18
This patch adds constants from netinet/tcp.h in Linux 4.18, and an
associated struct tcp_zerocopy_receive, to sysdeps/gnu/netinet/tcp.h.
The new TCP_REPAIR_* constants seemed sufficiently related to those
already present to include them.
Note that this patch does not include additions to struct tcp_info;
there are many other elements in this structure in the Linux kernel
that are not included in the glibc version (which was last extended in
2007, it seems). Such additions to the end of the structure may be OK
with the expected way it is used (size passed explicitly to the kernel
with getsockopt), but in principle any change to the size of a type
provided by glibc is an ABI change for external applications /
libraries using that type in their ABIs, and has the associated risks
of such a change.
Tested for x86_64.
2018-08-17 Joseph Myers <firstname.lastname@example.org>
* sysdeps/gnu/netinet/tcp.h (TCP_ZEROCOPY_RECEIVE): New macro.
(struct tcp_zerocopy_receive): New type.
diff --git a/sysdeps/gnu/netinet/tcp.h b/sysdeps/gnu/netinet/tcp.h
index 44a72e9..1be2dc7 100644
@@ -75,6 +75,14 @@
#define TCP_MD5SIG_EXT 32 /* TCP MD5 Signature with extensions. */
#define TCP_FASTOPEN_KEY 33 /* Set the key for Fast Open (cookie). */
#define TCP_FASTOPEN_NO_COOKIE 34 /* Enable TFO without a TFO cookie. */
+#define TCP_ZEROCOPY_RECEIVE 35
+#define TCP_INQ 36 /* Notify bytes available to read
+ as a cmsg on read. */
+#define TCP_CM_INQ TCP_INQ
+#define TCP_REPAIR_ON 1
+#define TCP_REPAIR_OFF 0
+#define TCP_REPAIR_OFF_NO_WP -1
# include <sys/types.h>
@@ -327,6 +335,14 @@ struct tcp_repair_window
+/* For use with TCP_ZEROCOPY_RECEIVE. */
+ uint64_t address; /* Address of mapping. */
+ uint32_t length; /* Number of bytes to map/mapped. */
+ uint32_t recv_skip_hint; /* Amount of bytes to skip. */
#endif /* Misc. */
#endif /* netinet/tcp.h */
Joseph S. Myers