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commit 76e5216e317f39da2bc5bf905721cd9554ee6d09
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Author: Joseph Myers <joseph@codesourcery.com>
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Date:   Mon Jun 23 15:48:42 2014 +0000
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    Update headers for Linux 3.15.
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    This patch updates glibc headers for changes / new definitions in
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    Linux 3.15.  In the course of my review I noticed that
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    IPV6_PMTUDISC_INTERFACE was absent from glibc despite the inclusion of
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    IP_PMTUDISC_INTERFACE; I added it along with IP_PMTUDISC_OMIT and
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    IPV6_PMTUDISC_OMIT.  I did not add FALLOC_FL_NO_HIDE_STALE given the
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    kernel header comment that it is reserved.
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    Tested x86_64.
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            * sysdeps/unix/sysv/linux/bits/fcntl-linux.h [__USE_GNU]
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            (FALLOC_FL_COLLAPSE_RANGE): New macro.
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            [__USE_GNU] (FALLOC_FL_ZERO_RANGE): Likewise.
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            * sysdeps/unix/sysv/linux/bits/in.h (IP_PMTUDISC_OMIT): Likewise.
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            (IPV6_PMTUDISC_INTERFACE): Likewise.
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            (IPV6_PMTUDISC_OMIT): Likewise.
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Only the sysdeps/unix/sysv/linux/bits/in.h part is backported in this
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patch.  The sysdeps/unix/sysv/linux/bits/fcntl-linux.h part was
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completely superseded by glibc-rh1476120.patch, which uses
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<linux/falloc.h> in favor of duplicated constants.
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diff --git a/sysdeps/unix/sysv/linux/bits/in.h b/sysdeps/unix/sysv/linux/bits/in.h
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index ac07d17d0e9dc9c9..23046d3b5a6b0d91 100644
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--- a/sysdeps/unix/sysv/linux/bits/in.h
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+++ b/sysdeps/unix/sysv/linux/bits/in.h
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@@ -109,6 +109,8 @@
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    Also incoming ICMP frag_needed notifications will be ignored on
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    this socket to prevent accepting spoofed ones.  */
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 #define IP_PMTUDISC_INTERFACE           4
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+/* Like IP_PMTUDISC_INTERFACE but allow packets to be fragmented.  */
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+#define IP_PMTUDISC_OMIT		5
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 #define IP_MULTICAST_IF			32
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 #define IP_MULTICAST_TTL 		33
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@@ -224,6 +226,8 @@ struct in_pktinfo
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 #define IPV6_PMTUDISC_WANT	1	/* Use per route hints.  */
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 #define IPV6_PMTUDISC_DO	2	/* Always DF.  */
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 #define IPV6_PMTUDISC_PROBE	3	/* Ignore dst pmtu.  */
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+#define IPV6_PMTUDISC_INTERFACE	4	/* See IP_PMTUDISC_INTERFACE.  */
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+#define IPV6_PMTUDISC_OMIT	5	/* See IP_PMTUDISC_OMIT.  */
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 /* Socket level values for IPv6.  */
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 #define SOL_IPV6        41