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Coordinate IPv6 definitions for Linux and glibc

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This change synchronizes the glibc headers with the Linux kernel
headers and arranges to coordinate the definition of structures
already defined the Linux kernel UAPI headers.

It is now safe to include glibc's netinet/in.h or Linux's linux/in6.h
in any order in a userspace application and you will get the same
ABI. The ABI is guaranteed by UAPI and glibc.
This commit is contained in:
Carlos O'Donell
2013-09-06 01:02:30 -04:00
parent 5430fc65a1
commit 6c82a2f8d7
3 changed files with 64 additions and 29 deletions
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12
sysdeps/unix/sysv/linux/bits/in.h
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@ -21,6 +21,18 @@
# error "Never use <bits/in.h> directly; include <netinet/in.h> instead."
#endif
/* If the application has already included linux/in6.h from a linux-based
kernel then we will not define the IPv6 IPPROTO_* defines, in6_addr (nor the
defines), sockaddr_in6, or ipv6_mreq. The ABI used by the linux-kernel and
glibc match exactly. Neither the linux kernel nor glibc should break this
ABI without coordination. */
#ifdef _UAPI_LINUX_IN6_H
/* This is not quite the same API since the kernel always defines s6_addr16 and
s6_addr32. This is not a violation of POSIX since POSIX says "at least the
following member" and that holds true. */
# define __USE_KERNEL_IPV6_DEFS
#endif
/* Options for use with `getsockopt' and `setsockopt' at the IP level.
The first word in the comment at the right is the data type used;
"bool" means a boolean value stored in an `int'. */