Add MADV_WIPEONFORK, MADV_KEEPONFORK from Linux 4.14
Commit Message
This patch adds the new MADV_WIPEONFORK and MADV_KEEPONFORK from Linux
4.14 to bits/mman-linux.h (and bits/mman.h in the hppa case). Note
there are further hppa MADV_* changes in 4.14; I plan a separate glibc
patch for those.
Tested for x86_64.
2017-11-15 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/bits/mman-linux.h
[__USE_MISC] (MADV_WIPEONFORK): New macro.
[__USE_MISC] (MADV_KEEPONFORK): Likewise.
* sysdeps/unix/sysv/linux/hppa/bits/mman.h
[__USE_MISC] (MADV_WIPEONFORK): Likewise.
[__USE_MISC] (MADV_KEEPONFORK): Likewise.
Comments
On 11/15/2017 07:31 PM, Joseph Myers wrote:
> 2017-11-15 Joseph Myers<joseph@codesourcery.com>
>
> * sysdeps/unix/sysv/linux/bits/mman-linux.h
> [__USE_MISC] (MADV_WIPEONFORK): New macro.
> [__USE_MISC] (MADV_KEEPONFORK): Likewise.
> * sysdeps/unix/sysv/linux/hppa/bits/mman.h
> [__USE_MISC] (MADV_WIPEONFORK): Likewise.
> [__USE_MISC] (MADV_KEEPONFORK): Likewise.
I double-checked the constants against the kernel sources. Looks good.
Thanks,
Florian
@@ -89,6 +89,8 @@
# define MADV_DONTDUMP 16 /* Explicity exclude from the core dump,
overrides the coredump filter bits. */
# define MADV_DODUMP 17 /* Clear the MADV_DONTDUMP flag. */
+# define MADV_WIPEONFORK 18 /* Zero memory on fork, child only. */
+# define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK. */
# define MADV_HWPOISON 100 /* Poison a page for testing. */
#endif
@@ -99,6 +99,8 @@
# define MADV_DONTDUMP 69 /* Explicity exclude from the core dump,
overrides the coredump filter bits */
# define MADV_DODUMP 70 /* Clear the MADV_NODUMP flag */
+# define MADV_WIPEONFORK 71 /* Zero memory on fork, child only. */
+# define MADV_KEEPONFORK 72 /* Undo MADV_WIPEONFORK. */
#endif
/* The POSIX people had to invent similar names for the same things. */