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Add MADV_WIPEONFORK, MADV_KEEPONFORK from Linux 4.14
- From: Joseph Myers <joseph at codesourcery dot com>
- To: <libc-alpha at sourceware dot org>
- Date: Wed, 15 Nov 2017 18:31:06 +0000
- Subject: Add MADV_WIPEONFORK, MADV_KEEPONFORK from Linux 4.14
- Authentication-results: sourceware.org; auth=none
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.
diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h b/sysdeps/unix/sysv/linux/bits/mman-linux.h
index b091181..78c07c8 100644
--- a/sysdeps/unix/sysv/linux/bits/mman-linux.h
+++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h
@@ -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
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/mman.h b/sysdeps/unix/sysv/linux/hppa/bits/mman.h
index acf7002..4ad9153 100644
--- a/sysdeps/unix/sysv/linux/hppa/bits/mman.h
+++ b/sysdeps/unix/sysv/linux/hppa/bits/mman.h
@@ -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. */
--
Joseph S. Myers
joseph@codesourcery.com