Add MAP_NOCORE to mmap(2), and MADV_NOCORE and MADV_CORE to madvise(2).

This
This feature allows you to specify if mmap'd data is included in
an application's corefile.

Change the type of eflags in struct vm_map_entry from u_char to
vm_eflags_t (an unsigned int).

Reviewed by:	dillon,jdp,alfred
Approved by:	jkh

2 files changed, 8 insertions, 0 deletions

diff --git a/lib/libc/sys/madvise.2 b/lib/libc/sys/madvise.2
index 9a82782..1f8aec0 100644
--- a/lib/libc/sys/madvise.2
+++ b/lib/libc/sys/madvise.2
@@ -60,6 +60,8 @@ The known behaviors are given in
 #define	MADV_FREE	5 /* data is now unimportant */
 #define MADV_NOSYNC	6 /* no explicit commit to physical backing store */
 #define MADV_AUTOSYNC	7 /* default commit method to physical backing store */
+#define MADV_NOCORE	8 /* do not include these pages in a core file */
+#define MADV_CORE	9 /* revert to including pages in a core file */
 .Ed
 .Pp
 .Bl -tag -width MADV_SEQUENTIAL 
@@ -123,6 +125,10 @@ may or may not be reverted.  You can guarentee reversion by using the
 or
 .Xr fsync 2
 system calls.
+.It Dv MADV_NOCORE
+Region is not included in a core file.
+.It Dv MADV_CORE
+Include region in a core file.
 .El
 .Sh RETURN VALUES
 Upon successful completion,
diff --git a/lib/libc/sys/mmap.2 b/lib/libc/sys/mmap.2
index 433f8b7..185b7b8 100644
--- a/lib/libc/sys/mmap.2
+++ b/lib/libc/sys/mmap.2
@@ -179,6 +179,8 @@ system call is obsolete since
 implements a coherent filesystem buffer cache.  However, it may be 
 used to associate dirty VM pages with filesystem buffers and thus cause
 them to be flushed to physical media sooner rather then later.
+.It Dv MAP_NOCORE
+Region is not included in a core file.
 .El
 .Pp
 The