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mmap.2: Note that MAP_STACK exists on some other systems 

As noted in man-pages commit 99c3a00027,
MAP_STACK exists on at least OpenBSD and FreeBSD.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2019-11-14 12:52:40 +01:00
parent 1b54731692
commit d3d881232b
1 changed files with 4 additions and 0 deletions
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man2/mmap.2
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@ -403,6 +403,7 @@ is supported for private mappings only since Linux 2.6.23.
.BR MAP_STACK " (since Linux 2.6.27)"
Allocate the mapping at an address suitable for a process
or thread stack.
.IP
This flag is currently a no-op,
but is used in the glibc threading implementation so that
if some architectures require special treatment for stack allocations,
@ -412,6 +413,9 @@ support can later be transparently implemented for glibc.
.\" http://thread.gmane.org/gmane.linux.kernel/720412
.\" "pthread_create() slow for many threads; also time to revisit 64b
.\" context switch optimization?"
A further reason to employ this flag is portability:
.BR MAP_SHARED
exists (and has an effect) on some other systems (e.g., some of the BSDs).
.TP
.BR MAP_SYNC " (since Linux 4.15)"
This flag is available only with the