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mmap.2: MAP_FIXED is no longer discouraged 

MAP_FIXED has been widely used for a very long time, yet the man
page still claims that "the use of this option is discouraged".

The documentation assumes that "less portable" == "must be discouraged".

Instead of discouraging something that is so useful and widely used,
change the documentation to explain its limitations better.

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
John Hubbard 2017-12-01 18:16:26 -08:00 committed by Michael Kerrisk
parent 0f24751222
commit ffa518803e
1 changed files with 4 additions and 2 deletions
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man2/mmap.2
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@ -222,8 +222,10 @@ part of the existing mapping(s) will be discarded.
If the specified address cannot be used,
.BR mmap ()
will fail.
Because requiring a fixed address for a mapping is less portable,
the use of this option is discouraged.
Software that aspires to be portable should use this option with care, keeping
in mind that the exact layout of a process' memory map is allowed to change
significantly between kernel versions, C library versions, and operating system
releases.
.TP
.B MAP_GROWSDOWN
This flag is used for stacks.