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mmap.2: Simplify mention of MAP_FIXED_NOREPLACE in the discussion of MAP_FIXED 

After discussions with Jann Horn and John Hubbard.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2018-04-13 08:44:24 +02:00
parent 528cc762d9
commit fd859eb599
1 changed files with 4 additions and 9 deletions
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@ -285,15 +285,10 @@ and the PAM libraries
.UR http://www.linux-pam.org .UR http://www.linux-pam.org
.UE . .UE .
.IP .IP
For cases in which the specified memory region has not been reserved using an Since Linux 4.17, the
existing mapping, newer kernels (Linux 4.17 and later) provide an option .BR MAP_FIXED_NOREPLACE
.B MAP_FIXED_NOREPLACE flag can be used in a multithreaded program to avoid the hazard
that should be used instead; older kernels require the caller to use described above.
.I addr
as a hint (without
.BR MAP_FIXED )
and take appropriate action if the kernel places the new mapping at a
different address.
.TP .TP
.BR MAP_FIXED_NOREPLACE " (since Linux 4.17)" .BR MAP_FIXED_NOREPLACE " (since Linux 4.17)"
.\" commit a4ff8e8620d3f4f50ac4b41e8067b7d395056843 .\" commit a4ff8e8620d3f4f50ac4b41e8067b7d395056843