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mlock.2: Document another ENOME error case 

ENOMEM can occur if locking/unlocking in the middle of a region
would increase the number of VMAs beyond the system limit (64k).

Reported-by: Mehdi Aqadjani Memar <m.aqadjanimemar@student.vu.nl>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-07-21 20:47:17 +02:00
parent 8e085a68d0
commit 555c445244
1 changed files with 9 additions and 0 deletions
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man2/mlock.2
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@ -170,6 +170,15 @@ was not a multiple of the page size.
.B ENOMEM
Some of the specified address range does not correspond to mapped
pages in the address space of the process.
.TP
.B ENOMEM
Locking or unlocking a region would result in the total number of
mappings with distinct attributes (e.g., locked versus unlocked)
exceeding the allowed maximum.
.\" I.e., the number of VMAs would exceed the 64kB maximum
(For example, unlocking a range in the middle of a currently locked
mapping would result in three mappings:
two locked mappings at each end and an unlocked mapping in the middle.)
.LP
For
.BR mlockall ():