implement mlock(), munlock(), mlockall(), munlockall()

[korli]

Used by qemu, openssl.

​http://pubs.opengroup.org/onlinepubs/9699919799//functions/mlock.html ​http://pubs.opengroup.org/onlinepubs/9699919799//functions/mlockall.html

Constants for mlockall: MCL_CURRENT, MCL_FUTURE ​https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/basedefs/sys_mman.h.html#tag_13_55

[CodeforEvolution]

As shown by:
​https://github.com/haikuports/haikuports/issues/1897
VirtualBox Guest Additions requires at least, "mlock()" and "munlock()"

[pulkomandy]

gcrypt also complains that this is missing. It should use it to make sure passwords and other sensitive data aren't accidentally swapped to disk.

[pulkomandy]

mlock and munlock added in hrev54754. Does anything relevant use mlockall/munlockall?

[korli]

​https://github.com/haikuports/haikuports/search?q=mlock for instance qemu

[pulkomandy]

I see only mlock() used there, I was asking about mlockall/munlockall (which we still don't implement but I think is used a lot less often)

[korli]

Replying to pulkomandy:

I see only mlock() used there, I was asking about mlockall/munlockall (which we still don't implement but I think is used a lot less often)

Indeed. I found a reference in mariadb: ​https://github.com/MariaDB/server/blob/295f3e4cfb4a8f132f36d53475efc92f2487aa97/sql/mysqld.cc#L5215

[przemub]

Hi, I ran into this ticket because ​uWSGI requires munlockall, MCL_CURRENT, MCL_FUTURE.

[korli]

Improved in hrev55986.

Missing: ​https://pubs.opengroup.org/onlinepubs/9699919799/functions/mlockall.html