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configure: check for Linux specific unshare() with CLONE_FS

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Note we still need some kind of runtime detection as
it can fail in some constraint container setups, which
reject the whole unshare() syscall instead of just the
once used for container features.

In case unshare(CLONE_FS) works, we can have a per thread
current working directory and use [f]chdir() safely in
worker threads.

Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
This commit is contained in:
Ralph Boehme 2018-03-13 16:58:49 +01:00
parent 40d15260d2
commit 7cb27238fe
1 changed files with 5 additions and 0 deletions
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@ -1505,6 +1505,11 @@ main() {
legacy_quota_libs = ''
conf.env['legacy_quota_libs'] = legacy_quota_libs
conf.CHECK_CODE('(void)unshare(CLONE_FS);',
headers='sched.h',
define='HAVE_UNSHARE_CLONE_FS',
msg='for Linux unshare(CLONE_FS)')
#
# cluster support (CTDB)
#