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moby--moby/daemon/stats
Pavel Tikhomirov dec084962e Do not treat C.sysconf(C._SC_NPROCESSORS_ONLN) non-zero errno as error
Treat return code -1 as error instead.

People from glibc say that errno is undefined in case of successful
sysconf call according to POSIX standard:
Glibc bug: https://sourceware.org/bugzilla/show_bug.cgi?id=21536

More over in sysconf man it is wrongly said that "errno is not changed"
on success. So I've created a bug to man-pages:
https://bugzilla.kernel.org/show_bug.cgi?id=195955

Background: Glibc's sysconf(_SC_NPROCESSORS_ONLN) changes errno to
ENOENT, if there is no /sys/devices/system/cpu/online file, while
the call itself is successful. In Virtuozzo containers we prohibit
most of sysfs files for security reasons. So we have Run():daemon
/stats/collector.go infinitely loop never actualy collecting stats
from publisher pairs.

v2: add comment

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
2017-06-01 18:23:49 +03:00
..
collector.go Correct CPU usage calculation in presence of offline CPUs and newer Linux 2017-03-10 10:24:33 +00:00
collector_solaris.go Extract daemon statsCollector to its own package 2017-01-04 18:18:30 +01:00
collector_unix.go Do not treat C.sysconf(C._SC_NPROCESSORS_ONLN) non-zero errno as error 2017-06-01 18:23:49 +03:00
collector_windows.go Correct CPU usage calculation in presence of offline CPUs and newer Linux 2017-03-10 10:24:33 +00:00
types.go Extract daemon statsCollector to its own package 2017-01-04 18:18:30 +01:00