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| author | Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> | 2023-08-24 13:42:17 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-09-05 13:08:48 -0300 |
| commit | ce2bfb856987526c2f27fb934b5eedd70d3472d7 (patch) | |
| tree | 8ed44c62c873017fea57dcabb55b0d3eda0550a3 /posix | |
| parent | ad77b1bcca2499f422528c0af4b6f5565512d8bd (diff) | |
| download | glibc-ce2bfb856987526c2f27fb934b5eedd70d3472d7.zip glibc-ce2bfb856987526c2f27fb934b5eedd70d3472d7.tar.gz glibc-ce2bfb856987526c2f27fb934b5eedd70d3472d7.tar.bz2 | |
linux: Add posix_spawnattr_{get, set}cgroup_np (BZ 26371)
These functions allow to posix_spawn and posix_spawnp to use
CLONE_INTO_CGROUP with clone3, allowing the child process to
be created in a different cgroup version 2. These are GNU
extensions that are available only for Linux, and also only
for the architectures that implement clone3 wrapper
(HAVE_CLONE3_WRAPPER).
To create a process on a different cgroupv2, one can use the:
posix_spawnattr_t attr;
posix_spawnattr_init (&attr);
posix_spawnattr_setflags (&attr, POSIX_SPAWN_SETCGROUP);
posix_spawnattr_setcgroup_np (&attr, cgroup);
posix_spawn (...)
Similar to other posix_spawn flags, POSIX_SPAWN_SETCGROUP control
whether the cgroup file descriptor will be used or not with
clone3.
There is no fallback if either clone3 does not support the flag
or if the architecture does not provide the clone3 wrapper, in
this case posix_spawn returns EOPNOTSUPP.
Checked on x86_64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Diffstat (limited to 'posix')
| -rw-r--r-- | posix/Makefile | 1 | ||||
| -rw-r--r-- | posix/spawn.h | 6 | ||||
| -rw-r--r-- | posix/spawnattr_setflags.c | 3 |
3 files changed, 8 insertions, 2 deletions
diff --git a/posix/Makefile b/posix/Makefile index 3d368b9..70faad4 100644 --- a/posix/Makefile +++ b/posix/Makefile @@ -37,6 +37,7 @@ headers := \ bits/pthreadtypes-arch.h \ bits/pthreadtypes.h \ bits/sched.h \ + bits/spawn_ext.h \ bits/thread-shared-types.h \ bits/types.h \ bits/types/idtype_t.h \ diff --git a/posix/spawn.h b/posix/spawn.h index 04cc525..731862c 100644 --- a/posix/spawn.h +++ b/posix/spawn.h @@ -34,7 +34,8 @@ typedef struct sigset_t __ss; struct sched_param __sp; int __policy; - int __pad[16]; + int __cgroup; + int __pad[15]; } posix_spawnattr_t; @@ -59,6 +60,7 @@ typedef struct #ifdef __USE_GNU # define POSIX_SPAWN_USEVFORK 0x40 # define POSIX_SPAWN_SETSID 0x80 +# define POSIX_SPAWN_SETCGROUP 0x100 #endif @@ -231,4 +233,6 @@ posix_spawn_file_actions_addtcsetpgrp_np (posix_spawn_file_actions_t *, __END_DECLS +#include <bits/spawn_ext.h> + #endif /* spawn.h */ diff --git a/posix/spawnattr_setflags.c b/posix/spawnattr_setflags.c index 9715394..e7bb217 100644 --- a/posix/spawnattr_setflags.c +++ b/posix/spawnattr_setflags.c @@ -26,7 +26,8 @@ | POSIX_SPAWN_SETSCHEDPARAM \ | POSIX_SPAWN_SETSCHEDULER \ | POSIX_SPAWN_SETSID \ - | POSIX_SPAWN_USEVFORK) + | POSIX_SPAWN_USEVFORK \ + | POSIX_SPAWN_SETCGROUP) /* Store flags in the attribute structure. */ int |