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authorAdhemerval Zanella Netto <adhemerval.zanella@linaro.org>2023-08-24 13:42:17 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2023-09-05 13:08:48 -0300
commitce2bfb856987526c2f27fb934b5eedd70d3472d7 (patch)
tree8ed44c62c873017fea57dcabb55b0d3eda0550a3 /bits
parentad77b1bcca2499f422528c0af4b6f5565512d8bd (diff)
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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 'bits')
-rw-r--r--bits/spawn_ext.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/bits/spawn_ext.h b/bits/spawn_ext.h
new file mode 100644
index 0000000..75b504a
--- /dev/null
+++ b/bits/spawn_ext.h
@@ -0,0 +1,21 @@
+/* POSIX spawn extensions. Generic version.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _SPAWN_H
+# error "Never include <bits/spawn-ext.h> directly; use <spawn.h> instead."
+#endif