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a8250d167c
Make sure that we only switch the cgroup namespace and enter a new cgroup in a child process separate from test_progs, to not mess up the environment for subsequent tests. To remove this cgroup, we need to wait for the child to exit, and then rmdir its cgroup. If the read call fails, or waitpid succeeds, we know the child exited (read call would fail when the last pipe end is closed, otherwise waitpid waits until exit(2) is called). We then invoke a newly introduced remove_cgroup_pid() helper, that identifies cgroup path using the passed in pid of the now dead child, instead of using the current process pid (getpid()). Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20250915032618.1551762-3-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __CGROUP_HELPERS_H
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#define __CGROUP_HELPERS_H
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#include <errno.h>
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#include <string.h>
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#define clean_errno() (errno == 0 ? "None" : strerror(errno))
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#define log_err(MSG, ...) fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \
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__FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
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/* cgroupv2 related */
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int enable_controllers(const char *relative_path, const char *controllers);
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int write_cgroup_file(const char *relative_path, const char *file,
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const char *buf);
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int write_cgroup_file_parent(const char *relative_path, const char *file,
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const char *buf);
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int cgroup_setup_and_join(const char *relative_path);
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int get_root_cgroup(void);
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int create_and_get_cgroup(const char *relative_path);
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void remove_cgroup(const char *relative_path);
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void remove_cgroup_pid(const char *relative_path, int pid);
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unsigned long long get_cgroup_id(const char *relative_path);
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int get_cgroup1_hierarchy_id(const char *subsys_name);
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int join_cgroup(const char *relative_path);
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int join_root_cgroup(void);
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int join_parent_cgroup(const char *relative_path);
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int set_cgroup_xattr(const char *relative_path,
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const char *name,
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const char *value);
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int setup_cgroup_environment(void);
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void cleanup_cgroup_environment(void);
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/* cgroupv1 related */
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int set_classid(void);
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int join_classid(void);
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unsigned long long get_classid_cgroup_id(void);
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int open_classid(void);
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int setup_classid_environment(void);
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void cleanup_classid_environment(void);
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#endif /* __CGROUP_HELPERS_H */
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