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pidfs: allow to retrieve exit information

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Some tools like systemd's jounral need to retrieve the exit and cgroup
information after a process has already been reaped. This can e.g.,
happen when retrieving a pidfd via SCM_PIDFD or SCM_PEERPIDFD.

Link: https://lore.kernel.org/r/20250305-work-pidfs-kill_on_last_close-v3-6-c8c3d8361705@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2025-03-05 13:26:17 +01:00
parent 4513522984
commit 7477d7dce4
2 changed files with 70 additions and 19 deletions
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include/uapi/linux/pidfd.h
+2 -1
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@@ -20,6 +20,7 @@
#define PIDFD_INFO_PID (1UL << 0) /* Always returned, even if not requested */
#define PIDFD_INFO_CREDS (1UL << 1) /* Always returned, even if not requested */
#define PIDFD_INFO_CGROUPID (1UL << 2) /* Always returned if available, even if not requested */
#define PIDFD_INFO_EXIT (1UL << 3) /* Only returned if requested. */
#define PIDFD_INFO_SIZE_VER0 64 /* sizeof first published struct */
@@ -86,7 +87,7 @@ struct pidfd_info {
__u32 sgid;
__u32 fsuid;
__u32 fsgid;
__u32 spare0[1];
__s32 exit_code;
};
#define PIDFS_IOCTL_MAGIC 0xFF