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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _LINUX_PIDFD_H #define _LINUX_PIDFD_H #include <linux/types.h> #include <linux/fcntl.h> #include <linux/ioctl.h> /* Flags for pidfd_open(). */ #define PIDFD_NONBLOCK O_NONBLOCK #define PIDFD_THREAD O_EXCL /* Flags for pidfd_send_signal(). */ #define PIDFD_SIGNAL_THREAD (1UL << 0) #define PIDFD_SIGNAL_THREAD_GROUP (1UL << 1) #define PIDFD_SIGNAL_PROCESS_GROUP (1UL << 2) /* Flags for pidfd_info. */ #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_SIZE_VER0 64 /* sizeof first published struct */ struct pidfd_info { /* * This mask is similar to the request_mask in statx(2). * * Userspace indicates what extensions or expensive-to-calculate fields * they want by setting the corresponding bits in mask. The kernel * will ignore bits that it does not know about. * * When filling the structure, the kernel will only set bits * corresponding to the fields that were actually filled by the kernel. * This also includes any future extensions that might be automatically * filled. If the structure size is too small to contain a field * (requested or not), to avoid confusion the mask will not * contain a bit for that field. * * As such, userspace MUST verify that mask contains the * corresponding flags after the ioctl(2) returns to ensure that it is * using valid data. */ __u64 mask; /* * The information contained in the following fields might be stale at the * time it is received, as the target process might have exited as soon as * the IOCTL was processed, and there is no way to avoid that. However, it * is guaranteed that if the call was successful, then the information was * correct and referred to the intended process at the time the work was * performed. */ __u64 cgroupid; __u32 pid; __u32 tgid; __u32 ppid; __u32 ruid; __u32 rgid; __u32 euid; __u32 egid; __u32 suid; __u32 sgid; __u32 fsuid; __u32 fsgid; __u32 spare0[1]; }; #define PIDFS_IOCTL_MAGIC 0xFF #define PIDFD_GET_CGROUP_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 1) #define PIDFD_GET_IPC_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 2) #define PIDFD_GET_MNT_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 3) #define PIDFD_GET_NET_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 4) #define PIDFD_GET_PID_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 5) #define PIDFD_GET_PID_FOR_CHILDREN_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 6) #define PIDFD_GET_TIME_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 7) #define PIDFD_GET_TIME_FOR_CHILDREN_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 8) #define PIDFD_GET_USER_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 9) #define PIDFD_GET_UTS_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 10) #define PIDFD_GET_INFO _IOWR(PIDFS_IOCTL_MAGIC, 11, struct pidfd_info) #endif /* _LINUX_PIDFD_H */