/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _UAPI_LINUX_PIDFD_H #define _UAPI_LINUX_PIDFD_H #include #include #include /* 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) #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) /* * The concept of process and threads in userland and the kernel is a confusing * one - within the kernel every thread is a 'task' with its own individual PID, * however from userland's point of view threads are grouped by a single PID, * which is that of the 'thread group leader', typically the first thread * spawned. * * To cut the Gideon knot, for internal kernel usage, we refer to * PIDFD_SELF_THREAD to refer to the current thread (or task from a kernel * perspective), and PIDFD_SELF_THREAD_GROUP to refer to the current thread * group leader... */ #define PIDFD_SELF_THREAD -10000 /* Current thread. */ #define PIDFD_SELF_THREAD_GROUP -20000 /* Current thread group leader. */ /* * ...and for userland we make life simpler - PIDFD_SELF refers to the current * thread, PIDFD_SELF_PROCESS refers to the process thread group leader. * * For nearly all practical uses, a user will want to use PIDFD_SELF. */ #define PIDFD_SELF PIDFD_SELF_THREAD #define PIDFD_SELF_PROCESS PIDFD_SELF_THREAD_GROUP #endif /* _UAPI_LINUX_PIDFD_H */