include/uapi/linux/pidfd.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2
   3 #ifndef _UAPI_LINUX_PIDFD_H
   4 #define _UAPI_LINUX_PIDFD_H
   5
   6 #include <linux/types.h>
   7 #include <linux/fcntl.h>
   8 #include <linux/ioctl.h>
   9
  10 /* Flags for pidfd_open().  */
  11 #define PIDFD_NONBLOCK  O_NONBLOCK
  12 #define PIDFD_THREAD    O_EXCL
  13
  14 /* Flags for pidfd_send_signal(). */
  15 #define PIDFD_SIGNAL_THREAD             (1UL << 0)
  16 #define PIDFD_SIGNAL_THREAD_GROUP       (1UL << 1)
  17 #define PIDFD_SIGNAL_PROCESS_GROUP      (1UL << 2)
  18
  19 /* Flags for pidfd_info. */
  20 #define PIDFD_INFO_PID                  (1UL << 0) /* Always returned, even if not requested */
  21 #define PIDFD_INFO_CREDS                (1UL << 1) /* Always returned, even if not requested */
  22 #define PIDFD_INFO_CGROUPID             (1UL << 2) /* Always returned if available, even if not requested */
  23
  24 #define PIDFD_INFO_SIZE_VER0            64 /* sizeof first published struct */
  25
  26 struct pidfd_info {
  27         /*
  28          * This mask is similar to the request_mask in statx(2).
  29          *
  30          * Userspace indicates what extensions or expensive-to-calculate fields
  31          * they want by setting the corresponding bits in mask. The kernel
  32          * will ignore bits that it does not know about.
  33          *
  34          * When filling the structure, the kernel will only set bits
  35          * corresponding to the fields that were actually filled by the kernel.
  36          * This also includes any future extensions that might be automatically
  37          * filled. If the structure size is too small to contain a field
  38          * (requested or not), to avoid confusion the mask will not
  39          * contain a bit for that field.
  40          *
  41          * As such, userspace MUST verify that mask contains the
  42          * corresponding flags after the ioctl(2) returns to ensure that it is
  43          * using valid data.
  44          */
  45         __u64 mask;
  46         /*
  47          * The information contained in the following fields might be stale at the
  48          * time it is received, as the target process might have exited as soon as
  49          * the IOCTL was processed, and there is no way to avoid that. However, it
  50          * is guaranteed that if the call was successful, then the information was
  51          * correct and referred to the intended process at the time the work was
  52          * performed. */
  53         __u64 cgroupid;
  54         __u32 pid;
  55         __u32 tgid;
  56         __u32 ppid;
  57         __u32 ruid;
  58         __u32 rgid;
  59         __u32 euid;
  60         __u32 egid;
  61         __u32 suid;
  62         __u32 sgid;
  63         __u32 fsuid;
  64         __u32 fsgid;
  65         __u32 spare0[1];
  66 };
  67
  68 #define PIDFS_IOCTL_MAGIC 0xFF
  69
  70 #define PIDFD_GET_CGROUP_NAMESPACE            _IO(PIDFS_IOCTL_MAGIC, 1)
  71 #define PIDFD_GET_IPC_NAMESPACE               _IO(PIDFS_IOCTL_MAGIC, 2)
  72 #define PIDFD_GET_MNT_NAMESPACE               _IO(PIDFS_IOCTL_MAGIC, 3)
  73 #define PIDFD_GET_NET_NAMESPACE               _IO(PIDFS_IOCTL_MAGIC, 4)
  74 #define PIDFD_GET_PID_NAMESPACE               _IO(PIDFS_IOCTL_MAGIC, 5)
  75 #define PIDFD_GET_PID_FOR_CHILDREN_NAMESPACE  _IO(PIDFS_IOCTL_MAGIC, 6)
  76 #define PIDFD_GET_TIME_NAMESPACE              _IO(PIDFS_IOCTL_MAGIC, 7)
  77 #define PIDFD_GET_TIME_FOR_CHILDREN_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 8)
  78 #define PIDFD_GET_USER_NAMESPACE              _IO(PIDFS_IOCTL_MAGIC, 9)
  79 #define PIDFD_GET_UTS_NAMESPACE               _IO(PIDFS_IOCTL_MAGIC, 10)
  80 #define PIDFD_GET_INFO                        _IOWR(PIDFS_IOCTL_MAGIC, 11, struct pidfd_info)
  81
  82 #endif /* _UAPI_LINUX_PIDFD_H */