pidfd.h (3092B) - Raw
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 3 #ifndef _LINUX_PIDFD_H 4 #define _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 /* _LINUX_PIDFD_H */