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 #ifdef __KERNEL__ 14 #include <linux/sched.h> 15 #define PIDFD_STALE CLONE_PIDFD 16 #endif 17 18 /* Flags for pidfd_send_signal(). */ 19 #define PIDFD_SIGNAL_THREAD (1UL << 0) 20 #define PIDFD_SIGNAL_THREAD_GROUP (1UL << 1) 21 #define PIDFD_SIGNAL_PROCESS_GROUP (1UL << 2) 22 23 /* Flags for pidfd_info. */ 24 #define PIDFD_INFO_PID (1UL << 0) /* Always returned, even if not requested */ 25 #define PIDFD_INFO_CREDS (1UL << 1) /* Always returned, even if not requested */ 26 #define PIDFD_INFO_CGROUPID (1UL << 2) /* Always returned if available, even if not requested */ 27 #define PIDFD_INFO_EXIT (1UL << 3) /* Only returned if requested. */ 28 #define PIDFD_INFO_COREDUMP (1UL << 4) /* Only returned if requested. */ 29 #define PIDFD_INFO_SUPPORTED_MASK (1UL << 5) /* Want/got supported mask flags */ 30 #define PIDFD_INFO_COREDUMP_SIGNAL (1UL << 6) /* Always returned if PIDFD_INFO_COREDUMP is requested. */ 31 32 #define PIDFD_INFO_SIZE_VER0 64 /* sizeof first published struct */ 33 #define PIDFD_INFO_SIZE_VER1 72 /* sizeof second published struct */ 34 #define PIDFD_INFO_SIZE_VER2 80 /* sizeof third published struct */ 35 36 /* 37 * Values for @coredump_mask in pidfd_info. 38 * Only valid if PIDFD_INFO_COREDUMP is set in @mask. 39 * 40 * Note, the @PIDFD_COREDUMP_ROOT flag indicates that the generated 41 * coredump should be treated as sensitive and access should only be 42 * granted to privileged users. 43 */ 44 #define PIDFD_COREDUMPED (1U << 0) /* Did crash and... */ 45 #define PIDFD_COREDUMP_SKIP (1U << 1) /* coredumping generation was skipped. */ 46 #define PIDFD_COREDUMP_USER (1U << 2) /* coredump was done as the user. */ 47 #define PIDFD_COREDUMP_ROOT (1U << 3) /* coredump was done as root. */ 48 49 /* 50 * ...and for userland we make life simpler - PIDFD_SELF refers to the current 51 * thread, PIDFD_SELF_PROCESS refers to the process thread group leader. 52 * 53 * For nearly all practical uses, a user will want to use PIDFD_SELF. 54 */ 55 #define PIDFD_SELF PIDFD_SELF_THREAD 56 #define PIDFD_SELF_PROCESS PIDFD_SELF_THREAD_GROUP 57 58 struct pidfd_info { 59 /* 60 * This mask is similar to the request_mask in statx(2). 61 * 62 * Userspace indicates what extensions or expensive-to-calculate fields 63 * they want by setting the corresponding bits in mask. The kernel 64 * will ignore bits that it does not know about. 65 * 66 * When filling the structure, the kernel will only set bits 67 * corresponding to the fields that were actually filled by the kernel. 68 * This also includes any future extensions that might be automatically 69 * filled. If the structure size is too small to contain a field 70 * (requested or not), to avoid confusion the mask will not 71 * contain a bit for that field. 72 * 73 * As such, userspace MUST verify that mask contains the 74 * corresponding flags after the ioctl(2) returns to ensure that it is 75 * using valid data. 76 */ 77 __u64 mask; 78 /* 79 * The information contained in the following fields might be stale at the 80 * time it is received, as the target process might have exited as soon as 81 * the IOCTL was processed, and there is no way to avoid that. However, it 82 * is guaranteed that if the call was successful, then the information was 83 * correct and referred to the intended process at the time the work was 84 * performed. */ 85 __u64 cgroupid; 86 __u32 pid; 87 __u32 tgid; 88 __u32 ppid; 89 __u32 ruid; 90 __u32 rgid; 91 __u32 euid; 92 __u32 egid; 93 __u32 suid; 94 __u32 sgid; 95 __u32 fsuid; 96 __u32 fsgid; 97 __s32 exit_code; 98 struct /* coredump info */ { 99 __u32 coredump_mask; 100 __u32 coredump_signal; 101 }; 102 __u64 supported_mask; /* Mask flags that this kernel supports */ 103 }; 104 105 #define PIDFS_IOCTL_MAGIC 0xFF 106 107 #define PIDFD_GET_CGROUP_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 1) 108 #define PIDFD_GET_IPC_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 2) 109 #define PIDFD_GET_MNT_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 3) 110 #define PIDFD_GET_NET_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 4) 111 #define PIDFD_GET_PID_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 5) 112 #define PIDFD_GET_PID_FOR_CHILDREN_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 6) 113 #define PIDFD_GET_TIME_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 7) 114 #define PIDFD_GET_TIME_FOR_CHILDREN_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 8) 115 #define PIDFD_GET_USER_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 9) 116 #define PIDFD_GET_UTS_NAMESPACE _IO(PIDFS_IOCTL_MAGIC, 10) 117 #define PIDFD_GET_INFO _IOWR(PIDFS_IOCTL_MAGIC, 11, struct pidfd_info) 118 119 #endif /* _UAPI_LINUX_PIDFD_H */ 120