1 const F_LINUX_SPECIFIC_BASE: u32 = 1024; 2 3 /// fcntl syscall command 4 /// 5 /// for linux-specific fcntl commands, see: 6 /// https://code.dragonos.org.cn/xref/linux-5.19.10/tools/include/uapi/linux/fcntl.h#8 7 #[derive(Debug, Copy, Clone, Eq, PartialEq, FromPrimitive, ToPrimitive)] 8 #[repr(u32)] 9 pub enum FcntlCommand { 10 /// dup 11 DupFd = 0, 12 /// get close-on-exec 13 GetFd = 1, 14 /// set/clear close-on-exec 15 SetFd = 2, 16 /// get file flags 17 GetFlags = 3, 18 /// set file flags 19 SetFlags = 4, 20 /// get record locking info 21 GetLock = 5, 22 /// set record locking info (non-blocking) 23 SetLock = 6, 24 /// set record locking info (blocking) 25 SetLockWait = 7, 26 27 SetLease = F_LINUX_SPECIFIC_BASE + 0, 28 GetLease = F_LINUX_SPECIFIC_BASE + 1, 29 30 /// Request nofications on a directory. 31 /// See below for events that may be notified. 32 Notify = F_LINUX_SPECIFIC_BASE + 2, 33 34 /// Cancel a blocking posix lock; internal use only until we expose an 35 /// asynchronous lock api to userspace 36 CancelLock = F_LINUX_SPECIFIC_BASE + 5, 37 /// Create a file descriptor with FD_CLOEXEC set. 38 DupFdCloexec = F_LINUX_SPECIFIC_BASE + 6, 39 40 /// Set pipe page size array 41 SetPipeSize = F_LINUX_SPECIFIC_BASE + 7, 42 /// Get pipe page size array 43 GetPipeSize = F_LINUX_SPECIFIC_BASE + 8, 44 45 /// Set seals 46 AddSeals = F_LINUX_SPECIFIC_BASE + 9, 47 /// Get seals 48 GetSeals = F_LINUX_SPECIFIC_BASE + 10, 49 50 /** 51 * Set/Get write life time hints. {GET,SET}_RW_HINT operate on the 52 * underlying inode, while {GET,SET}_FILE_RW_HINT operate only on 53 * the specific file. 54 */ 55 GetRwHint = F_LINUX_SPECIFIC_BASE + 11, 56 SetRwHint = F_LINUX_SPECIFIC_BASE + 12, 57 GetFileRwHint = F_LINUX_SPECIFIC_BASE + 13, 58 SetFileRwHint = F_LINUX_SPECIFIC_BASE + 14, 59 } 60 61 bitflags! { 62 63 /// The constants AT_REMOVEDIR and AT_EACCESS have the same value. AT_EACCESS is 64 /// meaningful only to faccessat, while AT_REMOVEDIR is meaningful only to 65 /// unlinkat. The two functions do completely different things and therefore, 66 /// the flags can be allowed to overlap. For example, passing AT_REMOVEDIR to 67 /// faccessat would be undefined behavior and thus treating it equivalent to 68 /// AT_EACCESS is valid undefined behavior. 69 pub struct AtFlags: i32 { 70 /// 特殊值，用于指示openat应使用当前工作目录。 71 const AT_FDCWD = -100; 72 /// 不要跟随符号链接。 73 const AT_SYMLINK_NOFOLLOW = 0x100; 74 /// AtEAccess: 使用有效ID进行访问测试，而不是实际ID。 75 const AT_EACCESS = 0x200; 76 /// AtRemoveDir: 删除目录而不是取消链接文件。 77 const AT_REMOVEDIR = 0x200; 78 79 /// 跟随符号链接。 80 /// AT_SYMLINK_FOLLOW: 0x400 81 const AT_SYMLINK_FOLLOW = 0x400; 82 /// 禁止终端自动挂载遍历。 83 /// AT_NO_AUTOMOUNT: 0x800 84 const AT_NO_AUTOMOUNT = 0x800; 85 /// 允许空的相对路径名。 86 /// AT_EMPTY_PATH: 0x1000 87 const AT_EMPTY_PATH = 0x1000; 88 /// statx()所需的同步类型。 89 /// AT_STATX_SYNC_TYPE: 0x6000 90 const AT_STATX_SYNC_TYPE = 0x6000; 91 /// 执行与stat()相同的操作。 92 /// AT_STATX_SYNC_AS_STAT: 0x0000 93 const AT_STATX_SYNC_AS_STAT = 0x0000; 94 /// 强制将属性与服务器同步。 95 /// AT_STATX_FORCE_SYNC: 0x2000 96 const AT_STATX_FORCE_SYNC = 0x2000; 97 /// 不要将属性与服务器同步。 98 /// AT_STATX_DONT_SYNC: 0x4000 99 const AT_STATX_DONT_SYNC = 0x4000; 100 /// 应用于整个子树。 101 /// AT_RECURSIVE: 0x8000 102 const AT_RECURSIVE = 0x8000; 103 } 104 } 105 106 /// for F_[GET|SET]FL 107 pub const FD_CLOEXEC: u32 = 1; 108