1 /* O_*, F_*, FD_* bit values. 4.4BSD/Generic version. 2 Copyright (C) 1991-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _FCNTL_H 20 #error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead." 21 #endif 22 23 24 /* File access modes for `open' and `fcntl'. */ 25 #define O_RDONLY 0 /* Open read-only. */ 26 #define O_WRONLY 1 /* Open write-only. */ 27 #define O_RDWR 2 /* Open read/write. */ 28 29 30 /* Bits OR'd into the second argument to open. */ 31 #define O_CREAT 0x0200 /* Create file if it doesn't exist. */ 32 #define O_EXCL 0x0800 /* Fail if file already exists. */ 33 #define O_TRUNC 0x0400 /* Truncate file to zero length. */ 34 #define O_NOCTTY 0x8000 /* Don't assign a controlling terminal. */ 35 #define O_ASYNC 0x0040 /* Send SIGIO to owner when data is ready. */ 36 #define O_FSYNC 0x0080 /* Synchronous writes. */ 37 #define O_SYNC O_FSYNC 38 #ifdef __USE_MISC 39 #define O_SHLOCK 0x0010 /* Open with shared file lock. */ 40 #define O_EXLOCK 0x0020 /* Open with shared exclusive lock. */ 41 #endif 42 #ifdef __USE_XOPEN2K8 43 # define O_DIRECTORY 0x00200000 /* Must be a directory. */ 44 # define O_NOFOLLOW 0x00000100 /* Do not follow links. */ 45 # define O_CLOEXEC 0x00400000 /* Set close_on_exec. */ 46 #endif 47 #if defined __USE_POSIX199309 || defined __USE_UNIX98 48 # define O_DSYNC 0x00010000 /* Synchronize data. */ 49 # define O_RSYNC 0x00020000 /* Synchronize read operations. */ 50 #endif 51 52 /* All opens support large file sizes, so there is no flag bit for this. */ 53 #ifdef __USE_LARGEFILE64 54 # define O_LARGEFILE 0 55 #endif 56 57 /* File status flags for `open' and `fcntl'. */ 58 #define O_APPEND 0x0008 /* Writes append to the file. */ 59 #define O_NONBLOCK 0x0004 /* Non-blocking I/O. */ 60 61 #ifdef __USE_MISC 62 # define O_NDELAY O_NONBLOCK 63 #endif 64 65 #ifdef __USE_MISC 66 /* Flags for TIOCFLUSH. */ 67 # define FREAD 1 68 # define FWRITE 2 69 70 /* Traditional BSD names the O_* bits. */ 71 # define FASYNC O_ASYNC 72 # define FFSYNC O_FSYNC 73 # define FSYNC O_SYNC 74 # define FAPPEND O_APPEND 75 # define FNDELAY O_NDELAY 76 #endif 77 78 /* Mask for file access modes. This is system-dependent in case 79 some system ever wants to define some other flavor of access. */ 80 #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) 81 82 /* Values for the second argument to `fcntl'. */ 83 #define F_DUPFD 0 /* Duplicate file descriptor. */ 84 #define F_GETFD 1 /* Get file descriptor flags. */ 85 #define F_SETFD 2 /* Set file descriptor flags. */ 86 #define F_GETFL 3 /* Get file status flags. */ 87 #define F_SETFL 4 /* Set file status flags. */ 88 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 89 #define F_GETOWN 5 /* Get owner (receiver of SIGIO). */ 90 #define F_SETOWN 6 /* Set owner (receiver of SIGIO). */ 91 #endif 92 #define F_GETLK 7 /* Get record locking info. */ 93 #define F_SETLK 8 /* Set record locking info (non-blocking). */ 94 #define F_SETLKW 9 /* Set record locking info (blocking). */ 95 /* Not necessary, we always have 64-bit offsets. */ 96 #define F_GETLK64 F_GETLK /* Get record locking info. */ 97 #define F_SETLK64 F_SETLK /* Set record locking info (non-blocking). */ 98 #define F_SETLKW64 F_SETLKW/* Set record locking info (blocking). */ 99 #ifdef __USE_XOPEN2K8 100 # define F_DUPFD_CLOEXEC 12 /* Duplicate file descriptor with 101 close-on-exit set. */ 102 #endif 103 104 /* File descriptor flags used with F_GETFD and F_SETFD. */ 105 #define FD_CLOEXEC 1 /* Close on exec. */ 106 107 108 #include <bits/types.h> 109 110 /* The structure describing an advisory lock. This is the type of the third 111 argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */ 112 struct flock 113 { 114 __off_t l_start; /* Offset where the lock begins. */ 115 __off_t l_len; /* Size of the locked area; zero means until EOF. */ 116 __pid_t l_pid; /* Process holding the lock. */ 117 short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */ 118 short int l_whence; /* Where `l_start' is relative to (like `lseek'). */ 119 }; 120 121 #ifdef __USE_LARGEFILE64 122 /* Note this matches struct flock exactly. */ 123 struct flock64 124 { 125 __off_t l_start; /* Offset where the lock begins. */ 126 __off_t l_len; /* Size of the locked area; zero means until EOF. */ 127 __pid_t l_pid; /* Process holding the lock. */ 128 short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */ 129 short int l_whence; /* Where `l_start' is relative to (like `lseek'). */ 130 }; 131 #endif 132 133 /* Values for the `l_type' field of a `struct flock'. */ 134 #define F_RDLCK 1 /* Read lock. */ 135 #define F_WRLCK 2 /* Write lock. */ 136 #define F_UNLCK 3 /* Remove lock. */ 137 138 /* Advise to `posix_fadvise'. */ 139 #ifdef __USE_XOPEN2K 140 # define POSIX_FADV_NORMAL 0 /* No further special treatment. */ 141 # define POSIX_FADV_RANDOM 1 /* Expect random page references. */ 142 # define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */ 143 # define POSIX_FADV_WILLNEED 3 /* Will need these pages. */ 144 # define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */ 145 # define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */ 146 #endif 147