fcntl.h (5594B)
1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2#ifndef _ASM_GENERIC_FCNTL_H 3#define _ASM_GENERIC_FCNTL_H 4 5#include <linux/types.h> 6 7/* 8 * FMODE_EXEC is 0x20 9 * FMODE_NONOTIFY is 0x4000000 10 * These cannot be used by userspace O_* until internal and external open 11 * flags are split. 12 * -Eric Paris 13 */ 14 15/* 16 * When introducing new O_* bits, please check its uniqueness in fcntl_init(). 17 */ 18 19#define O_ACCMODE 00000003 20#define O_RDONLY 00000000 21#define O_WRONLY 00000001 22#define O_RDWR 00000002 23#ifndef O_CREAT 24#define O_CREAT 00000100 /* not fcntl */ 25#endif 26#ifndef O_EXCL 27#define O_EXCL 00000200 /* not fcntl */ 28#endif 29#ifndef O_NOCTTY 30#define O_NOCTTY 00000400 /* not fcntl */ 31#endif 32#ifndef O_TRUNC 33#define O_TRUNC 00001000 /* not fcntl */ 34#endif 35#ifndef O_APPEND 36#define O_APPEND 00002000 37#endif 38#ifndef O_NONBLOCK 39#define O_NONBLOCK 00004000 40#endif 41#ifndef O_DSYNC 42#define O_DSYNC 00010000 /* used to be O_SYNC, see below */ 43#endif 44#ifndef FASYNC 45#define FASYNC 00020000 /* fcntl, for BSD compatibility */ 46#endif 47#ifndef O_DIRECT 48#define O_DIRECT 00040000 /* direct disk access hint */ 49#endif 50#ifndef O_LARGEFILE 51#define O_LARGEFILE 00100000 52#endif 53#ifndef O_DIRECTORY 54#define O_DIRECTORY 00200000 /* must be a directory */ 55#endif 56#ifndef O_NOFOLLOW 57#define O_NOFOLLOW 00400000 /* don't follow links */ 58#endif 59#ifndef O_NOATIME 60#define O_NOATIME 01000000 61#endif 62#ifndef O_CLOEXEC 63#define O_CLOEXEC 02000000 /* set close_on_exec */ 64#endif 65 66/* 67 * Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using 68 * the O_SYNC flag. We continue to use the existing numerical value 69 * for O_DSYNC semantics now, but using the correct symbolic name for it. 70 * This new value is used to request true Posix O_SYNC semantics. It is 71 * defined in this strange way to make sure applications compiled against 72 * new headers get at least O_DSYNC semantics on older kernels. 73 * 74 * This has the nice side-effect that we can simply test for O_DSYNC 75 * wherever we do not care if O_DSYNC or O_SYNC is used. 76 * 77 * Note: __O_SYNC must never be used directly. 78 */ 79#ifndef O_SYNC 80#define __O_SYNC 04000000 81#define O_SYNC (__O_SYNC|O_DSYNC) 82#endif 83 84#ifndef O_PATH 85#define O_PATH 010000000 86#endif 87 88#ifndef __O_TMPFILE 89#define __O_TMPFILE 020000000 90#endif 91 92/* a horrid kludge trying to make sure that this will fail on old kernels */ 93#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY) 94#define O_TMPFILE_MASK (__O_TMPFILE | O_DIRECTORY | O_CREAT) 95 96#ifndef O_NDELAY 97#define O_NDELAY O_NONBLOCK 98#endif 99 100#define F_DUPFD 0 /* dup */ 101#define F_GETFD 1 /* get close_on_exec */ 102#define F_SETFD 2 /* set/clear close_on_exec */ 103#define F_GETFL 3 /* get file->f_flags */ 104#define F_SETFL 4 /* set file->f_flags */ 105#ifndef F_GETLK 106#define F_GETLK 5 107#define F_SETLK 6 108#define F_SETLKW 7 109#endif 110#ifndef F_SETOWN 111#define F_SETOWN 8 /* for sockets. */ 112#define F_GETOWN 9 /* for sockets. */ 113#endif 114#ifndef F_SETSIG 115#define F_SETSIG 10 /* for sockets. */ 116#define F_GETSIG 11 /* for sockets. */ 117#endif 118 119#if __BITS_PER_LONG == 32 || defined(__KERNEL__) 120#ifndef F_GETLK64 121#define F_GETLK64 12 /* using 'struct flock64' */ 122#define F_SETLK64 13 123#define F_SETLKW64 14 124#endif 125#endif /* __BITS_PER_LONG == 32 || defined(__KERNEL__) */ 126 127#ifndef F_SETOWN_EX 128#define F_SETOWN_EX 15 129#define F_GETOWN_EX 16 130#endif 131 132#ifndef F_GETOWNER_UIDS 133#define F_GETOWNER_UIDS 17 134#endif 135 136/* 137 * Open File Description Locks 138 * 139 * Usually record locks held by a process are released on *any* close and are 140 * not inherited across a fork(). 141 * 142 * These cmd values will set locks that conflict with process-associated 143 * record locks, but are "owned" by the open file description, not the 144 * process. This means that they are inherited across fork() like BSD (flock) 145 * locks, and they are only released automatically when the last reference to 146 * the the open file against which they were acquired is put. 147 */ 148#define F_OFD_GETLK 36 149#define F_OFD_SETLK 37 150#define F_OFD_SETLKW 38 151 152#define F_OWNER_TID 0 153#define F_OWNER_PID 1 154#define F_OWNER_PGRP 2 155 156struct f_owner_ex { 157 int type; 158 __kernel_pid_t pid; 159}; 160 161/* for F_[GET|SET]FL */ 162#define FD_CLOEXEC 1 /* actually anything with low bit set goes */ 163 164/* for posix fcntl() and lockf() */ 165#ifndef F_RDLCK 166#define F_RDLCK 0 167#define F_WRLCK 1 168#define F_UNLCK 2 169#endif 170 171/* for old implementation of bsd flock () */ 172#ifndef F_EXLCK 173#define F_EXLCK 4 /* or 3 */ 174#define F_SHLCK 8 /* or 4 */ 175#endif 176 177/* operations for bsd flock(), also used by the kernel implementation */ 178#define LOCK_SH 1 /* shared lock */ 179#define LOCK_EX 2 /* exclusive lock */ 180#define LOCK_NB 4 /* or'd with one of the above to prevent 181 blocking */ 182#define LOCK_UN 8 /* remove lock */ 183 184/* 185 * LOCK_MAND support has been removed from the kernel. We leave the symbols 186 * here to not break legacy builds, but these should not be used in new code. 187 */ 188#define LOCK_MAND 32 /* This is a mandatory flock ... */ 189#define LOCK_READ 64 /* which allows concurrent read operations */ 190#define LOCK_WRITE 128 /* which allows concurrent write operations */ 191#define LOCK_RW 192 /* which allows concurrent read & write ops */ 192 193#define F_LINUX_SPECIFIC_BASE 1024 194 195struct flock { 196 short l_type; 197 short l_whence; 198 __kernel_off_t l_start; 199 __kernel_off_t l_len; 200 __kernel_pid_t l_pid; 201#ifdef __ARCH_FLOCK_EXTRA_SYSID 202 __ARCH_FLOCK_EXTRA_SYSID 203#endif 204#ifdef __ARCH_FLOCK_PAD 205 __ARCH_FLOCK_PAD 206#endif 207}; 208 209struct flock64 { 210 short l_type; 211 short l_whence; 212 __kernel_loff_t l_start; 213 __kernel_loff_t l_len; 214 __kernel_pid_t l_pid; 215#ifdef __ARCH_FLOCK64_PAD 216 __ARCH_FLOCK64_PAD 217#endif 218}; 219 220#endif /* _ASM_GENERIC_FCNTL_H */