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 * These cannot be used by userspace O_* until internal and external open 10 * flags are split. 11 * -Eric Paris 12 */ 13 14 /* 15 * When introducing new O_* bits, please check its uniqueness in fcntl_init(). 16 */ 17 18 #define O_ACCMODE 3 19 #define O_RDONLY 0 20 #define O_WRONLY (1 << 0) 21 #define O_RDWR (1 << 1) 22 /* (1 << 2) must not be used -- it collides with flags on alpha, sparc */ 23 /* (1 << 3) must not be used -- it collides with flags on alpha, mips, parisc, sparc */ 24 /* (1 << 4) must not be used -- it collides with flags on mips */ 25 /* (1 << 5) is free */ 26 #ifndef O_CREAT 27 #define O_CREAT (1 << 6) /* not fcntl */ 28 #endif 29 #ifndef O_EXCL 30 #define O_EXCL (1 << 7) /* not fcntl */ 31 #endif 32 #ifndef O_NOCTTY 33 #define O_NOCTTY (1 << 8) /* not fcntl */ 34 #endif 35 #ifndef O_TRUNC 36 #define O_TRUNC (1 << 9) /* not fcntl */ 37 #endif 38 #ifndef O_APPEND 39 #define O_APPEND (1 << 10) 40 #endif 41 #ifndef O_NONBLOCK 42 #define O_NONBLOCK (1 << 11) 43 #endif 44 #ifndef O_DSYNC 45 #define O_DSYNC (1 << 12) /* used to be O_SYNC, see below */ 46 #endif 47 #ifndef FASYNC 48 #define FASYNC (1 << 13) /* fcntl, for BSD compatibility */ 49 #endif 50 #ifndef O_DIRECT 51 #define O_DIRECT (1 << 14) /* direct disk access hint */ 52 #endif 53 #ifndef O_LARGEFILE 54 #define O_LARGEFILE (1 << 15) 55 #endif 56 #ifndef O_DIRECTORY 57 #define O_DIRECTORY (1 << 16) /* must be a directory */ 58 #endif 59 #ifndef O_NOFOLLOW 60 #define O_NOFOLLOW (1 << 17) /* don't follow links */ 61 #endif 62 #ifndef O_NOATIME 63 #define O_NOATIME (1 << 18) 64 #endif 65 #ifndef O_CLOEXEC 66 #define O_CLOEXEC (1 << 19) /* set close_on_exec */ 67 #endif 68 69 /* 70 * Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using 71 * the O_SYNC flag. We continue to use the existing numerical value 72 * for O_DSYNC semantics now, but using the correct symbolic name for it. 73 * This new value is used to request true Posix O_SYNC semantics. It is 74 * defined in this strange way to make sure applications compiled against 75 * new headers get at least O_DSYNC semantics on older kernels. 76 * 77 * This has the nice side-effect that we can simply test for O_DSYNC 78 * wherever we do not care if O_DSYNC or O_SYNC is used. 79 * 80 * Note: __O_SYNC must never be used directly. 81 */ 82 #ifndef O_SYNC 83 #define __O_SYNC (1 << 20) 84 #define O_SYNC (__O_SYNC|O_DSYNC) 85 #endif 86 87 #ifndef O_PATH 88 #define O_PATH (1 << 21) 89 #endif 90 91 #ifndef __O_TMPFILE 92 #define __O_TMPFILE (1 << 22) 93 #endif 94 95 #ifndef O_EMPTYPATH 96 #define O_EMPTYPATH (1 << 26) /* allow empty path */ 97 #endif 98 99 /* a horrid kludge trying to make sure that this will fail on old kernels */ 100 #define O_TMPFILE (__O_TMPFILE | O_DIRECTORY) 101 102 #ifndef O_NDELAY 103 #define O_NDELAY O_NONBLOCK 104 #endif 105 106 /* (1 << 23) must not be used -- it collides with flags on alpha, parisc, sparc */ 107 /* (1 << 24) must not be used -- it collides with flags on alpha, sparc */ 108 /* (1 << 25) must not be used -- it collides with flags on sparc */ 109 110 #define F_DUPFD 0 /* dup */ 111 #define F_GETFD 1 /* get close_on_exec */ 112 #define F_SETFD 2 /* set/clear close_on_exec */ 113 #define F_GETFL 3 /* get file->f_flags */ 114 #define F_SETFL 4 /* set file->f_flags */ 115 #ifndef F_GETLK 116 #define F_GETLK 5 117 #define F_SETLK 6 118 #define F_SETLKW 7 119 #endif 120 #ifndef F_SETOWN 121 #define F_SETOWN 8 /* for sockets. */ 122 #define F_GETOWN 9 /* for sockets. */ 123 #endif 124 #ifndef F_SETSIG 125 #define F_SETSIG 10 /* for sockets. */ 126 #define F_GETSIG 11 /* for sockets. */ 127 #endif 128 129 #if __BITS_PER_LONG == 32 || defined(__KERNEL__) 130 #ifndef F_GETLK64 131 #define F_GETLK64 12 /* using 'struct flock64' */ 132 #define F_SETLK64 13 133 #define F_SETLKW64 14 134 #endif 135 #endif /* __BITS_PER_LONG == 32 || defined(__KERNEL__) */ 136 137 #ifndef F_SETOWN_EX 138 #define F_SETOWN_EX 15 139 #define F_GETOWN_EX 16 140 #endif 141 142 #ifndef F_GETOWNER_UIDS 143 #define F_GETOWNER_UIDS 17 144 #endif 145 146 /* 147 * Open File Description Locks 148 * 149 * Usually record locks held by a process are released on *any* close and are 150 * not inherited across a fork(). 151 * 152 * These cmd values will set locks that conflict with process-associated 153 * record locks, but are "owned" by the open file description, not the 154 * process. This means that they are inherited across fork() like BSD (flock) 155 * locks, and they are only released automatically when the last reference to 156 * the the open file against which they were acquired is put. 157 */ 158 #define F_OFD_GETLK 36 159 #define F_OFD_SETLK 37 160 #define F_OFD_SETLKW 38 161 162 #define F_OWNER_TID 0 163 #define F_OWNER_PID 1 164 #define F_OWNER_PGRP 2 165 166 struct f_owner_ex { 167 int type; 168 __kernel_pid_t pid; 169 }; 170 171 /* for F_[GET|SET]FL */ 172 #define FD_CLOEXEC 1 /* actually anything with low bit set goes */ 173 174 /* for posix fcntl() and lockf() */ 175 #ifndef F_RDLCK 176 #define F_RDLCK 0 177 #define F_WRLCK 1 178 #define F_UNLCK 2 179 #endif 180 181 /* for old implementation of bsd flock () */ 182 #ifndef F_EXLCK 183 #define F_EXLCK 4 /* or 3 */ 184 #define F_SHLCK 8 /* or 4 */ 185 #endif 186 187 /* operations for bsd flock(), also used by the kernel implementation */ 188 #define LOCK_SH 1 /* shared lock */ 189 #define LOCK_EX 2 /* exclusive lock */ 190 #define LOCK_NB 4 /* or'd with one of the above to prevent 191 blocking */ 192 #define LOCK_UN 8 /* remove lock */ 193 194 /* 195 * LOCK_MAND support has been removed from the kernel. We leave the symbols 196 * here to not break legacy builds, but these should not be used in new code. 197 */ 198 #define LOCK_MAND 32 /* This is a mandatory flock ... */ 199 #define LOCK_READ 64 /* which allows concurrent read operations */ 200 #define LOCK_WRITE 128 /* which allows concurrent write operations */ 201 #define LOCK_RW 192 /* which allows concurrent read & write ops */ 202 203 #define F_LINUX_SPECIFIC_BASE 1024 204 205 #ifndef HAVE_ARCH_STRUCT_FLOCK 206 struct flock { 207 short l_type; 208 short l_whence; 209 __kernel_off_t l_start; 210 __kernel_off_t l_len; 211 __kernel_pid_t l_pid; 212 #ifdef __ARCH_FLOCK_EXTRA_SYSID 213 __ARCH_FLOCK_EXTRA_SYSID 214 #endif 215 #ifdef __ARCH_FLOCK_PAD 216 __ARCH_FLOCK_PAD 217 #endif 218 }; 219 220 struct flock64 { 221 short l_type; 222 short l_whence; 223 __kernel_loff_t l_start; 224 __kernel_loff_t l_len; 225 __kernel_pid_t l_pid; 226 #ifdef __ARCH_FLOCK64_PAD 227 __ARCH_FLOCK64_PAD 228 #endif 229 }; 230 #endif /* HAVE_ARCH_STRUCT_FLOCK */ 231 232 #endif /* _ASM_GENERIC_FCNTL_H */ 233