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34 * @(#)fcntl.h 8.3 (Berkeley) 1/21/94
42 * This file includes the definitions for open and fcntl
43 * described by POSIX for <fcntl.h>; it also includes
44 * related kernel definitions.
47 #include <sys/cdefs.h>
48 #include <sys/_types.h>
50 #ifndef _MODE_T_DECLARED
51 typedef __mode_t mode_t;
52 #define _MODE_T_DECLARED
55 #ifndef _OFF_T_DECLARED
56 typedef __off_t off_t;
57 #define _OFF_T_DECLARED
60 #ifndef _PID_T_DECLARED
61 typedef __pid_t pid_t;
62 #define _PID_T_DECLARED
66 * File status flags: these are used by open(2), fcntl(2).
67 * They are also used (indirectly) in the kernel file structure f_flags,
68 * which is a superset of the open/fcntl flags. Open flags and f_flags
69 * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
70 * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
73 #define O_RDONLY 0x0000 /* open for reading only */
74 #define O_WRONLY 0x0001 /* open for writing only */
75 #define O_RDWR 0x0002 /* open for reading and writing */
76 #define O_ACCMODE 0x0003 /* mask for above modes */
79 * Kernel encoding of open mode; separate read and write bits that are
80 * independently testable: 1 greater than the above.
83 * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
84 * which was documented to use FREAD/FWRITE, continues to work.
90 #define O_NONBLOCK 0x0004 /* no delay */
91 #define O_APPEND 0x0008 /* set append mode */
93 #define O_SHLOCK 0x0010 /* open with shared file lock */
94 #define O_EXLOCK 0x0020 /* open with exclusive file lock */
95 #define O_ASYNC 0x0040 /* signal pgrp when data ready */
96 #define O_FSYNC 0x0080 /* synchronous writes */
98 #define O_SYNC 0x0080 /* POSIX synonym for O_FSYNC */
100 #define O_NOFOLLOW 0x0100 /* don't follow symlinks */
102 #define O_CREAT 0x0200 /* create if nonexistent */
103 #define O_TRUNC 0x0400 /* truncate to zero length */
104 #define O_EXCL 0x0800 /* error if already exists */
106 #define FHASLOCK 0x4000 /* descriptor holds advisory lock */
109 /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */
110 #define O_NOCTTY 0x8000 /* don't assign controlling terminal */
113 /* Attempt to bypass buffer cache */
114 #define O_DIRECT 0x00010000
117 /* Defined by POSIX Extended API Set Part 2 */
119 #define O_DIRECTORY 0x00020000 /* Fail if not directory */
120 #define O_EXEC 0x00040000 /* Open for execute only */
126 #if __POSIX_VISIBLE >= 200809
127 /* Defined by POSIX 1003.1-2008; BSD default, but reserve for future use. */
128 #define O_TTY_INIT 0x00080000 /* Restore default termios attributes */
130 #define O_CLOEXEC 0x00100000
134 * XXX missing O_DSYNC, O_RSYNC.
138 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
139 #define FFLAGS(oflags) ((oflags) + 1)
140 #define OFLAGS(fflags) ((fflags) - 1)
142 /* bits to save after open */
143 #define FMASK (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT|FEXEC)
144 /* bits settable by fcntl(F_SETFL, ...) */
145 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FRDAHEAD|O_DIRECT)
147 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
148 defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
150 * Set by shm_open(3) in older libc's to get automatic MAP_ASYNC
151 * behavior for POSIX shared memory objects (which are otherwise
152 * implemented as plain files).
154 #define FPOSIXSHM O_NOFOLLOW
156 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|FRDAHEAD| \
162 * The O_* flags used to have only F* names, which were used in the kernel
163 * and by fcntl. We retain the F* names for the kernel f_flag field
164 * and for backward compatibility for fcntl. These flags are deprecated.
167 #define FAPPEND O_APPEND /* kernel/compat */
168 #define FASYNC O_ASYNC /* kernel/compat */
169 #define FFSYNC O_FSYNC /* kernel */
170 #define FNONBLOCK O_NONBLOCK /* kernel */
171 #define FNDELAY O_NONBLOCK /* compat */
172 #define O_NDELAY O_NONBLOCK /* compat */
176 * We are out of bits in f_flag (which is a short). However,
177 * the flag bits not set in FMASK are only meaningful in the
178 * initial open syscall. Those bits can thus be given a
179 * different meaning for fcntl(2).
183 #define FRDAHEAD O_CREAT
186 /* Defined by POSIX Extended API Set Part 2 */
189 * Magic value that specify the use of the current working directory
190 * to determine the target of relative file paths in the openat() and
193 #define AT_FDCWD -100
196 * Miscellaneous flags for the *at() syscalls.
198 #define AT_EACCESS 0x100 /* Check access using effective user and group ID */
199 #define AT_SYMLINK_NOFOLLOW 0x200 /* Do not follow symbolic links */
200 #define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic link */
201 #define AT_REMOVEDIR 0x800 /* Remove directory instead of file */
205 * Constants used for fcntl(2)
209 #define F_DUPFD 0 /* duplicate file descriptor */
210 #define F_GETFD 1 /* get file descriptor flags */
211 #define F_SETFD 2 /* set file descriptor flags */
212 #define F_GETFL 3 /* get file status flags */
213 #define F_SETFL 4 /* set file status flags */
214 #if __BSD_VISIBLE || __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
215 #define F_GETOWN 5 /* get SIGIO/SIGURG proc/pgrp */
216 #define F_SETOWN 6 /* set SIGIO/SIGURG proc/pgrp */
218 #define F_OGETLK 7 /* get record locking information */
219 #define F_OSETLK 8 /* set record locking information */
220 #define F_OSETLKW 9 /* F_SETLK; wait if blocked */
221 #define F_DUP2FD 10 /* duplicate file descriptor to arg */
222 #define F_GETLK 11 /* get record locking information */
223 #define F_SETLK 12 /* set record locking information */
224 #define F_SETLKW 13 /* F_SETLK; wait if blocked */
225 #define F_SETLK_REMOTE 14 /* debugging support for remote locks */
226 #define F_READAHEAD 15 /* read ahead */
227 #define F_RDAHEAD 16 /* Darwin compatible read ahead */
229 /* file descriptor flags (F_GETFD, F_SETFD) */
230 #define FD_CLOEXEC 1 /* close-on-exec flag */
232 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
233 #define F_RDLCK 1 /* shared or read lock */
234 #define F_UNLCK 2 /* unlock */
235 #define F_WRLCK 3 /* exclusive or write lock */
236 #define F_UNLCKSYS 4 /* purge locks for a given system ID */
237 #define F_CANCEL 5 /* cancel an async lock request */
239 #define F_WAIT 0x010 /* Wait until lock is granted */
240 #define F_FLOCK 0x020 /* Use flock(2) semantics for lock */
241 #define F_POSIX 0x040 /* Use POSIX semantics for lock */
242 #define F_REMOTE 0x080 /* Lock owner is remote NFS client */
243 #define F_NOINTR 0x100 /* Ignore signals when waiting */
247 * Advisory file segment locking data type -
248 * information passed to system by user
251 off_t l_start; /* starting offset */
252 off_t l_len; /* len = 0 means until end of file */
253 pid_t l_pid; /* lock owner */
254 short l_type; /* lock type: read/write, etc. */
255 short l_whence; /* type of l_start */
256 int l_sysid; /* remote system id or zero for local */
260 * Old advisory file segment locking data type,
261 * before adding l_sysid.
264 off_t l_start; /* starting offset */
265 off_t l_len; /* len = 0 means until end of file */
266 pid_t l_pid; /* lock owner */
267 short l_type; /* lock type: read/write, etc. */
268 short l_whence; /* type of l_start */
273 /* lock operations for flock(2) */
274 #define LOCK_SH 0x01 /* shared file lock */
275 #define LOCK_EX 0x02 /* exclusive file lock */
276 #define LOCK_NB 0x04 /* don't block when locking */
277 #define LOCK_UN 0x08 /* unlock file */
281 * XXX missing posix_fadvise() and POSIX_FADV_* macros.
286 int open(const char *, int, ...);
287 int creat(const char *, mode_t);
288 int fcntl(int, int, ...);
289 #if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809
290 int openat(int, const char *, int, ...);
292 #if __BSD_VISIBLE || __POSIX_VISIBLE >= 200112
293 int posix_fallocate(int, off_t, off_t);
301 #endif /* !_SYS_FCNTL_H_ */