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36 * @(#)fcntl.h 8.3 (Berkeley) 1/21/94
44 * This file includes the definitions for open and fcntl
45 * described by POSIX for <fcntl.h>; it also includes
46 * related kernel definitions.
49 #include <sys/cdefs.h>
50 #include <sys/_types.h>
52 #ifndef _MODE_T_DECLARED
53 typedef __mode_t mode_t;
54 #define _MODE_T_DECLARED
57 #ifndef _OFF_T_DECLARED
58 typedef __off_t off_t;
59 #define _OFF_T_DECLARED
62 #ifndef _PID_T_DECLARED
63 typedef __pid_t pid_t;
64 #define _PID_T_DECLARED
68 * File status flags: these are used by open(2), fcntl(2).
69 * They are also used (indirectly) in the kernel file structure f_flags,
70 * which is a superset of the open/fcntl flags. Open flags and f_flags
71 * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
72 * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
75 #define O_RDONLY 0x0000 /* open for reading only */
76 #define O_WRONLY 0x0001 /* open for writing only */
77 #define O_RDWR 0x0002 /* open for reading and writing */
78 #define O_ACCMODE 0x0003 /* mask for above modes */
81 * Kernel encoding of open mode; separate read and write bits that are
82 * independently testable: 1 greater than the above.
85 * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
86 * which was documented to use FREAD/FWRITE, continues to work.
92 #define O_NONBLOCK 0x0004 /* no delay */
93 #define O_APPEND 0x0008 /* set append mode */
95 #define O_SHLOCK 0x0010 /* open with shared file lock */
96 #define O_EXLOCK 0x0020 /* open with exclusive file lock */
97 #define O_ASYNC 0x0040 /* signal pgrp when data ready */
98 #define O_FSYNC 0x0080 /* synchronous writes */
100 #define O_SYNC 0x0080 /* POSIX synonym for O_FSYNC */
101 #if __POSIX_VISIBLE >= 200809
102 #define O_NOFOLLOW 0x0100 /* don't follow symlinks */
104 #define O_CREAT 0x0200 /* create if nonexistent */
105 #define O_TRUNC 0x0400 /* truncate to zero length */
106 #define O_EXCL 0x0800 /* error if already exists */
108 #define FHASLOCK 0x4000 /* descriptor holds advisory lock */
111 /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */
112 #define O_NOCTTY 0x8000 /* don't assign controlling terminal */
115 /* Attempt to bypass buffer cache */
116 #define O_DIRECT 0x00010000
119 #if __POSIX_VISIBLE >= 200809
120 #define O_DIRECTORY 0x00020000 /* Fail if not directory */
121 #define O_EXEC 0x00040000 /* Open for execute only */
127 #if __POSIX_VISIBLE >= 200809
128 /* Defined by POSIX 1003.1-2008; BSD default, but reserve for future use. */
129 #define O_TTY_INIT 0x00080000 /* Restore default termios attributes */
131 #define O_CLOEXEC 0x00100000
135 #define O_VERIFY 0x00200000 /* open only after verification */
136 #define O_BENEATH 0x00400000 /* Fail if not under cwd */
140 * XXX missing O_DSYNC, O_RSYNC.
145 /* Only for devfs d_close() flags. */
146 #define FLASTCLOSE O_DIRECTORY
147 #define FREVOKE O_VERIFY
148 /* Only for fo_close() from half-succeeded open */
149 #define FOPENFAILED O_TTY_INIT
151 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
152 #define FFLAGS(oflags) ((oflags) & O_EXEC ? (oflags) : (oflags) + 1)
153 #define OFLAGS(fflags) ((fflags) & O_EXEC ? (fflags) : (fflags) - 1)
155 /* bits to save after open */
156 #define FMASK (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT|FEXEC)
157 /* bits settable by fcntl(F_SETFL, ...) */
158 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FRDAHEAD|O_DIRECT)
160 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
161 defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
163 * Set by shm_open(3) in older libc's to get automatic MAP_ASYNC
164 * behavior for POSIX shared memory objects (which are otherwise
165 * implemented as plain files).
167 #define FPOSIXSHM O_NOFOLLOW
169 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|FRDAHEAD| \
175 * The O_* flags used to have only F* names, which were used in the kernel
176 * and by fcntl. We retain the F* names for the kernel f_flag field
177 * and for backward compatibility for fcntl. These flags are deprecated.
180 #define FAPPEND O_APPEND /* kernel/compat */
181 #define FASYNC O_ASYNC /* kernel/compat */
182 #define FFSYNC O_FSYNC /* kernel */
183 #define FNONBLOCK O_NONBLOCK /* kernel */
184 #define FNDELAY O_NONBLOCK /* compat */
185 #define O_NDELAY O_NONBLOCK /* compat */
189 * We are out of bits in f_flag (which is a short). However,
190 * the flag bits not set in FMASK are only meaningful in the
191 * initial open syscall. Those bits can thus be given a
192 * different meaning for fcntl(2).
196 #define FRDAHEAD O_CREAT
199 #if __POSIX_VISIBLE >= 200809
201 * Magic value that specify the use of the current working directory
202 * to determine the target of relative file paths in the openat() and
205 #define AT_FDCWD -100
208 * Miscellaneous flags for the *at() syscalls.
210 #define AT_EACCESS 0x0100 /* Check access using effective user
212 #define AT_SYMLINK_NOFOLLOW 0x0200 /* Do not follow symbolic links */
213 #define AT_SYMLINK_FOLLOW 0x0400 /* Follow symbolic link */
214 #define AT_REMOVEDIR 0x0800 /* Remove directory instead of file */
215 #define AT_BENEATH 0x1000 /* Fail if not under dirfd */
219 * Constants used for fcntl(2)
223 #define F_DUPFD 0 /* duplicate file descriptor */
224 #define F_GETFD 1 /* get file descriptor flags */
225 #define F_SETFD 2 /* set file descriptor flags */
226 #define F_GETFL 3 /* get file status flags */
227 #define F_SETFL 4 /* set file status flags */
228 #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
229 #define F_GETOWN 5 /* get SIGIO/SIGURG proc/pgrp */
230 #define F_SETOWN 6 /* set SIGIO/SIGURG proc/pgrp */
233 #define F_OGETLK 7 /* get record locking information */
234 #define F_OSETLK 8 /* set record locking information */
235 #define F_OSETLKW 9 /* F_SETLK; wait if blocked */
236 #define F_DUP2FD 10 /* duplicate file descriptor to arg */
238 #define F_GETLK 11 /* get record locking information */
239 #define F_SETLK 12 /* set record locking information */
240 #define F_SETLKW 13 /* F_SETLK; wait if blocked */
242 #define F_SETLK_REMOTE 14 /* debugging support for remote locks */
243 #define F_READAHEAD 15 /* read ahead */
244 #define F_RDAHEAD 16 /* Darwin compatible read ahead */
246 #if __POSIX_VISIBLE >= 200809
247 #define F_DUPFD_CLOEXEC 17 /* Like F_DUPFD, but FD_CLOEXEC is set */
250 #define F_DUP2FD_CLOEXEC 18 /* Like F_DUP2FD, but FD_CLOEXEC is set */
253 /* file descriptor flags (F_GETFD, F_SETFD) */
254 #define FD_CLOEXEC 1 /* close-on-exec flag */
256 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
257 #define F_RDLCK 1 /* shared or read lock */
258 #define F_UNLCK 2 /* unlock */
259 #define F_WRLCK 3 /* exclusive or write lock */
261 #define F_UNLCKSYS 4 /* purge locks for a given system ID */
262 #define F_CANCEL 5 /* cancel an async lock request */
265 #define F_WAIT 0x010 /* Wait until lock is granted */
266 #define F_FLOCK 0x020 /* Use flock(2) semantics for lock */
267 #define F_POSIX 0x040 /* Use POSIX semantics for lock */
268 #define F_REMOTE 0x080 /* Lock owner is remote NFS client */
269 #define F_NOINTR 0x100 /* Ignore signals when waiting */
273 * Advisory file segment locking data type -
274 * information passed to system by user
277 off_t l_start; /* starting offset */
278 off_t l_len; /* len = 0 means until end of file */
279 pid_t l_pid; /* lock owner */
280 short l_type; /* lock type: read/write, etc. */
281 short l_whence; /* type of l_start */
282 int l_sysid; /* remote system id or zero for local */
287 * Old advisory file segment locking data type,
288 * before adding l_sysid.
291 off_t l_start; /* starting offset */
292 off_t l_len; /* len = 0 means until end of file */
293 pid_t l_pid; /* lock owner */
294 short l_type; /* lock type: read/write, etc. */
295 short l_whence; /* type of l_start */
300 /* lock operations for flock(2) */
301 #define LOCK_SH 0x01 /* shared file lock */
302 #define LOCK_EX 0x02 /* exclusive file lock */
303 #define LOCK_NB 0x04 /* don't block when locking */
304 #define LOCK_UN 0x08 /* unlock file */
307 #if __POSIX_VISIBLE >= 200112
309 * Advice to posix_fadvise
311 #define POSIX_FADV_NORMAL 0 /* no special treatment */
312 #define POSIX_FADV_RANDOM 1 /* expect random page references */
313 #define POSIX_FADV_SEQUENTIAL 2 /* expect sequential page references */
314 #define POSIX_FADV_WILLNEED 3 /* will need these pages */
315 #define POSIX_FADV_DONTNEED 4 /* dont need these pages */
316 #define POSIX_FADV_NOREUSE 5 /* access data only once */
322 * Magic value that specify that corresponding file descriptor to filename
323 * is unknown and sanitary check should be omitted in the funlinkat() and
331 int open(const char *, int, ...);
332 int creat(const char *, mode_t);
333 int fcntl(int, int, ...);
337 #if __POSIX_VISIBLE >= 200809
338 int openat(int, const char *, int, ...);
340 #if __POSIX_VISIBLE >= 200112
341 int posix_fadvise(int, off_t, off_t, int);
342 int posix_fallocate(int, off_t, off_t);
347 #endif /* !_SYS_FCNTL_H_ */