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fcntl-linux.h
/* O_*, F_*, FD_* bit values for Linux. Copyright (C) 2001-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _FCNTL_H # error "Never use <bits/fcntl-linux.h> directly; include <fcntl.h> instead." #endif /* This file contains shared definitions between Linux architectures and is included by <bits/fcntl.h> to declare them. The various #ifndef cases allow the architecture specific file to define those values with different values. A minimal <bits/fcntl.h> contains just: struct flock {...} #ifdef __USE_LARGEFILE64 struct flock64 {...} #endif #include <bits/fcntl-linux.h> */ #ifdef __USE_GNU # include <bits/types/struct_iovec.h> #endif /* open/fcntl. */ #define O_ACCMODE 0003 #define O_RDONLY 00 #define O_WRONLY 01 #define O_RDWR 02 #ifndef O_CREAT # define O_CREAT 0100 /* Not fcntl. */ #endif #ifndef O_EXCL # define O_EXCL 0200 /* Not fcntl. */ #endif #ifndef O_NOCTTY # define O_NOCTTY 0400 /* Not fcntl. */ #endif #ifndef O_TRUNC # define O_TRUNC 01000 /* Not fcntl. */ #endif #ifndef O_APPEND # define O_APPEND 02000 #endif #ifndef O_NONBLOCK # define O_NONBLOCK 04000 #endif #ifndef O_NDELAY # define O_NDELAY O_NONBLOCK #endif #ifndef O_SYNC # define O_SYNC 04010000 #endif #define O_FSYNC O_SYNC #ifndef O_ASYNC # define O_ASYNC 020000 #endif #ifndef __O_LARGEFILE # define __O_LARGEFILE 0100000 #endif #ifndef __O_DIRECTORY # define __O_DIRECTORY 0200000 #endif #ifndef __O_NOFOLLOW # define __O_NOFOLLOW 0400000 #endif #ifndef __O_CLOEXEC # define __O_CLOEXEC 02000000 #endif #ifndef __O_DIRECT # define __O_DIRECT 040000 #endif #ifndef __O_NOATIME # define __O_NOATIME 01000000 #endif #ifndef __O_PATH # define __O_PATH 010000000 #endif #ifndef __O_DSYNC # define __O_DSYNC 010000 #endif #ifndef __O_TMPFILE # define __O_TMPFILE (020000000 | __O_DIRECTORY) #endif #ifndef F_GETLK # ifndef __USE_FILE_OFFSET64 # define F_GETLK 5 /* Get record locking info. */ # define F_SETLK 6 /* Set record locking info (non-blocking). */ # define F_SETLKW 7 /* Set record locking info (blocking). */ # else # define F_GETLK F_GETLK64 /* Get record locking info. */ # define F_SETLK F_SETLK64 /* Set record locking info (non-blocking).*/ # define F_SETLKW F_SETLKW64 /* Set record locking info (blocking). */ # endif #endif #ifndef F_GETLK64 # define F_GETLK64 12 /* Get record locking info. */ # define F_SETLK64 13 /* Set record locking info (non-blocking). */ # define F_SETLKW64 14 /* Set record locking info (blocking). */ #endif /* open file description locks. Usually record locks held by a process are released on *any* close and are not inherited across a fork. These cmd values will set locks that conflict with process-associated record locks, but are "owned" by the opened file description, not the process. This means that they are inherited across fork or clone with CLONE_FILES like BSD (flock) locks, and they are only released automatically when the last reference to the the file description against which they were acquired is put. */ #ifdef __USE_GNU # define F_OFD_GETLK 36 # define F_OFD_SETLK 37 # define F_OFD_SETLKW 38 #endif #ifdef __USE_LARGEFILE64 # define O_LARGEFILE __O_LARGEFILE #endif #ifdef __USE_XOPEN2K8 # define O_DIRECTORY __O_DIRECTORY /* Must be a directory. */ # define O_NOFOLLOW __O_NOFOLLOW /* Do not follow links. */ # define O_CLOEXEC __O_CLOEXEC /* Set close_on_exec. */ #endif #ifdef __USE_GNU # define O_DIRECT __O_DIRECT /* Direct disk access. */ # define O_NOATIME __O_NOATIME /* Do not set atime. */ # define O_PATH __O_PATH /* Resolve pathname but do not open file. */ # define O_TMPFILE __O_TMPFILE /* Atomically create nameless file. */ #endif /* For now, Linux has no separate synchronicity options for read operations. We define O_RSYNC therefore as the same as O_SYNC since this is a superset. */ #if defined __USE_POSIX199309 || defined __USE_UNIX98 # define O_DSYNC __O_DSYNC /* Synchronize data. */ # if defined __O_RSYNC # define O_RSYNC __O_RSYNC /* Synchronize read operations. */ # else # define O_RSYNC O_SYNC /* Synchronize read operations. */ # endif #endif /* Values for the second argument to `fcntl'. */ #define F_DUPFD 0 /* Duplicate file descriptor. */ #define F_GETFD 1 /* Get file descriptor flags. */ #define F_SETFD 2 /* Set file descriptor flags. */ #define F_GETFL 3 /* Get file status flags. */ #define F_SETFL 4 /* Set file status flags. */ #ifndef __F_SETOWN # define __F_SETOWN 8 # define __F_GETOWN 9 #endif #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 # define F_SETOWN __F_SETOWN /* Get owner (process receiving SIGIO). */ # define F_GETOWN __F_GETOWN /* Set owner (process receiving SIGIO). */ #endif #ifndef __F_SETSIG # define __F_SETSIG 10 /* Set number of signal to be sent. */ # define __F_GETSIG 11 /* Get number of signal to be sent. */ #endif #ifndef __F_SETOWN_EX # define __F_SETOWN_EX 15 /* Get owner (thread receiving SIGIO). */ # define __F_GETOWN_EX 16 /* Set owner (thread receiving SIGIO). */ #endif #ifdef __USE_GNU # define F_SETSIG __F_SETSIG /* Set number of signal to be sent. */ # define F_GETSIG __F_GETSIG /* Get number of signal to be sent. */ # define F_SETOWN_EX __F_SETOWN_EX /* Get owner (thread receiving SIGIO). */ # define F_GETOWN_EX __F_GETOWN_EX /* Set owner (thread receiving SIGIO). */ #endif #ifdef __USE_GNU # define F_SETLEASE 1024 /* Set a lease. */ # define F_GETLEASE 1025 /* Enquire what lease is active. */ # define F_NOTIFY 1026 /* Request notifications on a directory. */ # define F_SETPIPE_SZ 1031 /* Set pipe page size array. */ # define F_GETPIPE_SZ 1032 /* Set pipe page size array. */ # define F_ADD_SEALS 1033 /* Add seals to file. */ # define F_GET_SEALS 1034 /* Get seals for file. */ /* Set / get write life time hints. */ # define F_GET_RW_HINT 1035 # define F_SET_RW_HINT 1036 # define F_GET_FILE_RW_HINT 1037 # define F_SET_FILE_RW_HINT 1038 #endif #ifdef __USE_XOPEN2K8 # define F_DUPFD_CLOEXEC 1030 /* Duplicate file descriptor with close-on-exit set. */ #endif /* For F_[GET|SET]FD. */ #define FD_CLOEXEC 1 /* Actually anything with low bit set goes */ #ifndef F_RDLCK /* For posix fcntl() and `l_type' field of a `struct flock' for lockf(). */ # define F_RDLCK 0 /* Read lock. */ # define F_WRLCK 1 /* Write lock. */ # define F_UNLCK 2 /* Remove lock. */ #endif /* For old implementation of BSD flock. */ #ifndef F_EXLCK # define F_EXLCK 4 /* or 3 */ # define F_SHLCK 8 /* or 4 */ #endif #ifdef __USE_MISC /* Operations for BSD flock, also used by the kernel implementation. */ # define LOCK_SH 1 /* Shared lock. */ # define LOCK_EX 2 /* Exclusive lock. */ # define LOCK_NB 4 /* Or'd with one of the above to prevent blocking. */ # define LOCK_UN 8 /* Remove lock. */ #endif #ifdef __USE_GNU # define LOCK_MAND 32 /* This is a mandatory flock: */ # define LOCK_READ 64 /* ... which allows concurrent read operations. */ # define LOCK_WRITE 128 /* ... which allows concurrent write operations. */ # define LOCK_RW 192 /* ... Which allows concurrent read & write operations. */ #endif #ifdef __USE_GNU /* Types of directory notifications that may be requested with F_NOTIFY. */ # define DN_ACCESS 0x00000001 /* File accessed. */ # define DN_MODIFY 0x00000002 /* File modified. */ # define DN_CREATE 0x00000004 /* File created. */ # define DN_DELETE 0x00000008 /* File removed. */ # define DN_RENAME 0x00000010 /* File renamed. */ # define DN_ATTRIB 0x00000020 /* File changed attributes. */ # define DN_MULTISHOT 0x80000000 /* Don't remove notifier. */ #endif #ifdef __USE_GNU /* Owner types. */ enum __pid_type { F_OWNER_TID = 0, /* Kernel thread. */ F_OWNER_PID, /* Process. */ F_OWNER_PGRP, /* Process group. */ F_OWNER_GID = F_OWNER_PGRP /* Alternative, obsolete name. */ }; /* Structure to use with F_GETOWN_EX and F_SETOWN_EX. */ struct f_owner_ex { enum __pid_type type; /* Owner type of ID. */ __pid_t pid; /* ID of owner. */ }; #endif #ifdef __USE_GNU /* Types of seals. */ # define F_SEAL_SEAL 0x0001 /* Prevent further seals from being set. */ # define F_SEAL_SHRINK 0x0002 /* Prevent file from shrinking. */ # define F_SEAL_GROW 0x0004 /* Prevent file from growing. */ # define F_SEAL_WRITE 0x0008 /* Prevent writes. */ # define F_SEAL_FUTURE_WRITE 0x0010 /* Prevent future writes while mapped. */ #endif #ifdef __USE_GNU /* Hint values for F_{GET,SET}_RW_HINT. */ # define RWH_WRITE_LIFE_NOT_SET 0 # define RWF_WRITE_LIFE_NOT_SET RWH_WRITE_LIFE_NOT_SET # define RWH_WRITE_LIFE_NONE 1 # define RWH_WRITE_LIFE_SHORT 2 # define RWH_WRITE_LIFE_MEDIUM 3 # define RWH_WRITE_LIFE_LONG 4 # define RWH_WRITE_LIFE_EXTREME 5 #endif /* Define some more compatibility macros to be backward compatible with BSD systems which did not managed to hide these kernel macros. */ #ifdef __USE_MISC # define FAPPEND O_APPEND # define FFSYNC O_FSYNC # define FASYNC O_ASYNC # define FNONBLOCK O_NONBLOCK # define FNDELAY O_NDELAY #endif /* Use misc. */ #ifndef __POSIX_FADV_DONTNEED # define __POSIX_FADV_DONTNEED 4 # define __POSIX_FADV_NOREUSE 5 #endif /* Advise to `posix_fadvise'. */ #ifdef __USE_XOPEN2K # define POSIX_FADV_NORMAL 0 /* No further special treatment. */ # define POSIX_FADV_RANDOM 1 /* Expect random page references. */ # define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */ # define POSIX_FADV_WILLNEED 3 /* Will need these pages. */ # define POSIX_FADV_DONTNEED __POSIX_FADV_DONTNEED /* Don't need these pages. */ # define POSIX_FADV_NOREUSE __POSIX_FADV_NOREUSE /* Data will be accessed once. */ #endif #ifdef __USE_GNU /* Flags for SYNC_FILE_RANGE. */ # define SYNC_FILE_RANGE_WAIT_BEFORE 1 /* Wait upon writeout of all pages in the range before performing the write. */ # define SYNC_FILE_RANGE_WRITE 2 /* Initiate writeout of all those dirty pages in the range which are not presently under writeback. */ # define SYNC_FILE_RANGE_WAIT_AFTER 4 /* Wait upon writeout of all pages in the range after performing the write. */ /* SYNC_FILE_RANGE_WRITE_AND_WAIT ensures all pages in the range are written to disk before returning. */ # define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE \ | SYNC_FILE_RANGE_WAIT_BEFORE \ | SYNC_FILE_RANGE_WAIT_AFTER) /* Flags for SPLICE and VMSPLICE. */ # define SPLICE_F_MOVE 1 /* Move pages instead of copying. */ # define SPLICE_F_NONBLOCK 2 /* Don't block on the pipe splicing (but we may still block on the fd we splice from/to). */ # define SPLICE_F_MORE 4 /* Expect more data. */ # define SPLICE_F_GIFT 8 /* Pages passed in are a gift. */ /* Flags for fallocate. */ # include <linux/falloc.h> /* File handle structure. */ struct file_handle { unsigned int handle_bytes; int handle_type; /* File identifier. */ unsigned char f_handle[0]; }; /* Maximum handle size (for now). */ # define MAX_HANDLE_SZ 128 #endif __BEGIN_DECLS #ifdef __USE_GNU /* Provide kernel hint to read ahead. */ extern __ssize_t readahead (int __fd, __off64_t __offset, size_t __count) __THROW; /* Selective file content synch'ing. This function is a possible cancellation point and therefore not marked with __THROW. */ extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count, unsigned int __flags); /* Splice address range into a pipe. This function is a possible cancellation point and therefore not marked with __THROW. */ extern __ssize_t vmsplice (int __fdout, const struct iovec *__iov, size_t __count, unsigned int __flags); /* Splice two files together. This function is a possible cancellation point and therefore not marked with __THROW. */ extern __ssize_t splice (int __fdin, __off64_t *__offin, int __fdout, __off64_t *__offout, size_t __len, unsigned int __flags); /* In-kernel implementation of tee for pipe buffers. This function is a possible cancellation point and therefore not marked with __THROW. */ extern __ssize_t tee (int __fdin, int __fdout, size_t __len, unsigned int __flags); /* Reserve storage for the data of the file associated with FD. This function is a possible cancellation point and therefore not marked with __THROW. */ # ifndef __USE_FILE_OFFSET64 extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len); # else # ifdef __REDIRECT extern int __REDIRECT (fallocate, (int __fd, int __mode, __off64_t __offset, __off64_t __len), fallocate64); # else # define fallocate fallocate64 # endif # endif # ifdef __USE_LARGEFILE64 extern int fallocate64 (int __fd, int __mode, __off64_t __offset, __off64_t __len); # endif /* Map file name to file handle. */ extern int name_to_handle_at (int __dfd, const char *__name, struct file_handle *__handle, int *__mnt_id, int __flags) __THROW; /* Open file using the file handle. This function is a possible cancellation point and therefore not marked with __THROW. */ extern int open_by_handle_at (int __mountdirfd, struct file_handle *__handle, int __flags); #endif /* use GNU */ __END_DECLS
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