POSIX File Descriptor Management option group. More...

Macros
#define	F_DUPFD ZVFS_F_DUPFD
	Duplicate a file descriptor to the lowest available descriptor >= arg.

#define	F_DUPFD_CLOEXEC ZVFS_F_DUPFD_CLOEXEC
	Duplicate a file descriptor with the close-on-exec flag set.

#define	F_GETFD ZVFS_F_GETFD
	Get file descriptor flags.

#define	F_SETFD ZVFS_F_SETFD
	Set file descriptor flags.

#define	F_GETFL ZVFS_F_GETFL
	Get file status flags and file access modes.

#define	F_SETFL ZVFS_F_SETFL
	Set file status flags.

#define	F_GETOWN ZVFS_F_GETOWN
	Get the process or process group ID that receives SIGIO/SIGURG signals.

#define	F_SETOWN ZVFS_F_SETOWN
	Set the process or process group ID that receives SIGIO/SIGURG signals.

#define	FD_CLOEXEC ZVFS_FD_CLOEXEC
	Close-on-exec flag for file descriptors.

#define	SEEK_CUR ZVFS_SEEK_CUR
	Set offset relative to current file position.

#define	SEEK_END ZVFS_SEEK_END
	Set offset relative to end of file.

#define	SEEK_SET ZVFS_SEEK_SET
	Set offset to absolute position.

#define	SEEK_CUR 1
	Seek relative to the current file offset.

#define	SEEK_END 2
	Seek relative to the end of the file.

#define	SEEK_SET 0
	Seek relative to the start of the file.

Functions
int	fcntl (int fildes, int cmd,...)
	Perform file control operations on an open file descriptor.

int	dup (int fildes)
	Duplicate an open file descriptor to the lowest available descriptor.

int	dup2 (int fildes, int fildes2)
	Duplicate an open file descriptor to a specific descriptor number.

int	ftruncate (int fildes, off_t length)
	Truncate an open file to a specified length.

off_t	lseek (int fildes, off_t offset, int whence)
	Reposition the file offset of an open file descriptor.

Detailed Description

POSIX File Descriptor Management option group.

Covers dup(), dup2(), ftruncate(), lseek(), and related file-descriptor manipulation functions.

Macro Definition Documentation

◆ F_DUPFD

#define F_DUPFD ZVFS_F_DUPFD

Duplicate a file descriptor to the lowest available descriptor >= arg.

Definition at line 34 of file fcntl.h.

◆ F_DUPFD_CLOEXEC

#define F_DUPFD_CLOEXEC ZVFS_F_DUPFD_CLOEXEC

Duplicate a file descriptor with the close-on-exec flag set.

Definition at line 37 of file fcntl.h.

◆ F_GETFD

#define F_GETFD ZVFS_F_GETFD

Get file descriptor flags.

Definition at line 40 of file fcntl.h.

◆ F_GETFL

#define F_GETFL ZVFS_F_GETFL

Get file status flags and file access modes.

Definition at line 44 of file fcntl.h.

◆ F_GETOWN

#define F_GETOWN ZVFS_F_GETOWN

Get the process or process group ID that receives SIGIO/SIGURG signals.

Definition at line 55 of file fcntl.h.

◆ F_SETFD

#define F_SETFD ZVFS_F_SETFD

Set file descriptor flags.

Definition at line 42 of file fcntl.h.

◆ F_SETFL

#define F_SETFL ZVFS_F_SETFL

Set file status flags.

Definition at line 46 of file fcntl.h.

◆ F_SETOWN

#define F_SETOWN ZVFS_F_SETOWN

Set the process or process group ID that receives SIGIO/SIGURG signals.

Definition at line 57 of file fcntl.h.

◆ FD_CLOEXEC

#define FD_CLOEXEC ZVFS_FD_CLOEXEC

Close-on-exec flag for file descriptors.

Definition at line 61 of file fcntl.h.

◆ SEEK_CUR [1/2]

#define SEEK_CUR ZVFS_SEEK_CUR

Set offset relative to current file position.

Seek relative to the current file offset.

Definition at line 75 of file fcntl.h.

◆ SEEK_CUR [2/2]

#define SEEK_CUR 1

Seek relative to the current file offset.

Definition at line 76 of file unistd.h.

◆ SEEK_END [1/2]

#define SEEK_END ZVFS_SEEK_END

Set offset relative to end of file.

Seek relative to the end of the file.

Definition at line 80 of file fcntl.h.

◆ SEEK_END [2/2]

#define SEEK_END 2

Seek relative to the end of the file.

Definition at line 81 of file unistd.h.

◆ SEEK_SET [1/2]

#define SEEK_SET ZVFS_SEEK_SET

Set offset to absolute position.

Seek relative to the start of the file.

Definition at line 85 of file fcntl.h.

◆ SEEK_SET [2/2]

#define SEEK_SET 0

Seek relative to the start of the file.

Definition at line 86 of file unistd.h.

Function Documentation

◆ dup()

int dup ( int fildes )

Duplicate an open file descriptor to the lowest available descriptor.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/dup.html

◆ dup2()

int dup2	(	int	fildes,
		int	fildes2
	)

Duplicate an open file descriptor to a specific descriptor number.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/dup2.html

◆ fcntl()

int fcntl	(	int	fildes,
		int	cmd,
			...
	)

Perform file control operations on an open file descriptor.

Parameters

fildes	File descriptor.
cmd	Control command (F_GETFD, F_SETFD, F_GETFL, F_SETFL, F_GETLK, …).
...	Optional argument (type depends on `cmd`).

Returns: Command-specific value on success, or -1 with errno set on failure.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html

◆ ftruncate()

int ftruncate	(	int	fildes,
		off_t	length
	)

Truncate an open file to a specified length.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/ftruncate.html

◆ lseek()

off_t lseek	(	int	fildes,
		off_t	offset,
		int	whence
	)

Reposition the file offset of an open file descriptor.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/lseek.html

Macros

Functions