POSIX_FILE_LOCKING

POSIX File Locking option group. More...

Data Structures
struct	flock
	File segment locking structure used with F_GETLK, F_SETLK, and F_SETLKW. More...

Macros
#define	F_GETLK   ZVFS_F_GETLK
	Get the first lock that blocks the lock described by the argument.
#define	F_SETLK   ZVFS_F_SETLK
	Set or clear a file segment lock (non-blocking).
#define	F_SETLKW   ZVFS_F_SETLKW
	Set or clear a file segment lock (blocking).
#define	F_RDLCK   ZVFS_F_RDLCK
	Lock type: shared read lock.
#define	F_UNLCK   ZVFS_F_UNLCK
	Lock type: unlock (release a lock).
#define	F_WRLCK   ZVFS_F_WRLCK
	Lock type: exclusive write lock.

Functions
void	flockfile (FILE *file)
	Acquire a stdio stream lock.
int	ftrylockfile (FILE *file)
	Try to acquire a stdio stream lock without blocking.
void	funlockfile (FILE *file)
	Release a stdio stream lock.
int	getc_unlocked (FILE *stream)
	Read a byte from a stream without acquiring the stream lock.
int	getchar_unlocked (void)
	Read a byte from stdin without acquiring the stream lock.
int	putc_unlocked (int c, FILE *stream)
	Write a byte to a stream without acquiring the stream lock.
int	putchar_unlocked (int c)
	Write a byte to stdout without acquiring the stream lock.

Detailed Description

POSIX File Locking option group.

Macro Definition Documentation

F_GETLK

#define F_GETLK   ZVFS_F_GETLK

Get the first lock that blocks the lock described by the argument.

Definition at line 48 of file fcntl.h.

F_RDLCK

#define F_RDLCK   ZVFS_F_RDLCK

Lock type: shared read lock.

Definition at line 66 of file fcntl.h.

F_SETLK

#define F_SETLK   ZVFS_F_SETLK

Set or clear a file segment lock (non-blocking).

Definition at line 50 of file fcntl.h.

F_SETLKW

#define F_SETLKW   ZVFS_F_SETLKW

Set or clear a file segment lock (blocking).

Definition at line 52 of file fcntl.h.

F_UNLCK

#define F_UNLCK   ZVFS_F_UNLCK

Lock type: unlock (release a lock).

Definition at line 68 of file fcntl.h.

F_WRLCK

#define F_WRLCK   ZVFS_F_WRLCK

Lock type: exclusive write lock.

Definition at line 70 of file fcntl.h.

Function Documentation

flockfile()

void flockfile

(

FILE *

file

)

Acquire a stdio stream lock.

Parameters

file	Stream to lock.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/flockfile.html

ftrylockfile()

int ftrylockfile

(

FILE *

file

)

Try to acquire a stdio stream lock without blocking.

Parameters

file	Stream to lock.

Returns

0 if the lock was acquired, non-zero otherwise.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/ftrylockfile.html

funlockfile()

void funlockfile

(

FILE *

file

)

Release a stdio stream lock.

Parameters

file	Stream to unlock.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/funlockfile.html

getc_unlocked()

int getc_unlocked

(

FILE *

stream

)

Read a byte from a stream without acquiring the stream lock.

Parameters

stream

Stream to read from.

Returns

Byte read as an unsigned char cast to int, or EOF.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/getc_unlocked.html

getchar_unlocked()

int getchar_unlocked

(

void

)

Read a byte from stdin without acquiring the stream lock.

Returns

Byte read as an unsigned char cast to int, or EOF.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/getchar_unlocked.html

putc_unlocked()

int putc_unlocked	(	int	c,
		FILE *	stream
	)

Write a byte to a stream without acquiring the stream lock.

Parameters

c	Byte to write.
stream	Stream to write to.

Returns

Byte written as an unsigned char cast to int, or EOF.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/putc_unlocked.html

putchar_unlocked()

int putchar_unlocked

(

int

c

)

Write a byte to stdout without acquiring the stream lock.

Parameters

c	Byte to write.

Returns

Byte written as an unsigned char cast to int, or EOF.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/putchar_unlocked.html