FSYNC(2) BSD System Calls Manual FSYNC(2)
NAME
fsync -- synchronize a file's in-core state with that on disk
SYNOPSIS
#include <unistd.h>
int
fsync(int fd);
DESCRIPTION
Fsync() causes all modified data and attributes of fd to be moved to a permanent storage device. This normally results in all in-core modi-
fied copies of buffers for the associated file to be written to a disk.
Fsync() should be used by programs that require a file to be in a known state, for example, in building a simple transaction facility.
RETURN VALUES
A 0 value is returned on success. A -1 value indicates an error.
ERRORS
The fsync() fails if:
[EBADF] fd is not a valid descriptor.
[EINVAL] fd refers to a socket, not to a file.
[EIO] An I/O error occurred while reading from or writing to the file system.
SEE ALSO
sync(2), sync(8), update(8)
HISTORY
The fsync() function call appeared in 4.2BSD.
4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution
