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FSYNC(2) FreeBSD System Calls Manual FSYNC(2)
NAME
fsync -- synchronise changes to a file
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
fsync(int fd);
DESCRIPTION
The fsync() system call causes all modified data and attributes of fd to
be moved to a permanent storage device. This normally results in all in-
core modified copies of buffers for the associated file to be written to
a disk.
The fsync() system call should be used by programs that require a file to
be in a known state, for example, in building a simple transaction facil-
ity.
RETURN VALUES
The fsync() function returns the value 0 if successful; otherwise the
value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
The fsync() fails if:
[EBADF] The fd argument is not a valid descriptor.
[EINVAL] The fd argument 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), syncer(4), sync(8)
HISTORY
The fsync() system call appeared in 4.2BSD.
FreeBSD 6.2 June 4, 1993 FreeBSD 6.2
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This page was generated on Fri Sep 21 07:56:35 BST 2007
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