Content-type: text/html Man page of fsync

fsync

Section: System Calls (2)
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NAME

fsync - Writes changes in a file to permanent storage  

SYNOPSIS

#include <unistd.h>

int fsync (        int fildes );
 

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

fsync(): XPG4

Refer to the standards(5) reference page for more information about industry standards and associated tags.  

PARAMETERS

Specifies a valid open file descriptor.  

DESCRIPTION

The fsync function causes system buffers containing a file's modified data and attributes to be written to permanent storage. The fsync function does not return until the operation has been completed. The fsync function provides file integrity, ensuring that data and file attribute information in permanent storage is identical to data and file attribute information in the buffer.  

NOTES

The file identified by the fildes parameter must be open for writing when the fsync function is issued or the call will fail.  

RETURN VALUES

Upon successful completion, the fsync function returns a value of 0 (zero). If the fsync function fails, a value of -1 is returned and errno is set to indicate the error. If fsync fails, outstanding I/O operations are not guaranteed to have been completed.  

ERRORS

If the fsync function fails, errno may be set to one of the following values:

[EBADF]
The fildes parameter is not a valid file descriptor.
[EINVAL]
The fildes parameter does not refer to a file on which this operation is possible.

If any queued I/O operations fail, the fsync function returns error conditions defined for the read and write functions.  

RELATED INFORMATION

Functions: aio_fsync(2), fdatasync(2), fcntl(2), open(2), read(2), sync(2), write(2)

Standards: standards(5) delim off


 

Index

NAME
SYNOPSIS
STANDARDS
PARAMETERS
DESCRIPTION
NOTES
RETURN VALUES
ERRORS
RELATED INFORMATION

This document was created by man2html, using the manual pages.
Time: 02:40:16 GMT, October 02, 2010