fsync - Writes changes in a file to permanent storage
int fsync (
int fildes );
Interfaces documented on this reference page conform to industry standards as follows:
Refer to the standards(5) reference page for more information about industry standards and associated tags.
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.
The file identified by the fildes parameter must be open for writing when the fsync function is issued or the call will fail.
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.
If the fsync function fails, errno may be set to one of the following values:
If any queued I/O operations fail, the fsync function returns error conditions defined for the read and write functions.
Functions: aio_fsync(2), fdatasync(2), fcntl(2), open(2), read(2), sync(2), write(2)
Standards: standards(5) delim off