@node fsync, stdio
@subheading Syntax

@example
#include <unistd.h>

int fsync(int file);
@end example

@subheading Description

Forces all information about the file with the given descriptor to be
synchronized with the disk image.  Works by calling DOS function 0x68.
@emph{Warning}: External disk caches are not flushed by this function.

@subheading Return Value

Zero on success, nonzero on failure. 

@subheading Portability

@portability !ansi, !posix

@subheading Example

@example
fsync(fileno(stdout));
@end example