fsync(S)

fsync -- synchronize changes to a file

Syntax

cc . . . -lc

int fsync(fildes)
int fildes;

Description

The fsync(S) routine causes all modified data and attributes of the file referred to by fildes to be written to storage media. This routine should be called when a program needs to record to storage media all its modifications to a file before continuing, for example, in updating a record during a transaction.

Return value

Upon successful completion, fsync(S) returns zero; otherwise, fsync(S) returns -1 and sets errno.

Diagnostics

fsync(S) will fail if:

[EBADF]: fildes is not a valid file descriptor.
[EINTR]: fsync(S) was interrupted by a signal.
[EINVAL]: It is impossible to write to the file referred to by fildes.
[EIO]: An I/O error occurred while reading from or writing to the file system.

Standards conformance