FDATASYNC(3C)FDATASYNC(3C)NAME
fdatasync - synchronize a file's data
SYNOPSIS
#include <unistd.h>
int fdatasync(int fildes);
DESCRIPTION
The fdatasync() function forces all currently queued I/O operations
associated with the file indicated by file descriptor fildes to the
synchronized I/O completion state.
The functionality is as described for fsync(3C) (with the symbol
_XOPEN_REALTIME defined), with the exception that all I/O operations
are completed as defined for synchronised I/O data integrity comple‐
tion.
RETURN VALUES
If successful, the fdatasync() function returns 0. Otherwise, the func‐
tion returns −1 and sets errno to indicate the error. If the fdata‐
sync() function fails, outstanding I/O operations are not guaranteed to
have been completed.
ERRORS
The fdatasync() function will fail if:
EBADF
The fildes argument is not a valid file descriptor open for
writing.
EINVAL
The system does not support synchronized I/O for this file.
ENOSYS
The function fdatasync() is not supported by the system.
In the event that any of the queued I/O operations fail, fdatasync()
returns the error conditions defined for read(2) and write(2).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬───────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼───────────────────┤
│Interface Stability │ Committed │
├────────────────────┼───────────────────┤
│MT-Level │ Async-Signal-Safe │
├────────────────────┼───────────────────┤
│Standard │ See standards(5). │
└────────────────────┴───────────────────┘
SEE ALSOfcntl(2), open(2), read(2), write(2), fsync(3C), aio_fsync(3C),
fcntl.h(3HEAD), attributes(5), standards(5)
Feb 5, 2008 FDATASYNC(3C)