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FDATASYNC(2) Linux Programmer's Manual FDATASYNC(2)
fdatasync - synchronize a file's in-core data with that on disk
int fdatasync(int fd);
fdatasync flushes all data buffers of a file to disk (before the system call returns). It
resembles fsync but is not required to update the metadata such as access time.
Applications that access databases or log files often write a tiny data fragment (e.g.,
one line in a log file) and then call fsync immediately in order to ensure that the writ-
ten data is physically stored on the harddisk. Unfortunately, fsync will always initiate
two write operations: one for the newly written data and another one in order to update
the modification time stored in the inode. If the modification time is not a part of the
transaction concept fdatasync can be used to avoid unnecessary inode disk write opera-
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
EBADF fd is not a valid file descriptor open for writing.
fd is bound to a special file which does not support synchronization.
EIO An error occurred during synchronization.
Currently (Linux 2.2) fdatasync is equivalent to fsync.
POSIX1b (formerly POSIX.4)
fsync(2), B.O. Gallmeister, POSIX.4, O'Reilly, pp. 220-223 and 343.
Linux 1.3.86 1996-04-13 FDATASYNC(2)
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