usr/man/cat2/fsync.0



FSYNC(2)            UNIX Programmer's Manual             FSYNC(2)


N\bNA\bAM\bME\bE
     fsync - synchronize a file's in-core state with that on disk

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
     f\bfs\bsy\byn\bnc\bc(\b(f\bfd\bd)\b)
     i\bin\bnt\bt f\bfd\bd;\b;

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     _\bF_\bs_\by_\bn_\bc causes all modified data and attributes of _\bf_\bd to be
     moved to a permanent storage device.  This normally results
     in all in-core modified copies of buffers for the associated
     file to be written to a disk.

     _\bF_\bs_\by_\bn_\bc should be used by programs that require a file to be
     in a known state, for example, in building a simple transac-
     tion facility.

R\bRE\bET\bTU\bUR\bRN\bN V\bVA\bAL\bLU\bUE\bE
     A 0 value is returned on success.  A -1 value indicates an
     error.

E\bER\bRR\bRO\bOR\bRS\bS
     The _\bf_\bs_\by_\bn_\bc fails if:

     [EBADF]        _\bF_\bd is not a valid descriptor.

     [EINVAL]       _\bF_\bd refers to a socket, not to a file.

     [EIO]          An I/O error occurred while reading from or
                    writing to the file system.

S\bSE\bEE\bE A\bAL\bLS\bSO\bO
     sync(2), sync(8), update(8)


Printed 7/9/88            May 22, 1986                          1