FSYNC(2) UNIX Programmer's Manual FSYNC(2) NAME fsync - synchronize a file's in-core state with that on disk SYNOPSIS fsync(fd) int fd; DESCRIPTION _F_s_y_n_c causes all modified data and attributes of _f_d 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. _F_s_y_n_c should be used by programs that require a file to be in a known state, for example, in building a simple transac- tion facility. RETURN VALUE A 0 value is returned on success. A -1 value indicates an error. ERRORS The _f_s_y_n_c fails if: [EBADF] _F_d is not a valid descriptor. [EINVAL] _F_d refers to a socket, not to a file. [EIO] An I/O error occurred while reading from or writing to the file system. SEE ALSO sync(2), sync(8), update(8) Printed 11/26/99 May 22, 1986 1