MirBSD manpage: fsync(2)

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

NAME

     fsync - synchronize a file's in-core state with that on disk

SYNOPSIS

     #include <unistd.h>

     int
     fsync(int fd);

DESCRIPTION

     fsync() causes all modified data and attributes of fd 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.

     fsync() should be used by programs that require a file to be in a known
     state, for example, in building a simple transaction facility.

RETURN VALUES

     A 0 value is returned on success. A -1 value indicates an error.

ERRORS

     The fsync() fails if:

     [EBADF]       fd is not a valid descriptor.

     [EINVAL]      fd refers to a socket, not to a file.

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

SEE ALSO

     sync(2), sync(8), update(8)

HISTORY

     The fsync() function call appeared in 4.2BSD.

MirBSD #10-current               June 4, 1993                                1

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