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FSYNC(2)                  FreeBSD System Calls Manual                 FSYNC(2)

NAME
     fsync -- synchronise changes to a file

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     fsync(int fd);

DESCRIPTION
     The fsync() system call 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.

     The fsync() system call should be used by programs that require a file to
     be in a known state, for example, in building a simple transaction facil-
     ity.

RETURN VALUES
     The fsync() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     The fsync() fails if:

     [EBADF]            The fd argument is not a valid descriptor.

     [EINVAL]           The fd argument 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), syncer(4), sync(8)

HISTORY
     The fsync() system call appeared in 4.2BSD.

FreeBSD 6.2                      June 4, 1993                      FreeBSD 6.2

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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