fsync man page on PC-BSD

fsync man page on PC-BSD

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FSYNC(2)		    BSD 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.

BSD				 June 4, 1993				   BSD

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