projects / apple / xnu.git / blame
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|---|---|---|
| 9bccf70c A |
1 | .\" $NetBSD: fsync.2,v 1.4 1995/02/27 12:32:38 cgd Exp $ |
| 2 | .\" | |
| 3 | .\" Copyright (c) 1983, 1993 | |
| 4 | .\" The Regents of the University of California. All rights reserved. | |
| 5 | .\" | |
| 6 | .\" Redistribution and use in source and binary forms, with or without | |
| 7 | .\" modification, are permitted provided that the following conditions | |
| 8 | .\" are met: | |
| 9 | .\" 1. Redistributions of source code must retain the above copyright | |
| 10 | .\" notice, this list of conditions and the following disclaimer. | |
| 11 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
| 12 | .\" notice, this list of conditions and the following disclaimer in the | |
| 13 | .\" documentation and/or other materials provided with the distribution. | |
| 14 | .\" 3. All advertising materials mentioning features or use of this software | |
| 15 | .\" must display the following acknowledgement: | |
| 16 | .\" This product includes software developed by the University of | |
| 17 | .\" California, Berkeley and its contributors. | |
| 18 | .\" 4. Neither the name of the University nor the names of its contributors | |
| 19 | .\" may be used to endorse or promote products derived from this software | |
| 20 | .\" without specific prior written permission. | |
| 21 | .\" | |
| 22 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 23 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 24 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 25 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 26 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 27 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 28 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 29 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 30 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 31 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 32 | .\" SUCH DAMAGE. | |
| 33 | .\" | |
| 34 | .\" @(#)fsync.2 8.1 (Berkeley) 6/4/93 | |
| 35 | .\" | |
| 36 | .Dd June 4, 1993 | |
| 37 | .Dt FSYNC 2 | |
| 38 | .Os BSD 4.2 | |
| 39 | .Sh NAME | |
| 40 | .Nm fsync | |
| 41 | .Nd "synchronize a file's in-core state with that on disk" | |
| 42 | .Sh SYNOPSIS | |
| 43 | .Fd #include <unistd.h> | |
| 44 | .Ft int | |
| 45 | .Fn fsync "int fd" | |
| 46 | .Sh DESCRIPTION | |
| 47 | .Fn Fsync | |
| 48 | causes all modified data and attributes of | |
| 49 | .Fa fd | |
| 50 | to be moved to a permanent storage device. | |
| 51 | This normally results in all in-core modified copies | |
| 52 | of buffers for the associated file to be written to a disk. | |
| 53 | .Pp | |
| 54 | .Fn Fsync | |
| 55 | should be used by programs that require a file to be | |
| 56 | in a known state, for example, in building a simple transaction | |
| 57 | facility. | |
| 58 | .Sh RETURN VALUES | |
| 59 | A 0 value is returned on success. A -1 value indicates | |
| 60 | an error. | |
| 61 | .Sh ERRORS | |
| 62 | The | |
| 63 | .Fn fsync | |
| 64 | fails if: | |
| 65 | .Bl -tag -width Er | |
| 66 | .It Bq Er EBADF | |
| 67 | .Fa Fd | |
| 68 | is not a valid descriptor. | |
| 69 | .It Bq Er EINVAL | |
| 70 | .Fa Fd | |
| 71 | refers to a socket, not to a file. | |
| 72 | .It Bq Er EIO | |
| 73 | An I/O error occurred while reading from or writing to the file system. | |
| 74 | .El | |
| 75 | .Sh SEE ALSO | |
| 76 | .Xr sync 2 , | |
| 77 | .Xr sync 8 , | |
| 78 | .Xr update 8 | |
| 79 | .Sh HISTORY | |
| 80 | The | |
| 81 | .Fn fsync | |
| 82 | function call appeared in | |
| 83 | .Bx 4.2 . |