projects / unix-history / blame
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1 | .\" Copyright (c) 1983 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| 7b12e899 | 5 | .\" @(#)fsync.2 6.4 (Berkeley) %G% |
| 76a31391 | 6 | .\" |
| bc55b6ca | 7 | .TH FSYNC 2 "" |
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8 | .UC 5 |
| 9 | .SH NAME | |
| 10 | fsync \- synchronize a file's in-core state with that on disk | |
| 11 | .SH SYNOPSIS | |
| 12 | .ft B | |
| 13 | fsync(fd) | |
| 14 | .br | |
| 15 | int fd; | |
| 16 | .ft R | |
| 17 | .SH DESCRIPTION | |
| 18 | .I Fsync | |
| 19 | causes all modified data and attributes of \fIfd\fP | |
| 20 | to be moved to a permanent storage device. | |
| 21 | This normally results in all in-core modified copies | |
| 22 | of buffers for the associated file to be written to a disk. | |
| 23 | .PP | |
| 24 | .I Fsync | |
| b4c94b6d | 25 | should be used by programs that require a file to be |
| 7b12e899 | 26 | in a known state, for example, in building a simple transaction |
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27 | facility. |
| 28 | .SH "RETURN VALUE | |
| 29 | A 0 value is returned on success. A \-1 value indicates | |
| 30 | an error. | |
| 31 | .SH "ERRORS | |
| 32 | The \fIfsync\fP fails if: | |
| 33 | .TP 15 | |
| 34 | [EBADF] | |
| 35 | \fIFd\fP is not a valid descriptor. | |
| 36 | .TP 15 | |
| 37 | [EINVAL] | |
| 38 | \fIFd\fP refers to a socket, not to a file. | |
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39 | .TP 15 |
| 40 | [EIO] | |
| 41 | An I/O error occurred while reading from or writing to the file system. | |
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42 | .SH "SEE ALSO" |
| 43 | sync(2), sync(8), update(8) |