projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 189a2f10 | 1 | .\" Copyright (c) 1991, 1991 Regents of the University of California. |
| e792f309 KM |
2 | .\" All rights reserved. |
| 3 | .\" | |
| 189a2f10 | 4 | .\" %sccs.include.redist.roff% |
| e792f309 | 5 | .\" |
| 3f6f0ccf | 6 | .\" @(#)msync.2 8.1 (Berkeley) %G% |
| e792f309 | 7 | .\" |
| 189a2f10 CL |
8 | .Dd |
| 9 | .Dt MSYNC 2 | |
| 10 | .Os | |
| 11 | .Sh NAME | |
| 12 | .Nm msync | |
| 13 | .Nd synchronize a mapped region | |
| 14 | .Sh SYNOPSIS | |
| 15 | .Fn msync "caddr_t addr" "int len" | |
| 16 | .Sh DESCRIPTION | |
| 17 | The | |
| 18 | .Fn msync | |
| 19 | system call | |
| e792f309 KM |
20 | writes any modified pages back to the filesystem and updates |
| 21 | the file modification time. | |
| 189a2f10 CL |
22 | If |
| 23 | .Fa len | |
| 24 | is 0, all modified pages within the region containing | |
| 25 | .Fa addr | |
| e792f309 | 26 | will be flushed; |
| 189a2f10 CL |
27 | if |
| 28 | .Fa len | |
| 29 | is non-zero, only the pages containing | |
| 30 | .Fa addr | |
| 31 | and | |
| 32 | .Fa len | |
| e792f309 KM |
33 | succeeding locations will be examined. |
| 34 | Any required synchronization of memory caches | |
| 35 | will also take place at this time. | |
| 36 | Filesystem operations on a file that is mapped for shared modifications | |
| 189a2f10 CL |
37 | are unpredictable except after an |
| 38 | .Fn msync . | |
| 39 | .Sh SEE ALSO | |
| 40 | .Xr madvise 2 , | |
| 41 | .Xr munmap 2 , | |
| 42 | .Xr mprotect 2 , | |
| 43 | .Xr mincore 2 | |
| 44 | .Sh HISTORY | |
| 45 | The | |
| 46 | .Fn msync | |
| 47 | function call is | |
| 48 | .Ud . | |
| 49 |