diff options
Diffstat (limited to 'lib/libc/sys/fsync.2')
| -rw-r--r-- | lib/libc/sys/fsync.2 | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/lib/libc/sys/fsync.2 b/lib/libc/sys/fsync.2 index 234ea6e..74105ec 100644 --- a/lib/libc/sys/fsync.2 +++ b/lib/libc/sys/fsync.2 @@ -53,6 +53,28 @@ of buffers for the associated file to be written to a disk. should be used by programs that require a file to be in a known state, for example, in building a simple transaction facility. +.Sh IMPLEMENTATION NOTES +.Pp +In the non-threaded library +.Fn fsync +is implemented as the +.Va fsync +syscall. +.Pp +In the threaded library, the +.Va fsync +syscall is assembled to +.Fn _thread_sys_fsync +and +.Fn fsync +is implemented as a function which locks +.Va fd +for read and write, then calls +.Fn _thread_sys_fsync . +Before returning, +.Fn fsync +unlocks +.Va fd . .Sh RETURN VALUES A 0 value is returned on success. A -1 value indicates an error. @@ -72,10 +94,10 @@ An I/O error occurred while reading from or writing to the file system. .El .Sh SEE ALSO .Xr sync 2 , -.Xr sync 8 , -.Xr update 8 +.Xr update 4 , +.Xr sync 8 .Sh HISTORY The -.Nm +.Fn fsync function call appeared in .Bx 4.2 . |
