diff options
Diffstat (limited to 'lib/libc/sys/fsync.2')
| -rw-r--r-- | lib/libc/sys/fsync.2 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/libc/sys/fsync.2 b/lib/libc/sys/fsync.2 index 234ea6e996ed..1116cf9b3605 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. |