diff options
| -rw-r--r-- | lib/libc/sys/sendfile.2 | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/libc/sys/sendfile.2 b/lib/libc/sys/sendfile.2 index 878a3ad..1718872 100644 --- a/lib/libc/sys/sendfile.2 +++ b/lib/libc/sys/sendfile.2 @@ -103,6 +103,33 @@ is returned. The FreeBSD implementation of .Fn sendfile is "zero-copy", meaning that it has been optimized so that copying of the file data is avoided. +.Pp +In the non-threaded library +.Fn sendfile +is implemented as the +.Va sendfile +syscall. +.Pp +In the threaded library, the +.Va sendfile +syscall is assembled to +.Fn _thread_sys_sendfile +and +.Fn sendfile +is implemented as a function which locks +.Fa fd +for reading and +.Fa s +for writing, then calls +.Fn _thread_sys_sendfile . +If the call to +.Fn _thread_sys_sendfile +would block, a context switch is performed. Before returning, +.Fn sendfile +unlocks +.Fa fd +and +.Fa s . .Sh RETURN VALUES Upon successful completion, .Fn sendfile |
