diff options
Diffstat (limited to 'lib/libc/sys/ioctl.2')
| -rw-r--r-- | lib/libc/sys/ioctl.2 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/libc/sys/ioctl.2 b/lib/libc/sys/ioctl.2 index 36ce6ff47f65..38c58b9dcf59 100644 --- a/lib/libc/sys/ioctl.2 +++ b/lib/libc/sys/ioctl.2 @@ -68,6 +68,28 @@ Macros and defines used in specifying an ioctl .Fa request are located in the file .Ao Pa sys/ioctl.h Ac . +.Sh IMPLEMENTATION NOTES +.Pp +In the non-threaded library +.Fn ioctl +is implemented as the +.Va ioctl +syscall. +.Pp +In the threaded library, the +.Va ioctl +syscall is assembled to +.Fn _thread_sys_ioctl +and +.Fn ioctl +is implemented as a function which locks +.Va d +for read and write, then calls +.Fn _thread_sys_ioctl . +Before returning, +.Fn ioctl +unlocks +.Va d . .Sh RETURN VALUES If an error has occurred, a value of -1 is returned and .Va errno |