diff options
Diffstat (limited to 'lib/libc/sys/close.2')
| -rw-r--r-- | lib/libc/sys/close.2 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/libc/sys/close.2 b/lib/libc/sys/close.2 index 885ac80..3cb3d51 100644 --- a/lib/libc/sys/close.2 +++ b/lib/libc/sys/close.2 @@ -90,6 +90,28 @@ execve; the call .Dq Li fcntl(d, F_SETFD, 0) restores the default, which is to not close the descriptor. +.Sh IMPLEMENTATION NOTES +.Pp +In the non-threaded library +.Fn close +is implemented as the +.Va close +syscall. +.Pp +In the threaded library, the +.Va close +syscall is assembled to +.Fn _thread_sys_close +and +.Fn close +is implemented as a function which locks +.Va d +for read and write, then calls +.Fn _thread_sys_close . +Before returning, +.Fn close +unlocks +.Va d . .Sh RETURN VALUES Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and the global integer variable |
