diff options
Diffstat (limited to 'lib/libc/sys/close.2')
| -rw-r--r-- | lib/libc/sys/close.2 | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/lib/libc/sys/close.2 b/lib/libc/sys/close.2 index 885ac80..1a66e39 100644 --- a/lib/libc/sys/close.2 +++ b/lib/libc/sys/close.2 @@ -30,6 +30,7 @@ .\" SUCH DAMAGE. .\" .\" @(#)close.2 8.2 (Berkeley) 4/19/94 +.\" $Id$ .\" .Dd April 19, 1994 .Dt CLOSE 2 @@ -78,7 +79,7 @@ of the descriptors can be rearranged with or deleted with .Fn close before the -.Xr execve +.Xr execve 2 is attempted, but if some of these descriptors will still be needed if the execve fails, it is necessary to arrange for them to be closed if the execve succeeds. @@ -90,6 +91,28 @@ 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 @@ -107,14 +130,20 @@ An interrupt was received. .El .Sh SEE ALSO .Xr accept 2 , +.Xr execve 2 , +.Xr fcntl 2 , .Xr flock 2 , .Xr open 2 , .Xr pipe 2 , .Xr socket 2 , -.Xr socketpair 2 , -.Xr execve 2 , -.Xr fcntl 2 +.Xr socketpair 2 .Sh STANDARDS -.Fn Close -conforms to IEEE Std 1003.1-1988 -.Pq Dq Tn POSIX . +The +.Fn close +function call is expected to conform to +.St -p1003.1-90 . +.Sh HISTORY +A +.Fn close +function call appeared in +.At v7 . |
