syscall: implement nametomib for openbsd.
Move the existing darwin/freebsd specific nametomib implementation
into the respective operating system dependent files.
Provide a nametomib implementation for openbsd, which operates on a
sysctl MIB that has been pre-generated from the various system headers
by mksysctl_openbsd.pl.
R=rsc
CC=golang-dev
https://golang.org/cl/4935044
diff --git a/src/pkg/syscall/syscall_openbsd.go b/src/pkg/syscall/syscall_openbsd.go
index 805fbe1..16247e9 100644
--- a/src/pkg/syscall/syscall_openbsd.go
+++ b/src/pkg/syscall/syscall_openbsd.go
@@ -30,6 +30,28 @@
func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
+func nametomib(name string) (mib []_C_int, err error) {
+
+ // Perform lookup via a binary search
+ left := 0
+ right := len(sysctlMib) - 1
+ for {
+ idx := left + (right-left)/2
+ switch {
+ case name == sysctlMib[idx].ctlname:
+ return sysctlMib[idx].ctloid, nil
+ case name > sysctlMib[idx].ctlname:
+ left = idx + 1
+ default:
+ right = idx - 1
+ }
+ if left > right {
+ break
+ }
+ }
+ return nil, EINVAL
+}
+
// ParseDirent parses up to max directory entries in buf,
// appending the names to names. It returns the number
// bytes consumed from buf, the number of entries added
