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// Copyright 2009,2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import "unsafe"
func direntIno(buf []byte) (uint64, bool) {
return readInt(buf, unsafe.Offsetof(Dirent{}.Fileno), unsafe.Sizeof(Dirent{}.Fileno))
}
func direntReclen(buf []byte) (uint64, bool) {
return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
}
func direntNamlen(buf []byte) (uint64, bool) {
return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen))
}
//sys Getdents(fd int, buf []byte) (n int, err error)
//getdents(fd _C_int, buf *byte, nbytes uintptr) _C_int
func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
n, err = Getdents(fd, buf)
if err != nil || basep == nil {
return
}
var off int64
off, err = Seek(fd, 0, 1 /* SEEK_CUR */)
if err != nil {
*basep = ^uintptr(0)
return
}
*basep = uintptr(off)
if unsafe.Sizeof(*basep) == 8 {
return
}
if off>>32 != 0 {
// We can't stuff the offset back into a uintptr, so any
// future calls would be suspect. Generate an error.
// EIO is allowed by getdirentries.
err = EIO
}
return
}
func sysctlNodes(mib []_C_int) (nodes []Sysctlnode, err error) {
var olen uintptr
// Get a list of all sysctl nodes below the given MIB by performing
// a sysctl for the given MIB with CTL_QUERY appended.
mib = append(mib, CTL_QUERY)
qnode := Sysctlnode{Flags: SYSCTL_VERS_1}
qp := (*byte)(unsafe.Pointer(&qnode))
sz := unsafe.Sizeof(qnode)
if err = sysctl(mib, nil, &olen, qp, sz); err != nil {
return nil, err
}
// Now that we know the size, get the actual nodes.
nodes = make([]Sysctlnode, olen/sz)
np := (*byte)(unsafe.Pointer(&nodes[0]))
if err = sysctl(mib, np, &olen, qp, sz); err != nil {
return nil, err
}
return nodes, nil
}
func nametomib(name string) (mib []_C_int, err error) {
// Split name into components.
var parts []string
last := 0
for i := 0; i < len(name); i++ {
if name[i] == '.' {
parts = append(parts, name[last:i])
last = i + 1
}
}
parts = append(parts, name[last:])
// Discover the nodes and construct the MIB OID.
for partno, part := range parts {
nodes, err := sysctlNodes(mib)
if err != nil {
return nil, err
}
for _, node := range nodes {
n := make([]byte, 0)
for i := range node.Name {
if node.Name[i] != 0 {
n = append(n, byte(node.Name[i]))
}
}
if string(n) == part {
mib = append(mib, _C_int(node.Num))
break
}
}
if len(mib) != partno+1 {
return nil, EINVAL
}
}
return mib, nil
}
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