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// Copyright 2020 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.
// +build darwin dragonfly freebsd netbsd openbsd
// BSD library calls.
package syscall
import (
"unsafe"
)
//sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error)
//sysctl(mib *_C_int, miblen uintptr, old *byte, oldlen *uintptr, new *byte, newlen uintptr) _C_int
//sysnb raw_ptrace(request int, pid int, addr uintptr, data uintptr) (err Errno)
//ptrace(request _C_int, pid Pid_t, addr *byte, data _C_int) _C_int
//sys paccept(fd int, rsa *RawSockaddrAny, addrlen *Socklen_t, sigmask *_sigset_t, flags int) (nfd int, err error)
//paccept(s _C_int, rsa *RawSockaddrAny, addrlen *Socklen_t, sigmask *_sigset_t, flags int) _C_int
//sys Flock(fd int, how int) (err error)
//flock(fd _C_int, how _C_int) _C_int
func ReadDirent(fd int, buf []byte) (n int, err error) {
// Final argument is (basep *uintptr) and the syscall doesn't take nil.
// 64 bits should be enough. (32 bits isn't even on 386). Since the
// actual system call is getdirentries64, 64 is a good guess.
// TODO(rsc): Can we use a single global basep for all calls?
var base = (*uintptr)(unsafe.Pointer(new(uint64)))
return Getdirentries(fd, buf, base)
}
func Accept4(fd, flags int) (nfd int, sa Sockaddr, err error) {
var rsa RawSockaddrAny
var len Socklen_t = SizeofSockaddrAny
nfd, err = paccept(fd, &rsa, &len, nil, flags)
if err != nil {
return
}
if len > SizeofSockaddrAny {
panic("RawSockaddrAny too small")
}
sa, err = anyToSockaddr(&rsa)
if err != nil {
Close(nfd)
nfd = 0
}
return
}
//sysnb pipe2(p *[2]_C_int, flags int) (err error)
//pipe2(p *[2]_C_int, flags _C_int) _C_int
func Pipe2(p []int, flags int) (err error) {
if len(p) != 2 {
return EINVAL
}
var pp [2]_C_int
err = pipe2(&pp, flags)
p[0] = int(pp[0])
p[1] = int(pp[1])
return
}
func Sysctl(name string) (value string, err error) {
// Translate name to mib number.
mib, err := nametomib(name)
if err != nil {
return "", err
}
// Find size.
n := uintptr(0)
if err = sysctl(mib, nil, &n, nil, 0); err != nil {
return "", err
}
if n == 0 {
return "", nil
}
// Read into buffer of that size.
buf := make([]byte, n)
if err = sysctl(mib, &buf[0], &n, nil, 0); err != nil {
return "", err
}
// Throw away terminating NUL.
if n > 0 && buf[n-1] == '\x00' {
n--
}
return string(buf[0:n]), nil
}
func SysctlUint32(name string) (value uint32, err error) {
// Translate name to mib number.
mib, err := nametomib(name)
if err != nil {
return 0, err
}
// Read into buffer of that size.
n := uintptr(4)
buf := make([]byte, 4)
if err = sysctl(mib, &buf[0], &n, nil, 0); err != nil {
return 0, err
}
if n != 4 {
return 0, EIO
}
return *(*uint32)(unsafe.Pointer(&buf[0])), nil
}
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