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