Source file src/os/executable_freebsd.go

     1	// Copyright 2016 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package os
     6	
     7	import (
     8		"syscall"
     9		"unsafe"
    10	)
    11	
    12	func executable() (string, error) {
    13		mib := [4]int32{1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1}
    14	
    15		n := uintptr(0)
    16		// get length
    17		_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
    18		if err != 0 {
    19			return "", err
    20		}
    21		if n == 0 { // shouldn't happen
    22			return "", nil
    23		}
    24		buf := make([]byte, n)
    25		_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
    26		if err != 0 {
    27			return "", err
    28		}
    29		if n == 0 { // shouldn't happen
    30			return "", nil
    31		}
    32		return string(buf[:n-1]), nil
    33	}
    34	

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