Source file src/pkg/cmd/vendor/golang.org/x/sys/unix/fcntl.go

     1	// Copyright 2014 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	// +build dragonfly freebsd linux netbsd openbsd
     6	
     7	package unix
     8	
     9	import "unsafe"
    10	
    11	// fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux
    12	// systems by flock_linux_32bit.go to be SYS_FCNTL64.
    13	var fcntl64Syscall uintptr = SYS_FCNTL
    14	
    15	// FcntlInt performs a fcntl syscall on fd with the provided command and argument.
    16	func FcntlInt(fd uintptr, cmd, arg int) (int, error) {
    17		valptr, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(arg))
    18		var err error
    19		if errno != 0 {
    20			err = errno
    21		}
    22		return int(valptr), err
    23	}
    24	
    25	// FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
    26	func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
    27		_, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk)))
    28		if errno == 0 {
    29			return nil
    30		}
    31		return errno
    32	}
    33	

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