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Source file src/syscall/flock.go

Documentation: syscall

     1  //go:build linux || freebsd || openbsd || netbsd || dragonfly
     2  // +build linux freebsd openbsd netbsd dragonfly
     3  
     4  // Copyright 2014 The Go Authors. All rights reserved.
     5  // Use of this source code is governed by a BSD-style
     6  // license that can be found in the LICENSE file.
     7  
     8  package syscall
     9  
    10  import "unsafe"
    11  
    12  // fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux
    13  // systems by flock_linux_32bit.go to be SYS_FCNTL64.
    14  var fcntl64Syscall uintptr = SYS_FCNTL
    15  
    16  // FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
    17  func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
    18  	_, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk)))
    19  	if errno == 0 {
    20  		return nil
    21  	}
    22  	return errno
    23  }
    24  

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