github.com/guyezi/gofrontend@v0.0.0-20200228202240-7a62a49e62c0/libgo/go/internal/poll/fcntl_libc.go (about)

     1  // Copyright 2019 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 aix darwin solaris
     6  
     7  package poll
     8  
     9  import (
    10  	"syscall"
    11  )
    12  
    13  // Use a helper function to call fcntl.  This is defined in C in
    14  // libgo/runtime.
    15  //extern __go_fcntl_uintptr
    16  func libc_fcntl(uintptr, uintptr, uintptr) (uintptr, uintptr)
    17  
    18  func fcntl(fd int, cmd int, arg int) (int, error) {
    19  	syscall.Entersyscall()
    20  	r, e := libc_fcntl(uintptr(fd), uintptr(cmd), uintptr(arg))
    21  	syscall.Exitsyscall()
    22  	if e != 0 {
    23  		return int(r), syscall.Errno(e)
    24  	}
    25  	return int(r), nil
    26  }