github.com/rkt/rkt@v1.30.1-0.20200224141603-171c416fac02/pkg/sys/sys.go (about)

     1  // Copyright 2015 The rkt Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package sys
    16  
    17  import (
    18  	"syscall"
    19  )
    20  
    21  // CloseOnExec sets or clears FD_CLOEXEC flag on a file descriptor
    22  func CloseOnExec(fd int, set bool) error {
    23  	flag := uintptr(0)
    24  	if set {
    25  		flag = syscall.FD_CLOEXEC
    26  	}
    27  	_, _, err := syscall.RawSyscall(syscall.SYS_FCNTL, uintptr(fd), syscall.F_SETFD, flag)
    28  	if err != 0 {
    29  		return syscall.Errno(err)
    30  	}
    31  	return nil
    32  }