5e3c399d48
This fixes the ugly build errors on Alpine Linux which the old version gave from C type mismatches, and now gives a nice neat line of whales on build... Signed-off-by: Justin Cormack <justin.cormack@docker.com>
44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
// +build !windows
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package utils
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import (
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"io/ioutil"
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"os"
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"strconv"
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"syscall"
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)
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func CloseExecFrom(minFd int) error {
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fdList, err := ioutil.ReadDir("/proc/self/fd")
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if err != nil {
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return err
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}
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for _, fi := range fdList {
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fd, err := strconv.Atoi(fi.Name())
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if err != nil {
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// ignore non-numeric file names
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continue
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}
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if fd < minFd {
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// ignore descriptors lower than our specified minimum
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continue
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}
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// intentionally ignore errors from syscall.CloseOnExec
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syscall.CloseOnExec(fd)
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// the cases where this might fail are basically file descriptors that have already been closed (including and especially the one that was created when ioutil.ReadDir did the "opendir" syscall)
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}
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return nil
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}
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// NewSockPair returns a new unix socket pair
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func NewSockPair(name string) (parent *os.File, child *os.File, err error) {
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fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM|syscall.SOCK_CLOEXEC, 0)
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if err != nil {
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return nil, nil, err
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}
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return os.NewFile(uintptr(fds[1]), name+"-p"), os.NewFile(uintptr(fds[0]), name+"-c"), nil
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}
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