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Merge pull request #6200 from gkurz/improve-appendFDs-doc
runtime: Improve documentation of appendFDs
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86501d5f6f
@ -2631,8 +2631,9 @@ type Config struct {
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qemuParams []string
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}
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// appendFDs append a list of file descriptors to the qemu configuration and
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// returns a slice of offset file descriptors that will be seen by the qemu process.
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// appendFDs appends a list of arbitrary file descriptors to the qemu configuration and
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// returns a slice of consecutive file descriptors that will be seen by the qemu process.
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// Please see the comment below for details.
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func (config *Config) appendFDs(fds []*os.File) []int {
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var fdInts []int
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@ -2644,6 +2645,10 @@ func (config *Config) appendFDs(fds []*os.File) []int {
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// ExtraFiles specifies additional open files to be inherited by the
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// new process. It does not include standard input, standard output, or
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// standard error. If non-nil, entry i becomes file descriptor 3+i.
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// This means that arbitrary file descriptors fd0, fd1... fdN passed in
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// the array will be presented to the guest as consecutive descriptors
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// 3, 4... N+3. The golang library internally relies on dup2() to do
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// the renumbering.
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for i := range fds {
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fdInts = append(fdInts, oldLen+3+i)
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}
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