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https://github.com/moby/moby.git
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93d41e53ae
Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
31 lines
931 B
Go
31 lines
931 B
Go
package system
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import (
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"fmt"
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"os"
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"syscall"
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"unsafe"
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)
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// Unlockpt unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by f.
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// Unlockpt should be called before opening the slave side of a pseudoterminal.
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func Unlockpt(f *os.File) error {
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var u int
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return Ioctl(f.Fd(), syscall.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
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}
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// Ptsname retrieves the name of the first available pts for the given master.
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func Ptsname(f *os.File) (string, error) {
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var n int
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if err := Ioctl(f.Fd(), syscall.TIOCGPTN, uintptr(unsafe.Pointer(&n))); err != nil {
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return "", err
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}
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return fmt.Sprintf("/dev/pts/%d", n), nil
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}
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// OpenPtmx opens /dev/ptmx, i.e. the PTY master.
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func OpenPtmx() (*os.File, error) {
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// O_NOCTTY and O_CLOEXEC are not present in os package so we use the syscall's one for all.
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return os.OpenFile("/dev/ptmx", syscall.O_RDONLY|syscall.O_NOCTTY|syscall.O_CLOEXEC, 0)
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}
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