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vendor: github.com/creack/pty v1.1.24
Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
This commit is contained in:
141
vendor/github.com/creack/pty/pty_zos.go
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vendored
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141
vendor/github.com/creack/pty/pty_zos.go
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@ -0,0 +1,141 @@
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//go:build zos
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// +build zos
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package pty
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import (
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"os"
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"runtime"
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"syscall"
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"unsafe"
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)
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const (
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SYS_UNLOCKPT = 0x37B
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SYS_GRANTPT = 0x37A
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SYS_POSIX_OPENPT = 0xC66
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SYS_FCNTL = 0x18C
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SYS___PTSNAME_A = 0x718
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SETCVTON = 1
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O_NONBLOCK = 0x04
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F_SETFL = 4
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F_CONTROL_CVT = 13
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)
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type f_cnvrt struct {
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Cvtcmd int32
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Pccsid int16
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Fccsid int16
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}
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func open() (pty, tty *os.File, err error) {
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ptmxfd, err := openpt(os.O_RDWR | syscall.O_NOCTTY)
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if err != nil {
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return nil, nil, err
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}
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// Needed for z/OS so that the characters are not garbled if ptyp* is untagged
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cvtreq := f_cnvrt{Cvtcmd: SETCVTON, Pccsid: 0, Fccsid: 1047}
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if _, err = fcntl(uintptr(ptmxfd), F_CONTROL_CVT, uintptr(unsafe.Pointer(&cvtreq))); err != nil {
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return nil, nil, err
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}
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p := os.NewFile(uintptr(ptmxfd), "/dev/ptmx")
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if p == nil {
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return nil, nil, err
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}
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// In case of error after this point, make sure we close the ptmx fd.
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defer func() {
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if err != nil {
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_ = p.Close() // Best effort.
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}
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}()
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sname, err := ptsname(ptmxfd)
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if err != nil {
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return nil, nil, err
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}
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_, err = grantpt(ptmxfd)
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if err != nil {
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return nil, nil, err
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}
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if _, err = unlockpt(ptmxfd); err != nil {
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return nil, nil, err
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}
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ptsfd, err := syscall.Open(sname, os.O_RDWR|syscall.O_NOCTTY, 0)
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if err != nil {
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return nil, nil, err
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}
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if _, err = fcntl(uintptr(ptsfd), F_CONTROL_CVT, uintptr(unsafe.Pointer(&cvtreq))); err != nil {
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return nil, nil, err
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}
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t := os.NewFile(uintptr(ptsfd), sname)
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if err != nil {
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return nil, nil, err
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}
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return p, t, nil
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}
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func openpt(oflag int) (fd int, err error) {
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r0, _, e1 := runtime.CallLeFuncWithErr(runtime.GetZosLibVec()+SYS_POSIX_OPENPT<<4, uintptr(oflag))
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fd = int(r0)
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if e1 != 0 {
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err = syscall.Errno(e1)
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}
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return
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}
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func fcntl(fd uintptr, cmd int, arg uintptr) (val int, err error) {
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r0, _, e1 := runtime.CallLeFuncWithErr(runtime.GetZosLibVec()+SYS_FCNTL<<4, uintptr(fd), uintptr(cmd), arg)
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val = int(r0)
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if e1 != 0 {
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err = syscall.Errno(e1)
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}
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return
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}
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func ptsname(fd int) (name string, err error) {
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r0, _, e1 := runtime.CallLeFuncWithPtrReturn(runtime.GetZosLibVec()+SYS___PTSNAME_A<<4, uintptr(fd))
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name = u2s(unsafe.Pointer(r0))
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if e1 != 0 {
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err = syscall.Errno(e1)
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}
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return
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}
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func grantpt(fildes int) (rc int, err error) {
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r0, _, e1 := runtime.CallLeFuncWithErr(runtime.GetZosLibVec()+SYS_GRANTPT<<4, uintptr(fildes))
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rc = int(r0)
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if e1 != 0 {
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err = syscall.Errno(e1)
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}
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return
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}
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func unlockpt(fildes int) (rc int, err error) {
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r0, _, e1 := runtime.CallLeFuncWithErr(runtime.GetZosLibVec()+SYS_UNLOCKPT<<4, uintptr(fildes))
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rc = int(r0)
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if e1 != 0 {
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err = syscall.Errno(e1)
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}
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return
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}
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func u2s(cstr unsafe.Pointer) string {
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str := (*[1024]uint8)(cstr)
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i := 0
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for str[i] != 0 {
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i++
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}
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return string(str[:i])
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}
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