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Merge pull request #201 from MacMalainey/master
add z/OS support
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//go:build !zos | ||
// +build !zos | ||
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package pty | ||
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import ( | ||
"os" | ||
"testing" | ||
) | ||
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func getNonBlockingFile(t *testing.T, file *os.File, path string) *os.File { | ||
t.Helper() | ||
return file | ||
} |
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@@ -0,0 +1,20 @@ | ||
//go:build zos | ||
// +build zos | ||
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package pty | ||
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import ( | ||
"os" | ||
"testing" | ||
) | ||
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func getNonBlockingFile(t *testing.T, file *os.File, path string) *os.File { | ||
t.Helper() | ||
// z/OS doesn't open a pollable FD - fix that here | ||
if _, err := fcntl(uintptr(file.Fd()), F_SETFL, O_NONBLOCK); err != nil { | ||
t.Fatalf("Error: zos-nonblock: %s.\n", err) | ||
} | ||
nf := os.NewFile(file.Fd(), path) | ||
t.Cleanup(func() { _ = nf.Close() }) | ||
return nf | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,141 @@ | ||
//go:build zos | ||
// +build zos | ||
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package pty | ||
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import ( | ||
"os" | ||
"runtime" | ||
"syscall" | ||
"unsafe" | ||
) | ||
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const ( | ||
SYS_UNLOCKPT = 0x37B | ||
SYS_GRANTPT = 0x37A | ||
SYS_POSIX_OPENPT = 0xC66 | ||
SYS_FCNTL = 0x18C | ||
SYS___PTSNAME_A = 0x718 | ||
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SETCVTON = 1 | ||
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O_NONBLOCK = 0x04 | ||
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F_SETFL = 4 | ||
F_CONTROL_CVT = 13 | ||
) | ||
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type f_cnvrt struct { | ||
Cvtcmd int32 | ||
Pccsid int16 | ||
Fccsid int16 | ||
} | ||
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func open() (pty, tty *os.File, err error) { | ||
ptmxfd, err := openpt(os.O_RDWR | syscall.O_NOCTTY) | ||
if err != nil { | ||
return nil, nil, err | ||
} | ||
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// Needed for z/OS so that the characters are not garbled if ptyp* is untagged | ||
cvtreq := f_cnvrt{Cvtcmd: SETCVTON, Pccsid: 0, Fccsid: 1047} | ||
if _, err = fcntl(uintptr(ptmxfd), F_CONTROL_CVT, uintptr(unsafe.Pointer(&cvtreq))); err != nil { | ||
return nil, nil, err | ||
} | ||
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p := os.NewFile(uintptr(ptmxfd), "/dev/ptmx") | ||
if p == nil { | ||
return nil, nil, err | ||
} | ||
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// In case of error after this point, make sure we close the ptmx fd. | ||
defer func() { | ||
if err != nil { | ||
_ = p.Close() // Best effort. | ||
} | ||
}() | ||
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sname, err := ptsname(ptmxfd) | ||
if err != nil { | ||
return nil, nil, err | ||
} | ||
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_, err = grantpt(ptmxfd) | ||
if err != nil { | ||
return nil, nil, err | ||
} | ||
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if _, err = unlockpt(ptmxfd); err != nil { | ||
return nil, nil, err | ||
} | ||
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ptsfd, err := syscall.Open(sname, os.O_RDWR|syscall.O_NOCTTY, 0) | ||
if err != nil { | ||
return nil, nil, err | ||
} | ||
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if _, err = fcntl(uintptr(ptsfd), F_CONTROL_CVT, uintptr(unsafe.Pointer(&cvtreq))); err != nil { | ||
return nil, nil, err | ||
} | ||
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t := os.NewFile(uintptr(ptsfd), sname) | ||
if err != nil { | ||
return nil, nil, err | ||
} | ||
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return p, t, nil | ||
} | ||
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func openpt(oflag int) (fd int, err error) { | ||
r0, _, e1 := runtime.CallLeFuncWithErr(runtime.GetZosLibVec()+SYS_POSIX_OPENPT<<4, uintptr(oflag)) | ||
fd = int(r0) | ||
if e1 != 0 { | ||
err = syscall.Errno(e1) | ||
} | ||
return | ||
} | ||
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func fcntl(fd uintptr, cmd int, arg uintptr) (val int, err error) { | ||
r0, _, e1 := runtime.CallLeFuncWithErr(runtime.GetZosLibVec()+SYS_FCNTL<<4, uintptr(fd), uintptr(cmd), arg) | ||
val = int(r0) | ||
if e1 != 0 { | ||
err = syscall.Errno(e1) | ||
} | ||
return | ||
} | ||
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func ptsname(fd int) (name string, err error) { | ||
r0, _, e1 := runtime.CallLeFuncWithPtrReturn(runtime.GetZosLibVec()+SYS___PTSNAME_A<<4, uintptr(fd)) | ||
name = u2s(unsafe.Pointer(r0)) | ||
if e1 != 0 { | ||
err = syscall.Errno(e1) | ||
} | ||
return | ||
} | ||
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func grantpt(fildes int) (rc int, err error) { | ||
r0, _, e1 := runtime.CallLeFuncWithErr(runtime.GetZosLibVec()+SYS_GRANTPT<<4, uintptr(fildes)) | ||
rc = int(r0) | ||
if e1 != 0 { | ||
err = syscall.Errno(e1) | ||
} | ||
return | ||
} | ||
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func unlockpt(fildes int) (rc int, err error) { | ||
r0, _, e1 := runtime.CallLeFuncWithErr(runtime.GetZosLibVec()+SYS_UNLOCKPT<<4, uintptr(fildes)) | ||
rc = int(r0) | ||
if e1 != 0 { | ||
err = syscall.Errno(e1) | ||
} | ||
return | ||
} | ||
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func u2s(cstr unsafe.Pointer) string { | ||
str := (*[1024]uint8)(cstr) | ||
i := 0 | ||
for str[i] != 0 { | ||
i++ | ||
} | ||
return string(str[:i]) | ||
} |