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Merge pull request #4339 from greatroar/ioctl

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backend, termstatus: fix ioctl calls for 64-bit big-endian platforms
This commit is contained in:
Michael Eischer 2023-05-26 19:34:14 +02:00 committed by GitHub
commit 658aa4c0f7
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2 changed files with 17 additions and 17 deletions
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26
internal/backend/foreground_unix.go
View File

@ -7,21 +7,17 @@ import (
"os"
"os/exec"
"os/signal"
"syscall"
"unsafe"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/errors"
"golang.org/x/sys/unix"
)
func tcsetpgrp(fd int, pid int) error {
_, _, errno := syscall.RawSyscall(syscall.SYS_IOCTL, uintptr(fd),
uintptr(syscall.TIOCSPGRP), uintptr(unsafe.Pointer(&pid)))
if errno == 0 {
return nil
}
return errno
// IoctlSetPointerInt silently casts to int32 internally,
// so this assumes pid fits in 31 bits.
return unix.IoctlSetPointerInt(fd, unix.TIOCSPGRP, pid)
}
func startForeground(cmd *exec.Cmd) (bg func() error, err error) {
@ -35,11 +31,11 @@ func startForeground(cmd *exec.Cmd) (bg func() error, err error) {
return bg, cmd.Start()
}
signal.Ignore(syscall.SIGTTIN)
signal.Ignore(syscall.SIGTTOU)
signal.Ignore(unix.SIGTTIN)
signal.Ignore(unix.SIGTTOU)
// run the command in its own process group
cmd.SysProcAttr = &syscall.SysProcAttr{
cmd.SysProcAttr = &unix.SysProcAttr{
Setpgid: true,
}
@ -51,7 +47,7 @@ func startForeground(cmd *exec.Cmd) (bg func() error, err error) {
}
// move the command's process group into the foreground
prev := syscall.Getpgrp()
prev := unix.Getpgrp()
err = tcsetpgrp(int(tty.Fd()), cmd.Process.Pid)
if err != nil {
_ = tty.Close()
@ -59,8 +55,8 @@ func startForeground(cmd *exec.Cmd) (bg func() error, err error) {
}
bg = func() error {
signal.Reset(syscall.SIGTTIN)
signal.Reset(syscall.SIGTTOU)
signal.Reset(unix.SIGTTIN)
signal.Reset(unix.SIGTTOU)
// reset the foreground process group
err = tcsetpgrp(int(tty.Fd()), prev)

8
internal/ui/termstatus/background_linux.go
View File

@ -18,6 +18,10 @@ func IsProcessBackground(fd uintptr) bool {
}
func isProcessBackground(fd uintptr) (bool, error) {
pid, err := unix.IoctlGetInt(int(fd), unix.TIOCGPGRP)
return pid != unix.Getpgrp(), err
// We need to use IoctlGetUint32 here, because pid_t is 32-bit even on
// 64-bit Linux. IoctlGetInt doesn't work on big-endian platforms:
// https://github.com/golang/go/issues/45585
// https://github.com/golang/go/issues/60429
pid, err := unix.IoctlGetUint32(int(fd), unix.TIOCGPGRP)
return int(pid) != unix.Getpgrp(), err
}