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threads_linux.go
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threads_linux.go
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package proctl
import (
"fmt"
sys "golang.org/x/sys/unix"
)
// Not actually used, but necessary
// to be defined.
type OSSpecificDetails interface{}
func (t *ThreadContext) Halt() error {
if stopped(t.Id) {
return nil
}
err := sys.Tgkill(t.Process.Pid, t.Id, sys.SIGSTOP)
if err != nil {
return fmt.Errorf("Halt err %s %d", err, t.Id)
}
_, _, err = wait(t.Id, 0)
if err != nil {
return fmt.Errorf("wait err %s %d", err, t.Id)
}
return nil
}
func (t *ThreadContext) resume() error {
return PtraceCont(t.Id, 0)
}
func (t *ThreadContext) singleStep() error {
err := sys.PtraceSingleStep(t.Id)
if err != nil {
return err
}
_, _, err = wait(t.Id, 0)
return err
}
func (t *ThreadContext) blocked() bool {
// TODO(dp) cache the func pc to remove this lookup
pc, _ := t.CurrentPC()
fn := t.Process.GoSymTable.PCToFunc(pc)
if fn != nil && ((fn.Name == "runtime.futex") || (fn.Name == "runtime.usleep") || (fn.Name == "runtime.clone")) {
return true
}
return false
}
func writeMemory(thread *ThreadContext, addr uintptr, data []byte) (int, error) {
return sys.PtracePokeData(thread.Id, addr, data)
}
func readMemory(thread *ThreadContext, addr uintptr, data []byte) (int, error) {
return sys.PtracePeekData(thread.Id, addr, data)
}