OL> +int cr_retval_restart(struct cr_ctx *ctx)
OL> +{
OL> + struct pt_regs *regs = task_pt_regs(current);
OL> + int ret = 0;
OL> +
OL> + /*
OL> + * The retval should be either zero if the checkpointed task
OL> + * had been in user-space when frozen, or the retval from the
OL> + * syscall that had been interrupted then.
OL> + *
OL> + * In the latter, if the syscall succeeded (perhaps partially)
OL> + * then the retval is non-negative. If it failed, the error
OL> + * may be one of -ERESTART... gang, interpreted in the signal
OL> + * handling code. In restart it must happen, too.
OL> + *
OL> + * To force execution of the signal handler now, too, we fake
OL> + * a signal to ourselves (a la freeze/thaw) when ret < 0.
OL> + */
OL> +
OL> + /* were we from a system call? if so, get old error/retval */
OL> + if (syscall_get_nr(current, regs) >= 0)
OL> + ret = syscall_get_error(current, regs);
OL> + /* old error ? if so, make sure signal handling kicks in */
OL> + if (ret < 0)
OL> + set_tsk_thread_flag(current, TIF_SIGPENDING);
OL> + return ret;
OL> +}
Does this need to be arch-specific? At first glance, I can't think of
anything I'd need to change for s390, for example.
--
Dan Smith
IBM Linux Technology Center
email: [email protected]
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