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carg.slave = slave;

carg.slavename = SlaveName;

errbuf[0] = '\0';

pid = rb_fork_async_signal_safe(&status, chfunc, &carg, Qnil, errbuf, sizeof(errbuf));

if (pid < 0) {

rb_sys_fail(errbuf[0] ? errbuf : "fork failed");

}

close(slave);

rb_execarg_parent_end(carg.execarg_obj);

info->child_pid = pid;