int main(int argc, char **argv)
{
int fd;
sigset_t mask;
/* Make sure std* are open, for suid safety. */
do
fd = open("/dev/null", O_RDONLY);
while (fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO);
close(fd);
/* Block ^Z to prevent holding locks on the attachtab. */
sigemptyset(&mask);
sigaddset(&mask, SIGTSTP);
sigaddset(&mask, SIGTTOU);
sigaddset(&mask, SIGTTIN);
sigprocmask(SIG_BLOCK, &mask, NULL);
if (argc > 1 && !strncmp(argv[1], "-P", 2))
{
whoami = argv[1] + 2;
argv++;
argc--;
}
else
{
whoami = strrchr(argv[0], '/');
if (whoami)
whoami++;
else
whoami = argv[0];
}
if (!strcmp(whoami, "add"))
exit(add_main(argc, argv));
else if (!strcmp(whoami, "attach"))
exit(attach_main(argc, argv));
else if (!strcmp(whoami, "detach"))
exit(detach_main(argc, argv));
else if (!strcmp(whoami, "fsid") || !strcmp(whoami, "nfsid"))
exit(fsid_main(argc, argv));
else if (!strcmp(whoami, "zinit"))
exit(zinit_main(argc, argv));
fprintf(stderr, "Not invoked with attach, detach, nfsid, fsid, zinit, add, or attachandrun!\n");
exit(1);
}
tree_node* alex_parsing(token_list* t_lt)
{
token* tk_p = NULL;
tree_node* r_tn = NULL;
if(t_lt == NULL)
return NULL;
while(tk_p=at_token(t_lt))
{
switch(tk_p->token_type)
{
case token_type_var: // 定义变量
{
r_tn = syn_var_def(t_lt);
if(r_tn)
add_main(r_tn);
else
return NULL;
}
break;
case token_type_ide:
{
r_tn = syn_exp_stmt(t_lt);
if(r_tn)
add_main(r_tn);
else
return NULL;
}
break;
case token_type_using: // 引入dll
{
r_tn = syn_using(t_lt);
if(r_tn)
add_main(r_tn);
else
return NULL;
}
break;
case token_type_func: // 定义函数
{
r_tn = syn_func_def(t_lt);
if(r_tn)
{
if(look_table(global_table, r_tn->b_v.name.s_ptr)==NULL)
{
add_g_table(new_func_st(r_tn->b_v.name.s_ptr));
add_func(r_tn);
}
else
{
print("parsing[erro line %d]: the function %s is redef!\n", tk_p->token_line, r_tn->b_v.name.s_ptr);
free_tree(r_tn);
return NULL;
}
}
else
return NULL;
}
break;
default:
{
print("parsing[error line %d]: not allow token \"%s\" at globle code seg!\n", tk_p->token_line, tk_p->token_name);
next_token(t_lt);
}
free_tree(r_tn);
return NULL;
}
}
return r_tn;
}
