apps/rc/helper.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <rpc.h>
  20 #include <stdio.h>
  21 #include <unistd.h>
  22
  23 #include "helper.h"
  24
  25 int get_runlevel(void) {
  26   return rpc_call("init_get_runlevel",0);
  27 }
  28
  29 int str_to_runlevel(const char *str) {
  30   if (str[0]==0) return -1;
  31   if (str[1]!=0) return -1;
  32   char chr = str[0];
  33
  34   if (chr>='0' && chr<'7') return chr-'0';
  35   else return -1;
  36 }
  37
  38 char *rcd_path(int runlevel) {
  39   static char *path = "/etc/init.d/rcX.d\n";
  40   path[14] = '0'+runlevel;
  41   return path;
  42 }
  43
  44 void parse_rc_script(rc_script_t *script,const char *dir,const char *file) {
  45   char *name;
  46   asprintf(&(script->path),"%s/%s",dir,file);
  47   script->priority = strtoul(file+1,&name,10);
  48   script->name = strdup(name);
  49 }
  50
  51 int compare_rc_script(const void *vscript1,const void *vscript2) {
  52   const rc_script_t *script1 = vscript1;
  53   const rc_script_t *script2 = vscript2;
  54
  55   if (script1->name==NULL) return 1;
  56   else if (script2->name==NULL) return -1;
  57   else return script1->priority-script2->priority;
  58 }
  59
  60 int make_rc_symlink(const char *name,int runlevel,int priority,char prefix) {
  61   char *link;
  62   char *target;
  63
  64   asprintf(&link,"%s/%c%02d%s",rcd_path(runlevel),prefix,priority,name);
  65   asprintf(&target,"/etc/init.d/%s",name);
  66
  67   int ret = symlink(target,link);
  68
  69   free(link);
  70   free(target);
  71
  72   return ret;
  73 }