debug.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <fcntl.h>
  18 #include <regex.h>
  19 #include <unistd.h>
  20
  21 #include "procd.h"
  22
  23 unsigned int debug = 0;
  24
  25 void debug_init(void)
  26 {
  27         char line[256];
  28         int r, fd = open("/proc/cmdline", O_RDONLY);
  29         regex_t pat_cmdline;
  30         regmatch_t matches[2];
  31
  32         if (fd < 0)
  33                 return;
  34
  35         r = read(fd, line, sizeof(line) - 1);
  36         line[r] = '\0';
  37         close(fd);
  38
  39         regcomp(&pat_cmdline, "init_debug=([0-9]+)", REG_EXTENDED);
  40         if (!regexec(&pat_cmdline, line, 2, matches, 0)) {
  41                 line[matches[1].rm_eo] = '\0';
  42                 debug = atoi(&line[matches[1].rm_so]);
  43         }
  44         regfree(&pat_cmdline);
  45 }