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ctl.c

/*
  Copyright (C) 2008, 2009, 2010 Jiri Olsa <olsajiri@gmail.com>

  This file is part of the latrace.

  The latrace is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  The latrace is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with the latrace (file COPYING).  If not, see 
  <http://www.gnu.org/licenses/>.
*/


#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>

#include "config.h"


static void usage() NORETURN;
static void usage()
{
      printf("usage: latrace-ctl [-d] config\n\n");
      printf("    -d <0/1>  - disable/enable auditing\n");
      printf("\n");

      exit(1);
}

static int mmap_config(struct lt_config_ctl *cfg)
{
      struct lt_config_shared* sh;
      int page = sysconf(_SC_PAGE_SIZE);
      int fd, len;

      if (-1 == (fd = open(cfg->config, O_RDWR))) {
            perror("open failed");
            return -1;
      }

      /* align the shared config length */
      len = sizeof(struct lt_config_shared);
      len = (len + page) & ~(page - 1);

      sh = mmap(NULL, len,
            PROT_READ | PROT_WRITE,
            MAP_SHARED, fd, 0);

      if ((void *) -1 == sh) {
            PRINT_VERBOSE(cfg, 1,
                  "mmap failed: %s\n", strerror(errno));
            return -1;
      }

      cfg->sh = sh;
      return 0;
}

static int config_ctl(struct lt_config_ctl *cfg, int argc, char **argv)
{
      memset(cfg, 0x0, sizeof(*cfg));

      while (1) {
            int c;
            int option_index = 0;
            static struct option long_options[] = {
                  {"disable", required_argument, 0, 'd'},
                  {"help", no_argument, 0, 'h'},
                  {0, 0, 0, 0}
            };

            c = getopt_long(argc, argv, "+d:",
                        long_options, &option_index);

            if (c == -1)
                  break;

            switch (c) {
            case 'd':
                  cfg->set_disabled = 1;
                  cfg->disabled = atoi(optarg);
                  break;
            }; /* switch */
      } /* while */

      if (optind < argc)
            cfg->config = argv[optind];
      else {
            printf("failed: no config specified\n");
            usage();
      }

      return 0;
}

int main_ctl(int argc, char **argv)
{
      struct lt_config_ctl cfg;

      if (config_ctl(&cfg, argc, argv))
            return -1;

      if (mmap_config(&cfg))
            return -1;

      printf("controling config %s\n", cfg.config);

      if (cfg.set_disabled) {
            printf(" -> disabled = %d\n", cfg.disabled);
            lt_sh(&cfg, disabled) = cfg.disabled;
      }

      return 0;
}

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