cpuplugd/getopt.c

   1 /*
   2  * Copyright IBM Corp 2007
   3  * Author: Hans-Joachim Picht <hans@linux.vnet.ibm.com>
   4  *
   5  * Linux for System z Hotplug Daemon
   6  *
   7  * This file is used to parse the command line arguments
   8  *
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <getopt.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <fcntl.h>
  27 #include <sys/stat.h>
  28 #include <signal.h>
  29 #include <syslog.h>
  30 #include <limits.h>
  31 #include "cpuplugd.h"
  32
  33 void print_usage(int is_error, char program_name[]);
  34 void print_version();
  35 int foreground;
  36 int debug;
  37 char *configfile;
  38 int cpu_idle_limit;
  39
  40 void parse_options(int argc, char **argv)
  41 {
  42         int config_file_specified = -1;
  43         const struct option long_options[] = {
  44                 { "help", no_argument,       NULL, 'h'},
  45                 { "foreground", no_argument, NULL, 'f' },
  46                 { "config", required_argument, NULL, 'c' },
  47                 { "version", no_argument, NULL, 'v' },
  48                 { "verbose", no_argument, NULL, 'V'   },
  49                 { NULL, 0, NULL, 0}
  50         };
  51
  52         /* dont run without any argument */
  53         if (argc == 0 || argc == 1)
  54                 print_usage(0, argv[0]);
  55         while (optind < argc) {
  56                 int index = -1;
  57                 struct option *opt = 0;
  58                 int result = getopt_long(argc, argv, "hfc:vVm",
  59                         long_options, &index);
  60                 if (result == -1)
  61                         break;          /* end of list */
  62                 switch (result) {
  63                 case 'h':
  64                         print_usage(0, argv[0]);
  65                         break;
  66                 case 'f':
  67                         foreground = 1;
  68                         break;
  69                 case 'c':
  70                         /*
  71                          * this prevents -cbla and enforces the
  72                          * user to specify -c bla
  73                          */
  74                         if (strcmp(argv[optind-1], optarg) == 0) {
  75                                 configfile = optarg;
  76                                 config_file_specified = 1;
  77                         } else {
  78                                 printf("Unrecognized option: %s\n", optarg);
  79                                 exit(1);
  80                         }
  81                         break;
  82                 case 'v':
  83                         print_version();
  84                         break;
  85                 case 'V':
  86                         debug = 1;
  87                         break;
  88                 case 0:
  89                         /* all parameter that do not
  90                            appear in the optstring */
  91                         opt = (struct option *)&(long_options[index]);
  92                         printf("'%s' was specified.",
  93                                opt->name);
  94                         if (opt->has_arg == required_argument)
  95                                 printf("Arg: <%s>", optarg);
  96                         printf("\n");
  97                         break;
  98                 case '?':
  99                         printf("Try '%s' --help' for more information.\n",
 100                                 argv[0]);
 101                         exit(1);
 102                         break;
 103                 case -1:
 104                         /* we also run in this case if no argument was s
 105                          * pecified */
 106                         break;
 107                 default:
 108                         print_usage(0, argv[0]);
 109                 }
 110         }
 111         if (config_file_specified == -1) {
 112                 printf("You have to specify a configuration file!\n");
 113                 printf("Try '%s' --help' for more information.\n", argv[0]);
 114                 exit(1);
 115         }
 116 }