qemu-storage-daemon.c

   1 /*
   2  * QEMU storage daemon
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2019 Kevin Wolf <kwolf@redhat.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27
  28 #include <getopt.h>
  29
  30 #include "block/block.h"
  31 #include "crypto/init.h"
  32
  33 #include "qapi/error.h"
  34 #include "qemu-common.h"
  35 #include "qemu-version.h"
  36 #include "qemu/config-file.h"
  37 #include "qemu/error-report.h"
  38 #include "qemu/log.h"
  39 #include "qemu/main-loop.h"
  40 #include "qemu/module.h"
  41
  42 #include "trace/control.h"
  43
  44 static void help(void)
  45 {
  46     printf(
  47 "Usage: %s [options]\n"
  48 "QEMU storage daemon\n"
  49 "\n"
  50 "  -h, --help             display this help and exit\n"
  51 "  -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
  52 "                         specify tracing options\n"
  53 "  -V, --version          output version information and exit\n"
  54 "\n"
  55 QEMU_HELP_BOTTOM "\n",
  56     error_get_progname());
  57 }
  58
  59 static void process_options(int argc, char *argv[])
  60 {
  61     int c;
  62
  63     static const struct option long_options[] = {
  64         {"help", no_argument, NULL, 'h'},
  65         {"trace", required_argument, NULL, 'T'},
  66         {"version", no_argument, NULL, 'V'},
  67         {0, 0, 0, 0}
  68     };
  69
  70     /*
  71      * In contrast to the system emulator, options are processed in the order
  72      * they are given on the command lines. This means that things must be
  73      * defined first before they can be referenced in another option.
  74      */
  75     while ((c = getopt_long(argc, argv, "hT:V", long_options, NULL)) != -1) {
  76         switch (c) {
  77         case '?':
  78             exit(EXIT_FAILURE);
  79         case 'h':
  80             help();
  81             exit(EXIT_SUCCESS);
  82         case 'T':
  83             {
  84                 char *trace_file = trace_opt_parse(optarg);
  85                 trace_init_file(trace_file);
  86                 g_free(trace_file);
  87                 break;
  88             }
  89         case 'V':
  90             printf("qemu-storage-daemon version "
  91                    QEMU_FULL_VERSION "\n" QEMU_COPYRIGHT "\n");
  92             exit(EXIT_SUCCESS);
  93         default:
  94             g_assert_not_reached();
  95         }
  96     }
  97     if (optind != argc) {
  98         error_report("Unexpected argument: %s", argv[optind]);
  99         exit(EXIT_FAILURE);
 100     }
 101 }
 102
 103 int main(int argc, char *argv[])
 104 {
 105 #ifdef CONFIG_POSIX
 106     signal(SIGPIPE, SIG_IGN);
 107 #endif
 108
 109     error_init(argv[0]);
 110     qemu_init_exec_dir(argv[0]);
 111
 112     module_call_init(MODULE_INIT_QOM);
 113     module_call_init(MODULE_INIT_TRACE);
 114     qemu_add_opts(&qemu_trace_opts);
 115     qcrypto_init(&error_fatal);
 116     bdrv_init();
 117
 118     if (!trace_init_backends()) {
 119         return EXIT_FAILURE;
 120     }
 121     qemu_set_log(LOG_TRACE);
 122
 123     qemu_init_main_loop(&error_fatal);
 124     process_options(argc, argv);
 125
 126     return EXIT_SUCCESS;
 127 }