tools/kvm/builtin-pause.c

   1 #include <kvm/util.h>
   2 #include <kvm/kvm-cmd.h>
   3 #include <kvm/builtin-pause.h>
   4 #include <kvm/kvm.h>
   5 #include <kvm/parse-options.h>
   6
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <signal.h>
  10
  11 static bool all;
  12 static pid_t instance_pid;
  13 static const char *instance_name;
  14
  15 static const char * const pause_usage[] = {
  16         "kvm pause [--all] [-n name] [-p pid]",
  17         NULL
  18 };
  19
  20 static const struct option pause_options[] = {
  21         OPT_GROUP("General options:"),
  22         OPT_BOOLEAN('a', "all", &all, "Pause all instances"),
  23         OPT_STRING('n', "name", &instance_name, "name", "Instance name"),
  24         OPT_INTEGER('p', "pid", &instance_pid, "Instance pid"),
  25         OPT_END()
  26 };
  27
  28 static void parse_pause_options(int argc, const char **argv)
  29 {
  30         while (argc != 0) {
  31                 argc = parse_options(argc, argv, pause_options, pause_usage,
  32                                 PARSE_OPT_STOP_AT_NON_OPTION);
  33                 if (argc != 0)
  34                         kvm_pause_help();
  35         }
  36 }
  37
  38 void kvm_pause_help(void)
  39 {
  40         usage_with_options(pause_usage, pause_options);
  41 }
  42
  43 static int do_pause(const char *name, int pid)
  44 {
  45         return kill(pid, SIGUSR2);
  46 }
  47
  48 int kvm_cmd_pause(int argc, const char **argv, const char *prefix)
  49 {
  50         parse_pause_options(argc, argv);
  51
  52         if (all)
  53                 return kvm__enumerate_instances(do_pause);
  54
  55         if (instance_name == NULL &&
  56             instance_pid == 0)
  57                 kvm_pause_help();
  58
  59         if (instance_name)
  60                 instance_pid = kvm__get_pid_by_instance(instance_name);
  61
  62         if (instance_pid <= 0)
  63                 die("Failed locating instance");
  64
  65         return kill(instance_pid, SIGUSR2);
  66 }