libustcomm/ustcomm.c

   1 #include <sys/types.h>
   2 #include <signal.h>
   3 #include <errno.h>
   4 #include <sys/socket.h>
   5 #include <sys/un.h>
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 #define UNIX_PATH_MAX 108
  11 #define SOCK_DIR "/tmp/socks"
  12 #define UST_SIGNAL SIGIO
  13
  14 static void signal_process(pid_t pid)
  15 {
  16         int result;
  17
  18         result = kill(pid, UST_SIGNAL);
  19         if(result == -1) {
  20                 perror("kill");
  21                 return;
  22         }
  23
  24         sleep(1);
  25 }
  26
  27 int send_message(pid_t pid, const char *msg, const char *reply)
  28 {
  29         int fd;
  30         int result;
  31         struct sockaddr_un addr;
  32         char *buf;
  33
  34         result = fd = socket(PF_UNIX, SOCK_DGRAM, 0);
  35         if(result == -1) {
  36                 perror("socket");
  37                 return 1;
  38         }
  39
  40         addr.sun_family = AF_UNIX;
  41
  42         result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s/%d", SOCK_DIR, pid);
  43         if(result >= UNIX_PATH_MAX) {
  44                 fprintf(stderr, "string overflow allocating socket name");
  45                 return 1;
  46         }
  47
  48         asprintf(&buf, "%s\n", msg);
  49
  50         signal_process(pid);
  51
  52         result = sendto(fd, buf, strlen(buf), 0, (struct sockaddr *)&addr, sizeof(addr));
  53         if(result == -1) {
  54                 perror("sendto");
  55                 return 1;
  56         }
  57
  58         free(buf);
  59
  60         return 0;
  61 }
  62
  63