src/protocols/zephyr/ZhmStat.c

   1 /* This file is part of the Project Athena Zephyr Notification System.
   2  * It contains the ZhmStat() function.
   3  *
   4  *      Created by:     Marc Horowitz
   5  *
   6  *      $Id: ZhmStat.c 2432 2001-10-03 19:38:28Z warmenhoven $
   7  *
   8  *      Copyright (c) 1996 by the Massachusetts Institute of Technology.
   9  *      For copying and distribution information, see the file
  10  *      "mit-copyright.h".
  11  */
  12
  13 #include <internal.h>
  14 #include <sys/socket.h>
  15
  16 #ifndef INADDR_LOOPBACK
  17 #define INADDR_LOOPBACK 0x7f000001
  18 #endif
  19
  20 Code_t ZhmStat(hostaddr, notice)
  21     struct in_addr *hostaddr;
  22     ZNotice_t *notice;
  23 {
  24     struct servent *sp;
  25     struct sockaddr_in sin;
  26     ZNotice_t req;
  27     Code_t code;
  28     struct timeval tv;
  29     fd_set readers;
  30
  31     (void) memset((char *)&sin, 0, sizeof(struct sockaddr_in));
  32
  33     sp = getservbyname(HM_SVCNAME, "udp");
  34
  35     sin.sin_port = (sp) ? sp->s_port : HM_SVC_FALLBACK;
  36     sin.sin_family = AF_INET;
  37
  38     if (hostaddr)
  39         sin.sin_addr = *hostaddr;
  40     else
  41         sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  42
  43     (void) memset((char *)&req, 0, sizeof(req));
  44     req.z_kind = STAT;
  45     req.z_port = 0;
  46     req.z_class = HM_STAT_CLASS;
  47     req.z_class_inst = HM_STAT_CLIENT;
  48     req.z_opcode = HM_GIMMESTATS;
  49     req.z_sender = "";
  50     req.z_recipient = "";
  51     req.z_default_format = "";
  52     req.z_message_len = 0;
  53
  54     if ((code = ZSetDestAddr(&sin)) != ZERR_NONE)
  55         return(code);
  56
  57     if ((code = ZSendNotice(&req, ZNOAUTH)) != ZERR_NONE)
  58         return(code);
  59
  60     /* Wait up to ten seconds for a response. */
  61     FD_ZERO(&readers);
  62     FD_SET(ZGetFD(), &readers);
  63     tv.tv_sec = 10;
  64     tv.tv_usec = 0;
  65     code = select(ZGetFD() + 1, &readers, NULL, NULL, &tv);
  66     if (code < 0 && errno != EINTR)
  67         return(errno);
  68     if (code == 0 || (code < 0 && errno == EINTR) || ZPending() == 0)
  69         return(ZERR_HMDEAD);
  70
  71     return(ZReceiveNotice(notice, (struct sockaddr_in *) 0));
  72 }