contrib/ntp/util/sht.c

   1 /*
   2  * sht.c - Testprogram for shared memory refclock
   3  * read/write shared memory segment; see usage
   4  */
   5 #ifndef SYS_WINNT
   6 #include <sys/types.h>
   7 #include <sys/ipc.h>
   8 #include <sys/shm.h>
   9 #include <stdio.h>
  10 #include <time.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #else
  14 #include <windows.h>
  15 #include <time.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <iostream.h>
  19 #define sleep(x) Sleep(x*1000)
  20 #endif
  21 #include <assert.h>
  22 struct shmTime {
  23         int    mode; /* 0 - if valid set
  24                       *       use values,
  25                       *       clear valid
  26                       * 1 - if valid set
  27                       *       if count before and after read of values is equal,
  28                       *         use values
  29                       *       clear valid
  30                       */
  31         int    count;
  32         time_t clockTimeStampSec;
  33         int    clockTimeStampUSec;
  34         time_t receiveTimeStampSec;
  35         int    receiveTimeStampUSec;
  36         int    leap;
  37         int    precision;
  38         int    nsamples;
  39         int    valid;
  40 };
  41
  42 struct shmTime *
  43 getShmTime (
  44         int unit
  45         )
  46 {
  47 #ifndef SYS_WINNT
  48         int shmid=shmget (0x4e545030+unit, sizeof (struct shmTime), IPC_CREAT|0777);
  49         if (shmid==-1) {
  50                 perror ("shmget");
  51                 exit (1);
  52         }
  53         else {
  54                 struct shmTime *p=(struct shmTime *)shmat (shmid, 0, 0);
  55                 if ((int)(long)p==-1) {
  56                         perror ("shmat");
  57                         p=0;
  58                 }
  59                 assert (p!=0);
  60                 return p;
  61         }
  62 #else
  63         char buf[10];
  64         LPSECURITY_ATTRIBUTES psec=0;
  65         sprintf (buf,"NTP%d",unit);
  66         SECURITY_DESCRIPTOR sd;
  67         SECURITY_ATTRIBUTES sa;
  68         HANDLE shmid;
  69
  70         assert (InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION));
  71         assert (SetSecurityDescriptorDacl(&sd,1,0,0));
  72         sa.nLength=sizeof (SECURITY_ATTRIBUTES);
  73         sa.lpSecurityDescriptor=&sd;
  74         sa.bInheritHandle=0;
  75         shmid=CreateFileMapping ((HANDLE)0xffffffff, 0, PAGE_READWRITE,
  76                                  psec, sizeof (struct shmTime),buf);
  77         if (!shmid) {
  78                 shmid=CreateFileMapping ((HANDLE)0xffffffff, 0, PAGE_READWRITE,
  79                                          0, sizeof (struct shmTime),buf);
  80                 cout <<"CreateFileMapping with psec!=0 failed"<<endl;
  81         }
  82
  83         if (!shmid) {
  84                 char mbuf[1000];
  85                 FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM,
  86                                0, GetLastError (), 0, mbuf, sizeof (mbuf), 0);
  87                 int x=GetLastError ();
  88                 cout <<"CreateFileMapping "<<buf<<":"<<mbuf<<endl;
  89                 exit (1);
  90         }
  91         else {
  92                 struct shmTime *p=(struct shmTime *) MapViewOfFile (shmid,
  93                                                                     FILE_MAP_WRITE, 0, 0, sizeof (struct shmTime));
  94                 if (p==0) {
  95                         char mbuf[1000];
  96                         FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM,
  97                                        0, GetLastError (), 0, mbuf, sizeof (mbuf), 0);
  98                         cout <<"MapViewOfFile "<<buf<<":"<<mbuf<<endl;
  99                         exit (1);
 100                 }
 101                 return p;
 102         }
 103         return 0;
 104 #endif
 105 }
 106
 107
 108 int
 109 main (
 110         int argc,
 111         char *argv[]
 112         )
 113 {
 114         volatile struct shmTime *p=getShmTime(2);
 115         if (argc<=1) {
 116                 printf ("usage: %s r[c][l]|w|snnn\n",argv[0]);
 117                 printf ("       r read shared memory\n");
 118                 printf ("        c clear valid-flag\n");
 119                 printf ("        l loop (so, rcl will read and clear in a loop\n");
 120                 printf ("       w write shared memory with current time\n");
 121                 printf ("       snnnn set nsamples to nnn\n");
 122                 printf ("       lnnnn set leap to nnn\n");
 123                 printf ("       pnnnn set precision to -nnn\n");
 124                 exit (0);
 125         }
 126         switch (argv[1][0]) {
 127             case 's': {
 128                     p->nsamples=atoi(&argv[1][1]);
 129             }
 130             break;
 131             case 'l': {
 132                     p->leap=atoi(&argv[1][1]);
 133             }
 134             break;
 135             case 'p': {
 136                     p->precision=-atoi(&argv[1][1]);
 137             }
 138             break;
 139             case 'r': {
 140                     char *ap=&argv[1][1];
 141                     int clear=0;
 142                     int loop=0;
 143                     printf ("reader\n");
 144                     while (*ap) {
 145                             switch (*ap) {
 146                                 case 'l' : loop=1; break;
 147                                 case 'c' : clear=1; break;
 148                             }
 149                             ap++;
 150                     }
 151                     do {
 152                             printf ("mode=%d, count=%d, clock=%d.%d, rec=%d.%d,\n",
 153                                     p->mode,p->count,p->clockTimeStampSec,p->clockTimeStampUSec,
 154                                     p->receiveTimeStampSec,p->receiveTimeStampUSec);
 155                             printf ("  leap=%d, precision=%d, nsamples=%d, valid=%d\n",
 156                                     p->leap, p->precision, p->nsamples, p->valid);
 157                             if (!p->valid)
 158                                 printf ("***\n");
 159                             if (clear) {
 160                                     p->valid=0;
 161                                     printf ("cleared\n");
 162                             }
 163                             if (loop)
 164                                 sleep (1);
 165                     } while (loop);
 166             }
 167             break;
 168             case 'w': {
 169                     printf ("writer\n");
 170                     p->mode=0;
 171                     if (!p->valid) {
 172                             p->clockTimeStampSec=time(0)-20;
 173                             p->clockTimeStampUSec=0;
 174                             p->receiveTimeStampSec=time(0)-1;
 175                             p->receiveTimeStampUSec=0;
 176                             printf ("%d %d\n",p->clockTimeStampSec, p->receiveTimeStampSec);
 177                             p->valid=1;
 178                     }
 179                     else {
 180                             printf ("p->valid still set\n"); /* not an error! */
 181                     }
 182             }
 183             break;
 184         }
 185 }