test/ipc/shmt/shmt01.c

   1 /*
   2  * NAME
   3  *               shmt01
   4  *
   5  * CALLS
   6  *               shmat(2) shmget(2) shmdt(2)
   7  *
   8  * ALGORITHM
   9  * Create and attach a shared memory segment, write to it
  10  * and then detach the shared memroy twice, the second one will FAIL.
  11  *
  12  */
  13
  14 #include <stdio.h>
  15 #include <sys/types.h>
  16 #include <sys/ipc.h>
  17 #include <sys/shm.h>
  18 #include <sys/utsname.h>
  19 #include <errno.h>
  20
  21 /** LTP Port **/
  22 #include "test.h"
  23 #include "usctest.h"
  24
  25 char *TCID="shmt01";            /* Test program identifier.    */
  26 int TST_TOTAL=4;                /* Total number of test cases. */
  27 extern int Tst_count;           /* Test Case counter for tst_* routines */
  28
  29
  30 /**************/
  31
  32 #define K_1 1024
  33
  34 int rm_shm(int);
  35
  36 int main(void)
  37 {
  38                  register int            shmid;
  39                  char                            *cp;
  40                  key_t                           key;
  41                  int r;
  42
  43                  errno = 0;
  44                  key = (key_t)getpid() ;
  45
  46 /*----------------------------------------------------------------*/
  47
  48
  49                  if ((shmid = shmget(key, 16*K_1, IPC_CREAT|0666)) < 0 ) {
  50                                  perror("shmget");
  51                                  tst_resm(TFAIL, "shmget Failed: shmid = %d, errno = %d\n",
  52                                  shmid, errno) ;
  53                                  tst_exit() ;
  54                  }
  55
  56                  tst_resm(TPASS, "shmget") ;
  57
  58 /*----------------------------------------------------------------*/
  59
  60
  61                  /* are we doing with ia64 or arm_arch_4t arch */
  62 #if defined (__ia64__) || defined (__ARM_ARCH_4T__)
  63                  cp = (char *) shmat(shmid, (void *)NULL, 0);
  64 #else
  65                  cp = (char *) shmat(shmid, (void *)0x80000, 0);
  66 #endif
  67                  if (cp == (char *)-1) {
  68                                  perror("shmat");
  69                                  tst_resm(TFAIL, "shmat Failed: shmid = %d, errno = %d\n",
  70                                  shmid, errno) ;
  71                                  rm_shm(shmid) ;
  72                                  tst_exit() ;
  73                  }
  74
  75                  *cp     = '1';
  76                  *(cp+1) = '2';
  77
  78                  tst_resm(TPASS, "shmat") ;
  79
  80 /*----------------------------------------------------------------*/
  81
  82                  r = shmdt(cp);
  83                  if (r  < 0) {
  84                          perror("shmdt");
  85                          tst_resm(TFAIL, "shmdt Failed: shmid = %d, errno = %d\n",
  86                                          shmid, errno);
  87                          rm_shm(shmid);
  88                          tst_exit();
  89                  }
  90
  91                  tst_resm(TPASS, "shmdt first time.");
  92
  93                  r = shmdt(cp);
  94                  if (r == 0) {
  95                          perror("shmdt");
  96                          tst_resm(TFAIL, "shmdt Failed: shmid = %d, errno = %d\n",
  97                                          shmid, errno);
  98                          rm_shm(shmid);
  99                          tst_exit();
 100                  }
 101
 102                  rm_shm(shmid) ;
 103
 104                  tst_resm(TPASS, "shmdt second time.");
 105
 106 /*------------------------------------------------------------------*/
 107
 108                  tst_exit() ;
 109
 110 /*-------------------- THIS LINE IS NOT REACHED -------------------*/
 111                  return(0);
 112 }
 113
 114 int rm_shm(shmid)
 115 int shmid ;
 116 {
 117                  if (shmctl(shmid, IPC_RMID, NULL) == -1) {
 118                                  perror("shmctl");
 119                                  tst_resm(TFAIL,
 120                                  "shmctl Failed to remove: shmid = %d, errno = %d\n",
 121                                  shmid, errno) ;
 122                                  tst_exit();
 123                  }
 124                  return(0);
 125 }
 126