127 lines
2.5 KiB
C
127 lines
2.5 KiB
C
/*
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* NAME
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* shmt01
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*
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* CALLS
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* shmat(2) shmget(2) shmdt(2)
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*
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* ALGORITHM
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* Create and attach a shared memory segment, write to it
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* and then detach the shared memroy twice, the second one will FAIL.
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*
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/utsname.h>
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#include <errno.h>
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/** LTP Port **/
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#include "test.h"
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#include "usctest.h"
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char *TCID="shmt01"; /* Test program identifier. */
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int TST_TOTAL=4; /* Total number of test cases. */
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extern int Tst_count; /* Test Case counter for tst_* routines */
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/**************/
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#define K_1 1024
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int rm_shm(int);
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int main(void)
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{
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register int shmid;
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char *cp;
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key_t key;
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int r;
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errno = 0;
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key = (key_t)getpid() ;
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/*----------------------------------------------------------------*/
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if ((shmid = shmget(key, 16*K_1, IPC_CREAT|0666)) < 0 ) {
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perror("shmget");
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tst_resm(TFAIL, "shmget Failed: shmid = %d, errno = %d\n",
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shmid, errno) ;
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tst_exit() ;
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}
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tst_resm(TPASS, "shmget") ;
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/*----------------------------------------------------------------*/
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/* are we doing with ia64 or arm_arch_4t arch */
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#if defined (__ia64__) || defined (__ARM_ARCH_4T__)
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cp = (char *) shmat(shmid, (void *)NULL, 0);
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#else
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cp = (char *) shmat(shmid, (void *)0x80000, 0);
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#endif
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if (cp == (char *)-1) {
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perror("shmat");
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tst_resm(TFAIL, "shmat Failed: shmid = %d, errno = %d\n",
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shmid, errno) ;
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rm_shm(shmid) ;
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tst_exit() ;
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}
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*cp = '1';
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*(cp+1) = '2';
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tst_resm(TPASS, "shmat") ;
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/*----------------------------------------------------------------*/
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r = shmdt(cp);
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if (r < 0) {
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perror("shmdt");
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tst_resm(TFAIL, "shmdt Failed: shmid = %d, errno = %d\n",
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shmid, errno);
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rm_shm(shmid);
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tst_exit();
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}
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tst_resm(TPASS, "shmdt first time.");
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r = shmdt(cp);
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if (r == 0) {
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perror("shmdt");
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tst_resm(TFAIL, "shmdt Failed: shmid = %d, errno = %d\n",
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shmid, errno);
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rm_shm(shmid);
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tst_exit();
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}
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rm_shm(shmid) ;
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tst_resm(TPASS, "shmdt second time.");
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/*------------------------------------------------------------------*/
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tst_exit() ;
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/*-------------------- THIS LINE IS NOT REACHED -------------------*/
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return(0);
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}
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int rm_shm(shmid)
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int shmid ;
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{
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if (shmctl(shmid, IPC_RMID, NULL) == -1) {
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perror("shmctl");
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tst_resm(TFAIL,
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"shmctl Failed to remove: shmid = %d, errno = %d\n",
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shmid, errno) ;
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tst_exit();
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}
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return(0);
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}
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