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52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/*
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* Test shmget/shmat/shmdt posix calls.
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*
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* Copyright (C) 2007 - 2008 Bahadir Balban
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*/
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <tests.h>
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int shmtest(void)
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{
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//key_t keys[2] = { 5, 10000 };
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key_t keys[2] = { 2, 3 };
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void *bases[2] = { 0 , 0 };
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int shmids[2];
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printf("Initiating shmget()\n");
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for (int i = 0; i < 2; i++) {
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if ((shmids[i] = shmget(keys[i], 27, IPC_CREAT | 0666)) < 0) {
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printf("Call failed.\n");
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perror("SHMGET");
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} else
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printf("SHMID returned: %d\n", shmids[i]);
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}
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printf("Now shmat()\n");
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for (int i = 0; i < 2; i++) {
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if ((int)(bases[i] = shmat(shmids[i], NULL, 0)) == -1)
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perror("SHMAT");
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else
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printf("SHM base address returned: %p\n", bases[i]);
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}
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printf("Now shmdt()\n");
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for (int i = 0; i < 2; i++) {
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if (shmdt(bases[i]) < 0)
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perror("SHMDT");
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else
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printf("SHM detached OK.\n");
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}
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printf("Now shmat() again\n");
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for (int i = 0; i < 2; i++) {
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if ((int)(bases[i] = shmat(shmids[i], NULL, 0)) == -1)
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perror("SHMAT");
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else
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printf("SHM base address returned: %p\n", bases[i]);
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}
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return 0;
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}
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