kaguya
36 lines
793 B
C
36 lines
793 B
C
#include <sys/shm.h>
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#include <assert.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <time.h>
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int main(void) {
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size_t page_size = getpagesize();
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srand(time(NULL));
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int shmid = -1;
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for (int i = 0; i < 10; i++) {
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shmid = shmget((key_t)rand(), page_size, 0644 | IPC_CREAT | IPC_EXCL);
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if (shmid != -1) {
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break;
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}
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}
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assert(shmid != -1);
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struct shmid_ds buf;
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assert(shmctl(shmid, IPC_STAT, &buf) >= 0);
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assert((size_t)buf.shm_segsz == page_size);
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assert(buf.shm_cpid == getpid());
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void *attach_addr = shmat(shmid, NULL, SHM_RDONLY);
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assert(attach_addr != NULL);
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assert(shmctl(shmid, IPC_RMID, &buf) >= 0);
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assert(shmdt(attach_addr) == 0);
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return 0;
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}
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