44 lines
895 B
C
44 lines
895 B
C
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// 共享内存
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#include <sys/shm.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <string.h>
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// 共享内存写数据
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int main()
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{
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key_t key = ftok("/", 28);
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// 获取共享内存的标识
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int shmid = shmget(key, 32, IPC_CREAT | 0666);
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if (shmid == -1)
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{
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perror("shmget");
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return 1;
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}
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printf("shmid=%d\n", shmid);
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// 获取共享内存的首地址
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char *buf = shmat(shmid, NULL, 0); // NULL表示让系统自动分配共享内存的首地址
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if (buf == (char *)-1)
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{
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perror("shmat");
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return 1;
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}
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strcpy(buf, "hi, shared memory");
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printf("write data ok\n");
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/*
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// 删除共享内存
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int ret = shmctl(shmid, IPC_RMID, NULL); // 删除共享内存
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if (ret == -1)
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{
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perror("shmctl");
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return 1;
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}
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printf("shared memory deleted\n");
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*/
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return 0;
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}
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