查看linux共享内存大小

ipcs -m

#include <stdio.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/shm.h>

#define SHM_SIZE 1024

int main() {
    int shmid;
    char *shmaddr;

    // 创建共享内存段
    shmid = shmget(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | 0666);
    if (shmid == -1) {
        perror("shmget");
        exit(1);
    }

    // 将共享内存段附加到进程地址空间
    shmaddr = (char *)shmat(shmid, NULL, 0);
    if (shmaddr == (char *)-1) {
        perror("shmat");
        exit(1);
    }

    // 写入数据到共享内存
    sprintf(shmaddr, "Hello, Shared Memory!");

    // 从共享内存读取数据
    printf("Data in shared memory: %s\n", shmaddr);

    // 分离共享内存段
    if (shmdt(shmaddr) == -1) {
        perror("shmdt");
        exit(1);
    }

    // 删除共享内存段
    if (shmctl(shmid, IPC_RMID, NULL) == -1) {
        perror("shmctl");
        exit(1);
    }

    return 0;
}