//shmdata.h struct shm_st {int flag; //0可讀不可寫,1可寫不可讀char text[BUFSIZ]; };

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//shmwrite.c #include <stdio.h> #include <sys/ipc.h> #include <sys/shm.h> #include "shmdata.h" #include <memory.h>int main() {void* writeAbc;int shmId;shmId = shmget(123, sizeof(struct shm_st), 0666|IPC_CREAT);if(shmId < 0){perror("shmget");return -1;}writeAbc = shmat(shmId, NULL, 0);if((void*)-1 == writeAbc){perror("shmat");return -1;}while(1){if(1 == ((struct shm_st*)writeAbc)->flag){memset(((struct shm_st*)writeAbc)->text, 0, BUFSIZ);printf("please intput content to write to share memory\r\n");scanf("%s", ((struct shm_st*)writeAbc)->text);((struct shm_st*)writeAbc)->flag = 0;if(0 == strcmp("quit", ((struct shm_st*)writeAbc)->text)){break;}}sleep(2);}if(shmdt(writeAbc) < 0){perror("shmdt");return -1;}return 0; }

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//shmread.c #include <stdio.h> #include "shmdata.h" #include <sys/ipc.h> #include <sys/shm.h>int main() {void* readAbc;int shmId;shmId = shmget(123, sizeof(struct shm_st), 0666|IPC_CREAT);if(shmId < 0){perror("shmget");return -1;}readAbc = shmat(shmId, NULL, 0);while(1){if(0 == ((struct shm_st*)readAbc)->flag){printf("%s\r\n", ((struct shm_st*)readAbc)->text);if(0 == strcmp("quit", ((struct shm_st*)readAbc)->text)){break;}((struct shm_st*)readAbc)->flag = 1;}sleep(2);}if(shmdt(readAbc) < 0){perror("shmdt");return -1;}if(shmctl(shmId, IPC_RMID, NULL) < 0){perror("shmctl");return -1;}return 0; }

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