LINUX 下，编程自学五：msg,mem,pipe通信

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msg.c

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<sys/ipc.h>#include<sys/shm.h>#include<sys/types.h>int main(int argc,char *argv[]){int shmsid;pid_tpid;key_tkey;char*addr;//creat shmkey = IPC_PRIVATE;shmsid = shmget(key,1024,IPC_CREAT|0660);if(shmsid < 0){perror("shmget");return -1;}addr = (char *)shmat(shmsid,NULL,0);/*if(addr = (char*)(-1)){perror("shmat");return -1;}*/printf("create share memeory add :%08x\n",addr);strcpy(addr,"this is share memory");pid = fork();if(pid < 0){perror("fork");return -1;}if(pid == 0){printf("here is child process,read shm:%s\n",addr);}else{wait(NULL);printf("here is parent process,read shm:%s\n",addr);system("ipcs -m");//delete shmif(shmdt(addr) < 0){perror("shmdt");return -1;}if(shmctl(shmsid,IPC_RMID,NULL) < 0){perror("shmctl");return -1;}printf("delete sucess\n");}return 0;}

pipe.c

#include<stdio.h>#include<unistd.h>#include<string.h>#include<stdlib.h>#define MAX_SIZE 128int main(int argc,char *argv[]){intfd[2];pid_tpid;charmessage[MAX_SIZE];memset(message,0,sizeof(message));if(pipe(fd) < 0){perror("pipe");return -1;}pid = fork();if(pid < 0){perror("fork");return -1;}if(pid == 0){close(fd[0]);printf("Here is Child Process,wile be written\n");write(fd[1],"I'm child!!",15);}else{close(fd[1]);printf("Here is Parent Process ,wile be read\n");read(fd[0],message,15);printf("message = %s\n",message);}return 0;}

sharemem.c

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<sys/ipc.h>#include<sys/shm.h>#include<sys/types.h>int main(int argc,char *argv[]){int shmsid;pid_tpid;key_tkey;char*addr;//creat shmkey = IPC_PRIVATE;shmsid = shmget(key,1024,IPC_CREAT|0660);if(shmsid < 0){perror("shmget");return -1;}addr = (char *)shmat(shmsid,NULL,0);/*if(addr = (char*)(-1)){perror("shmat");return -1;}*/printf("create share memeory add :%08x\n",addr);strcpy(addr,"this is share memory");pid = fork();if(pid < 0){perror("fork");return -1;}if(pid == 0){printf("here is child process,read shm:%s\n",addr);}else{wait(NULL);printf("here is parent process,read shm:%s\n",addr);system("ipcs -m");//delete shmif(shmdt(addr) < 0){perror("shmdt");return -1;}if(shmctl(shmsid,IPC_RMID,NULL) < 0){perror("shmctl");return -1;}printf("delete sucess\n");}return 0;}

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