實驗7多進程間的通信

1、實驗7 進程間的通信l 實驗目的：1、 掌握進程間的通信機制，2、 掌握信號3、 掌握共享內(nèi)存、信號量4、 掌握消息隊列l(wèi) 實驗要求：熟練使用該節(jié)所介紹進程間通信的相關(guān)函數(shù)。l 實驗器材：軟件：1.安裝了Ubunt的vmware虛擬機硬件：PC機一臺l 實驗步驟：1、 信號實驗；參考下以關(guān)于信號注冊和信號捕捉的函數(shù)代碼/*signal.c*/#include <stdio.h>#include <unistd.h>#include<signal.h>void f(int sig)printf("catch signal %dn",sig)

2、;int main()int i=0;signal(SIGINT,f);printf("pid=%dn",getpid();while(1)printf("%dn",i+);sleep(1);return 0;編寫一段程序，使用系統(tǒng)調(diào)用函數(shù)fork( )創(chuàng)建兩個子進程，再用系統(tǒng)調(diào)用函數(shù)signal( )讓父進程捕捉信號SIGINT（可以鍵入ctrl+c 來觸發(fā)，也可以用kill 命令來觸發(fā)），當捕捉到中斷信號后，父進程用系統(tǒng)調(diào)用函數(shù)kill( )向兩個子進程發(fā)出信號，子進程捕捉到父進程發(fā)來的信號后，分別輸出下列信息后終止：Child process 1

3、is killed by parent!Child process 2 is killed by parent!參考代碼如下：#include "myhead.h"void f(int sig)kill(p1, SIGUSR1);kill(p2, SIGUSR2);void f1(int sig)printf("p1 catch the signal: %dn", sig);void f2(int sig)printf("p2 catch the signal: %dn", sig);int main(void)pid_t p1, p

4、2;p1 = fork();if(p1 > 0)p2 = fork();if(p2 > 0) / parent/ 告訴內(nèi)核，以后如果SIGINT來了，就去執(zhí)行函數(shù)fsignal(SIGINT, f);pause();else if(p2 = 0) / child 2signal(SIGUSR2, f2);pause();else if(p1 = 0) / child 1signal(SIGUSR1, f1);pause();return 0;2、 用共享內(nèi)存和信號量實現(xiàn)兩個進程間的通信，一個寫進程jack.c，向共享內(nèi)存中寫入數(shù)據(jù)，一個讀進程rose.c從共享內(nèi)存中讀取數(shù)據(jù)。jac

5、k.c的參考代碼如下：#include <stdio.h>#include <errno.h>#include <fcntl.h>#include <sys/types.h>#include <sys/ipc.h>#include <sys/shm.h>#include <strings.h>#include <sys/stat.h>#include <semaphore.h>#define BUFSZ 1024int main(void)key_t key = ftok(".

6、", 1);int shmid = shmget(key, BUFSZ, 0666|IPC_CREAT|IPC_EXCL);if(shmid = -1 && errno = EEXIST)shmid = shmget(key, BUFSZ, 0666);char *shmaddr = shmat(shmid, NULL, 0);bzero(shmaddr, BUFSZ);fgets(shmaddr, BUFSZ, stdin);sem_t *s = sem_open("/mysem", O_CREAT|O_EXCL, 0666, 0);if(s =

7、 SEM_FAILED && errno = EEXIST)s = sem_open("/mysem", 0);sem_post(s);return 0;rose.c的參考代碼如下：#include <stdio.h>#include <fcntl.h>#include <sys/types.h>#include <sys/shm.h>#include <sys/ipc.h>#include <sys/stat.h>#include <errno.h>#include <

8、;semaphore.h>#define BUFSZ 1024int main(void)key_t key = ftok(".", 1);int shmid = shmget(key, BUFSZ, 0666|IPC_CREAT|IPC_EXCL);if(shmid = -1 && errno = EEXIST)shmid = shmget(key, BUFSZ, 0666);char *shmaddr = shmat(shmid, NULL, 0);sem_t *s = sem_open("/mysem", O_CREAT|O_EXCL, 0666, 0);if(s = SEM_FAILED && errno = EEXIST)s = sem_open("/mysem", 0);sem_wait(s);printf("from Jack: %sn", shmaddr);shmctl(shmid, IPC_RMID, NULL);return 0;這個是因為pthread并