linux系統編程之管道實現父系處理序間通訊__區塊鏈

#include <stdio.h>#include <string.h>#include <unistd.h>#include <sys/types.h>int main(void){int pipefd[2]  = {-1};int ret = pipe(pipefd);int iSign = 0;char caMsg[32] = {'\0'};pid_t pid = fork();if(ret == -1){perror("no name pipe..");//eixt(2);}else if(pid > 0){while(1){if(0 == iSign){printf("father send message:");gets(caMsg);//close(pipefd[0]);write(pipefd[1],caMsg,strlen(caMsg) + 1);iSign = 1;}else if(1 == iSign){read(pipefd[0],caMsg,sizeof(caMsg));printf("child say:%s\n",caMsg);iSign = 0;}sleep(2);}}else if(pid == 0){while(1){if(1 == iSign){printf("child send message:");gets(caMsg);write(pipefd[1],caMsg,sizeof(caMsg));iSign = 0;}else if(0 == iSign){read(pipefd[0],caMsg,sizeof(caMsg));printf("father say:%s\n",caMsg);iSign = 1;}sleep(2);}}printf("hello nidaye\n");return 0;}