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Pipeline Communications
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int main(int argc, char **argv) { int pipefds[2],pipefds2[2]; pid_t pid; int i,j; char buffer[255]; If (pipe (pipefds) < 0)//first pipeline { printf("errorn"); } pid=fork(); if(pid<0) exit(1); if (pid==0) { close(pipefds[1]); memset(buffer,0,sizeof(buffer)); while(1) { I=read (pipefds[0],buffer,sizeof (buffer));//if it is empty (preceded by a child process after the fork), then block does not move if(0==i) break; printf("%sn",buffer); } close(pipefds[0]); exit(0); } else { close(pipefds[0]); scanf("%s",buffer); write(pipefds[1],buffer,strlen(buffer)); close(pipefds[1]); wait(NULL); exit(0); } }
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