?? writetest2.c
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#include <unistd.h>#include <sys/types.h>#include <errno.h>main(int argc,char**argv){ int pipe_fd[2]; pid_t pid; char r_buf[4096]; char w_buf[4096*2]; int writenum; int rnum; memset(r_buf,0,sizeof(r_buf)); if(pipe(pipe_fd)<0) { printf("pipe create error\n"); return -1; } if((pid=fork())==0) { close(pipe_fd[1]); while(1) { sleep(1); rnum=read(pipe_fd[0],r_buf,1000); printf("child: readnum is %d\n",rnum); } close(pipe_fd[0]); exit(); } else if(pid>0) { close(pipe_fd[0]);//write memset(r_buf,0,sizeof(r_buf)); if((writenum=write(pipe_fd[1],w_buf,1024))==-1) printf("write to pipe error\n"); else printf("the bytes write to pipe is %d \n", writenum); writenum=write(pipe_fd[1],w_buf,4096); close(pipe_fd[1]); } }
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