积累知识，方便自己
分类： C/C++
2013-01-24 12:38:40
/*int pipe(int filedes[2]);无名管道,返回0成功，返回-1失败*/
/*fd[0]为读端，fd[1]为写端，从尾部写头部读*/
#include
#include
#include
#include
#include
#include
#include
#include
/*int pipe(int filedes[2]);无名管道,返回0成功，返回-1失败*/
/*fd[0]为读端，fd[1]为写端，从尾部写头部读*/
/*兄弟进程的无名管道*/
int main(void)
{
pid_t pid = -1;
int ret = -1;
int status = -1;
int fd[2] = {0};
char buf[128] = {0};
int i = 0;
//创建无名管道
ret = pipe(fd);
if(-1 == ret)
{
perror("pipe failed: ");
goto _OUT;
}
//创建子进程
for(i = 0; i < 2; i++)
{
pid = fork();
if(-1 == (ret=pid))
{
perror("fork failed: ");
goto _OUT;
}
? ?
/*i=0则一个子进程写，i=1则另外一个子进程读*/
//子进程写操作
if(0 == pid)
{
if(0 == i)
{
//先关闭读端，以免冲突
close(fd[0]);
//write pipe
memset(buf, 0, sizeof(buf));
ret = write(fd[1], "howaylee", sizeof("howaylee"));
if(-1 == ret)
{
perror("write failed: ");
goto _OUT;
}
}
//子进程写操作
if(1 == i)
{
//先关闭写端，以免冲突
close(fd[1]);
//read pipe
ret = read(fd[0], buf, sizeof(buf));
if(-1 == ret)
{
perror("read failed: ");
goto _OUT;
}
printf("ret=%d buf = %s\n",ret, buf);
}
}
}
if (0 < pid)//父进程等待儿子并读
{
//wait child
wait(&status);
wait(&status);
}
_OUT:
close(fd[0]);
close(fd[1]);
return ret;
}
