mini210的串口驱动的应用程序(2)

return 0;

}

int fifo_create(const char *fifo_name) //创建管道

{

char sys_str[50];

sprintf(sys_str, "rm -rf %s", fifo_name);

/* Remove old fifos */

system(sys_str);

if((mkfifo(fifo_name, 0777) < 0) && (errno != EEXIST))

{

fprintf(stderr, "cannot create fifo\n");

return -1;

}

return 0;

}

int fifo_rd_open(const char *fifo_name)

{

int fd;

fd = open(fifo_name, O_RDWR | O_NONBLOCK);

if (fd == -1)

{

fprintf(stderr, "pthread_attr_setdetachstate() failed (errno = %d)\n", errno)。fprintf(stderr, "pthread_attr_setscope() failed (errno = %d)\n", errno)。fprintf(stderr, "pthread_attr_destroy() failed (errno = %d)\n", errno)。

}

return fd;

}

int fifo_wr_open(const char *fifo_name)

{

int fd;

fd = open(fifo_name, O_RDWR);

if (fd == -1)

{

fprintf(stderr, "pthread_attr_init() failed (errno = %d)\n", errno)。fprintf(stderr, "pthread_attr_setdetachstate() failed (errno = %d)\n", errno)。fprintf(stderr, "pthread_attr_setscope() failed (errno = %d)\n", errno)。

}

return fd;

}

/*

下面几个函数是内核驱动函数的poll函数对应的select函数

uart驱动对应一个select

管道对应一个select，当管道有数据时，会调用对应select的回调函数

*/

int select_init(fd_list_t *fd_list)

{

fd_list->fd_num = 0;

fd_list->fd_max = 0;

FD_ZERO(&fd_list->readset);

}

int select_add_fd(fd_list_t *fd_list, int fd, fd_cb_t cb)

{

if (fd > 0)

{

fd_list->fds[fd_list->fd_num].fd = fd;

fd_list->fds[fd_list->fd_num].cb = cb;

fd_list->fd_num++;

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FD_SET(fd, &(fd_list->readset));

}

return fd_list->fd_num - 1;

}

int select_wait(fd_list_t *fd_list)

{

int rc, i;

FD_ZERO(&fd_list->readset);

for (i=0; i<fd_list->fd_num; i++)

{

if (fd_list->fds[i].fd > 0)

{

FD_SET(fd_list->fds[i].fd, &(fd_list->readset));

}

}

if (fd_list->tv.tv_sec == 0)

rc = select(fd_list->fd_max+1, &(fd_list->readset), (void *)0, (void *)0, (void *)0);

else

rc = select(fd_list->fd_max+1, &(fd_list->readset), (void *)0, (void *)0, &fd_list->tv);

//printf("select get rc:%d\n", rc);

if (rc > 0)

{

for (i=0; i<fd_list->fd_num; i++)

{

if (FD_ISSET(fd_list->fds[i].fd, &(fd_list->readset)))

{

// printf("select get fd:%d\n", fd_list->fds[i].fd);

if (fd_list->fds[i].cb)

{

void search(node *x.rchild=b->,a[i]=a[i-1],a[0]：%s\。 fds[1].fd=fd。ie=gb2312&bs=%d5%e6%c8%fd%b9%fa%ce%de%cb%ab3%c8%e7%ba%ce%c9%be%b3%fd%d7%d4%c9%e8%ce%e4%bd%ab%3f&sr=&z=&cl=3&f=8&wd=ps2%b9%d6%ce%ef%c1%d4%c8%cb2%ce%e4%c6%f7%c8%ab%b9%a5%c2%d4&ct=0。

}

break;

}

}

}

else if (rc == 0)

{

if (fd_list->timeout_cb != NULL)

{

fd_list->timeout_cb(NULL);

}

}

else

{

printf("select return error:%d\n", errno);

}

return rc;

}

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