globalvar_read.c~

来自「Some simple source code to show specific」· C~ 代码 · 共 30 行

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
main()
{
int fd, num;

fd = open("/dev/globalvar", O_RDWR, S_IRUSR | S_IWUSR);
if (fd != - 1)
{
	while (1)
	{
		read(fd, &num, sizeof(int));
		printf("%d\n",num);

		if (num == 0)
		{
			close(fd);
			break;
		}
	}

}
else
{
	printf("device open failure\n");
}
}