diskdata_distribution.c

Solaris下的文件系统编程,sun公司培训用例.

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <ustat.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define BUFFERSZE (64*512)

int main(void)
{
	int file = 0, exit_wait, disk = 0, i = 0;
	char buffer[10] = {0};
	char disk_buffer[BUFFERSZE] = {0}, *disk_buf_pointer;
	char char_separate;
	struct stat stat_buf;
	struct ustat ustat_buf;
	disk_buf_pointer = disk_buffer;
	file = open("test.txt", O_RDONLY);
	disk = open("/dev/rdsk/c1d0s0", O_RDONLY);
	printf("The file descriptor returned is %d\n", file);
	printf("The disk device returned is %d\n", disk);
	if ((file == -1)||(disk == -1))
		{
			printf("The file opening failed. File is %d, disk is %d\n", file, disk);
			exit(0);
		}
	if (fstat(file, &stat_buf) == -1)
		{
			printf("The function fstat error.\n");
			exit(0);
		}
	printf("The Inode number of file test.txt is %d\n", stat_buf.st_ino);
	printf("The device number is %x\n", stat_buf.st_dev);
	if (ustat(stat_buf.st_dev, &ustat_buf) == -1)
		{
			printf("The function ufstat error.\n");
			exit(0);
		}
	printf("The file system name is %s\n", ustat_buf.f_fname);
	read(file, (void*)buffer, 9);
	read(disk, (void*)disk_buf_pointer, BUFFERSZE);
	for (; i < BUFFERSZE; i++)
	{
		if (!(i % 16)) putchar('\n');
		if (!(i % 512)) printf("====================================================================\n");
		char_separate = disk_buffer[i];
		printf("%2x %c\t", char_separate, char_separate);
	}
	putchar('\n');
	(char *)buffer [9] = 0;
	printf("The data read from the file is %s\n", buffer);
	//scanf("%d", &exit_wait);
	close (disk);
	close (file);
	return 0;
}