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linux 0.11 ÄÚºËѧϰ read_write.c


/*
 * ¸ÃÎļþʵÏÖϵͳµ÷ÓÃread£¬writeºÍlseek¡£
 */
/*
 *  linux/fs/read_write.c
 *
 *  (C) 1991  Linus Torvalds
 */
#include <sys/stat.h>
#include <errno.h>
#include <sys/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/segment.h>
/* ×Ö·ûÉ豸¶Áдº¯Êý */
extern int rw_char(int rw,int dev, char * buf, int count, off_t * pos);
/* ¶Á¹ÜµÀ²Ù×÷º¯Êý */
extern int read_pipe(struct m_inode * inode, char * buf, int count);
/* д¹ÜµÀ²Ù×÷º¯Êý */
extern int write_pipe(struct m_inode * inode, char * buf, int count);
/* ¿éÉ豸¶Á²Ù×÷º¯Êý */
extern int block_read(int dev, off_t * pos, char * buf, int count);
/* ¿éÉ豸д²Ù×÷º¯Êý */
extern int block_write(int dev, off_t * pos, char * buf, int count);
/* ¶ÁÎļþ²Ù×÷º¯Êý */
extern int file_read(struct m_inode * inode, struct file * filp,
char * buf, int count);
/* дÎļþ²Ù×÷º¯Êý */
extern int file_write(struct m_inode * inode, struct file * filp,
char * buf, int count);
/* ÖØ¶¨Î»Îļþ¶ÁдָÕëϵͳµ÷Óú¯Êý£¬²ÎÊýfdÊÇÎļþ¾ä±ú£¬offsetÊÇеÄÎļþ */
/* ¶ÁÐ´Æ«ÒÆÁ¿£¬originÊÇÆ«ÒÆµÄÆðʼµØÖ·£¬¿ÉÄÜÊÇÏÂÃæµÄÈý¸öÖµ£ºSEEK_SET   */
/* ÎļþµÄ¿ªÊ¼´¦£¬SEEK_CURµ±Ç°µÄ¶ÁдλÖã¬SEEK_ENDÎļþ½áβ´¦           */
int sys_lseek(unsigned int fd,off_t offset, int origin)
{
struct file * file;
int tmp;
// Èç¹ûÎļþ¾ä±úÖµ´óÓÚ³ÌÐò×î¶à´ò¿ªÎļþÊýNR_OPEN(20)£¬»òÕ߸þä±úµÄÎļþ½á¹¹Ö¸ÕëΪ¿Õ£¬»òÕß
// ¶ÔÓ¦Îļþ½á¹¹µÄi ½Úµã×Ö¶ÎΪ¿Õ£¬»òÕßÖ¸¶¨É豸ÎļþÖ¸ÕëÊDz»¿É¶¨Î»µÄ£¬Ôò·µ»Ø³ö´íÂë²¢Í˳ö
if (fd >= NR_OPEN || !(file=current->filp[fd]) || !(file->f_inode)
  || !IS_SEEKABLE(MAJOR(file->f_inode->i_dev)))
return -EBADF;
// Èç¹ûÎļþ¶ÔÓ¦µÄi ½ÚµãÊǹܵÀ½Úµã£¬Ôò·µ»Ø³ö´íÂ룬Í˳ö
if (file->f_inode->i_pipe)
return -ESPIPE;
switch (origin) {
case 0: // SEEK_SET
// ÈôÆ«ÒÆÖµÐ¡ÓÚÁ㣬Ôò³ö´í
if (offset<0) return -EINVAL;
// ÉèÖÃÎļþ¶ÁдָÕëµÈÓÚoffset
file->f_


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