参照do_execve函数实现execve2调用的do_execve2函数，不发生缺页故障

exec.c

@@ -524,9 +524,9 @@ restart_interp:
 	eip[0] = ex.a_entry;		/* eip, magic happens :-) */
 	eip[3] = p;			/* stack pointer */
 	
-	char* buffer;
+	char* tmp_buf;
-	for(buffer=0;buffer<=current->brk;buffer+=4096)
+	for(tmp_buf=0;tmp_buf<=current->brk;tmp_buf+=4096)
-		do_no_page(4, current->start_code+buffer);
+		do_no_page(4, current->start_code+tmp_buf);
 		
 
 	return 0;

pipe.c

@@ -1,122 +0,0 @@
-/*
- *  linux/fs/pipe.c
- *
- *  (C) 1991  Linus Torvalds
- */
-
-#include <signal.h>
-
-#include <linux/sched.h>
-#include <linux/mm.h>	/* for get_free_page */
-#include <asm/segment.h>
-#include <unistd.h>
-
-int read_pipe(struct m_inode * inode, char * buf, int count)
-{
-	int chars, size, read = 0;
-
-	while (count>0) {
-		while (!(size=PIPE_SIZE(*inode))) {
-			wake_up(&inode->i_wait);
-			if (inode->i_count != 2) /* are there any writers? */
-				return read;
-			sleep_on(&inode->i_wait);
-		}
-		chars = PAGE_SIZE-PIPE_TAIL(*inode);
-		if (chars > count)
-			chars = count;
-		if (chars > size)
-			chars = size;
-		count -= chars;
-		read += chars;
-		size = PIPE_TAIL(*inode);
-		PIPE_TAIL(*inode) += chars;
-		PIPE_TAIL(*inode) &= (PAGE_SIZE-1);
-		while (chars-->0)
-			put_fs_byte(((char *)inode->i_size)[size++],buf++);
-	}
-	wake_up(&inode->i_wait);
-	return read;
-}
-	
-int write_pipe(struct m_inode * inode, char * buf, int count)
-{
-	int chars, size, written = 0;
-
-	while (count>0) {
-		while (!(size=(PAGE_SIZE-1)-PIPE_SIZE(*inode))) {
-			wake_up(&inode->i_wait);
-			if (inode->i_count != 2) { /* no readers */
-				current->signal |= (1<<(SIGPIPE-1));
-				return written?written:-1;
-			}
-			sleep_on(&inode->i_wait);
-		}
-		chars = PAGE_SIZE-PIPE_HEAD(*inode);
-		if (chars > count)
-			chars = count;
-		if (chars > size)
-			chars = size;
-		count -= chars;
-		written += chars;
-		size = PIPE_HEAD(*inode);
-		PIPE_HEAD(*inode) += chars;
-		PIPE_HEAD(*inode) &= (PAGE_SIZE-1);
-		while (chars-->0)
-			((char *)inode->i_size)[size++]=get_fs_byte(buf++);
-	}
-	wake_up(&inode->i_wait);
-	return written;
-}
-
-int sys_pipe(unsigned long * fildes)
-{
-	struct m_inode * inode;
-	struct file * f[2];
-	int fd[2];
-	int i,j;
-
-	j=0;
-	for(i=0;j<2 && i<NR_FILE;i++)
-		if (!file_table[i].f_count)
-			(f[j++]=i+file_table)->f_count++;
-	if (j==1)
-		f[0]->f_count=0;
-	if (j<2)
-		return -1;
-	j=0;
-	for(i=0;j<2 && i<NR_OPEN;i++)
-		if (!current->filp[i]) {
-			current->filp[ fd[j]=i ] = f[j];
-			j++;
-		}
-	if (j==1)
-		current->filp[fd[0]]=NULL;
-	if (j<2) {
-		f[0]->f_count=f[1]->f_count=0;
-		return -1;
-	}
-	if (!(inode=get_pipe_inode())) {
-		current->filp[fd[0]] =
-			current->filp[fd[1]] = NULL;
-		f[0]->f_count = f[1]->f_count = 0;
-		return -1;
-	}
-	f[0]->f_inode = f[1]->f_inode = inode;
-	f[0]->f_pos = f[1]->f_pos = 0;
-	f[0]->f_mode = 1;		/* read */
-	f[1]->f_mode = 2;		/* write */
-	put_fs_long(fd[0],0+fildes);
-	put_fs_long(fd[1],1+fildes);
-	return 0;
-}
-
-int sys_sleep(unsigned int seconds)
-{
-	sys_signal(SIGALRM,SIG_IGN);
-	sys_alarm(seconds);
-	sys_pause();
-	if(current->alarm!=0)
-		return -1;
-	return 0;
-}

read_write.c

@@ -1,157 +0,0 @@
-/*
- *  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>
-#include <unistd.h>
-
-extern int rw_char(int rw,int dev, char * buf, int count, off_t * pos);
-extern int read_pipe(struct m_inode * inode, char * buf, int count);
-extern int write_pipe(struct m_inode * inode, char * buf, int count);
-extern int block_read(int dev, off_t * pos, char * buf, int count);
-extern int block_write(int dev, off_t * pos, char * buf, int count);
-extern int file_read(struct m_inode * inode, struct file * filp,
-		char * buf, int count);
-extern int file_write(struct m_inode * inode, struct file * filp,
-		char * buf, int count);
-
-int sys_lseek(unsigned int fd,off_t offset, int origin)
-{
-	struct file * file;
-	int tmp;
-
-	if (fd >= NR_OPEN || !(file=current->filp[fd]) || !(file->f_inode)
-	   || !IS_SEEKABLE(MAJOR(file->f_inode->i_dev)))
-		return -EBADF;
-	if (file->f_inode->i_pipe)
-		return -ESPIPE;
-	switch (origin) {
-		case 0:
-			if (offset<0) return -EINVAL;
-			file->f_pos=offset;
-			break;
-		case 1:
-			if (file->f_pos+offset<0) return -EINVAL;
-			file->f_pos += offset;
-			break;
-		case 2:
-			if ((tmp=file->f_inode->i_size+offset) < 0)
-				return -EINVAL;
-			file->f_pos = tmp;
-			break;
-		default:
-			return -EINVAL;
-	}
-	return file->f_pos;
-}
-
-int my_read(unsigned int fd,char * buf,int count)
-{
-	struct file * file;
-	struct m_inode * inode;
-
-	if (fd>=NR_OPEN || count<0 || !(file=current->filp[fd]))
-		return -EINVAL;
-	if (!count)
-		return 0;
-	verify_area(buf,count);
-	inode = file->f_inode;
-	if (inode->i_pipe)
-		return (file->f_mode&1)?read_pipe(inode,buf,count):-EIO;
-	if (S_ISCHR(inode->i_mode))
-		return rw_char(READ,inode->i_zone[0],buf,count,&file->f_pos);
-	if (S_ISBLK(inode->i_mode))
-		return block_read(inode->i_zone[0],&file->f_pos,buf,count);
-	if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode)) {
-		if (count+file->f_pos > inode->i_size)
-			count = inode->i_size - file->f_pos;
-		if (count<=0)
-			return 0;
-		return new_file_read(inode,file,buf,count);
-	}
-	printk("(Read)inode->i_mode=%06o\n\r",inode->i_mode);
-	return -EINVAL;
-}
-
-
-int sys_getdents(unsigned int fd, struct linux_dirent *dirp, unsigned long count)
-{
-	char name[16];
-	int i=0,j=0;
-	int rst=count;
-
-	while(my_read(fd,name,16)>0 && name[0] && count-32>0)			//read读目录项（16字节）
-	{
-		put_fs_long(name, &(dirp->d_ino));							//写入目录项名字
-		i++;
-		put_fs_long(i,&(dirp->d_off));								//写入偏移
-		put_fs_word(32,&(dirp->d_reclen));
-
-		for(j=0;j<14;j++)
-		{
-			put_fs_byte(name[j+2],dirp->d_name+j);
-		}
-		count-=32;
-		dirp=(struct linux_dirent*)((char *)dirp+32);
-	}
-	return rst-count;
-}
-
-int sys_read(unsigned int fd,char * buf,int count)
-{
-	struct file * file;
-	struct m_inode * inode;
-
-	if (fd>=NR_OPEN || count<0 || !(file=current->filp[fd]))
-		return -EINVAL;
-	if (!count)
-		return 0;
-	verify_area(buf,count);
-	inode = file->f_inode;
-	if (inode->i_pipe)
-		return (file->f_mode&1)?read_pipe(inode,buf,count):-EIO;
-	if (S_ISCHR(inode->i_mode))
-		return rw_char(READ,inode->i_zone[0],buf,count,&file->f_pos);
-	if (S_ISBLK(inode->i_mode))
-		return block_read(inode->i_zone[0],&file->f_pos,buf,count);
-	if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode)) {
-		if (count+file->f_pos > inode->i_size)
-			count = inode->i_size - file->f_pos;
-		if (count<=0)
-			return 0;
-		return file_read(inode,file,buf,count);
-	}
-	printk("(Read)inode->i_mode=%06o\n\r",inode->i_mode);
-	return -EINVAL;
-}
-
-int sys_write(unsigned int fd,char * buf,int count)
-{
-	struct file * file;
-	struct m_inode * inode;
-	
-	if (fd>=NR_OPEN || count <0 || !(file=current->filp[fd]))
-		return -EINVAL;
-	if (!count)
-		return 0;
-	inode=file->f_inode;
-	if (inode->i_pipe)
-		return (file->f_mode&2)?write_pipe(inode,buf,count):-EIO;
-	if (S_ISCHR(inode->i_mode))
-		return rw_char(WRITE,inode->i_zone[0],buf,count,&file->f_pos);
-	if (S_ISBLK(inode->i_mode))
-		return block_write(inode->i_zone[0],&file->f_pos,buf,count);
-	if (S_ISREG(inode->i_mode))
-		return file_write(inode,file,buf,count);
-	printk("(Write)inode->i_mode=%06o\n\r",inode->i_mode);
-	return -EINVAL;
-}
-

sleep.c

@@ -1,30 +0,0 @@
-#include<stdio.h>
-#include<signal.h>
-#include<unistd.h>
-void sigAlrm(int signal)
-{}
-
-unsigned int mysleep(unsigned int second)
-{
-    struct sigaction sig,osig;
-    sig.sa_handler = sigAlrm;
-    sigemptyset(&sig.sa_mask);
-    sig.sa_flags = 0;
-
-    sigaction(SIGALRM,&sig,&osig);
-    alarm(second);
-    pause();
-    unsigned int ret = alarm(0);
-    sigaction(SIGALRM,&sig,NULL);
-    return ret;
-}
-
-int main()
-{
-    while(1)
-    {
-        mysleep(2);
-        printf("sleep 2 second\n");
-    }
-    return 0;
-}

stat.c

@@ -1,185 +0,0 @@
-/*
- *  linux/fs/stat.c
- *
- *  (C) 1991  Linus Torvalds
- */
-
-#include <errno.h>
-#include <sys/stat.h>
-
-#include <linux/fs.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <asm/segment.h>
-#include <fcntl.h>
-
-static void cp_stat(struct m_inode * inode, struct stat * statbuf)
-{
-	struct stat tmp;
-	int i;
-
-	verify_area(statbuf,sizeof (* statbuf));
-	tmp.st_dev = inode->i_dev;
-	tmp.st_ino = inode->i_num;
-	tmp.st_mode = inode->i_mode;
-	tmp.st_nlink = inode->i_nlinks;
-	tmp.st_uid = inode->i_uid;
-	tmp.st_gid = inode->i_gid;
-	tmp.st_rdev = inode->i_zone[0];
-	tmp.st_size = inode->i_size;
-	tmp.st_atime = inode->i_atime;
-	tmp.st_mtime = inode->i_mtime;
-	tmp.st_ctime = inode->i_ctime;
-	for (i=0 ; i<sizeof (tmp) ; i++)
-		put_fs_byte(((char *) &tmp)[i],&((char *) statbuf)[i]);
-}
-
-static void new_cp_stat(struct m_inode * inode, struct stat * statbuf)
-{
-	struct stat tmp;
-	int i;
-
-	verify_area(statbuf,sizeof (* statbuf));
-	tmp.st_dev = inode->i_dev;
-	tmp.st_ino = inode->i_num;
-	tmp.st_mode = inode->i_mode;
-	tmp.st_nlink = inode->i_nlinks;
-	tmp.st_uid = inode->i_uid;
-	tmp.st_gid = inode->i_gid;
-	tmp.st_rdev = inode->i_zone[0];
-	tmp.st_size = inode->i_size;
-	tmp.st_atime = inode->i_atime;
-	tmp.st_mtime = inode->i_mtime;
-	tmp.st_ctime = inode->i_ctime;
-	for (i=0 ; i<sizeof (tmp) ; i++)
-		//put_fs_byte(((char *) &tmp)[i],&((char *) statbuf)[i]);
-		((char *)statbuf)[i]=((char *) &tmp)[i];
-}
-
-
-int sys_stat(char * filename, struct stat * statbuf)
-{
-	struct m_inode * inode;
-
-	if (!(inode=namei(filename)))
-		return -ENOENT;
-	cp_stat(inode,statbuf);
-	iput(inode);
-	return 0;
-}
-
-int my_stat(char * filename, struct stat * statbuf)
-{
-	struct m_inode * inode;
-
-	if (!(inode=namei(filename)))
-		return -ENOENT;
-	new_cp_stat(inode,statbuf);
-	iput(inode);
-	return 0;
-}
-
-int sys_lstat(char * filename, struct stat * statbuf)
-{
-	return sys_stat(filename, statbuf);
-}
-
-int sys_fstat(unsigned int fd, struct stat * statbuf)
-{
-	struct file * f;
-	struct m_inode * inode;
-
-	if (fd >= NR_OPEN || !(f=current->filp[fd]) || !(inode=f->f_inode))
-		return -EBADF;
-	cp_stat(inode,statbuf);
-	return 0;
-}
-
-int sys_readlink()
-{
-	return -ENOSYS;
-}
-
-char *sys_getcwd(char *buf,size_t size)
-{
-	char path[128], cwd[128], name[16], res[128]; 
-	int dirp; 
-	struct stat sb, sb_d, sb_1; 
-	dev_t dev; 
-	ino_t ino; 
-	int tmp = 0, i; 
-	memset(res, 0, sizeof(res)); 
-	while(1) 
-	{ 
-		//将当前目录的字符串"."存入buf中才能作为stat的参数传入使用
-		put_fs_byte('.', &buf[0]); 
-		put_fs_byte(0, &buf[1]); 
-
-		//获取当前目录的文件信息
-		my_stat(buf, &sb); 
-		dev = sb.st_dev; 
-		ino = sb.st_ino;
-
-		//将父目录".."字符串写入buf中
-		put_fs_byte('.', &buf[0]); 
-		put_fs_byte('.', &buf[1]); 
-		put_fs_byte(0, &buf[2]); 
-
-		//获取父目录的对应的目录流
-		dirp = sys_open(buf, O_RDONLY, 0); 
-		//获取父目录的文件信息
-		my_stat(buf, &sb_1); 
-
-		//判断当前目录是否与父目录相同，相同则找到当前路径
-		if(sb_1.st_dev == dev && sb_1.st_ino == ino)
-		{ 
-			break; 
-		}
-
-		//在父目录对应的目录流读取条目（与getdents类似）
-		//遍历父目录下对应的所有目录与之前获取的当前目录想匹配，匹配成功的目录项对当前目录所在的目录项，即可保存名字后继续向前寻找
-		while(my_read(dirp, name, 16) > 0 && name[0])
-		{ 
-			tmp = 0; 
-			memset(path, 0, sizeof(path)); 
-			path[0] = '.';path[1] = '.';path[2] = '/'; 
-			while(name[tmp+2])
-			{ 
-				path[tmp+3] = name[tmp+2]; 
-				tmp++; 
-			}
-			path[tmp+3] = 0; 
-			for(i=0;i<size;i++)
-				put_fs_byte(path[i], &buf[i]); 
-
-		    //获取当前父目录下的目录项文件信息
-			my_stat(buf, &sb_d); 
-			if(dev == sb_d.st_dev && ino == sb_d.st_ino)
-			{ 
-				//若匹配成功，则写入文件路径
-				memset(cwd, 0, sizeof(cwd)); 
-				strcat(cwd, "/"); 
-				strcat(cwd, name+2); 
-				strcat(cwd, res); 
-				strncpy(res, cwd, size); 
-				break; 
-			}
-		}
-		//关闭当前打开的父目录
-		sys_close(dirp); 
-
-		//将buf重新修改为父目录对应的字符串".."
-		put_fs_byte('.', &buf[0]); 
-		put_fs_byte('.', &buf[1]); 
-		put_fs_byte(0, &buf[2]); 
-
-		//改变当前目录到上一级，继续上述遍历寻找步骤直到父目录与当前目录相一致
-		sys_chdir(buf);
-	}
-	//将得到的路径写入buf中
-	for(i=0;i<size;i++) 
-		put_fs_byte(res[i], &buf[i]); 
-	sys_close(dirp); 
-	sys_chdir(buf); 
-	return buf;
-}

sys.h

@@ -1,117 +0,0 @@
-/*
- * Why isn't this a .c file?  Enquiring minds....
- */
-
-extern int sys_setup();
-extern int sys_exit();
-extern int sys_fork();
-extern int sys_read();
-extern int sys_write();
-extern int sys_open();
-extern int sys_close();
-extern int sys_waitpid();
-extern int sys_creat();
-extern int sys_link();
-extern int sys_unlink();
-extern int sys_execve();
-extern int sys_chdir();
-extern int sys_time();
-extern int sys_mknod();
-extern int sys_chmod();
-extern int sys_chown();
-extern int sys_break();
-extern int sys_stat();
-extern int sys_lseek();
-extern int sys_getpid();
-extern int sys_mount();
-extern int sys_umount();
-extern int sys_setuid();
-extern int sys_getuid();
-extern int sys_stime();
-extern int sys_ptrace();
-extern int sys_alarm();
-extern int sys_fstat();
-extern int sys_pause();
-extern int sys_utime();
-extern int sys_stty();
-extern int sys_gtty();
-extern int sys_access();
-extern int sys_nice();
-extern int sys_ftime();
-extern int sys_sync();
-extern int sys_kill();
-extern int sys_rename();
-extern int sys_mkdir();
-extern int sys_rmdir();
-extern int sys_dup();
-extern int sys_pipe();
-extern int sys_times();
-extern int sys_prof();
-extern int sys_brk();
-extern int sys_setgid();
-extern int sys_getgid();
-extern int sys_signal();
-extern int sys_geteuid();
-extern int sys_getegid();
-extern int sys_acct();
-extern int sys_phys();
-extern int sys_lock();
-extern int sys_ioctl();
-extern int sys_fcntl();
-extern int sys_mpx();
-extern int sys_setpgid();
-extern int sys_ulimit();
-extern int sys_uname();
-extern int sys_umask();
-extern int sys_chroot();
-extern int sys_ustat();
-extern int sys_dup2();
-extern int sys_getppid();
-extern int sys_getpgrp();
-extern int sys_setsid();
-extern int sys_sigaction();
-extern int sys_sgetmask();
-extern int sys_ssetmask();
-extern int sys_setreuid();
-extern int sys_setregid();
-extern int sys_sigpending();
-extern int sys_sigsuspend();
-extern int sys_sethostname();
-extern int sys_setrlimit();
-extern int sys_getrlimit();
-extern int sys_getrusage();
-extern int sys_gettimeofday();
-extern int sys_settimeofday();
-extern int sys_getgroups();
-extern int sys_setgroups();
-extern int sys_select();
-extern int sys_symlink();
-extern int sys_lstat();
-extern int sys_readlink();
-extern int sys_uselib();
-extern int sys_execve2();
-extern int sys_getdents();
-extern int sys_sleep();
-extern int sys_getcwd();
-
-
-fn_ptr sys_call_table[] = { sys_setup, sys_exit, sys_fork, sys_read,
-sys_write, sys_open, sys_close, sys_waitpid, sys_creat, sys_link,
-sys_unlink, sys_execve, sys_chdir, sys_time, sys_mknod, sys_chmod,
-sys_chown, sys_break, sys_stat, sys_lseek, sys_getpid, sys_mount,
-sys_umount, sys_setuid, sys_getuid, sys_stime, sys_ptrace, sys_alarm,
-sys_fstat, sys_pause, sys_utime, sys_stty, sys_gtty, sys_access,
-sys_nice, sys_ftime, sys_sync, sys_kill, sys_rename, sys_mkdir,
-sys_rmdir, sys_dup, sys_pipe, sys_times, sys_prof, sys_brk, sys_setgid,
-sys_getgid, sys_signal, sys_geteuid, sys_getegid, sys_acct, sys_phys,
-sys_lock, sys_ioctl, sys_fcntl, sys_mpx, sys_setpgid, sys_ulimit,
-sys_uname, sys_umask, sys_chroot, sys_ustat, sys_dup2, sys_getppid,
-sys_getpgrp, sys_setsid, sys_sigaction, sys_sgetmask, sys_ssetmask,
-sys_setreuid,sys_setregid, sys_sigsuspend, sys_sigpending, sys_sethostname,
-sys_setrlimit, sys_getrlimit, sys_getrusage, sys_gettimeofday, 
-sys_settimeofday, sys_getgroups, sys_setgroups, sys_select, sys_symlink,
-sys_lstat, sys_readlink, sys_uselib, sys_execve2, sys_getdents, sys_pause, sys_sleep,
-sys_getcwd};
-
-/* So we don't have to do any more manual updating.... */
-int NR_syscalls = sizeof(sys_call_table)/sizeof(fn_ptr);

unistd.h

@@ -1,287 +0,0 @@
-#ifndef _UNISTD_H
-#define _UNISTD_H
-
-/* ok, this may be a joke, but I'm working on it */
-#define _POSIX_VERSION 198808L
-
-#define _POSIX_CHOWN_RESTRICTED	/* only root can do a chown (I think..) */
-#define _POSIX_NO_TRUNC		/* no pathname truncation (but see in kernel) */
-#define _POSIX_VDISABLE '\0'	/* character to disable things like ^C */
-/*#define _POSIX_SAVED_IDS */	/* we'll get to this yet */
-/*#define _POSIX_JOB_CONTROL */	/* we aren't there quite yet. Soon hopefully */
-
-#define STDIN_FILENO	0
-#define STDOUT_FILENO	1
-#define STDERR_FILENO	2
-
-#ifndef NULL
-#define NULL    ((void *)0)
-#endif
-
-/* access */
-#define F_OK	0
-#define X_OK	1
-#define W_OK	2
-#define R_OK	4
-
-/* lseek */
-#define SEEK_SET	0
-#define SEEK_CUR	1
-#define SEEK_END	2
-
-/* _SC stands for System Configuration. We don't use them much */
-#define _SC_ARG_MAX		1
-#define _SC_CHILD_MAX		2
-#define _SC_CLOCKS_PER_SEC	3
-#define _SC_NGROUPS_MAX		4
-#define _SC_OPEN_MAX		5
-#define _SC_JOB_CONTROL		6
-#define _SC_SAVED_IDS		7
-#define _SC_VERSION		8
-
-/* more (possibly) configurable things - now pathnames */
-#define _PC_LINK_MAX		1
-#define _PC_MAX_CANON		2
-#define _PC_MAX_INPUT		3
-#define _PC_NAME_MAX		4
-#define _PC_PATH_MAX		5
-#define _PC_PIPE_BUF		6
-#define _PC_NO_TRUNC		7
-#define _PC_VDISABLE		8
-#define _PC_CHOWN_RESTRICTED	9
-
-#include <sys/stat.h>
-#include <sys/times.h>
-#include <sys/utsname.h>
-#include <utime.h>
-
-#ifdef __LIBRARY__
-
-#define __NR_setup	0	/* used only by init, to get system going */
-#define __NR_exit	1
-#define __NR_fork	2
-#define __NR_read	3
-#define __NR_write	4
-#define __NR_open	5
-#define __NR_close	6
-#define __NR_waitpid	7
-#define __NR_creat	8
-#define __NR_link	9
-#define __NR_unlink	10
-#define __NR_execve	11
-#define __NR_chdir	12
-#define __NR_time	13
-#define __NR_mknod	14
-#define __NR_chmod	15
-#define __NR_chown	16
-#define __NR_break	17
-#define __NR_stat	18
-#define __NR_lseek	19
-#define __NR_getpid	20
-#define __NR_mount	21
-#define __NR_umount	22
-#define __NR_setuid	23
-#define __NR_getuid	24
-#define __NR_stime	25
-#define __NR_ptrace	26
-#define __NR_alarm	27
-#define __NR_fstat	28
-#define __NR_pause	29
-#define __NR_utime	30
-#define __NR_stty	31
-#define __NR_gtty	32
-#define __NR_access	33
-#define __NR_nice	34
-#define __NR_ftime	35
-#define __NR_sync	36
-#define __NR_kill	37
-#define __NR_rename	38
-#define __NR_mkdir	39
-#define __NR_rmdir	40
-#define __NR_dup	41
-#define __NR_pipe	42
-#define __NR_times	43
-#define __NR_prof	44
-#define __NR_brk	45
-#define __NR_setgid	46
-#define __NR_getgid	47
-#define __NR_signal	48
-#define __NR_geteuid	49
-#define __NR_getegid	50
-#define __NR_acct	51
-#define __NR_phys	52
-#define __NR_lock	53
-#define __NR_ioctl	54
-#define __NR_fcntl	55
-#define __NR_mpx	56
-#define __NR_setpgid	57
-#define __NR_ulimit	58
-#define __NR_uname	59
-#define __NR_umask	60
-#define __NR_chroot	61
-#define __NR_ustat	62
-#define __NR_dup2	63
-#define __NR_getppid	64
-#define __NR_getpgrp	65
-#define __NR_setsid	66
-#define __NR_sigaction	67
-#define __NR_sgetmask	68
-#define __NR_ssetmask	69
-#define __NR_setreuid	70
-#define __NR_setregid	71
-#define __NR_sigsuspend	72
-#define __NR_sigpending	73
-#define __NR_sethostname 74
-#define __NR_setrlimit	75
-#define __NR_getrlimit	76
-#define __NR_getrusage	77
-#define __NR_gettimeofday	78
-#define __NR_settimeofday	79
-#define __NR_getgroups	80
-#define __NR_setgroups  81
-#define __NR_select	82
-#define __NR_symlink	83
-#define __NR_lstat	84
-#define __NR_readlink	85
-#define __NR_uselib	86
-#define __NR_execve2 87
-#define __NR_getdents 88
-
-#define __NR_sleep 90
-#define __NR_getcwd	91
-
-#define _syscall0(type,name) \
-type name(void) \
-{ \
-long __res; \
-__asm__ volatile ("int $0x80" \
-	: "=a" (__res) \
-	: "0" (__NR_##name)); \
-if (__res >= 0) \
-	return (type) __res; \
-errno = -__res; \
-return -1; \
-}
-
-#define _syscall1(type,name,atype,a) \
-type name(atype a) \
-{ \
-long __res; \
-__asm__ volatile ("int $0x80" \
-	: "=a" (__res) \
-	: "0" (__NR_##name),"b" ((long)(a))); \
-if (__res >= 0) \
-	return (type) __res; \
-errno = -__res; \
-return -1; \
-}
-
-#define _syscall2(type,name,atype,a,btype,b) \
-type name(atype a,btype b) \
-{ \
-long __res; \
-__asm__ volatile ("int $0x80" \
-	: "=a" (__res) \
-	: "0" (__NR_##name),"b" ((long)(a)),"c" ((long)(b))); \
-if (__res >= 0) \
-	return (type) __res; \
-errno = -__res; \
-return -1; \
-}
-
-#define _syscall3(type,name,atype,a,btype,b,ctype,c) \
-type name(atype a,btype b,ctype c) \
-{ \
-long __res; \
-__asm__ volatile ("int $0x80" \
-	: "=a" (__res) \
-	: "0" (__NR_##name),"b" ((long)(a)),"c" ((long)(b)),"d" ((long)(c))); \
-if (__res>=0) \
-	return (type) __res; \
-errno=-__res; \
-return -1; \
-}
-
-#endif /* __LIBRARY__ */
-
-extern int errno;
-
-struct linux_dirent {
-    long           d_ino;//inode number
-    off_t          d_off;//offset to next dirent
-    unsigned short d_reclen;//该结构体的长度，固定为32个字节
-    char           d_name[];//name
-};
-
-int access(const char * filename, mode_t mode);
-int acct(const char * filename);
-int alarm(int sec);
-int brk(void * end_data_segment);
-void * sbrk(ptrdiff_t increment);
-int chdir(const char * filename);
-int chmod(const char * filename, mode_t mode);
-int chown(const char * filename, uid_t owner, gid_t group);
-int chroot(const char * filename);
-int close(int fildes);
-int creat(const char * filename, mode_t mode);
-int dup(int fildes);
-int execve(const char * filename, char ** argv, char ** envp);
-int execv(const char * pathname, char ** argv);
-int execvp(const char * file, char ** argv);
-int execl(const char * pathname, char * arg0, ...);
-int execlp(const char * file, char * arg0, ...);
-int execle(const char * pathname, char * arg0, ...);
-volatile void exit(int status);
-volatile void _exit(int status);
-int fcntl(int fildes, int cmd, ...);
-int fork(void);
-int getpid(void);
-int getuid(void);
-int geteuid(void);
-int getgid(void);
-int getegid(void);
-int ioctl(int fildes, int cmd, ...);
-int kill(pid_t pid, int signal);
-int link(const char * filename1, const char * filename2);
-int lseek(int fildes, off_t offset, int origin);
-int mknod(const char * filename, mode_t mode, dev_t dev);
-int mount(const char * specialfile, const char * dir, int rwflag);
-int nice(int val);
-int open(const char * filename, int flag, ...);
-int pause(void);
-int pipe(int * fildes);
-int read(int fildes, char * buf, off_t count);
-int setpgrp(void);
-int setpgid(pid_t pid,pid_t pgid);
-int setuid(uid_t uid);
-int setgid(gid_t gid);
-void (*signal(int sig, void (*fn)(int)))(int);
-int stat(const char * filename, struct stat * stat_buf);
-int fstat(int fildes, struct stat * stat_buf);
-int stime(time_t * tptr);
-int sync(void);
-time_t time(time_t * tloc);
-time_t times(struct tms * tbuf);
-int ulimit(int cmd, long limit);
-mode_t umask(mode_t mask);
-int umount(const char * specialfile);
-int uname(struct utsname * name);
-int unlink(const char * filename);
-int ustat(dev_t dev, struct ustat * ubuf);
-int utime(const char * filename, struct utimbuf * times);
-pid_t waitpid(pid_t pid,int * wait_stat,int options);
-pid_t wait(int * wait_stat);
-int write(int fildes, const char * buf, off_t count);
-int dup2(int oldfd, int newfd);
-int getppid(void);
-pid_t getpgrp(void);
-pid_t setsid(void);
-int execve2(const char *path, char ** argv, char ** envp);
-int getdents(unsigned int fd, struct linux_dirent *dirp, unsigned long count);
-int sleep(unsigned int seconds);
-long getcwd(char * buf, size_t size);
-
-
-#define __always_inline inline __attribute__((always_inline))
-
-#endif