VxWorks下基于tffs文件操作

#include "vxworks.h"
#include "stdio.h"
#include "ioLib.h"
#include "sioLib.h"
#include "string.h"
#include "ioctl.h"
#include "selectLib.h"
#include "sys/stat.h"
long get_file_size(char *filename)
{
 struct stat f_stat;
 if(stat(filename,&f_stat)==-1)
  return -1;
 return f_stat.st_size;
 }
void filetest()
{
 int fd;
 int wnum;
 int rnum;
 int len;
 long flen;
 char *wbuf="hello world!";
 char rbuf[100];
 len=strlen(wbuf);
 printf("len-->%d\n",len);
 fd=creat("/tffs0/testdir/1.txt",O_RDWR);
 if(fd==ERROR)
  printf("creat error!\n");
 else{
  fd=open("/tffs0/testdir/1.txt",O_RDWR,0);
  if(fd==ERROR)
    printf("open error!\n");
  else
  {
   printf("%s\n",wbuf);
   wnum=write(fd,wbuf,len);
   printf("wnum-->%d\n",wnum);
   flen=get_file_size("/tffs0/testdir/1.txt");
   printf("file len-->%d\n",flen);
   rnum=read(fd,rbuf,len-1);
   printf("rnum-->%d\n",rnum);
   rbuf[len]=0;
   printf("%s\n",rbuf);
   close(fd);
  }
  
 }
}

void readfile()
{
 char rbuf[100];
 FILE* fd;
 int rnum;
 long flen;
 fd=fopen("/tffs0/testdir/1.txt","r");
 if(fd==NULL)
   printf("open error!\n");
 else
 {
  flen=get_file_size("/tffs0/testdir/1.txt");
  printf("file len-->%d\n",flen);
  rnum=fread(rbuf,flen,1,fd);
  printf("rnum-->%d\n",rnum);
  rbuf[flen]=0;
  printf("%s\n",rbuf);
  fclose(fd);
 }
}

void readfile2()
{
 char rbuf[100];
  int fd;
  int rnum;
  long flen;
  fd=open("/tffs0/testdir/1.txt",O_RDWR,0);
  if(fd==ERROR)
   printf("open error!\n");
  else
  {
   flen=get_file_size("/tffs0/testdir/1.txt");
   printf("file len-->%d\n",flen);
   rnum=read(fd,rbuf,flen);
   printf("rnum-->%d\n",rnum);
   rbuf[rnum]=0;
   printf("%s\n",rbuf);
   close(fd);
  }
}