[excise code]unix advanced programming

>excises:4.16

 Does the UNIX System have a fundamental limitation on the depth of a directory tree? To find out, write a program that creates a directory and then changes to that directory, in a loop. Make certain that the length of the absolute pathname of the leaf of this directory is greater than your system's PATH_MAX limit. Can you call getcwd to fetch the directory's pathname? How do the standard UNIX System tools deal with this long pathname? Can you archive the directory using either tar or cpio?

#include<unistd.h>
#include<stdio.h>
#include<sys/stat.h>

#define DEPTH 100
#define PATH "/home/qing/lab_process"
#define NAME "longlonglonglonglonglonglonglonglonglongname"
#define MAXLENGTH 8192

int main( int argc , char *argv[] )
{
  int i;
  char path_buffer[MAXLENGTH];
  if( chdir(PATH)<0 ){

        perror( "change main directory failed" );

        return;
  }

  for( i=0; i<DEPTH; i++){

       if( mkdir( NAME ,S_IRUSR|S_IWUSR|S_IXUSR ) <0 ){
           perror( "make directory failed" );

           return;
       }

       if( chdir( NAME ) <0 ){
           perror( "change a new directory" );

           return;
       }
  }

  printf( "obtain current directory!" );
  if( getcwd(path_buffer , MAXLENGTH)==NULL ){
    perror( "get current directory failed!" );

    return ;
  }

  puts( "current directory:" );
  //puts( path_buffer );

  printf( "pathbuffer:length--%d \nstring:%s", strlen(path_buffer) , path_buffer );
  puts( "\n" );
  return 0;
}


显示：
         get current directory failed!: File name too long