一个简单的pwd，segfault了
看书上代码写的，可是一运行就出现 Segmentation fault
#include <stdio.h>segment?fault
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define BUFSIZE NAME_MAX
ino_t get_inode(char*);
void printpathto(ino_t);
void inum_to_name(ino_t,char*,int);
int main(int argc, char** argv)
{
printpathto(get_inode("."));
putchar('\n');
return 0;
}
ino_t get_inode(char* filename)
{
struct stat info;
if(stat(filename,&info)==-1)
{
fprintf(stderr,"Cannot stat");
perror(filename);
exit(1);
}
return info.st_ino;
}
void printpathto(ino_t this_node)
{
ino_t my_inode;
char its_name[BUFSIZE];
if(get_inode("..")!=this_node); //if this is not root
{
inum_to_name(this_node,its_name,BUFSIZE);
chdir("..");
my_inode=get_inode(".");
printpathto(my_inode); //recursive print
printf("/%s",its_name);
}
}
void inum_to_name(ino_t inode_to_find, char* namebuf, int bufsize)
{
DIR* dir_ptr;
struct dirent * direntp;
dir_ptr=opendir(".");
if(dir_ptr==NULL)
{
perror(".");
exit(1);
}
while((direntp=readdir(dir_ptr))!=NULL)
{
if(direntp->d_ino == inode_to_find)
{
strncpy(namebuf, direntp->d_name, bufsize);
namebuf[bufsize-1] = '\0'; //just in case
closedir(dir_ptr);
return ;
}
}
fprintf(stderr, "error looking for inum %d\n",(int)inode_to_find);
exit(1);
}
