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RedHat 6.2 : C Program getdents ld error

Posted on 2001-06-27
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Last Modified: 2007-12-19
Hi!
I am recieving an ld error when compiling a simple C program using the "getdents" function. I'm hoping that one of the experts out there can decode & fix the following ld error:
/tmp/ccO4jRVF.o: In function `main':
/tmp/ccO4jRVF.o(.text+0x50): undefined reference to `getdents'
collect2: ld returned 1 exit status

Here is a copy of my program:
/**********************************
 * Program Name : getdents_tester.c
 * Created      : LL 06/05/01
 **********************************/

#include <stdio.h>
#include <unistd.h>
#include <linux/types.h>
#include <linux/dirent.h>
#include <linux/unistd.h>

struct dirent *dirent_p;
unsigned      int fd;
unsigned      int count;
int           rc;

main()
{
   fd = 0x01;
   count = 0x200;
   printf("fd = 0x%x, count = 0x%x\n",fd,count);
   printf("Calling getdents...\n");
   rc = getdents(fd,dirent_p,count);
   printf("getdents returned 0x%x\n",rc);
   return(rc);
}

Good Luck!
Thanks!
lori-Ann :-)
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Question by:lleahy
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LVL 5

Accepted Solution

by:
bryanh earned 200 total points
ID: 6249509
First of all, did you compile cleanly with gcc -Wall?  In particular, it's important to know you don't have any implicitly defined functions.  Using gcc -Wall all the time can save you a lot of pain.

In this case, I believe you'll find that getdents() is not a GNU C library function, so you can't use it like this.  (The fact that you have to include <linux/...> files, which are Linux kernel interfaces, also tells you this).  You can use the _syscall3() C library function as described in the getdents() Linux man page, or you can use the POSIX function for reading directories, readdir().  readdir() uses the getdents() kernel service to do its job.  Not to be confused with the readdir() system call, which is a kernel service that the readdir() C library function used to use and still exists for backward compatibility.
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