crypt system call

[Kousik Bera <kousik.bera@xxxxxxxxxxxx>]

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Hi All,
I am porting some c++ program from Solaris to Linux. One module uses the
system call 'crypt'.
When I try to compile the source, the linker(ld) is unable to link the
'crypt' code from the
system library/libc(I am not sure). I checked the man pages for crypt.
It's there. So I guess my system(RH 5.2, Kernel 2.0.36) supports 'crypt'
call. There is no /etc/shadow file. /etc/passwd file is there, and all
users and their encrypted passwords are listed there. 
So I guess Shadow-Password suite is not installed on my system.
I am attaching a simple C test code and the linker output. Why 'crypt'
call is giving this problem? If crypt call can't be used, are there any
alternative method for password authentication programatically? 
BTW if I want to know, what is the source code name for say "cp", are
there any way to find this info?
TIA,
Kousik
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#define __XOPEN_SOURCE 
#include <stdio.h>
#include <unistd.h>
#include <pwd.h>
#include <sys/types.h>
#include <string.h>
main()
{
char user[24], passwrd[24];
struct passwd *pw;
char *result;
printf("Enter Username :");
scanf("%s",user);
printf("Enter Password :");
scanf("%s",passwrd);
if((pw=getpwnam(user)) == NULL)
  {
  result = crypt(passwrd,pw->pw_passwd);
  if(!strcmp(result,pw->pw_passwd))
    printf("Ok !\n");
  else 
    printf("Invalid Password \n");
  }
}




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cryptest.c: In function `main':
cryptest.c:18: warning: assignment makes pointer from integer without a cast
/tmp/cca005701.o: In function `main':
/tmp/cca005701.o(.text+0x65): undefined reference to `crypt'

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