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/*

 *  ttyname_r() - POSIX 1003.1b 4.7.2 - Demetermine Terminal Device Name

 *

 *  $Id: ttyname.c,v 1.2 2001-09-27 12:01:15 chris Exp $

 */

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <dirent.h>

#include <termios.h>

#include <unistd.h>

#include <paths.h>

#include <_syslist.h>

#include <errno.h>

#include "libio_.h"

int ttyname_r(

  int   fd,

  char *name,

  int   namesize

)

{

  struct stat sb;

  struct termios tty;

  struct dirent *dirp;

  DIR *dp;

  struct stat dsb;

  char *rval;

  /* Must be a terminal. */

  if (tcgetattr (fd, &tty) < 0)

    set_errno_and_return_minus_one(EBADF);

  /* Must be a character device. */

  if (_fstat (fd, &sb) || !S_ISCHR (sb.st_mode))

    set_errno_and_return_minus_one(EBADF);

  if ((dp = opendir (_PATH_DEV)) == NULL)

    set_errno_and_return_minus_one(EBADF);

  for (rval = NULL; (dirp = readdir (dp)) != NULL ;)

    {

      if (dirp->d_ino != sb.st_ino)

        continue;

      strcpy (name + sizeof (_PATH_DEV) - 1, dirp->d_name);

      if (stat (name, &dsb) || sb.st_dev != dsb.st_dev ||

          sb.st_ino != dsb.st_ino)

        continue;

      (void) closedir (dp);

      rval = name;

      break;

    }

  (void) closedir (dp);

  return 0;

}

static char buf[sizeof (_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;

/*

 *  ttyname() - POSIX 1003.1b 4.7.2 - Demetermine Terminal Device Name

 */

char *ttyname(

  int fd

)

{

  if ( !ttyname_r( fd, buf, sizeof(buf) ) )

    return buf;

  return NULL;

}