lib/libcompat_minix/fttyslot.c

   1 /*
   2 ttyslot.c
   3
   4 Return the index in the utmp file for the current user's terminal. The
   5 current user's terminal is the first file descriptor in the range 0..2
   6 for which ttyname() returns a name. The index is the line number in the
   7 /etc/ttytab file. 0 will be returned in case of an error.
   8
   9 Created:        Oct 11, 1992 by Philip Homburg
  10 */
  11
  12 #include <sys/types.h>
  13 #include <ttyent.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16
  17 int fttyslot(fd)
  18 int fd;
  19 {
  20         char *tname;
  21         int lineno;
  22         struct ttyent *ttyp;
  23
  24         tname= ttyname(fd);
  25         if (tname == NULL) return 0;
  26
  27         /* Assume that tty devices are in /dev */
  28         if (strncmp(tname, "/dev/", 5) != 0)
  29                 return 0;       /* Malformed tty name. */
  30         tname += 5;
  31
  32         /* Scan /etc/ttytab. */
  33         lineno= 1;
  34         while ((ttyp= getttyent()) != NULL)
  35         {
  36                 if (strcmp(tname, ttyp->ty_name) == 0)
  37                 {
  38                         endttyent();
  39                         return lineno;
  40                 }
  41                 lineno++;
  42         }
  43         /* No match */
  44         endttyent();
  45         return 0;
  46 }
  47
  48 /*
  49  * $PchHeader: /mount/hd2/minix/lib/misc/RCS/ttyslot.c,v 1.3 1994/12/22 13:49:12 philip Exp $
  50  */