63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
/*
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ttyslot.c
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Return the index in the utmp file for the current user's terminal. The
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current user's terminal is the first file descriptor in the range 0..2
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for which ttyname() returns a name. The index is the line number in the
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/etc/ttytab file. 0 will be returned in case of an error.
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Created: Oct 11, 1992 by Philip Homburg
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*/
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#define _MINIX_SOURCE
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#include <sys/types.h>
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#include <ttyent.h>
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#include <string.h>
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#include <unistd.h>
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int ttyslot()
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{
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int slot;
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slot= fttyslot(0);
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if (slot == 0) slot= fttyslot(1);
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if (slot == 0) slot= fttyslot(2);
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return slot;
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}
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int fttyslot(fd)
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int fd;
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{
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char *tname;
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int lineno;
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struct ttyent *ttyp;
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tname= ttyname(fd);
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if (tname == NULL) return 0;
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/* Assume that tty devices are in /dev */
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if (strncmp(tname, "/dev/", 5) != 0)
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return 0; /* Malformed tty name. */
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tname += 5;
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/* Scan /etc/ttytab. */
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lineno= 1;
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while ((ttyp= getttyent()) != NULL)
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{
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if (strcmp(tname, ttyp->ty_name) == 0)
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{
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endttyent();
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return lineno;
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}
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lineno++;
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}
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/* No match */
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endttyent();
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return 0;
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}
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/*
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* $PchHeader: /mount/hd2/minix/lib/misc/RCS/ttyslot.c,v 1.3 1994/12/22 13:49:12 philip Exp $
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*/
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