xref: /titanic_52/usr/src/lib/libc/port/gen/ttyname.c (revision 6185db853e024a486ff8837e6784dd290d866112)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 /*	Copyright (c) 1988 AT&T	*/
30 /*	  All Rights Reserved  	*/
31 
32 
33 /*
34  * ttyname(f): return "/dev/X" (where X is a relative pathname
35  * under /dev/), which is the name of the tty character special
36  * file associated with the file descriptor f, or NULL if the
37  * pathname cannot be found.
38  *
39  * Ttyname tries to find the tty file by matching major/minor
40  * device, file system ID, and inode numbers of the file
41  * descriptor parameter to those of files in the /dev/ directory.
42  *
43  * It attempts to find a match on major/minor device numbers,
44  * file system ID, and inode numbers, but failing to match on
45  * all three, settles for just a match on device numbers and
46  * file system ID.
47  *
48  * To achieve higher performance and more flexible functionality,
49  * ttyname first looks for the tty file in the directories specified
50  * in the configuration file /etc/ttysrch. Entries in /etc/ttysrch
51  * may be qualified to specify that a partial match may be acceptable.
52  * This further improves performance by allowing an entry which
53  * matches major/minor and file system ID, but not inode number
54  * without searching the entire /dev tree. If /etc/ttysrch does not
55  * exist, ttyname looks in a default list of directories.  If after
56  * looking in the most likely places, ttyname still cannot find the
57  * tty file, it recursively searches thru the rest of the /dev/
58  * directory.
59  *
60  * In addition to the public interfaces, ttyname() & ttyname_r(), which
61  * do the lookup based on an open file descriptor,
62  * the private interface _ttyname_dev() does the lookup based on a
63  * major/minor device.  It follows the same order of lookup rules and
64  * returns similar information, but matches on just the major/minor
65  * device numbers.
66  */
67 
68 #pragma weak ttyname = _ttyname
69 #pragma weak ttyname_r = _ttyname_r
70 
71 #include "synonyms.h"
72 #include "mtlib.h"
73 #include "libc.h"
74 #include "_libc_gettext.h"
75 #include <sys/sysmacros.h>
76 #include <sys/types.h>
77 #include <dirent.h>
78 #include <fcntl.h>
79 #include <sys/stat.h>
80 #include <stdlib.h>
81 #include <ctype.h>
82 #include <string.h>
83 #include <stdio.h>
84 #include <unistd.h>
85 #include <thread.h>
86 #include <synch.h>
87 #include <errno.h>
88 #include <limits.h>
89 #include <sys/mkdev.h>
90 #include "tsd.h"
91 
92 typedef struct entry {
93 	char *name;
94 	int flags;
95 } entry_t;
96 
97 typedef struct special {
98 	const char *spcl_name;	/* device name */
99 	dev_t spcl_rdev;	/* matching major/minor devnum */
100 	dev_t spcl_fsdev;	/* devnum of containing FS */
101 	ino_t spcl_inum;	/* inum of entry in FS */
102 } spcl_t;
103 
104 static int srch_dir(const entry_t path, int match_mask, int depth,
105     const entry_t skip_dirs[], struct stat64 *fsb);
106 static const entry_t *get_pri_dirs(void);
107 static char *ispts(struct stat64 *fsb, int match_mask);
108 static char *ispty(struct stat64 *fsb, int match_mask);
109 static void itoa(int i, char *ptr);
110 static char *_ttyname_common(struct stat64 *fsp, char *buffer,
111     uint_t match_mask);
112 
113 
114 #define	MAX_DEV_PATH	TTYNAME_MAX
115 #define	MAX_SRCH_DEPTH	4
116 
117 #define	MATCH_MM	1
118 #define	MATCH_FS	2
119 #define	MATCH_INO	4
120 #define	MATCH_ALL	7
121 
122 #define	DEV		"/dev"
123 #define	TTYSRCH		"/etc/ttysrch"
124 #define	PTS		"/dev/pts"
125 
126 static const entry_t dev_dir =
127 	{ "/dev", MATCH_ALL };
128 
129 static const entry_t def_srch_dirs[] = {	/* default search list */
130 	{ "/dev/pts", MATCH_ALL },
131 	{ "/dev/term", MATCH_ALL },
132 	{ "/dev/zcons", MATCH_ALL },
133 	{ NULL, 0 }
134 };
135 
136 static char *dir_buf;		/* directory buffer for ttysrch body */
137 static entry_t *dir_vec;	/* directory vector for ttysrch ptrs */
138 static size_t dir_size;		/* ttysrch file size */
139 static timestruc_t dir_mtim;	/* ttysrch file modification time */
140 static char rbuf[MAX_DEV_PATH]; /* perfect match file name */
141 static char dev_rbuf[MAX_DEV_PATH]; /* partial match file name */
142 static int dev_flag;		/* if set, dev + rdev match was found */
143 static spcl_t special_case[] = {
144 	"/dev/tty", 0, 0, 0,
145 	"/dev/console", 0, 0, 0,
146 	"/dev/conslog", 0, 0, 0,
147 	"/dev/syscon", 0, 0, 0,
148 	"/dev/systty", 0, 0, 0,
149 	"/dev/wscons", 0, 0, 0
150 };
151 #define	NUMSPECIAL	(sizeof (special_case) / sizeof (spcl_t))
152 static spcl_t ptmspecial = {
153 	"/dev/ptmx", 0, 0, 0
154 };
155 static	dev_t	ptcdev = NODEV;
156 static	dev_t	ptsldev = NODEV;
157 
158 char *
159 _ttyname_dev(dev_t rdev, char *buffer, size_t buflen)
160 {
161 	struct stat64 fsb;
162 
163 	fsb.st_rdev = rdev;
164 
165 	if (buflen < MAX_DEV_PATH) {
166 		errno = ERANGE;
167 		return (NULL);
168 	}
169 
170 	return (_ttyname_common(&fsb, buffer, MATCH_MM));
171 }
172 
173 /*
174  * POSIX.1c Draft-6 version of the function ttyname_r.
175  * It was implemented by Solaris 2.3.
176  */
177 char *
178 _ttyname_r(int f, char *buffer, int buflen)
179 {
180 	struct stat64 fsb;	/* what we are searching for */
181 	/*
182 	 * do we need to search anything at all? (is fildes a char special tty
183 	 * file?)
184 	 */
185 	if (fstat64(f, &fsb) < 0) {
186 		errno = EBADF;
187 		return (0);
188 	}
189 	if ((isatty(f) == 0) ||
190 	    ((fsb.st_mode & S_IFMT) != S_IFCHR)) {
191 		errno = ENOTTY;
192 		return (0);
193 	}
194 
195 	if (buflen < MAX_DEV_PATH) {
196 		errno = ERANGE;
197 		return (0);
198 	}
199 
200 	return (_ttyname_common(&fsb, buffer, MATCH_ALL));
201 }
202 
203 static char *
204 _ttyname_common(struct stat64 *fsp, char *buffer, uint_t match_mask)
205 {
206 	struct stat64 tfsb;
207 	const entry_t *srch_dirs;	/* priority directories */
208 	spcl_t *spclp;
209 	int i;
210 	int found = 0;
211 	int dirno = 0;
212 	int is_pts = 0;
213 	char *retval = NULL;
214 	char *pt = NULL;
215 
216 	/*
217 	 * We can't use lmutex_lock() here because we call malloc()/free()
218 	 * and _libc_gettext().  Use the brute-force fork_lock_enter().
219 	 */
220 	(void) fork_lock_enter(NULL);
221 
222 	/*
223 	 * match special cases
224 	 */
225 
226 	for (spclp = special_case, i = 0; i < NUMSPECIAL; spclp++, i++) {
227 		if ((spclp->spcl_inum | spclp->spcl_fsdev |
228 		    spclp->spcl_rdev) == 0) {
229 			if (stat64(spclp->spcl_name, &tfsb) != 0)
230 				continue;
231 			spclp->spcl_rdev = tfsb.st_rdev;
232 			spclp->spcl_fsdev = tfsb.st_dev;
233 			spclp->spcl_inum = tfsb.st_ino;
234 		}
235 		if (match_mask == MATCH_MM) {
236 			if (spclp->spcl_rdev == fsp->st_rdev) {
237 				retval = strcpy(rbuf, spclp->spcl_name);
238 				goto out;
239 			}
240 		} else if (spclp->spcl_fsdev == fsp->st_dev &&
241 		    spclp->spcl_rdev == fsp->st_rdev &&
242 		    spclp->spcl_inum == fsp->st_ino) {
243 			retval = strcpy(rbuf, spclp->spcl_name);
244 			goto out;
245 		}
246 	}
247 	/*
248 	 * additional special case: ptm clone device
249 	 *   ptm devs have no entries in /dev
250 	 *   if major number matches, just short circuit any further lookup
251 	 *   NOTE: the minor number of /dev/ptmx is the ptm major number
252 	 */
253 	spclp = &ptmspecial;
254 	if ((spclp->spcl_inum | spclp->spcl_fsdev | spclp->spcl_rdev) == 0) {
255 		if (stat64(spclp->spcl_name, &tfsb) == 0) {
256 			spclp->spcl_rdev = tfsb.st_rdev;
257 			spclp->spcl_fsdev = tfsb.st_dev;
258 			spclp->spcl_inum = tfsb.st_ino;
259 		}
260 	}
261 	if ((spclp->spcl_rdev != 0) &&
262 	    (minor(spclp->spcl_rdev) == major(fsp->st_rdev)))
263 		goto out;
264 
265 	/*
266 	 * additional special case: pty dev
267 	 *  one of the known default pairs of /dev/ptyXX or /dev/ttyXX
268 	 */
269 	if ((retval = ispty(fsp, match_mask)) != NULL)
270 		goto out;
271 
272 	/*
273 	 * search the priority directories
274 	 */
275 
276 
277 	srch_dirs = get_pri_dirs();
278 	dev_flag = 0;
279 
280 	while ((!found) && (srch_dirs[dirno].name != NULL)) {
281 
282 		/*
283 		 * if /dev is one of the priority directories, only
284 		 * search its top level(set depth = MAX_SEARCH_DEPTH)
285 		 */
286 
287 		/*
288 		 * Is /dev/pts then just do a quick check. We don't have
289 		 * to stat the entire /dev/pts dir.
290 		 */
291 		if (strcmp(PTS, srch_dirs[dirno].name) == NULL) {
292 			if ((pt = ispts(fsp, match_mask)) != NULL) {
293 				is_pts = 1;
294 				found = 1;
295 			}
296 		} else {
297 			found = srch_dir(srch_dirs[dirno], match_mask,
298 				((strcmp(srch_dirs[dirno].name,
299 				dev_dir.name) == 0) ?
300 				MAX_SRCH_DEPTH : 1), 0, fsp);
301 		}
302 		dirno++;
303 	}
304 
305 	/*
306 	 * search the /dev/ directory, skipping priority directories
307 	 */
308 	if (!found)
309 		found = srch_dir(dev_dir, match_mask, 0, srch_dirs, fsp);
310 
311 
312 	/*
313 	 * return
314 	 */
315 
316 	if (found) {
317 		if (is_pts)
318 			retval = pt;
319 		else
320 			retval = rbuf;
321 	} else if (dev_flag)
322 		retval = dev_rbuf;
323 	else
324 		retval = NULL;
325 out:	retval = (retval ? strcpy(buffer, retval) : NULL);
326 	fork_lock_exit();
327 	return (retval);
328 }
329 
330 /*
331  * POSIX.1c standard version of the function ttyname_r.
332  * User gets it via static ttyname_r from the header file.
333  */
334 int
335 __posix_ttyname_r(int fildes, char *name, size_t namesize)
336 {
337 	int nerrno = 0;
338 	int oerrno = errno;
339 	int namelen;
340 
341 	errno = 0;
342 
343 	if (namesize > INT_MAX)
344 		namelen = INT_MAX;
345 	else
346 		namelen = (int)namesize;
347 
348 	if (_ttyname_r(fildes, name, namelen) == NULL) {
349 		if (errno == 0)
350 			nerrno = EINVAL;
351 		else
352 			nerrno = errno;
353 	}
354 	errno = oerrno;
355 	return (nerrno);
356 }
357 
358 /*
359  * Checks if the name is under /dev/pts directory
360  */
361 static char *
362 ispts(struct stat64 *fsb, int match_mask)
363 {
364 	static  char	buf[MAX_DEV_PATH];
365 	struct	stat64	stb;
366 
367 	(void) strcpy(buf, "/dev/pts/");
368 	itoa(minor(fsb->st_rdev), buf+strlen(buf));
369 
370 	if (stat64(buf, &stb) != 0)
371 		return (NULL);
372 
373 	if (match_mask == MATCH_MM) {
374 		if (stb.st_rdev == fsb->st_rdev)
375 			return (buf);
376 	} else if (stb.st_rdev == fsb->st_rdev &&
377 		stb.st_dev == fsb->st_dev &&
378 		stb.st_ino == fsb->st_ino)
379 			return (buf);
380 
381 	return (NULL);
382 }
383 
384 /*
385  * Checks if the dev is a known pty master or slave device
386  */
387 #define	MAXDEFAULTPTY	48
388 
389 static char *
390 ispty(struct stat64 *fsb, int match_mask)
391 {
392 	static char	buf[16];	/* big enough for "/dev/XtyXX" */
393 	struct	stat64	stb;
394 	minor_t dmin;
395 	char prefix;
396 
397 	if (ptsldev == NODEV && stat64("/dev/ttyp0", &stb) == 0)
398 		ptsldev = stb.st_rdev;
399 
400 	/*
401 	 * check for a ptsl dev (/dev/ttyXX)
402 	 */
403 	prefix = 't';
404 	if (major(fsb->st_rdev) != major(ptsldev)) {
405 		/*
406 		 * not a ptsl, check for a ptc
407 		 */
408 		if (ptcdev == NODEV && stat64("/dev/ptyp0", &stb) == 0)
409 			ptcdev = stb.st_rdev;
410 
411 		/*
412 		 * check for a ptc dev (/dev/ptyXX)
413 		 */
414 		prefix = 'p';
415 		if (major(fsb->st_rdev) != major(ptcdev))
416 			return (NULL);
417 	}
418 
419 	/*
420 	 * check if minor number is in the known range
421 	 */
422 	dmin = minor(fsb->st_rdev);
423 	if (dmin > MAXDEFAULTPTY)
424 		return (NULL);
425 
426 	/*
427 	 * modify name based on minor number
428 	 */
429 	(void) snprintf(buf, sizeof (buf), "/dev/%cty%c%c",
430 	    prefix, 'p' + dmin / 16, "0123456789abcdef"[dmin % 16]);
431 
432 	if (stat64(buf, &stb) != 0)
433 		return (NULL);
434 
435 	if (match_mask == MATCH_MM) {
436 		if (stb.st_rdev == fsb->st_rdev)
437 			return (buf);
438 	} else if (stb.st_rdev == fsb->st_rdev &&
439 		stb.st_dev == fsb->st_dev &&
440 		stb.st_ino == fsb->st_ino)
441 			return (buf);
442 
443 	return (NULL);
444 }
445 
446 
447 /*
448  * Converts a number to a string (null terminated).
449  */
450 static void
451 itoa(int i, char *ptr)
452 {
453 	int dig = 0;
454 	int tempi;
455 
456 	tempi = i;
457 	do {
458 		dig++;
459 		tempi /= 10;
460 	} while (tempi);
461 
462 	ptr += dig;
463 	*ptr = '\0';
464 	while (--dig >= 0) {
465 		*(--ptr) = i % 10 + '0';
466 		i /= 10;
467 	}
468 }
469 
470 /*
471  * srch_dir() searches directory path and all directories under it up
472  * to depth directories deep for a file described by a stat structure
473  * fsb.  It puts the answer into rbuf.  If a match is found on device
474  * number only, the file name is put into dev_rbuf and dev_flag is set.
475  *
476  * srch_dir() returns 1 if a match (on device and inode) is found,
477  * or 0 otherwise.
478  *
479  */
480 
481 static int
482 srch_dir(const entry_t path,	/* current path */
483 	int match_mask,		/* flags mask */
484 	int depth,		/* current depth (/dev = 0) */
485 	const entry_t skip_dirs[], /* directories not needing searching */
486 	struct stat64 *fsb)	/* the file being searched for */
487 {
488 	DIR *dirp;
489 	struct dirent64 *direntp;
490 	struct stat64 tsb;
491 	char file_name[MAX_DEV_PATH];
492 	entry_t file;
493 	char *last_comp;
494 	int found = 0;
495 	int dirno = 0;
496 	size_t path_len;
497 
498 	file.name = file_name;
499 	file.flags = path.flags & match_mask;
500 	if (file.flags == 0)
501 		file.flags = match_mask;
502 
503 	/*
504 	 * do we need to search this directory? (always search /dev at depth 0)
505 	 */
506 	if ((skip_dirs != NULL) && (depth != 0))
507 		while (skip_dirs[dirno].name != NULL)
508 			if (strcmp(skip_dirs[dirno++].name, path.name) == 0)
509 				return (0);
510 
511 	/*
512 	 * open directory
513 	 */
514 	if ((dirp = opendir(path.name)) == NULL) {
515 		return (0);
516 	}
517 
518 	/*
519 	 * skip two first entries ('.' and '..')
520 	 */
521 	if (((direntp = readdir64(dirp)) == NULL) ||
522 	    ((direntp = readdir64(dirp)) == NULL)) {
523 		(void) closedir(dirp);
524 		return (0);
525 	}
526 
527 	path_len = strlen(path.name);
528 	(void) strcpy(file_name, path.name);
529 	last_comp = file_name + path_len;
530 	*last_comp++ = '/';
531 
532 	/*
533 	 * read thru the directory
534 	 */
535 	while ((!found) && ((direntp = readdir64(dirp)) != NULL)) {
536 
537 		/*
538 		 * if the file name (path + "/" + d_name + NULL) would be too
539 		 * long, skip it
540 		 */
541 		if ((path_len + strlen(direntp->d_name) + 2) > MAX_DEV_PATH)
542 			continue;
543 		else
544 			(void) strcpy(last_comp, direntp->d_name);
545 
546 		if (stat64(file_name, &tsb) < 0)
547 			continue;
548 
549 		/*
550 		 * if a file is a directory and we are not too deep, recurse
551 		 */
552 		if ((tsb.st_mode & S_IFMT) == S_IFDIR)
553 			if (depth < MAX_SRCH_DEPTH)
554 				found = srch_dir(file, match_mask, depth+1,
555 						skip_dirs, fsb);
556 			else
557 				continue;
558 
559 		/*
560 		 * else if it is not a directory, is it a character special
561 		 * file?
562 		 */
563 		else if ((tsb.st_mode & S_IFMT) == S_IFCHR) {
564 			int flag = 0;
565 			if (tsb.st_dev == fsb->st_dev)
566 				flag |= MATCH_FS;
567 			if (tsb.st_rdev == fsb->st_rdev)
568 				flag |= MATCH_MM;
569 			if (tsb.st_ino == fsb->st_ino)
570 				flag |= MATCH_INO;
571 
572 			if ((flag & file.flags) == file.flags) {
573 				(void) strcpy(rbuf, file.name);
574 				found = 1;
575 			} else if ((flag & (MATCH_MM | MATCH_FS)) ==
576 					(MATCH_MM | MATCH_FS)) {
577 
578 				/*
579 				 * no (inodes do not match), but save the name
580 				 * for later
581 				 */
582 				(void) strcpy(dev_rbuf, file.name);
583 				dev_flag = 1;
584 			}
585 		}
586 	}
587 	(void) closedir(dirp);
588 	return (found);
589 }
590 
591 
592 /*
593  * get_pri_dirs() - returns a pointer to an array of strings, where each string
594  * is a priority directory name.  The end of the array is marked by a NULL
595  * pointer.  The priority directories' names are obtained from the file
596  * /etc/ttysrch if it exists and is readable, or if not, a default hard-coded
597  * list of directories.
598  *
599  * /etc/ttysrch, if used, is read in as a string of characters into memory and
600  * then parsed into strings of priority directory names, omitting comments and
601  * blank lines.
602  *
603  */
604 
605 #define	START_STATE	1
606 #define	COMMENT_STATE	2
607 #define	DIRNAME_STATE	3
608 #define	FLAG_STATE	4
609 #define	CHECK_STATE	5
610 
611 #define	COMMENT_CHAR	'#'
612 #define	EOLN_CHAR	'\n'
613 
614 static const entry_t *
615 get_pri_dirs(void)
616 {
617 	int fd, state;
618 	size_t sz;
619 	ssize_t size;
620 	struct stat64 sb;
621 	char *buf, *ebuf;
622 	entry_t *vec;
623 
624 	/*
625 	 * if no /etc/ttysrch, use defaults
626 	 */
627 	if ((fd = open(TTYSRCH, 0)) < 0)
628 		return (def_srch_dirs);
629 
630 	if (fstat64(fd, &sb) < 0) {
631 		(void) close(fd);
632 		return (def_srch_dirs);
633 	}
634 
635 	sz = (size_t)sb.st_size;
636 	if (dir_vec != NULL && sz == dir_size &&
637 	    sb.st_mtim.tv_sec == dir_mtim.tv_sec &&
638 	    sb.st_mtim.tv_nsec == dir_mtim.tv_nsec) {
639 		/*
640 		 * size & modification time match
641 		 * no need to reread TTYSRCH
642 		 * just return old pointer
643 		 */
644 		(void) close(fd);
645 		return (dir_vec);
646 	}
647 	buf = realloc(dir_buf, sz + 1);
648 	if (buf != NULL) {
649 		dir_buf = buf;
650 		size = read(fd, dir_buf, sz);
651 	}
652 	(void) close(fd);
653 
654 	if (buf == NULL || size < 0) {
655 		if (dir_vec != NULL) {
656 			free(dir_vec);
657 			dir_vec = NULL;
658 		}
659 		return ((entry_t *)def_srch_dirs);
660 	}
661 	dir_size = sz;
662 	dir_mtim = sb.st_mtim;
663 
664 	/*
665 	 * ensure newline termination for buffer.  Add an extra
666 	 * entry to dir_vec for null terminator
667 	 */
668 	ebuf = &dir_buf[size];
669 	*ebuf++ = '\n';
670 	for (sz = 1, buf = dir_buf; buf < ebuf; ++buf)
671 		if (*buf == '\n')
672 			++sz;
673 
674 	sz *= sizeof (*dir_vec);
675 	vec = realloc(dir_vec, sz);
676 	if (vec == NULL) {
677 		if (dir_vec != NULL) {
678 			free(dir_vec);
679 			dir_vec = NULL;
680 		}
681 		return (def_srch_dirs);
682 	}
683 	dir_vec = vec;
684 	state = START_STATE;
685 	for (buf = dir_buf; buf < ebuf; ++buf) {
686 		switch (state) {
687 
688 		case START_STATE:
689 			if (*buf == COMMENT_CHAR) {
690 				state = COMMENT_STATE;
691 				break;
692 			}
693 			if (!isspace(*buf))	/* skip leading white space */
694 				state = DIRNAME_STATE;
695 				vec->name = buf;
696 				vec->flags = 0;
697 			break;
698 
699 		case COMMENT_STATE:
700 			if (*buf == EOLN_CHAR)
701 				state = START_STATE;
702 			break;
703 
704 		case DIRNAME_STATE:
705 			if (*buf == EOLN_CHAR) {
706 				state = CHECK_STATE;
707 				*buf = '\0';
708 			} else if (isspace(*buf)) {
709 				/* skip trailing white space */
710 				state = FLAG_STATE;
711 				*buf = '\0';
712 			}
713 			break;
714 
715 		case FLAG_STATE:
716 			switch (*buf) {
717 				case 'M':
718 					vec->flags |= MATCH_MM;
719 					break;
720 				case 'F':
721 					vec->flags |= MATCH_FS;
722 					break;
723 				case 'I':
724 					vec->flags |= MATCH_INO;
725 					break;
726 				case EOLN_CHAR:
727 					state = CHECK_STATE;
728 					break;
729 			}
730 			break;
731 
732 		case CHECK_STATE:
733 			if (strncmp(vec->name, DEV, strlen(DEV)) != 0) {
734 				int tfd = open("/dev/console", O_WRONLY);
735 				if (tfd >= 0) {
736 					char buf[256];
737 					/* LINTED variable format specifier */
738 					(void) snprintf(buf, sizeof (buf),
739 						_libc_gettext(
740 "ERROR: Entry '%s' in /etc/ttysrch ignored.\n"),
741 						vec->name);
742 					(void) write(tfd, buf, strlen(buf));
743 					(void) close(tfd);
744 				}
745 			} else {
746 				char *slash;
747 				slash = vec->name + strlen(vec->name) - 1;
748 				while (*slash == '/')
749 					*slash-- = '\0';
750 				if (vec->flags == 0)
751 					vec->flags = MATCH_ALL;
752 				vec++;
753 			}
754 			state = START_STATE;
755 			/*
756 			 * This state does not consume a character, so
757 			 * reposition the pointer.
758 			 */
759 			buf--;
760 			break;
761 
762 		}
763 	}
764 	vec->name = NULL;
765 	return (dir_vec);
766 }
767 
768 
769 char *
770 ttyname(int f)
771 {
772 	char *ans = tsdalloc(_T_TTYNAME, MAX_DEV_PATH, NULL);
773 
774 	if (ans == NULL)
775 		return (NULL);
776 	return (_ttyname_r(f, ans, MAX_DEV_PATH));
777 }
778