* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
167 lines
4.3 KiB
C
167 lines
4.3 KiB
C
/* $NetBSD: devname.c,v 1.22 2012/06/03 21:42:46 joerg Exp $ */
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Simon Burge.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: devname.c,v 1.22 2012/06/03 21:42:46 joerg Exp $");
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#include "namespace.h"
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#include "reentrant.h"
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#include <sys/stat.h>
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#include <cdbr.h>
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#include <errno.h>
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#include <fts.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef __weak_alias
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__weak_alias(devname_r,_devname_r)
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#endif
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static once_t db_opened = ONCE_INITIALIZER;
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static struct cdbr *db;
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static devmajor_t pts;
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static void
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devname_dbopen(void)
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{
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db = cdbr_open(_PATH_DEVCDB, CDBR_DEFAULT);
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pts = getdevmajor("pts", S_IFCHR);
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}
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__CTASSERT(sizeof(dev_t) == 8);
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static int
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devname_dblookup(dev_t dev, mode_t type, char *path, size_t len)
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{
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const void *data;
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size_t datalen;
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uint8_t key[10];
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le64enc(key, dev);
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le16enc(key + 8, type);
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if (cdbr_find(db, key, sizeof(key), &data, &datalen) != 0)
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return ENOENT;
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if (datalen <= sizeof(key))
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return ENOENT;
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if (memcmp(key, data, sizeof(key)) != 0)
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return ENOENT;
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data = (const char *)data + sizeof(key);
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datalen -= sizeof(key);
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if (memchr(data, '\0', datalen) != (const char *)data + datalen - 1)
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return ENOENT;
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if (datalen > len)
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return ERANGE;
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memcpy(path, data, datalen);
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return 0;
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}
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static int
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devname_ptslookup(dev_t dev, mode_t type, char *path, size_t len)
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{
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int rv;
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if (type != S_IFCHR || pts == NODEVMAJOR || major(dev) != pts)
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return ENOENT;
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rv = snprintf(path, len, "%s%d", _PATH_DEV_PTS + sizeof(_PATH_DEV) - 1,
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minor(dev));
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if (rv < 0 || (size_t)rv >= len)
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return ERANGE;
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return 0;
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}
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static int
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devname_fts(dev_t dev, mode_t type, char *path, size_t len)
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{
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FTS *ftsp;
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FTSENT *fe;
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static const char path_dev[] = _PATH_DEV;
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static char * const dirs[2] = { __UNCONST(path_dev), NULL };
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const size_t len_dev = strlen(path_dev);
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int rv;
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if ((ftsp = fts_open(dirs, FTS_NOCHDIR | FTS_PHYSICAL, NULL)) == NULL)
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return ENOENT;
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rv = ENOENT;
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while ((fe = fts_read(ftsp)) != NULL) {
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if (fe->fts_info != FTS_DEFAULT)
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continue;
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if (fe->fts_statp->st_rdev != dev)
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continue;
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if ((type & S_IFMT) != (fe->fts_statp->st_mode & S_IFMT))
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continue;
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if (strncmp(fe->fts_path, path_dev, len_dev))
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continue;
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if (strlcpy(path, fe->fts_path + len_dev, len) < len) {
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rv = 0;
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break;
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}
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}
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fts_close(ftsp);
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return rv;
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}
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int
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devname_r(dev_t dev, mode_t type, char *path, size_t len)
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{
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int rv;
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thr_once(&db_opened, devname_dbopen);
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if (db != NULL) {
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rv = devname_dblookup(dev, type, path, len);
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if (rv == 0 || rv == ERANGE)
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return rv;
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}
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rv = devname_ptslookup(dev, type, path, len);
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if (rv == 0 || rv == ERANGE)
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return rv;
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if (db != NULL)
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return ENOENT;
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rv = devname_fts(dev, type, path, len);
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return rv;
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}
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char *
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devname(dev_t dev, mode_t type)
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{
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static char path[PATH_MAX];
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return devname_r(dev, type, path, sizeof(path)) == 0 ? path : NULL;
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}
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