2 * Copyright (c) 2006 Cisco Systems, Inc. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
38 #include <sys/types.h>
42 #include <sys/sysctl.h>
46 static const char *sysfs_path;
48 const char *ibv_get_sysfs_path(void)
50 const char *env = NULL;
56 * Only follow use path passed in through the calling user's
57 * environment if we're not running SUID.
59 if (getuid() == geteuid())
60 env = getenv("SYSFS_PATH");
66 sysfs_path = dup = strndup(env, IBV_SYSFS_PATH_MAX);
68 while (len > 0 && dup[len - 1] == '/') {
78 int ibv_read_sysfs_file(const char *dir, const char *file,
79 char *buf, size_t size)
85 if (asprintf(&path, "%s/%s", dir, file) < 0)
88 for (s = &path[0]; *s != '\0'; s++)
93 if (sysctlbyname(&path[1], buf, &len, NULL, 0) == -1)
98 if (len > 0 && buf[len - 1] == '\n')