4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * (C) Copyright (c) 2015, Cray Inc, all rights reserved.
8 * Copyright (c) 2016 Intel Corporation.
10 * All rights reserved. This program and the accompanying materials
11 * are made available under the terms of the GNU Lesser General Public License
12 * LGPL version 2.1 or (at your discretion) any later version.
13 * LGPL version 2.1 accompanies this distribution, and is available at
14 * http://www.gnu.org/licenses/lgpl-2.1.html
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
24 * lustre/utils/liblustreapi_util.c
26 * Misc LGPL-licenced utility functions for liblustreapi.
28 * Author: Frank Zago <fzago@cray.com>
40 #include <sys/types.h>
42 #include <sys/syscall.h>
43 #include <lustre/lustreapi.h>
44 #include <libcfs/util/string.h> /* only needed for compat strlcpy() */
45 #include <lustre_ver.h> /* only until LUSTRE_VERSION_CODE is gone */
46 #include "lustreapi_internal.h"
49 * Indicate whether the liblustreapi_init() constructor below has run or not.
51 * This can be used by external programs to ensure that the initialization
52 * mechanism has actually worked.
54 bool liblustreapi_initialized;
58 * Initialize the library once at startup.
60 * Initializes the random number generator (random()). Get
61 * data from different places in case one of them fails. This
62 * is enough to get reasonably random numbers, but is not
63 * strong enough to be used for cryptography.
65 static __attribute__ ((constructor)) void liblustreapi_init(void)
71 seed = syscall(SYS_gettid);
73 if (gettimeofday(&tv, NULL) == 0) {
78 fd = open("/dev/urandom", O_RDONLY | O_NOFOLLOW);
83 ret = read(fd, &rnumber, sizeof(rnumber));
84 seed ^= rnumber ^ ret;
89 liblustreapi_initialized = true;
93 * Return the release version for the Lustre modules, e.g. 2.6.92.
95 * The "version" file in /proc currently returns only the line:
98 * but in the past it also returned more lines that should be ignored:
99 * kernel: patchless_client
100 * build: v2_6_92_0-gadb3ee4-2.6.32-431.29.2.el6_lustre.g36cd22b.x86_64
102 * \param version[in,out] buffer to store build version string
103 * \param version_size[in] size of \a version
105 * \retval 0 on success
106 * \retval -1 on failure, errno set
108 int llapi_get_version_string(char *version, unsigned int version_size)
114 if (version == NULL || version_size == 0) {
119 rc = get_lustre_param_value(NULL, NULL, FILTER_BY_NONE, buffer,
120 "version", sizeof(buffer));
126 ptr = strstr(buffer, "lustre:");
128 ptr += strlen("lustre:");
129 while (*ptr == ' ' || *ptr == '\t')
134 llapi_chomp_string(ptr);
136 if (ptr[0] == '\0') {
141 if (strlcpy(version, ptr, version_size) >= version_size) {
148 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 4, 53, 0)
150 * Return the build version of the Lustre code.
152 * The **version argument is pointless, so llapi_get_version_string() is
153 * better to use in the future, but give users a few versions to fix * it.
155 * \param buffer[in] temporary buffer to hold version string
156 * \param buffer_size[in] length of the \a buffer
157 * \param version[out] pointer to the start of build version string
159 * \retval 0 on success
160 * \retval -ve errno on failure
162 int llapi_get_version(char *buffer, int buffer_size, char **version)
165 #if LUSTRE_VERSION_CODE > OBD_OCD_VERSION(2, 8, 53, 0)
169 "%s deprecated, use llapi_get_version_string()\n",
175 rc = llapi_get_version_string(buffer, buffer_size);
176 /* keep old return style for this legacy function */
184 #endif /* LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 4, 53, 0) */