ceph/src/dpdk/lib/librte_eal/common/eal_filesystem.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /**
  35  * @file
  36  * Stores functions and path defines for files and directories
  37  * on the filesystem for Linux, that are used by the Linux EAL.
  38  */
  39
  40 #ifndef EAL_FILESYSTEM_H
  41 #define EAL_FILESYSTEM_H
  42
  43 /** Path of rte config file. */
  44 #define RUNTIME_CONFIG_FMT "%s/.%s_config"
  45
  46 #include <stdint.h>
  47 #include <limits.h>
  48 #include <unistd.h>
  49 #include <stdlib.h>
  50
  51 #include <rte_string_fns.h>
  52 #include "eal_internal_cfg.h"
  53
  54 static const char *default_config_dir = "/var/run";
  55
  56 static inline const char *
  57 eal_runtime_config_path(void)
  58 {
  59         static char buffer[PATH_MAX]; /* static so auto-zeroed */
  60         const char *directory = default_config_dir;
  61         const char *home_dir = getenv("HOME");
  62
  63         if (getuid() != 0 && home_dir != NULL)
  64                 directory = home_dir;
  65         snprintf(buffer, sizeof(buffer) - 1, RUNTIME_CONFIG_FMT, directory,
  66                         internal_config.hugefile_prefix);
  67         return buffer;
  68 }
  69
  70 /** Path of hugepage info file. */
  71 #define HUGEPAGE_INFO_FMT "%s/.%s_hugepage_info"
  72
  73 static inline const char *
  74 eal_hugepage_info_path(void)
  75 {
  76         static char buffer[PATH_MAX]; /* static so auto-zeroed */
  77         const char *directory = default_config_dir;
  78         const char *home_dir = getenv("HOME");
  79
  80         if (getuid() != 0 && home_dir != NULL)
  81                 directory = home_dir;
  82         snprintf(buffer, sizeof(buffer) - 1, HUGEPAGE_INFO_FMT, directory,
  83                         internal_config.hugefile_prefix);
  84         return buffer;
  85 }
  86
  87 /** String format for hugepage map files. */
  88 #define HUGEFILE_FMT "%s/%smap_%d"
  89 #define TEMP_HUGEFILE_FMT "%s/%smap_temp_%d"
  90
  91 static inline const char *
  92 eal_get_hugefile_path(char *buffer, size_t buflen, const char *hugedir, int f_id)
  93 {
  94         snprintf(buffer, buflen, HUGEFILE_FMT, hugedir,
  95                         internal_config.hugefile_prefix, f_id);
  96         buffer[buflen - 1] = '\0';
  97         return buffer;
  98 }
  99
 100 /** define the default filename prefix for the %s values above */
 101 #define HUGEFILE_PREFIX_DEFAULT "rte"
 102
 103 /** Function to read a single numeric value from a file on the filesystem.
 104  * Used to read information from files on /sys */
 105 int eal_parse_sysfs_value(const char *filename, unsigned long *val);
 106
 107 #endif /* EAL_FILESYSTEM_H */