lib/dirs.c.in

   1 #line 2 "@srcdir@/lib/dirs.c.in"
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <config.h>
  19 #include "dirs.h"
  20 #include <stdlib.h>
  21 #include "ovs-thread.h"
  22 #include "util.h"
  23
  24 struct directory {
  25     const char *value;          /* Actual value; NULL if not yet determined. */
  26     const char *default_value;  /* Default value. */
  27     const char *var_name;       /* Environment variable to override default. */
  28     struct ovsthread_once once; /* Ensures 'value' gets initialized once. */
  29 };
  30
  31 static const char *
  32 get_dir(struct directory *d)
  33 {
  34     if (ovsthread_once_start(&d->once)) {
  35         d->value = getenv(d->var_name);
  36         if (!d->value || !d->value[0]) {
  37             d->value = d->default_value;
  38         }
  39         ovsthread_once_done(&d->once);
  40     }
  41     return d->value;
  42 }
  43
  44 const char *
  45 ovs_sysconfdir(void)
  46 {
  47     static struct directory d = {
  48         NULL, @sysconfdir@, "OVS_SYSCONFDIR", OVSTHREAD_ONCE_INITIALIZER
  49     };
  50
  51     return get_dir(&d);
  52 }
  53
  54 const char *
  55 ovs_pkgdatadir(void)
  56 {
  57     static struct directory d = {
  58         NULL, @pkgdatadir@, "OVS_PKGDATADIR", OVSTHREAD_ONCE_INITIALIZER
  59     };
  60
  61     return get_dir(&d);
  62 }
  63
  64 const char *
  65 ovs_rundir(void)
  66 {
  67     static struct directory d = {
  68         NULL, @RUNDIR@, "OVS_RUNDIR", OVSTHREAD_ONCE_INITIALIZER
  69     };
  70
  71     return get_dir(&d);
  72 }
  73
  74 const char *
  75 ovs_logdir(void)
  76 {
  77     static struct directory d = {
  78         NULL, @LOGDIR@, "OVS_LOGDIR", OVSTHREAD_ONCE_INITIALIZER
  79     };
  80
  81     return get_dir(&d);
  82 }
  83
  84 const char *
  85 ovs_dbdir(void)
  86 {
  87     static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
  88     static const char *dbdir;
  89
  90     if (ovsthread_once_start(&once)) {
  91         dbdir = getenv("OVS_DBDIR");
  92         if (!dbdir || !dbdir[0]) {
  93             char *sysconfdir = getenv("OVS_SYSCONFDIR");
  94
  95             dbdir = (sysconfdir
  96                      ? xasprintf("%s/openvswitch", sysconfdir)
  97                      : @DBDIR@);
  98         }
  99         ovsthread_once_done(&once);
 100     }
 101     return dbdir;
 102 }
 103
 104 const char *
 105 ovs_bindir(void)
 106 {
 107     static struct directory d = {
 108         NULL, @bindir@, "OVS_BINDIR", OVSTHREAD_ONCE_INITIALIZER
 109     };
 110
 111     return get_dir(&d);
 112 }