2 * cache.c - allocation/initialization/free routines for cache
4 * Copyright (C) 2001 Andreas Dilger
5 * Copyright (C) 2003 Theodore Ts'o
8 * This file may be redistributed under the terms of the
9 * GNU Lesser General Public License.
21 #ifdef HAVE_SYS_PRCTL_H
22 #include <sys/prctl.h>
24 #define PR_GET_DUMPABLE 3
26 #if (!defined(HAVE_PRCTL) && defined(linux))
27 #include <sys/syscall.h>
29 #ifdef HAVE_SYS_STAT_H
34 int blkid_debug_mask = 0;
37 static char *safe_getenv(const char *arg)
39 if ((getuid() != geteuid()) || (getgid() != getegid()))
42 if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
45 #if (defined(linux) && defined(SYS_prctl))
46 if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
51 #ifdef HAVE___SECURE_GETENV
52 return __secure_getenv(arg);
58 #if 0 /* ifdef CONFIG_BLKID_DEBUG */
59 static blkid_debug_dump_cache(int mask, blkid_cache cache)
64 printf("cache: NULL\n");
68 printf("cache: time = %lu\n", cache->bic_time);
69 printf("cache: flags = 0x%08X\n", cache->bic_flags);
71 list_for_each(p, &cache->bic_devs) {
72 blkid_dev dev = list_entry(p, struct blkid_struct_dev, bid_devs);
73 blkid_debug_dump_dev(dev);
78 int blkid_get_cache(blkid_cache *ret_cache, const char *filename)
82 #ifdef CONFIG_BLKID_DEBUG
83 if (!(blkid_debug_mask & DEBUG_INIT)) {
84 char *dstr = getenv("BLKID_DEBUG");
87 blkid_debug_mask = strtoul(dstr, 0, 0);
88 blkid_debug_mask |= DEBUG_INIT;
92 DBG(DEBUG_CACHE, printf("creating blkid cache (using %s)\n",
93 filename ? filename : "default cache"));
95 if (!(cache = (blkid_cache) calloc(1, sizeof(struct blkid_struct_cache))))
96 return -BLKID_ERR_MEM;
98 INIT_LIST_HEAD(&cache->bic_devs);
99 INIT_LIST_HEAD(&cache->bic_tags);
101 if (filename && !strlen(filename))
104 filename = safe_getenv("BLKID_FILE");
106 filename = BLKID_CACHE_FILE;
107 cache->bic_filename = blkid_strdup(filename);
109 blkid_read_cache(cache);
115 void blkid_put_cache(blkid_cache cache)
120 (void) blkid_flush_cache(cache);
122 DBG(DEBUG_CACHE, printf("freeing cache struct\n"));
124 /* DBG(DEBUG_CACHE, blkid_debug_dump_cache(cache)); */
126 while (!list_empty(&cache->bic_devs)) {
127 blkid_dev dev = list_entry(cache->bic_devs.next,
128 struct blkid_struct_dev,
133 while (!list_empty(&cache->bic_tags)) {
134 blkid_tag tag = list_entry(cache->bic_tags.next,
135 struct blkid_struct_tag,
138 while (!list_empty(&tag->bit_names)) {
139 blkid_tag bad = list_entry(tag->bit_names.next,
140 struct blkid_struct_tag,
143 DBG(DEBUG_CACHE, printf("warning: unfreed tag %s=%s\n",
144 bad->bit_name, bad->bit_val));
149 if (cache->bic_filename)
150 free(cache->bic_filename);
155 void blkid_gc_cache(blkid_cache cache)
163 list_for_each(p, &cache->bic_devs) {
164 blkid_dev dev = list_entry(p, struct blkid_struct_dev, bid_devs);
167 if (stat(dev->bid_name, &st) < 0) {
169 printf("freeing %s\n", dev->bid_name));
171 cache->bic_flags |= BLKID_BIC_FL_CHANGED;
174 printf("Device %s exists\n", dev->bid_name));
181 int main(int argc, char** argv)
183 blkid_cache cache = NULL;
186 blkid_debug_mask = DEBUG_ALL;
188 fprintf(stderr, "Usage: %s [filename] \n", argv[0]);
192 if ((ret = blkid_get_cache(&cache, argv[1])) < 0) {
193 fprintf(stderr, "error %d parsing cache file %s\n", ret,
194 argv[1] ? argv[1] : BLKID_CACHE_FILE);
197 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
198 fprintf(stderr, "%s: error creating cache (%d)\n",
202 if ((ret = blkid_probe_all(cache) < 0))
203 fprintf(stderr, "error probing devices\n");
205 blkid_put_cache(cache);