1 /* (c) 2007,2008 Andrei Nigmatulin, Jerome Loyet */
2
3 #include <sys/mman.h>
4 #include <errno.h>
5 #include <string.h>
6
7 #include "fpm_shm.h"
8 #include "zlog.h"
9
10
11 /* MAP_ANON is deprecated, but not in macosx */
12 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
13 #define MAP_ANONYMOUS MAP_ANON
14 #endif
15
16 static size_t fpm_shm_size = 0;
17
fpm_shm_alloc(size_t size)18 void *fpm_shm_alloc(size_t size) /* {{{ */
19 {
20 void *mem;
21
22 mem = mmap(0, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
23
24 #ifdef MAP_FAILED
25 if (mem == MAP_FAILED) {
26 zlog(ZLOG_SYSERROR, "unable to allocate %zu bytes in shared memory: %s", size, strerror(errno));
27 return NULL;
28 }
29 #endif
30
31 if (!mem) {
32 zlog(ZLOG_SYSERROR, "unable to allocate %zu bytes in shared memory", size);
33 return NULL;
34 }
35
36 fpm_shm_size += size;
37 return mem;
38 }
39 /* }}} */
40
fpm_shm_free(void * mem,size_t size)41 int fpm_shm_free(void *mem, size_t size) /* {{{ */
42 {
43 if (!mem) {
44 zlog(ZLOG_ERROR, "mem is NULL");
45 return 0;
46 }
47
48 if (munmap(mem, size) == -1) {
49 zlog(ZLOG_SYSERROR, "Unable to free shm");
50 return 0;
51 }
52
53 if (fpm_shm_size - size > 0) {
54 fpm_shm_size -= size;
55 } else {
56 fpm_shm_size = 0;
57 }
58
59 return 1;
60 }
61 /* }}} */
62
fpm_shm_get_size_allocated()63 size_t fpm_shm_get_size_allocated() /* {{{*/
64 {
65 return fpm_shm_size;
66 }
67 /* }}} */
68
