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/* $Id: fpm_shm.c,v 1.3 2008/05/24 17:38:47 anight Exp $ */
/* (c) 2007,2008 Andrei Nigmatulin, Jerome Loyet */
#include <sys/mman.h>
#include <errno.h>
#include <string.h>
#include "fpm_shm.h"
#include "zlog.h"
/* MAP_ANON is deprecated, but not in macosx */
#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
#define MAP_ANONYMOUS MAP_ANON
#endif
static size_t fpm_shm_size = 0;
void *fpm_shm_alloc(size_t size) /* {{{ */
{
void *mem;
mem = mmap(0, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
#ifdef MAP_FAILED
if (mem == MAP_FAILED) {
zlog(ZLOG_SYSERROR, "unable to allocate %zu bytes in shared memory: %s", size, strerror(errno));
return NULL;
}
#endif
if (!mem) {
zlog(ZLOG_SYSERROR, "unable to allocate %zu bytes in shared memory", size);
return NULL;
}
memset(mem, 0, size);
fpm_shm_size += size;
return mem;
}
/* }}} */
int fpm_shm_free(void *mem, size_t size) /* {{{ */
{
if (!mem) {
zlog(ZLOG_ERROR, "mem is NULL");
return 0;
}
if (munmap(mem, size) == -1) {
zlog(ZLOG_SYSERROR, "Unable to free shm");
return 0;
}
if (fpm_shm_size - size > 0) {
fpm_shm_size -= size;
} else {
fpm_shm_size = 0;
}
return 1;
}
/* }}} */
size_t fpm_shm_get_size_allocated() /* {{{*/
{
return fpm_shm_size;
}
/* }}} */