no need to waste a full page

[xonotic/darkplaces.git] / zone.c

diff --git a/zone.c b/zone.c
index 85a3b2199776b654539afc10499e9b08889fc7ff..207132c100966588adcb7bd36ecc2a14198ed131 100644 (file)
--- a/zone.c
+++ b/zone.c
@@ -111,16 +111,13 @@ typedef struct mmap_data_s
        size_t len;
 }
 mmap_data_t;
-#define MMAP_PAGE_SIZE max(sizeof(mmap_data_t), (size_t)sysconf(_SC_PAGE_SIZE))
 static void *mmap_malloc(size_t size)
 {
        char vabuf[MAX_OSPATH + 1];
        char *tmpdir = getenv("TEMP");
-       unsigned char *data;
+       mmap_data_t *data;
        int fd;
-       size += MMAP_PAGE_SIZE; // waste block
-       size += MMAP_PAGE_SIZE - 1; // also, waste up to this amount for management info
-       size -= (size % MMAP_PAGE_SIZE); // round down
+       size += sizeof(mmap-data_t); // waste block
        dpsnprintf(vabuf, sizeof(vabuf), "%s/darkplaces.XXXXXX", tmpdir ? tmpdir : "/tmp");
        fd = mkstemp(vabuf);
        if(fd < 0)
@@ -131,16 +128,16 @@ static void *mmap_malloc(size_t size)
        unlink(vabuf);
        if(!data)
                return NULL;
-       ((mmap_data_t *) data)->len = size;
-       return (void *) (data + MMAP_PAGE_SIZE);
+       data->len = size;
+       return (void *) (data + 1);
 }
 static void mmap_free(void *mem)
 {
-       unsigned char *data;
+       mmap_data_t *data;
        if(!mem)
                return;
-       data = (unsigned char *) mem - MMAP_PAGE_SIZE;
-       munmap(data, ((mmap_data_t *) data)->len);
+       data = ((mmap_data_t *) mem) - 1;
+       munmap(data, data->len);
 }
 #define malloc mmap_malloc
 #define free mmap_free