[uClibc] malloc-simple munmap fix
Yoshinori Sato
ysato at users.sourceforge.jp
Mon Jun 6 15:13:48 UTC 2005
Don't forgive that length of munmap is "0" in current nommu.
This purpose cannot free memory area really.
It is a patch to work out a solution.
--- alloc.c~ 2005-06-06 15:10:21.000000000 +0900
+++ alloc.c 2005-06-07 00:02:51.000000000 +0900
@@ -32,19 +32,17 @@
}
#ifdef __ARCH_HAS_MMU__
+#define MMAP_FLAGS MAP_PRIVATE | MAP_ANONYMOUS
+#else
+#define MMAP_FLAGS MAP_SHARED | MAP_ANONYMOUS
+#endif
+
result = mmap((void *) 0, size + sizeof(size_t), PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+ MMAP_FLAGS, 0, 0);
if (result == MAP_FAILED)
return 0;
* (size_t *) result = size;
return(result + sizeof(size_t));
-#else
- result = mmap((void *) 0, size, PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_ANONYMOUS, 0, 0);
- if (result == MAP_FAILED)
- return 0;
- return(result);
-#endif
}
#endif
@@ -88,11 +86,7 @@
newptr = malloc(size);
if (newptr) {
memcpy(newptr, ptr,
-#ifdef __ARCH_HAS_MMU__
*((size_t *) (ptr - sizeof(size_t)))
-#else
- size
-#endif
);
free(ptr);
}
@@ -111,12 +105,8 @@
return;
}
}
-#ifdef __ARCH_HAS_MMU__
ptr -= sizeof(size_t);
munmap(ptr, * (size_t *) ptr + sizeof(size_t));
-#else
- munmap(ptr, 0);
-#endif
}
#endif
@@ -154,12 +144,8 @@
/* Mark the block as free */
l->aligned = NULL;
ptr = l->exact;
-#ifdef __ARCH_HAS_MMU__
ptr -= sizeof(size_t);
munmap(ptr, * (size_t *) ptr + sizeof(size_t));
-#else
- munmap(ptr, 0);
-#endif
return 1;
}
}
--
Yoshinori Sato
<ysato at users.sourceforge.jp>
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