mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-08-28 19:41:16 +00:00
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*
|
|
* memory.c: safer memory allocation
|
|
*
|
|
* Copyright (C) 2008 Daniel P. Berrange
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
|
|
#ifndef __VIR_MEMORY_H_
|
|
#define __VIR_MEMORY_H_
|
|
|
|
#include "internal.h"
|
|
|
|
/* Return 1 if an array of N objects, each of size S, cannot exist due
|
|
to size arithmetic overflow. S must be positive and N must be
|
|
nonnegative. This is a macro, not an inline function, so that it
|
|
works correctly even when SIZE_MAX < N.
|
|
|
|
By gnulib convention, SIZE_MAX represents overflow in size
|
|
calculations, so the conservative dividend to use here is
|
|
SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
|
|
However, malloc (SIZE_MAX) fails on all known hosts where
|
|
sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
|
|
exactly-SIZE_MAX allocations on such hosts; this avoids a test and
|
|
branch when S is known to be 1. */
|
|
#ifndef xalloc_oversized
|
|
# define xalloc_oversized(n, s) \
|
|
((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
|
|
#endif
|
|
|
|
|
|
|
|
/* Don't call these directly - use the macros below */
|
|
int virAlloc(void *ptrptr, size_t size) ATTRIBUTE_RETURN_CHECK;
|
|
int virAllocN(void *ptrptr, size_t size, size_t count) ATTRIBUTE_RETURN_CHECK;
|
|
int virReallocN(void *ptrptr, size_t size, size_t count) ATTRIBUTE_RETURN_CHECK;
|
|
void virFree(void *ptrptr);
|
|
|
|
/**
|
|
* VIR_ALLOC:
|
|
* @ptr: pointer to hold address of allocated memory
|
|
*
|
|
* Allocate sizeof(*ptr) bytes of memory and store
|
|
* the address of allocated memory in 'ptr'. Fill the
|
|
* newly allocated memory with zeros.
|
|
*
|
|
* Returns -1 on failure, 0 on success
|
|
*/
|
|
#define VIR_ALLOC(ptr) virAlloc(&(ptr), sizeof(*(ptr)))
|
|
|
|
/**
|
|
* VIR_ALLOC_N:
|
|
* @ptr: pointer to hold address of allocated memory
|
|
* @count: number of elements to allocate
|
|
*
|
|
* Allocate an array of 'count' elements, each sizeof(*ptr)
|
|
* bytes long and store the address of allocated memory in
|
|
* 'ptr'. Fill the newly allocated memory with zeros.
|
|
*
|
|
* Returns -1 on failure, 0 on success
|
|
*/
|
|
#define VIR_ALLOC_N(ptr, count) virAllocN(&(ptr), sizeof(*(ptr)), (count))
|
|
|
|
/**
|
|
* VIR_REALLOC_N:
|
|
* @ptr: pointer to hold address of allocated memory
|
|
* @count: number of elements to allocate
|
|
*
|
|
* Re-allocate an array of 'count' elements, each sizeof(*ptr)
|
|
* bytes long and store the address of allocated memory in
|
|
* 'ptr'. Fill the newly allocated memory with zeros
|
|
*
|
|
* Returns -1 on failure, 0 on success
|
|
*/
|
|
#define VIR_REALLOC_N(ptr, count) virReallocN(&(ptr), sizeof(*(ptr)), (count))
|
|
|
|
/**
|
|
* VIR_FREE:
|
|
* @ptr: pointer holding address to be freed
|
|
*
|
|
* Free the memory stored in 'ptr' and update to point
|
|
* to NULL.
|
|
*/
|
|
#define VIR_FREE(ptr) virFree(&(ptr))
|
|
|
|
|
|
#if TEST_OOM
|
|
void virAllocTestInit(void);
|
|
int virAllocTestCount(void);
|
|
void virAllocTestOOM(int n, int m);
|
|
void virAllocTestHook(void (*func)(int, void*), void *data);
|
|
#endif
|
|
|
|
|
|
|
|
#endif /* __VIR_MEMORY_H_ */
|