我正在测试示例代码,如下所示,为什么在linux ubuntu 16-4上编译时收到警告?
~/c$ gcc malloc.c
malloc.c: In function ‘main’:
malloc.c:17:14: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
if(number= malloc(50*sizeof(int) )== NULL)
这是我的代码:
#include "stdlib.h"
#include "stdio.h
我在malloc()例程中遇到了一个分段错误。下面是来自gdb的堆栈跟踪:
#0 0x00007ffff787e882 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff787fec6 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007ffff7882a45 in malloc () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x0000000000403ab0 in xmalloc (size=1024) at gl
我和Axis2C一起工作。为了测试这个框架,我用一个简单的web服务客户端做了一些测试。
我使用Apache提供的一些示例和文档编写了客户端。客户端运行良好,我决定使用valgrind对其进行测试,以确保内存管理是正确的。
我使用了示例和文档中提到的函数来释放内存(在本例中):
// to free the requst struct.
adb_EncryptRequest_free(request, env);
// to free the stub.
axis2_stub_free(stub, env);
// to free the environment.
axutil_
我试图为python (Ubuntu18.04Linux)中的malloc创建的空间分配一个值(字节),但不知道如何.
dllc = CDLL("lib.so.6")
malloc = dll.malloc
malloc.restype = c_void_p
malloc.argtypes = (c_size_t,)
#initialize a pointer using malloc and allocate a space of size 1032
ptr = malloc(1032)
#here is the sample value of size 1032 in
我有一个从源代码构建llvm/clang3.42的脚本(用configure+make)。在ubuntu14.04.5LTS上运行平稳。当我升级到ubuntu17.04时,构建失败了。
这是建筑脚本:
svn co https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_342/final llvm
svn co https://llvm.org/svn/llvm-project/cfe/tags/RELEASE_342/final llvm/tools/clang
svn co https://llvm.org/svn/llvm-project
虽然我的程序编译并开始运行,但由于内存泄漏导致的故障似乎是由于val差生造成的:
==4602== HEAP SUMMARY:
==4602== in use at exit: 4,007,248 bytes in 71,558 blocks
==4602== total heap usage: 71,564 allocs, 6 frees, 4,017,464 bytes allocated
==4602==
==4602== 336 bytes in 6 blocks are still reachable in loss record 1 of 4
==4602==
我对我的记忆有问题。我一直在努力找出出了什么问题,但我似乎找不到。以下是我的问题:
==32233== Invalid write of size 1
==32233== at 0x4C2E1E0: strcpy (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==32233== by 0x4010C7: songCopy (song.c:102)
==32233== by 0x4009E6: main (songtest.c:82)
==32233== Address 0x51fda09 is 0 byte
我有一个控制台程序,它使用一些Qt类。下面的代码是它的片段
std::cout << "before the problem (PVM constructor)" << std::endl;
image = new QImage(filename);
std::cout << "after the problem (PVM constructor)" << std::endl;
对valgrind运行它会抛出一些错误:
before the problem (PVM constructor)
==8344== Co
Program terminated with signal 11, Segmentation fault.
#0 0x0000003663c70485 in malloc_consolidate () from /lib64/libc.so.6
(gdb) bt
#0 0x0000003663c70485 in malloc_consolidate () from /lib64/libc.so.6
#1 0x0000003663c72a6c in _int_malloc () from /lib64/libc.so.6
#2 0x0000003663c74cde in malloc