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当我使用 MTrace 检测 ALSA 官方网站上的 ALSA 示例项目中的内存泄漏时，它显示了很多内存泄漏信息。
示例项目的网站在这里！
我只是添加了一些 MTrace 代码。 

#include <alsa/asoundlib.h>
#include <mcheck.h>

static char *device = "default";                        /* playback device */
snd_output_t *output = NULL;
unsigned char buffer[16*1024];                          /* some random data */
int main(void)
{
    mtrace();
    int err;
    unsigned int i;
    snd_pcm_t *handle;
    snd_pcm_sframes_t frames;
    for (i = 0; i < sizeof(buffer); i++)
            buffer[i] = random() & 0xff;
    if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
            printf("Playback open error: %s\n", snd_strerror(err));
            exit(EXIT_FAILURE);
    }
    if ((err = snd_pcm_set_params(handle,
                                    SND_PCM_FORMAT_U8,
                                    SND_PCM_ACCESS_RW_INTERLEAVED,
                                    1,
                                    48000,
                                    1,
                                    500000)) < 0) {   /* 0.5sec */
            printf("Playback open error: %s\n", snd_strerror(err));
            exit(EXIT_FAILURE);
    }
    for (i = 0; i < 16; i++) {
            frames = snd_pcm_writei(handle, buffer, sizeof(buffer));
            if (frames < 0)
                    frames = snd_pcm_recover(handle, frames, 0);
            if (frames < 0) {
                    printf("snd_pcm_writei failed: %s\n", snd_strerror(frames));
                    break;
            }
            if (frames > 0 && frames < (long)sizeof(buffer))
                    printf("Short write (expected %li, wrote %li)\n", (long)sizeof(buffer), frames);
    }
    snd_pcm_close(handle);
    return 0;
}

然后使用命令编译为打击：

g++ pcm_min.cc -g -lasound -o alsa_test

执行 alsa_test：

$ export MALLOC_TRACE=/tmp/t
$ ./alsa_test
$ mtrace ./alsa_test $MALLOC_TRACE

然后它将显示如下内存泄漏信息：

    Memory not freed:
-----------------
           Address     Size     Caller
0x000000000075b450     0x10  at 0x7f8ff4f728e8
0x000000000075b470     0x20  at 0x7f8ff4f72904
0x000000000075b4a0     0x10  at 0x7f8ff5249373
0x000000000075b500     0x20  at 0x7f8ff5257961
0x000000000075b530     0x1a  at 0x7f8ff4c0248a
0x000000000075b560     0x48  at 0x7f8ff4f6c899
0x000000000075b6c0     0x25  at 0x7f8ff524cef4
0x000000000075b6f0      0x6  at 0x7f8ff4f6c9e5
0x000000000075b710     0x48  at 0x7f8ff4f6c899
0x000000000075b760      0x5  at 0x7f8ff4f6c9e5
0x000000000075b780     0x41  at 0x7f8ff524cef4
0x000000000075b7d0     0x28  at 0x7f8ff524cef4
0x000000000075b800     0x20  at 0x7f8ff466b627
.........

是谁的问题？追踪？阿尔萨斯？为什么？

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