I modified the code in amixer.c for my own use. Instead of being a command line utility that ends after every mixer access, I have it as a function call from a larger program. I also cut it down quite a bit so that I am only using sset for Master and PCM.
The problem that I am running into is that after each iteration of this code, I am losing 4k of memory. When I kill my program, all memory is returned to the system, so it points towards the alsa library as being the culprit.
I kept the basic initialization scheme of amixer intact in my program, which includes successive calls to snd_mixer_open, snd_mixer_attach, snd_mixer_selem_register, and snd_mixer_load. In debugging this problem, I found that the memory is lost after the call to snd_mixer_load. One would assume that snd_mixer_close would take care of all memory allocations, but it does not seem to clean it up properly. This leads me to believe that some unexpected allocation is being made in snd_mixer_load.
I traced it down into the library code, and I got to a point where I commented out the ioctl call in the function snd_ctl_hw_elem_list and this seemed to remedy the problem. To go one step back, I see that this function is being accessed in a while loop in the function snd_hctl_load. Within this loop is the function snd_ctl_elem_list_alloc_space, and I looked at its code to see if anything was out of whack, but it all seemed OK. At this point, I'm running out of ideas.....plus, I think I may have looked right at the problem piece of code but did not recognize it.
Has anyone come across this before? Am I doing something wrong, or is the library really leaking? Can anyone out there point me in the right direction? Any and all help on this would be greatly appreciated! I can't accept the fact that amixer can only be used as a command line interface to save that 4k per access!
----- Chris Pechie
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