Why i cann't set record source and how to use LINEIN

grep_one

Now i need to playback an audio file and record it synchronously with MIC or LINELN.I don't know how to use LINELN to record and a error message turns up as set the record source.please help me!!!
The configuration of my system is :RH9.0,oss driver with ITEL ICH6 card.
Source code for setting record source as below:

int mfd = open("/dev/mixer",O_RDONLY);
if(mfd == -1){
printf("Open device fail.\n";
return 1;
}
int recmask = SOUND_MIXER_MIC;
int status = ioctl(mfd,SOUND_MIXER_WRITE_RECSRC,&recmask);
if(status==-1){
perror("SOUND_MIXER_WRITE_RECSRC fail\n";
return 1;
}

The error message is:"SOUND_MIXER_WRITE_RECSRC fail:invalid argument"


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grep_one

请大侠们帮忙提供思路