afCloseFile man page
afCloseFile — close an open audio file
int afCloseFile(AFfilehandle file);
file is a valid file handle created by afOpenFile(3).
afCloseFile closes the audio file file, updating the file if it was opened for writing.
afCloseFile returns 0 if the file was closed properly and -1 if an error occurred while closing the file.
afCloseFile can generate these possible errors:
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