osx man page for midi_msg_callback

midi_msg_callback(3alleg4)					  Allegro manual					midi_msg_callback(3alleg4)

NAME

       midi_msg_callback, midi_meta_callback, midi_sysex_callback - Hook functions allowing you to intercept MIDI player events. Allegro game pro-
       gramming library.

SYNOPSIS

       #include <allegro.h>

       extern void (*midi_msg_callback)(int msg, int byte1, int byte2);

       extern void (*midi_meta_callback)(int type, const unsigned char *data, int length);

       extern void (*midi_sysex_callback)(const unsigned char *data, int length);

DESCRIPTION

       Hook functions allowing you to intercept MIDI player events. If set to anything other than NULL, these routines will  be  called  for  each
       MIDI  message, meta-event, and system exclusive data block respectively. They will execute in an interrupt handler context, so all the code
       and data they use should be locked, and they must not call any operating system functions. In general you just use these  routines  to  set
       some flags and respond to them later in your mainline code.

SEE ALSO

       play_midi(3alleg4)

Allegro 							   version 4.4.2					midi_msg_callback(3alleg4)