Get information about the channels owned by the specified process.

Call this the first time with an argument of NULL to get the number of channels:

devctl(fd, DCMD_PROC_CHANNELS, NULL, 0, &n);

Next, allocate a buffer that's large enough to hold a procfs_channel structure (see debug_channel_t in <sys/debug.h>) for each channel, and pass it to another devctl() call:

my_buffer = (procfs_channel *)
               malloc( sizeof(procfs_channel) * n );
if ( my_buffer == NULL ) {
  /* Not enough memory. */

devctl( fd, DCMD_PROC_CHANNELS, my_buffer,
        sizeof(procfs_channel) * n, &dummy);