[DAHLIN-6] Frame relay broken

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From DB email on 10/2/2023:

So if you set in /etc/dahdi/system.conf:

    nethdlc=X       << Where X is 1 or more channels you want in HDLC mode

Then on running dahdi_cfg:

    DAHDI_CHANCONFIG failed on channel 72: Function not implemented (38)

Because of in:

include/dahdi/config.h you have:

    dahdi_config.h: * Uncomment CONFIG_DAHDI_NET to enable SyncPPP, CiscoHDLC, and Frame Relay
    dahdi_config.h://#define CONFIG_DAHDI_NET

If we uncomment that, then on make we get:

/usr/src/dahdi-linux-3.2.0/drivers/dahdi/dahdi-base.c: In function ‘dahdi_net_ioctl’:
/usr/src/dahdi-linux-3.2.0/drivers/dahdi/dahdi-base.c:2164:32: error: passing argument 2 of ‘hdlc_ioctl’ from incompatible pointer type [-Werror=incompatible-pointer-types]
 2164 |         return hdlc_ioctl(dev, ifr); // , cmd);
      |                                ^~~
      |                                |
      |                                struct ifreq *

I seem to recall that was just the start of the problems. This is DAHDI-Linux 3.2.0, on 5.15.0, this changed somewhere between Kernel 3.17 and 5.15+ to be if_settings. I recall starting to fix this in the past, and it becoming a monster undertaking.

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