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device: Work around FreeBSD kernel bug for querying gamepad axes

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This is to support older kernels, which always returned 0 from successful ioctl, rather than the number of bits.  This was fixed in the FreeBSD kernel trunk.
This commit is contained in:
rdb 2021-04-05 17:19:47 +02:00
parent 7be4b7c3bb
commit 51a6923008
1 changed files with 16 additions and 1 deletions
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17
panda/src/device/evdevInputDevice.cxx
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@ -328,7 +328,22 @@ init_device() {
uint8_t axes[(ABS_MAX + 8) >> 3] = {0}; uint8_t axes[(ABS_MAX + 8) >> 3] = {0};
if (test_bit(EV_ABS, evtypes)) { if (test_bit(EV_ABS, evtypes)) {
// Check which axes are on the device. // Check which axes are on the device.
num_bits = ioctl(_fd, EVIOCGBIT(EV_ABS, sizeof(axes)), axes) << 3; int result = ioctl(_fd, EVIOCGBIT(EV_ABS, sizeof(axes)), axes);
#ifdef __FreeBSD__
// Older kernels had a bug where this would always return 0, see D28218
if (result == 0) {
for (int i = ABS_MAX; i >= 0; --i) {
if (test_bit(i, axes)) {
num_bits = i + 1;
break;
}
}
}
else
#endif
if (result > 0) {
num_bits = result << 3;
}
has_axes = true; has_axes = true;
} }