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Retry hid_send_feature_report() if the ioctl() fails with EPIPE (e.g. the device stalled)

This commit is contained in:
Sam Lantinga 2021-11-11 14:35:51 -08:00
parent a3648e26df
commit 911d91c55c
1 changed files with 12 additions and 4 deletions
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12
src/hidapi/linux/hid.c
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@ -826,15 +826,23 @@ int HID_API_EXPORT hid_set_nonblocking(hid_device *dev, int nonblock)
return 0; /* Success */ return 0; /* Success */
} }
int HID_API_EXPORT hid_send_feature_report(hid_device *dev, const unsigned char *data, size_t length) int HID_API_EXPORT hid_send_feature_report(hid_device *dev, const unsigned char *data, size_t length)
{ {
static const int MAX_RETRIES = 50;
int retry;
int res; int res;
for (retry = 0; retry < MAX_RETRIES; ++retry) {
res = ioctl(dev->device_handle, HIDIOCSFEATURE(length), data); res = ioctl(dev->device_handle, HIDIOCSFEATURE(length), data);
if (res < 0 && errno == EPIPE) {
/* Try again... */
continue;
}
if (res < 0) if (res < 0)
perror("ioctl (SFEATURE)"); perror("ioctl (SFEATURE)");
break;
}
return res; return res;
} }