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Code Issues Releases Wiki Activity

Add some helpful error messages

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This commit is contained in:
cbdev 2016-12-28 00:43:36 +01:00
parent 541958396b
commit 94d65aae92
1 changed files with 22 additions and 25 deletions
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47
driver-uinput/networktablet.c
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@ -42,35 +42,35 @@ void init_device(int fd){
// enable synchronization
if (ioctl(fd, UI_SET_EVBIT, EV_SYN) < 0)
die("error: ioctl UI_SET_EVBIT EV_SYN");
die("Failed to set event bit EV_SYN");
// enable 1 button
if (ioctl(fd, UI_SET_EVBIT, EV_KEY) < 0)
die("error: ioctl UI_SET_EVBIT EV_KEY");
die("Failed to set event bit EV_KEY");
if (ioctl(fd, UI_SET_KEYBIT, BTN_TOUCH) < 0)
die("error: ioctl UI_SET_KEYBIT");
die("Failed to set key bit BTN_TOUCH");
if (ioctl(fd, UI_SET_KEYBIT, BTN_TOOL_PEN) < 0)
die("error: ioctl UI_SET_KEYBIT");
die("Failed to set key bit BTN_TOOL_PEN");
if (ioctl(fd, UI_SET_KEYBIT, BTN_STYLUS) < 0)
die("error: ioctl UI_SET_KEYBIT");
die("Failed to set key bit BTN_STYLUS");
if (ioctl(fd, UI_SET_KEYBIT, BTN_STYLUS2) < 0)
die("error: ioctl UI_SET_KEYBIT");
die("Failed to set key bit BTN_STYLUS2");
// enable 2 main axes + pressure (absolute positioning)
if (ioctl(fd, UI_SET_EVBIT, EV_ABS) < 0)
die("error: ioctl UI_SET_EVBIT EV_ABS");
die("Failed to set event bit EV_ABS");
if (ioctl(fd, UI_SET_ABSBIT, ABS_X) < 0)
die("error: ioctl UI_SETEVBIT ABS_X");
die("Failed to set absolute bit ABS_X");
if (ioctl(fd, UI_SET_ABSBIT, ABS_Y) < 0)
die("error: ioctl UI_SETEVBIT ABS_Y");
die("Failed to set absolute bit ABS_Y");
if (ioctl(fd, UI_SET_ABSBIT, ABS_PRESSURE) < 0)
die("error: ioctl UI_SETEVBIT ABS_PRESSURE");
die("Failed to set absolute bit ABS_PRESSURE");
if (write(fd, &uidev, sizeof(uidev)) < 0)
die("error: write");
die("Failed to write device description");
if (ioctl(fd, UI_DEV_CREATE) < 0)
die("error: ioctl");
die("Failed to create new input device");
}
int prepare_socket(char* bindhost, char* port){
@ -88,7 +88,7 @@ int prepare_socket(char* bindhost, char* port){
status = getaddrinfo(bindhost, port, &hints, &info);
if(status){
fprintf(stderr, "Failed to get socket info for %s port %s: %s\n", bindhost, port, gai_strerror(status));
return -1;
die("Failed to create listening socket");
}
for(addr_it = info; addr_it != NULL; addr_it = addr_it->ai_next){
@ -118,10 +118,11 @@ int prepare_socket(char* bindhost, char* port){
freeaddrinfo(info);
if(!addr_it){
fprintf(stderr, "Failed to create listening socket for %s port %s\n", bindhost, port);
return -1;
if(!addr_it || fd < 0){
die("Failed to create listening socket");
}
printf("Now listening on %s port %s\n", bindhost, port);
return fd;
}
@ -132,7 +133,7 @@ void send_event(int device, int type, int code, int value){
.value = value
};
if (write(device, &ev, sizeof(ev)) < 0)
die("error: write()");
die("Failed to write event to device");
}
void handle_signal(int signal){
@ -142,22 +143,18 @@ void handle_signal(int signal){
int main(int argc, char** argv){
int device;
struct event_packet ev_pkt;
printf("GfxTablet driver (protocol version %u) starting\n", PROTOCOL_VERSION);
if ((device = open("/dev/uinput", O_WRONLY | O_NONBLOCK)) < 0)
die("error: open");
die("Failed to open input device node");
init_device(device);
udp_socket = prepare_socket(argc > 1 ? argv[1] : GFXTABLET_DEFAULT_HOST, argc > 2 ? argv[2] : GFXTABLET_DEFAULT_PORT);
printf("GfxTablet driver (protocol version %u) is ready and listening\n", PROTOCOL_VERSION);
signal(SIGINT, handle_signal);
signal(SIGTERM, handle_signal);
while (recv(udp_socket, &ev_pkt, sizeof(ev_pkt), 0) >= 9) { // every packet has at least 9 bytes
printf(".");
fflush(stdout);
if (memcmp(ev_pkt.signature, "GfxTablet", 9) != 0) {
fprintf(stderr, "\nIgnoring a malformed packet\n");
continue;
@ -172,7 +169,7 @@ int main(int argc, char** argv){
ev_pkt.x = ntohs(ev_pkt.x);
ev_pkt.y = ntohs(ev_pkt.y);
ev_pkt.pressure = ntohs(ev_pkt.pressure);
printf("x: %hu, y: %hu, pressure: %hu\n", ev_pkt.x, ev_pkt.y, ev_pkt.pressure);
printf("Event x: %hu, y: %hu, pressure: %hu\n", ev_pkt.x, ev_pkt.y, ev_pkt.pressure);
send_event(device, EV_ABS, ABS_X, ev_pkt.x);
send_event(device, EV_ABS, ABS_Y, ev_pkt.y);
@ -183,6 +180,7 @@ int main(int argc, char** argv){
send_event(device, EV_SYN, SYN_REPORT, 1);
break;
case EVENT_TYPE_BUTTON:
printf("Button %hhi event %hhu\n", ev_pkt.button, ev_pkt.down);
// stylus hovering
if (ev_pkt.button == -1)
send_event(device, EV_KEY, BTN_TOOL_PEN, ev_pkt.down);
@ -195,7 +193,6 @@ int main(int argc, char** argv){
// button 2
if (ev_pkt.button == 2)
send_event(device, EV_KEY, BTN_STYLUS2, ev_pkt.down);
printf("sent button: %hhi, %hhu\n", ev_pkt.button, ev_pkt.down);
send_event(device, EV_SYN, SYN_REPORT, 1);
break;
}