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ltunify: introduce read timeouts

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In case a message does not get a response (user pulled out the receiver,
thunder hit the device, coke has fallen on a keyboard, etc.), do not wait
`for(;;)`. (2 seconds because accessing registers may be slow)
This commit is contained in:
Peter Wu
2013-04-29 19:05:28 +02:00
parent 0c6200cd5f
commit e9bb1ae6ff
1 changed files with 23 additions and 6 deletions
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29
ltunify.c
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@@ -29,6 +29,7 @@
#include <arpa/inet.h> /* ntohs, ntohl */
#include <glob.h> /* for /dev/hidrawX discovery */
#include <getopt.h> /* for getopt_long */
#include <poll.h>
#ifndef PACKAGE_VERSION
# define PACKAGE_VERSION "0.1"
@@ -295,7 +296,7 @@ static void dump_msg(struct hidpp_message *msg, size_t payload_size, const char
fflush(NULL);
}
static ssize_t do_io(int fd, struct hidpp_message *msg, bool is_write) {
static ssize_t do_io(int fd, struct hidpp_message *msg, bool is_write, int timeout) {
ssize_t r;
size_t payload_size = SHORT_MESSAGE_LEN;
@@ -307,6 +308,19 @@ static ssize_t do_io(int fd, struct hidpp_message *msg, bool is_write) {
dump_msg(msg, payload_size, "wr");
r = write(fd, msg, payload_size);
} else {
struct pollfd pollfd;
pollfd.fd = fd;
pollfd.events = POLLIN;
r = poll(&pollfd, 1, timeout);
if (r < 0) {
perror("poll");
return 0;
} else if (r == 0) {
// timeout
return 0;
}
r = read(fd, msg, payload_size);
if (r >= 0) {
int saved_errno = errno;
@@ -324,11 +338,11 @@ static ssize_t do_io(int fd, struct hidpp_message *msg, bool is_write) {
}
return 0;
}
static ssize_t do_read(int fd, struct hidpp_message *msg) {
return do_io(fd, msg, false);
static ssize_t do_read(int fd, struct hidpp_message *msg, int timeout) {
return do_io(fd, msg, false, timeout);
}
static ssize_t do_write(int fd, struct hidpp_message *msg) {
return do_io(fd, msg, true);
return do_io(fd, msg, true, 0);
}
const char *get_report_id_str(u8 report_type) {
@@ -384,7 +398,7 @@ static bool do_read_skippy(int fd, struct hidpp_message *msg,
u8 exp_report_id, u8 exp_sub_id) {
for (;;) {
msg->report_id = exp_report_id;
if (!do_read(fd, msg)) {
if (!do_read(fd, msg, 2000)) {
return false;
}
if (msg->report_id == exp_report_id && msg->sub_id == exp_sub_id) {
@@ -602,6 +616,9 @@ bool device_unpair(int fd, u8 device_index) {
void perform_pair(int fd, u8 timeout) {
struct hidpp_message msg;
if (timeout == 0) {
timeout = 30;
}
if (!pair_start(fd, timeout)) {
fprintf(stderr, "Failed to send pair request\n");
return;
@@ -610,7 +627,7 @@ void perform_pair(int fd, u8 timeout) {
// WARNING: mess ahead. I knew it would become messy before writing it.
for (;;) {
msg.report_id = SHORT_MESSAGE;
if (!do_read(fd, &msg)) {
if (!do_read(fd, &msg, timeout * 1000 + 2000)) {
fprintf(stderr, "Failed to read short message\n");
break;
}