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authorMax Kellermann <max@duempel.org>2009-01-25 19:54:57 +0100
committerMax Kellermann <max@duempel.org>2009-01-25 19:54:57 +0100
commit8bc6bca555e95a2bab6aeeee51e70ca49e71864f (patch)
tree3fc8d6db5690c1c9b9a62ab5060764071dd94109 /src/client.c
parentb0ea975642c55fe163857ea61b4ca5a0e4416a02 (diff)
downloadmpd-8bc6bca555e95a2bab6aeeee51e70ca49e71864f.tar.gz
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client: use the GIOChannel for I/O
GIOChannel is more portable than raw read()/write() calls. We're using GIOChannel anyway, because we need it for plugging the client into the GLib main loop. Configure the GIOChannel to the bare minimum: no character set, no buffering.
Diffstat (limited to '')
-rw-r--r--src/client.c150
1 files changed, 110 insertions, 40 deletions
diff --git a/src/client.c b/src/client.c
index 18fc131d2..ceb915d58 100644
--- a/src/client.c
+++ b/src/client.c
@@ -73,7 +73,6 @@ struct client {
size_t bufferLength;
size_t bufferPos;
- int fd; /* file descriptor; -1 if expired */
GIOChannel *channel;
guint source_id;
@@ -114,7 +113,7 @@ static void client_write_output(struct client *client);
bool client_is_expired(const struct client *client)
{
- return client->fd < 0;
+ return client->channel == NULL;
}
int client_get_uid(const struct client *client)
@@ -148,7 +147,7 @@ client_manager_expire_event(G_GNUC_UNUSED gpointer data)
static inline void client_set_expired(struct client *client)
{
- if (expire_source_id == 0 && client->fd >= 0)
+ if (expire_source_id == 0 && !client_is_expired(client))
/* delayed deletion */
expire_source_id = g_idle_add(client_manager_expire_event,
NULL);
@@ -162,11 +161,6 @@ static inline void client_set_expired(struct client *client)
g_io_channel_unref(client->channel);
client->channel = NULL;
}
-
- if (client->fd >= 0) {
- close(client->fd);
- client->fd = -1;
- }
}
static gboolean
@@ -182,13 +176,20 @@ static void client_init(struct client *client, int fd)
client->cmd_list_OK = -1;
client->bufferLength = 0;
client->bufferPos = 0;
- client->fd = fd;
#ifndef G_OS_WIN32
- client->channel = g_io_channel_unix_new(client->fd);
+ client->channel = g_io_channel_unix_new(fd);
#else
- client->channel = g_io_channel_win32_new_socket(client->fd);
+ client->channel = g_io_channel_win32_new_socket(fd);
#endif
+ /* GLib is responsible for closing the file descriptor */
+ g_io_channel_set_close_on_unref(client->channel, true);
+ /* NULL encoding means the stream is binary safe; the MPD
+ protocol is UTF-8 only, but we are doing this call anyway
+ to prevent GLib from messing around with the stream */
+ g_io_channel_set_encoding(client->channel, NULL, NULL);
+ /* we prefer to do buffering */
+ g_io_channel_set_buffered(client->channel, false);
client->source_id = g_io_add_watch(client->channel, G_IO_IN,
client_in_event, client);
@@ -460,23 +461,40 @@ static int client_input_received(struct client *client, size_t bytesRead)
static int client_read(struct client *client)
{
- ssize_t bytesRead;
+ GError *error = NULL;
+ GIOStatus status;
+ gsize bytes_read;
assert(client->bufferPos <= client->bufferLength);
assert(client->bufferLength < sizeof(client->buffer));
- bytesRead = read(client->fd,
- client->buffer + client->bufferLength,
- sizeof(client->buffer) - client->bufferLength);
+ status = g_io_channel_read_chars
+ (client->channel,
+ client->buffer + client->bufferLength,
+ sizeof(client->buffer) - client->bufferLength,
+ &bytes_read, &error);
+ switch (status) {
+ case G_IO_STATUS_NORMAL:
+ return client_input_received(client, bytes_read);
- if (bytesRead > 0)
- return client_input_received(client, bytesRead);
- else if (bytesRead < 0 && errno == EINTR)
+ case G_IO_STATUS_AGAIN:
/* try again later, after select() */
return 0;
- else
- /* peer disconnected or I/O error */
+
+ case G_IO_STATUS_EOF:
+ /* peer disconnected */
+ return COMMAND_RETURN_CLOSE;
+
+ case G_IO_STATUS_ERROR:
+ /* I/O error */
+ g_warning("failed to read from client %d: %s",
+ client->num, error->message);
+ g_error_free(error);
return COMMAND_RETURN_CLOSE;
+ }
+
+ /* unreachable */
+ return COMMAND_RETURN_CLOSE;
}
static gboolean
@@ -616,9 +634,47 @@ client_manager_expire(void)
g_list_foreach(clients, client_check_expired_callback, NULL);
}
+static size_t
+client_write_deferred_buffer(struct client *client,
+ const struct deferred_buffer *buffer)
+{
+ GError *error = NULL;
+ GIOStatus status;
+ gsize bytes_written;
+
+ status = g_io_channel_write_chars
+ (client->channel, buffer->data, buffer->size,
+ &bytes_written, &error);
+ switch (status) {
+ case G_IO_STATUS_NORMAL:
+ return bytes_written;
+
+ case G_IO_STATUS_AGAIN:
+ return 0;
+
+ case G_IO_STATUS_EOF:
+ /* client has disconnected */
+
+ client_set_expired(client);
+ return 0;
+
+ case G_IO_STATUS_ERROR:
+ /* I/O error */
+
+ client_set_expired(client);
+ g_warning("failed to flush buffer for %i: %s",
+ client->num, error->message);
+ g_error_free(error);
+ return 0;
+ }
+
+ /* unreachable */
+ return 0;
+}
+
static void client_write_deferred(struct client *client)
{
- ssize_t ret = 0;
+ size_t ret;
while (!g_queue_is_empty(client->deferred_send)) {
struct deferred_buffer *buf =
@@ -627,10 +683,11 @@ static void client_write_deferred(struct client *client)
assert(buf->size > 0);
assert(buf->size <= client->deferred_bytes);
- ret = write(client->fd, buf->data, buf->size);
- if (ret < 0)
+ ret = client_write_deferred_buffer(client, buf);
+ if (ret == 0)
break;
- else if ((size_t)ret < buf->size) {
+
+ if (ret < buf->size) {
assert(client->deferred_bytes >= (size_t)ret);
client->deferred_bytes -= ret;
buf->size -= ret;
@@ -645,6 +702,7 @@ static void client_write_deferred(struct client *client)
g_free(buf);
g_queue_pop_head(client->deferred_send);
}
+
client->lastTime = time(NULL);
}
@@ -652,11 +710,6 @@ static void client_write_deferred(struct client *client)
g_debug("client %i: buffer empty %lu", client->num,
(unsigned long)client->deferred_bytes);
assert(client->deferred_bytes == 0);
- } else if (ret < 0 && errno != EAGAIN && errno != EINTR) {
- /* cause client to close */
- g_debug("client %i: problems flushing buffer",
- client->num);
- client_set_expired(client);
}
}
@@ -691,23 +744,40 @@ static void client_defer_output(struct client *client,
static void client_write_direct(struct client *client,
const char *data, size_t length)
{
- ssize_t ret;
+ GError *error = NULL;
+ GIOStatus status;
+ gsize bytes_written;
assert(length > 0);
assert(g_queue_is_empty(client->deferred_send));
- if ((ret = write(client->fd, data, length)) < 0) {
- if (errno == EAGAIN || errno == EINTR) {
- client_defer_output(client, data, length);
- } else {
- g_debug("client %i: problems writing", client->num);
- client_set_expired(client);
- return;
- }
- } else if ((size_t)ret < client->send_buf_used) {
- client_defer_output(client, data + ret, length - ret);
+ status = g_io_channel_write_chars(client->channel, data, length,
+ &bytes_written, &error);
+ switch (status) {
+ case G_IO_STATUS_NORMAL:
+ case G_IO_STATUS_AGAIN:
+ break;
+
+ case G_IO_STATUS_EOF:
+ /* client has disconnected */
+
+ client_set_expired(client);
+ return;
+
+ case G_IO_STATUS_ERROR:
+ /* I/O error */
+
+ client_set_expired(client);
+ g_warning("failed to write to %i: %s",
+ client->num, error->message);
+ g_error_free(error);
+ return;
}
+ if (bytes_written < length)
+ client_defer_output(client, data + bytes_written,
+ length - bytes_written);
+
if (!g_queue_is_empty(client->deferred_send))
g_debug("client %i: buffer created", client->num);
}