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socket: Fix get_available_bytes on systems other than Linux and Windows

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FIONREAD ioctl on Linux reports the size of payload on UDP sockets.
However, other systems usually add internal header size to the reported
size, which vary between different operating systems and socket types.
To make it work on more systems, we should follow what we do on Windows
instead of using this unreliable FIONREAD ioctl.

This fixes socket test on FreeBSD.
This commit is contained in:
Ting-Wei Lan 2018-05-26 11:56:25 +08:00
parent b4259dec70
commit 293c103a7d
1 changed files with 21 additions and 7 deletions
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28
gio/gsocket.c
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@ -2957,9 +2957,11 @@ g_socket_check_connect_result (GSocket *socket,
gssize
g_socket_get_available_bytes (GSocket *socket)
{
#ifdef G_OS_WIN32
#ifndef SO_NREAD
const gint bufsize = 64 * 1024;
static guchar *buf = NULL;
#endif
#ifdef G_OS_WIN32
u_long avail;
#else
gint avail;
@ -2967,25 +2969,37 @@ g_socket_get_available_bytes (GSocket *socket)
g_return_val_if_fail (G_IS_SOCKET (socket), -1);
#if defined (SO_NREAD)
#ifdef SO_NREAD
if (!g_socket_get_option (socket, SOL_SOCKET, SO_NREAD, &avail, NULL))
return -1;
#elif !defined (G_OS_WIN32)
if (ioctl (socket->priv->fd, FIONREAD, &avail) < 0)
avail = -1;
#else
if (socket->priv->type == G_SOCKET_TYPE_DATAGRAM)
{
if (G_UNLIKELY (g_once_init_enter (&buf)))
g_once_init_leave (&buf, g_malloc (bufsize));
/* On datagram sockets, FIONREAD ioctl is not reliable because many
* systems add internal header size to the reported size, making it
* unusable for this function. */
avail = recv (socket->priv->fd, buf, bufsize, MSG_PEEK);
if (avail == -1 && get_socket_errno () == WSAEWOULDBLOCK)
avail = 0;
if (avail == -1)
{
int errsv = get_socket_errno ();
#ifdef G_OS_WIN32
if (errsv == WSAEWOULDBLOCK)
#else
if (errsv == EWOULDBLOCK || errsv == EAGAIN)
#endif
avail = 0;
}
}
else
{
#ifdef G_OS_WIN32
if (ioctlsocket (socket->priv->fd, FIONREAD, &avail) < 0)
#else
if (ioctl (socket->priv->fd, FIONREAD, &avail) < 0)
#endif
avail = -1;
}
#endif