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char: io_channel_send: don't lose written bytes 

The g_io_channel_write_chars() documentation states,

  bytes_written: The number of bytes written. This can be nonzero even if
                 the return value is not G_IO_STATUS_NORMAL. [...]

io_channel_send() could lose such bytes before.

Furthermore, the (status == G_IO_STATUS_EOF) condition used to evaluate to
constant false whenever it was reached. When that condition actually held,
it always led to -1 / EINVAL. This patch (almost) distinguishes
G_IO_STATUS_EOF only when no bytes have been written, and then treats it
as an error.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Message-id: 1373998781-29561-2-git-send-email-lersek@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Laszlo Ersek 2013-07-16 20:19:40 +02:00 committed by Anthony Liguori
parent 0d185e6388
commit ac8c26f633
1 changed files with 19 additions and 22 deletions
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41
qemu-char.c
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@ -720,35 +720,32 @@ static GIOChannel *io_channel_from_socket(int fd)
static int io_channel_send(GIOChannel *fd, const void *buf, size_t len) static int io_channel_send(GIOChannel *fd, const void *buf, size_t len)
{ {
GIOStatus status; size_t offset = 0;
size_t offset; GIOStatus status = G_IO_STATUS_NORMAL;
offset = 0; while (offset < len && status == G_IO_STATUS_NORMAL) {
while (offset < len) { gsize bytes_written = 0;
gsize bytes_written;
status = g_io_channel_write_chars(fd, buf + offset, len - offset, status = g_io_channel_write_chars(fd, buf + offset, len - offset,
&bytes_written, NULL); &bytes_written, NULL);
if (status != G_IO_STATUS_NORMAL) {
if (status == G_IO_STATUS_AGAIN) {
/* If we've written any data, return a partial write. */
if (offset) {
break;
}
errno = EAGAIN;
} else {
errno = EINVAL;
}
return -1;
} else if (status == G_IO_STATUS_EOF) {
break;
}
offset += bytes_written; offset += bytes_written;
} }
return offset; if (offset > 0) {
return offset;
}
switch (status) {
case G_IO_STATUS_NORMAL:
g_assert(len == 0);
return 0;
case G_IO_STATUS_AGAIN:
errno = EAGAIN;
return -1;
default:
break;
}
errno = EINVAL;
return -1;
} }
#ifndef _WIN32 #ifndef _WIN32