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chardev: fix handling of EAGAIN for TCP chardev 

When this commit was applied

  commit 9894dc0cdc
  Author: Daniel P. Berrange <berrange@redhat.com>
  Date:   Tue Jan 19 11:14:29 2016 +0000

    char: convert from GIOChannel to QIOChannel

The tcp_chr_recv() function was changed to return QIO_CHANNEL_ERR_BLOCK
which corresonds to -2. As such the handling for EAGAIN was able to be
removed from tcp_chr_read(). Unfortunately in a later commit:

  commit b6572b4f97
  Author: Marc-André Lureau <marcandre.lureau@redhat.com>
  Date:   Fri Mar 11 18:55:24 2016 +0100

    char: translate from QIOChannel error to errno

The tcp_chr_recv() function was changed back to return -1, with errno
set to EAGAIN, without also re-addding support for this to tcp_chr_read()

Reported-by: Aleksey Kuleshov <rndfax@yandex.ru>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20180222121351.26191-1-berrange@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2018-02-22 12:13:51 +00:00 committed by Paolo Bonzini
parent c8ca2a23a9
commit c863fdec6a
1 changed files with 1 additions and 1 deletions
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2
chardev/char-socket.c
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@ -450,7 +450,7 @@ static gboolean tcp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
len = s->max_size;
}
size = tcp_chr_recv(chr, (void *)buf, len);
if (size == 0 || size == -1) {
if (size == 0 || (size == -1 && errno != EAGAIN)) {
/* connection closed */
tcp_chr_disconnect(chr);
} else if (size > 0) {