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char: translate from QIOChannel error to errno

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Caller of CharDriverState.chr* callback assume errno error conventions.
Translate QIOChannel error to errno (this fixes potential EAGAIN
regression, for ex if a vhost-user backend block, qemu_chr_fe_read_all()
could get error -2 and not wait)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1457718924-19338-1-git-send-email-marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2016-03-11 18:55:24 +01:00 committed by Paolo Bonzini
parent 5c3ece79cd
commit b6572b4f97
1 changed files with 7 additions and 0 deletions
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7
qemu-char.c
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@ -2799,6 +2799,13 @@ static ssize_t tcp_chr_recv(CharDriverState *chr, char *buf, size_t len)
NULL);
}
if (ret == QIO_CHANNEL_ERR_BLOCK) {
errno = EAGAIN;
ret = -1;
} else if (ret == -1) {
errno = EIO;
}
if (msgfds_num) {
/* close and clean read_msgfds */
for (i = 0; i < s->read_msgfds_num; i++) {