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| author | Roman Kagan <rvkagan@yandex-team.ru> | 2021-11-11 18:33:47 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-01-07 05:19:55 -0500 |
| commit | 666265036fec3fd3eed2d55ae828c915a084a1d6 (patch) | |
| tree | 88857b1e14dd5002a5def6dcbe67c129f3b0047c /chardev/char-socket.c | |
| parent | e87975051ee6071dec12d318e45a28d4770c2dd0 (diff) | |
| download | focaccia-qemu-666265036fec3fd3eed2d55ae828c915a084a1d6.tar.gz focaccia-qemu-666265036fec3fd3eed2d55ae828c915a084a1d6.zip | |
chardev/char-socket: tcp_chr_sync_read: don't clobber errno
After the return from tcp_chr_recv, tcp_chr_sync_read calls into a function which eventually makes a system call and may clobber errno. Make a copy of errno right after tcp_chr_recv and restore the errno on return from tcp_chr_sync_read. Signed-off-by: Roman Kagan <rvkagan@yandex-team.ru> Message-Id: <20211111153354.18807-4-rvkagan@yandex-team.ru> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Diffstat (limited to 'chardev/char-socket.c')
| -rw-r--r-- | chardev/char-socket.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/chardev/char-socket.c b/chardev/char-socket.c index 3ddd98ed49..fab2d791d4 100644 --- a/chardev/char-socket.c +++ b/chardev/char-socket.c @@ -525,6 +525,7 @@ static int tcp_chr_sync_read(Chardev *chr, const uint8_t *buf, int len) { SocketChardev *s = SOCKET_CHARDEV(chr); int size; + int saved_errno; if (s->state != TCP_CHARDEV_STATE_CONNECTED) { return 0; @@ -532,6 +533,7 @@ static int tcp_chr_sync_read(Chardev *chr, const uint8_t *buf, int len) qio_channel_set_blocking(s->ioc, true, NULL); size = tcp_chr_recv(chr, (void *) buf, len); + saved_errno = errno; if (s->state != TCP_CHARDEV_STATE_DISCONNECTED) { qio_channel_set_blocking(s->ioc, false, NULL); } @@ -540,6 +542,7 @@ static int tcp_chr_sync_read(Chardev *chr, const uint8_t *buf, int len) tcp_chr_disconnect(chr); } + errno = saved_errno; return size; } |