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2017-12-15io: introduce a network socket listener APIDaniel P. Berrange
The existing QIOChannelSocket class provides the ability to listen on a single socket at a time. This patch introduces a QIONetListener class that provides a higher level API concept around listening for network services, allowing for listening on multiple sockets. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-17Merge remote-tracking branch 'remotes/mjt/tags/trivial-patches-fetch' into ↵Peter Maydell
staging trivial patches for 2017-10-16 # gpg: Signature made Mon 16 Oct 2017 21:32:05 BST # gpg: using RSA key 0x701B4F6B1A693E59 # gpg: Good signature from "Michael Tokarev <mjt@tls.msk.ru>" # gpg: aka "Michael Tokarev <mjt@corpit.ru>" # gpg: aka "Michael Tokarev <mjt@debian.org>" # Primary key fingerprint: 6EE1 95D1 886E 8FFB 810D 4324 457C E0A0 8044 65C5 # Subkey fingerprint: 7B73 BAD6 8BE7 A2C2 8931 4B22 701B 4F6B 1A69 3E59 * remotes/mjt/tags/trivial-patches-fetch: Add myself as maintainer for TPM code filter-mirror: segfault when specifying non existent device MAINTAINERS: Track default-configs/pci.mak MAINTAINERS: Fix Sun4v file MAINTAINERS: Clean up SCSI device section include/hw/or-irq.h: Drop unused in_irqs field io: Add missing GCC_FMT_ATTR (fix -Werror=suggest-attribute=format) os-posix: Drop misleading comment linux-user: Add some random ioctls futex: add missing header guards ui/gtk: Fix deprecation of vte_terminal_copy_clipboard gitignore: ignore check-qlit test linux-user: remove duplicate break in syscall qemu-doc.texi: remove trailing whitespace Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-10-16io: Add missing GCC_FMT_ATTR (fix -Werror=suggest-attribute=format)Stefan Weil
This fixes a compiler warning: /qemu/io/channel-websock.c:163:5: error: function might be possible candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format] Signed-off-by: Stefan Weil <sw@weilnetz.de> Acked-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2017-10-16io: fix mem leak in websock error pathDaniel P. Berrange
Coverity pointed out the 'date' is not free()d in the error path Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16io: add trace points for websocket HTTP protocol headersDaniel P. Berrange
Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16io: cope with websock 'Connection' header having multiple valuesDaniel P. Berrange
The noVNC server sends a header "Connection: keep-alive, Upgrade" which fails our simple equality test. Split the header on ',', trim whitespace and then check for 'upgrade' token. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16io: get rid of bounce buffering in websock write pathDaniel P. Berrange
Currently most outbound I/O on the websock channel gets copied into the rawoutput buffer, and then immediately copied again into the encoutput buffer, with a header prepended. Now that qio_channel_websock_encode accepts a struct iovec, we can trivially remove this bounce buffering and write directly to encoutput. In doing so, we also now correctly validate the encoutput size against the QIO_CHANNEL_WEBSOCK_MAX_BUFFER limit. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16io: pass a struct iovec into qio_channel_websock_encodeDaniel P. Berrange
Instead of requiring use of another Buffer, pass a struct iovec into qio_channel_websock_encode, which gives callers more flexibility in how they process data. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16io: get rid of qio_channel_websock_encode helper methodDaniel P. Berrange
The qio_channel_websock_encode method is only used in one place, everything else calls qio_channel_websock_encode_buffer directly. It can also be pushed up a level into the qio_channel_websock_writev method, since every other caller of qio_channel_websock_write_wire has already filled encoutput. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16io: simplify websocket ping reply handlingDaniel P. Berrange
We must ensure we don't get flooded with ping replies if the outbound channel is slow. Currently we do this by keeping the ping reply in a separate temporary buffer and only writing it if the encoutput buffer is completely empty. This is overly pessimistic, as it is reasonable to add a ping reply to the encoutput buffer even if it has previous data in it, as long as that previous data doesn't include a ping reply. To track this better, put the ping reply directly into the encoutput buffer, and then record the size of encoutput at this time in pong_remain. As we write encoutput to the underlying channel, we can decrement the pong_remain counter. Once it hits zero, we can accept further ping replies for transmission. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16io: monitor encoutput buffer size from websocket GSourceDaniel P. Berrange
The websocket GSource is monitoring the size of the rawoutput buffer to determine if the channel can accepts more writes. The rawoutput buffer, however, is merely a temporary staging buffer before data is copied into the encoutput buffer. Thus its size will always be zero when the GSource runs. This flaw causes the encoutput buffer to grow without bound if the other end of the underlying data channel doesn't read data being sent. This can be seen with VNC if a client is on a slow WAN link and the guest OS is sending many screen updates. A malicious VNC client can act like it is on a slow link by playing a video in the guest and then reading data very slowly, causing QEMU host memory to expand arbitrarily. This issue is assigned CVE-2017-15268, publically reported in https://bugs.launchpad.net/qemu/+bug/1718964 Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: add trace events for websockets frame handlingDaniel P. Berrange
It is useful to trace websockets frame encoding/decoding when debugging problems. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: Attempt to send websocket close messages to clientBrandon Carpenter
Make a best effort attempt to close websocket connections according to the RFC. Sends the close message, as room permits in the socket buffer, and immediately closes the socket. Signed-off-by: Brandon Carpenter <brandon.carpenter@cypherpath.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: Reply to ping framesBrandon Carpenter
Add an immediate ping reply (pong) to the outgoing stream when a ping is received. Unsolicited pongs are ignored. Signed-off-by: Brandon Carpenter <brandon.carpenter@cypherpath.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: Ignore websocket PING and PONG framesBrandon Carpenter
Keep pings and gratuitous pongs generated by web browsers from killing websocket connections. Signed-off-by: Brandon Carpenter <brandon.carpenter@cypherpath.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: Allow empty websocket payloadBrandon Carpenter
Some browsers send pings/pongs with no payload, so allow empty payloads instead of closing the connection. Signed-off-by: Brandon Carpenter <brandon.carpenter@cypherpath.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: Add support for fragmented websocket binary framesBrandon Carpenter
Allows fragmented binary frames by saving the previous opcode. Handles the case where an intermediary (i.e., web proxy) fragments frames originally sent unfragmented by the client. Signed-off-by: Brandon Carpenter <brandon.carpenter@cypherpath.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: Small updates in preparation for websocket changesBrandon Carpenter
Gets rid of unnecessary bit shifting and performs proper EOF checking to avoid a large number of repeated calls to recvmsg() when a client abruptly terminates a connection (bug fix). Signed-off-by: Brandon Carpenter <brandon.carpenter@cypherpath.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: use case insensitive check for Connection & Upgrade websock headersDaniel P. Berrange
When checking the value of the Connection and Upgrade HTTP headers the websock RFC (6455) requires the comparison to be case insensitive. The Connection value should be an exact match not a substring. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: include full error message in websocket handshake traceDaniel P. Berrange
When the websocket handshake fails it is useful to log the real error message via the trace points for debugging purposes. Fixes bug: #1715186 Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-04io: send proper HTTP response for websocket errorsDaniel P. Berrange
When any error occurs while processing the websockets handshake, QEMU just terminates the connection abruptly. This is in violation of the HTTP specs and does not help the client understand what they did wrong. This is particularly bad when the client gives the wrong path, as a "404 Not Found" would be very helpful. Refactor the handshake code so that it always sends a response to the client unless there was an I/O error. Fixes bug: #1715186 Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-09-06io: Add new qio_channel_read{, v}_all_eof functionsEric Blake
Some callers want to distinguish between clean EOF (no bytes read) vs. a short read (at least one byte read, but EOF encountered before reaching the desired length), as it allows clients the ability to do a graceful shutdown when a server shuts down at defined safe points in the protocol, rather than treating all shutdown scenarios as an error due to EOF. However, we don't want to require all callers to have to check for early EOF. So add another wrapper function that can be used by the callers that care about the distinction. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20170905191114.5959-3-eblake@redhat.com> Acked-by: Daniel P. Berrange <berrange@redhat.com>
2017-09-06io: Yield rather than wait when already in coroutineEric Blake
The new qio_channel_{read,write}{,v}_all functions are documented as yielding until data is available. When used on a blocking channel, this yield is done via qio_channel_wait() which spawns a nested event loop under the hood (so it is that secondary loop which yields as needed); but if we are already in a coroutine (at which point QIO_CHANNEL_ERR_BLOCK is only possible if we are a non-blocking channel), we want to yield the current coroutine instead of spawning a nested event loop. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20170905191114.5959-2-eblake@redhat.com> Acked-by: Daniel P. Berrange <berrange@redhat.com> [commit message updated] Signed-off-by: Eric Blake <eblake@redhat.com>
2017-09-05io: add new qio_channel_{readv, writev, read, write}_all functionsDaniel P. Berrange
These functions wait until they are able to read / write the full requested data buffer(s). Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-09-05util: remove the obsolete non-blocking connectCao jin
The non-blocking connect mechanism is obsolete, and it doesn't work well in inet connection, because it will call getaddrinfo first and getaddrinfo will blocks on DNS lookups. Since commit e65c67e4 & d984464e, the non-blocking connect of migration goes through QIOChannel in a different manner(using a thread), and nobody use this old non-blocking connect anymore. Any newly written code which needs a non-blocking connect should use the QIOChannel code, so we can drop NonBlockingConnectHandler as a concept entirely. Suggested-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com> Signed-off-by: Mao Zhongyi <maozy.fnst@cn.fujitsu.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-08-02io: fix qio_channel_socket_accept err handlingPeter Xu
When accept failed, we should setup errp with the reason. More importantly, the caller may assume errp be non-NULL when error happens, and not setting the errp may crash QEMU. At the same time, move the trace_qio_channel_socket_accept_fail() after the if check on EINTR. Two reasons: 1. when EINTR happened, it's not really a fault (we should just try again), so we should not log with an "accept failure". 2. trace_*() functions may overwrite errno, then the old errno will be missing. We need to either check errno before trace_*() calls, or reserve the errno. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1501666880-10159-3-git-send-email-peterx@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2017-07-31docs: fix broken paths to docs/devel/tracing.txtPhilippe Mathieu-Daudé
With the move of some docs/ to docs/devel/ on ac06724a71, no references were updated. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2017-07-19Merge remote-tracking branch 'remotes/berrange/tags/pull-qio-2017-07-18-1' ↵Peter Maydell
into staging Merge I/O 2017/07/18 v1 # gpg: Signature made Tue 18 Jul 2017 11:31:53 BST # gpg: using RSA key 0xBE86EBB415104FDF # gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" # gpg: aka "Daniel P. Berrange <berrange@redhat.com>" # gpg: WARNING: This key is not certified with a trusted signature! # gpg: There is no indication that the signature belongs to the owner. # Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E 8E3F BE86 EBB4 1510 4FDF * remotes/berrange/tags/pull-qio-2017-07-18-1: io: simplify qio_channel_attach_aio_context Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-07-14io: preserve ipv4/ipv6 flags when resolving InetSocketAddressDaniel P. Berrange
The original InetSocketAddress struct may have has_ipv4 and has_ipv6 fields set, which will control both the ai_family used during DNS resolution, and later use of the V6ONLY flag. Currently the standalone DNS resolver code drops the has_ipv4 & has_ipv6 flags after resolving, which means the later bind() code won't correctly set V6ONLY. This fixes the following scenarios -vnc :0,ipv4=off -vnc :0,ipv6=on -vnc :::0,ipv4=off -vnc :::0,ipv6=on which all mistakenly accepted IPv4 clients Acked-by: Gerd Hoffmann <kraxel@gmail.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-13websock: Don't try to set *errp directlyEduardo Habkost
Assigning directly to *errp is not valid, as errp may be NULL, &error_fatal, or &error_abort. Use error_propagate() instead. Cc: "Daniel P. Berrange" <berrange@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <20170608133906.12737-4-ehabkost@redhat.com> Reviewed-by: Manos Pitsidianakis <el13635@mail.ntua.gr> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2017-05-26io: simplify qio_channel_attach_aio_contextPaolo Bonzini
If properly preceded by qio_channel_detach_aio_context, this function really has nothing to do except setting ioc->ctx. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-05-09sockets: Limit SocketAddressLegacy to external interfacesMarkus Armbruster
SocketAddressLegacy is a simple union, and simple unions are awkward: they have their variant members wrapped in a "data" object on the wire, and require additional indirections in C. SocketAddress is the equivalent flat union. Convert all users of SocketAddressLegacy to SocketAddress, except for existing external interfaces. See also commit fce5d53..9445673 and 85a82e8..c5f1ae3. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1493192202-3184-7-git-send-email-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> [Minor editing accident fixed, commit message and a comment tweaked] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2017-05-09sockets: Rename SocketAddress to SocketAddressLegacyMarkus Armbruster
The next commit will rename SocketAddressFlat to SocketAddress, and the commit after that will replace most uses of SocketAddressLegacy by SocketAddress, replacing most of this commit's renames right back. Note that checkpatch emits a few "line over 80 characters" warnings. The long lines are all temporary; the SocketAddressLegacy replacement will shorten them again. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1493192202-3184-5-git-send-email-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2017-04-24socket: Make errp the last parameter of socket_connectFam Zheng
Signed-off-by: Fam Zheng <famz@redhat.com> Message-Id: <20170421122710.15373-2-famz@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2017-04-04io: fix FD socket handling in DNS lookupDaniel P. Berrange
The qio_dns_resolver_lookup_sync() method is required to be a no-op for socket kinds that don't require name resolution. Thus the KIND_FD handling should not return an error. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-04-04io: fix incoming client socket initializationWang guang
The channel socket was initialized manually, but forgot to set QIO_CHANNEL_FEATURE_SHUTDOWN. Thus, the colo_process_incoming_thread would hang at recvmsg. This patch just call qio_channel_socket_new to get channel, Which set QIO_CHANNEL_FEATURE_SHUTDOWN already. Signed-off-by: Wang Guang<wang.guang55@zte.com.cn> Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-04-03io vnc sockets: Clean up SocketAddressKind switchesMarkus Armbruster
We have quite a few switches over SocketAddressKind. Some have case labels for all enumeration values, others rely on a default label. Some abort when the value isn't a valid SocketAddressKind, others report an error then. Unify as follows. Always provide case labels for all enumeration values, to clarify intent. Abort when the value isn't a valid SocketAddressKind, because the program state is messed up then. Improve a few error messages while there. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 1490895797-29094-4-git-send-email-armbru@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-02-28io: fully parse & validate HTTP headers for websocket protocol handshakeDaniel P. Berrange
The current websockets protocol handshake code is very relaxed, just doing crude string searching across the HTTP header data. This causes it to both reject valid connections and fail to reject invalid connections. For example, according to the RFC 6455 it: - MUST reject any method other than "GET" - MUST reject any HTTP version less than "HTTP/1.1" - MUST reject Connection header without "Upgrade" listed - MUST reject Upgrade header which is not 'websocket' - MUST reject missing Host header - MUST treat HTTP header names as case insensitive To do all this validation correctly requires that we fully parse the HTTP headers, populating a data structure containing the header fields. After this change, we also reject any path other than '/' Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-02-28io: fix decoding when multiple websockets frames arrive at onceDaniel P. Berrange
The qio_channel_websock_read_wire() method will read upto 4096 bytes off the socket and then decode the websockets header and payload. The code was only decoding a single websockets frame, even if the buffered data contained multiple frames. This meant that decoding of subsequent frames was delayed until further input arrived on the socket. This backlog of delayed frames gets worse & worse over time. Symptom was that when connecting to the VNC server via the built-in websockets server, mouse/keyboard interaction would start out fine, but slowly get more & more delayed until it was unusable. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-02-21io: make qio_channel_yield aware of AioContextsPaolo Bonzini
Support separate coroutines for reading and writing, and place the read/write handlers on the AioContext that the QIOChannel is registered with. Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20170213135235.12274-7-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-02-21io: add methods to set I/O handlers on AioContextPaolo Bonzini
This is in preparation for making qio_channel_yield work on AioContexts other than the main one. Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20170213135235.12274-6-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-01-26io: fix possible double free of task error objectDaniel P. Berrange
If a QIOTask has an error set and the calling code uses qio_task_propagate_error() to steal the reference to that Error object, the task would not clear its own reference. This would lead to a double-free when qio_task_free runs, if the caller had (correctly) freed the Error object they now owned. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-01-23io: introduce a DNS resolver APIDaniel P. Berrange
Currently DNS resolution is done automatically as part of the creation of a QIOChannelSocket object instance. This works ok for network clients where you just end up a single network socket, but for servers, the results of DNS resolution may require creation of multiple sockets. Introducing a DNS resolver API allows DNS resolution to be separated from the socket object creation. This will make it practical to create multiple QIOChannelSocket instances for servers. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-01-23io: remove Error parameter from QIOTask thread workerDaniel P. Berrange
Now that task objects have a directly associated error, there's no need for an an Error **errp parameter to the QIOTask thread worker function. It already has a QIOTask object, so can directly set the error on it. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-01-23io: change the QIOTask callback signatureDaniel P. Berrange
Currently the QIOTaskFunc signature takes an Object * for the source, and an Error * for any error. We also need to be able to provide a result pointer. Rather than continue to add parameters to QIOTaskFunc, remove the existing ones and simply pass the QIOTask object instead. This has methods to access all the other data items required in the callback impl. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-01-23io: add ability to associate an error with a taskDaniel P. Berrange
Currently when a task fails, the error is never explicitly associated with the task object, it is just passed along through the completion callback. This adds the ability to explicitly associate an error with the task. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-01-23io: add ability to associate an opaque "result" with with a taskDaniel P. Berrange
Currently there is no data associated with a successful task completion. This adds an opaque pointer to the task to store an arbitrary result. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-01-23io: stop incrementing reference in qio_task_get_sourceDaniel P. Berrange
Incrementing the reference in qio_task_get_source is not necessary, since we're not running concurrently with any other code touching the QIOTask. This minimizes chances of further memory leaks. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2016-10-27io: add ability to set a name for IO channelsDaniel P. Berrange
The GSource object has ability to have a name, which is useful when debugging performance problems with the mainloop event callbacks that take too long. By associating a name with a QIOChannel object, we can then set the name on any GSource associated with the channel. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2016-10-27io: set LISTEN flag explicitly for listen socketsDaniel P. Berrange
The SO_ACCEPTCONN ioctl is not portable across OS, with some BSD versions and OS-X not supporting it. There is no viable alternative to this, so instead just set the feature explicitly when creating a listener socket. The current users of qio_channel_socket_new_fd() won't ever be given a listening socket, so there's no problem with no auto-detecting it in this scenario Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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