Struct gio::Socket

source ·
#[repr(transparent)]
pub struct Socket { /* private fields */ }
Expand description

A Socket is a low-level networking primitive. It is a more or less direct mapping of the BSD socket API in a portable GObject based API. It supports both the UNIX socket implementations and winsock2 on Windows.

Socket is the platform independent base upon which the higher level network primitives are based. Applications are not typically meant to use it directly, but rather through classes like SocketClient, SocketService and SocketConnection. However there may be cases where direct use of Socket is useful.

Socket implements the Initable interface, so if it is manually constructed by e.g. glib::Object::new() you must call InitableExt::init() and check the results before using the object. This is done automatically in new() and from_fd(), so these functions can return None.

Sockets operate in two general modes, blocking or non-blocking. When in blocking mode all operations (which don’t take an explicit blocking parameter) block until the requested operation is finished or there is an error. In non-blocking mode all calls that would block return immediately with a IOErrorEnum::WouldBlock error. To know when a call would successfully run you can call SocketExt::condition_check(), or SocketExt::condition_wait(). You can also use g_socket_create_source() and attach it to a glib::MainContext to get callbacks when I/O is possible. Note that all sockets are always set to non blocking mode in the system, and blocking mode is emulated in GSocket.

When working in non-blocking mode applications should always be able to handle getting a IOErrorEnum::WouldBlock error even when some other function said that I/O was possible. This can easily happen in case of a race condition in the application, but it can also happen for other reasons. For instance, on Windows a socket is always seen as writable until a write returns IOErrorEnum::WouldBlock.

GSockets can be either connection oriented or datagram based. For connection oriented types you must first establish a connection by either connecting to an address or accepting a connection from another address. For connectionless socket types the target/source address is specified or received in each I/O operation.

All socket file descriptors are set to be close-on-exec.

Note that creating a Socket causes the signal SIGPIPE to be ignored for the remainder of the program. If you are writing a command-line utility that uses Socket, you may need to take into account the fact that your program will not automatically be killed if it tries to write to stdout after it has been closed.

Like most other APIs in GLib, Socket is not inherently thread safe. To use a Socket concurrently from multiple threads, you must implement your own locking.

Implements

SocketExt, glib::ObjectExt, InitableExt, SocketExtManual

Implementations§

Creates a new Socket from a native file descriptor or winsock SOCKET handle.

This reads all the settings from the file descriptor so that all properties should work. Note that the file descriptor will be set to non-blocking mode, independent on the blocking mode of the Socket.

On success, the returned Socket takes ownership of fd. On failure, the caller must close fd themselves.

Since GLib 2.46, it is no longer a fatal error to call this on a non-socket descriptor. Instead, a GError will be set with code IOErrorEnum::Failed

fd

a native socket file descriptor.

Returns

a Socket or None on error. Free the returned object with g_object_unref().

Creates a new Socket with the defined family, type and protocol. If protocol is 0 (SocketProtocol::Default) the default protocol type for the family and type is used.

The protocol is a family and type specific int that specifies what kind of protocol to use. SocketProtocol lists several common ones. Many families only support one protocol, and use 0 for this, others support several and using 0 means to use the default protocol for the family and type.

The protocol id is passed directly to the operating system, so you can use protocols not listed in SocketProtocol if you know the protocol number used for it.

family

the socket family to use, e.g. SocketFamily::Ipv4.

type_

the socket type to use.

protocol

the id of the protocol to use, or 0 for default.

Returns

a Socket or None on error. Free the returned object with g_object_unref().

Trait Implementations§

Extracts the raw file descriptor. Read more
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This method tests less than (for self and other) and is used by the < operator. Read more
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This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
Returns the type identifier of Self.

Auto Trait Implementations§

Blanket Implementations§

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Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
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Same as Self::emit but takes Value for the arguments.
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