What is the return value of socket?

What is the return value of socket?

RETURN VALUE Upon successful completion, socket() shall return a non-negative integer, the socket file descriptor. Otherwise, a value of -1 shall be returned and errno set to indicate the error.

What does the function send () return?

RETURN VALUE Upon successful completion, send() shall return the number of bytes sent. Otherwise, -1 shall be returned and errno set to indicate the error.

What will the return value be from Send when an error occurs?

If no error occurs, send returns the total number of bytes sent, which can be less than the number requested to be sent in the len parameter. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

What is send function in socket programming?

The send() function sends data on the socket with descriptor socket. The send() call applies to all connected sockets. Parameter Description socket. The socket descriptor. msg.

What is the value of socket?

The return value of socket() depends on whether you are using Windows or a different platform. On Windows/Winsock, socket() returns an unsigned int . The return value will be INVALID_SOCKET if the call to socket() failed. On Linux and macOS, socket() returns an int .

How do you print a return value in Python?

To print a value in Python, you call the print() function. Returning is used to return a value from a function and exit the function. To return a value from a function, use the return keyword.

Is socket send atomic?

No, it’s possible that parts of your data gets passed over the wire, and another part only goes as far as being copied into the internal buffers of the local TCP stack. send() will return the no. of bytes passed to the local TCP stack, not the no.

What does RECV return in C?

RETURN VALUE Upon successful completion, recv() shall return the length of the message in bytes. If no messages are available to be received and the peer has performed an orderly shutdown, recv() shall return 0. Otherwise, -1 shall be returned and errno set to indicate the error.

How do you send data through a socket?

Overview:

  1. The send()method of Python’s socket class is used to send data from one socket to another socket.
  2. The send()method can only be used with a connected socket.
  3. The send() method can be used to send data from a TCP based client socket to a TCP based client-connected socket at the server side and vice versa.

What does the socket () function return in case of error in socket creation?

The return value is the descriptor of the new socket that is created for the new connection or −1 if there is an error. sockfd is the descriptor of the socket that has a pending connection.

How do you use a returned value?

To return a value from a function, you must include a return statement, followed by the value to be returned, before the function’s end statement. If you do not include a return statement or if you do not specify a value after the keyword return, the value returned by the function is unpredictable.

How do I print returned value?

Print vs Return in Python

  1. Printing means displaying a value in the console. To print a value in Python, you call the print() function.
  2. Returning is used to return a value from a function and exit the function. To return a value from a function, use the return keyword.

Is socket send thread-safe?

So even though send() is thread-safe, synchronisation is required to ensure that the bytes from different send calls are merged into the byte stream in a predictable manner.

On Windows/Winsock, socket () returns an unsigned int. The return value will be INVALID_SOCKET if the call to socket () failed. On Linux and macOS, socket () returns an int. The return value will be negative if the call to socket () failed.

What is the return value of SEND function?

In such cases, sendwill return zero as a valid value. For message-oriented sockets, a zero-length transport datagram is sent. The flagsparameter can be used to influence the behavior of the function beyond the options specified for the associated socket.

How does the socket send function work in non-blocking mode?

In non-blocking mode, it sends whatever will fit into the socket send buffer and returns that length if > 0. If the socket send buffer is full, it returns -1 with errno = EWOULDBLOCK/EAGAIN.

How to check if a socket send buffer is full?

In non-blocking mode, it sends whatever will fit into the socket send buffer and returns that length if > 0. If the socket send buffer is full, it returns -1 with errno = EWOULDBLOCK/EAGAIN. Thanks for contributing an answer to Stack Overflow!