How do I handle partial reads/writes on sockets in C++?

Handling partial reads and writes on sockets in C++ is crucial for ensuring that data transmission over network connections is reliable and efficient. In socket programming, it is common that a read/write operation does not complete fully, and therefore, developers must implement logic to handle these scenarios.

Handling Partial Reads

When you read from a socket, you may not receive all the data you expect in a single read operation. To handle this, you can use a loop to keep reading until you receive all the expected bytes.

Example of Partial Reads


        #include 
        #include 
        #include 
        
        ssize_t readFully(int socket, void *buffer, size_t length) {
            ssize_t totalBytesRead = 0;
            while (totalBytesRead < length) {
                ssize_t bytesRead = read(socket, static_cast(buffer) + totalBytesRead, length - totalBytesRead);
                if (bytesRead < 1) {
                    // Handle error or connection closed
                    return bytesRead;
                }
                totalBytesRead += bytesRead;
            }
            return totalBytesRead;
        }

Handling Partial Writes

Similarly, when writing to a socket, it is possible that not all data specified in the write call is sent. You should also loop to ensure all data is transmitted.

Example of Partial Writes


        ssize_t writeFully(int socket, const void *buffer, size_t length) {
            ssize_t totalBytesWritten = 0;
            while (totalBytesWritten < length) {
                ssize_t bytesWritten = write(socket, static_cast(buffer) + totalBytesWritten, length - totalBytesWritten);
                if (bytesWritten < 1) {
                    // Handle error or connection closed
                    return bytesWritten;
                }
                totalBytesWritten += bytesWritten;
            }
            return totalBytesWritten;
        }

How do I handle partial reads/writes on sockets in C++?

Handling Partial Reads

Example of Partial Reads

Handling Partial Writes

Example of Partial Writes

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How do I handle partial reads/writes on sockets in C++?

Handling Partial Reads

Example of Partial Reads

Handling Partial Writes

Example of Partial Writes

Related Questions

Popular Topics

Recent Languages