Unix domain socket max message size

1. What is the maximum message size in Unix socket?
2. What is the maximum socket message size?
3. What is the maximum socket size in Linux?
4. Is Unix socket reliable?

What is the maximum message size in Unix socket?

Note: The maximum send buffer size is 1,048,576 bytes.

What is the maximum socket message size?

The maximum send buffer size is 1,048,576 bytes. The default value of the SO_SNDBUF option is 32767. For a TCP socket, the maximum length that you can specify is 1 GB.

What is the maximum socket size in Linux?

Atomic size is 4096 bytes, max size is 65536 bytes.

Is Unix socket reliable?

Unix sockets are reliable. If the reader doesn't read, the writer blocks. If the socket is a datagram socket, each write is paired with a read. If the socket is a stream socket, the kernel may buffer some bytes between the writer and the reader, but when the buffer is full, the writer will block.