Linux IPC: Data Transfer Methods

In a Linux system, processes can communicate data between each other using the following methods:

1. Pipeline: A pipeline is a form of communication between processes that is semi-duplex, allowing one process to transmit data to another. When using a pipeline, the output of one process is redirected to the input of another process to facilitate data transfer. There are two ways of creating pipelines: anonymous pipelines (created through the pipe system call) and named pipelines (created through the mkfifo system call).
2. Processes can transfer data through reading and writing files. One process can write data to a file, while another process can read data from the file.
3. Shared Memory: Shared Memory is an efficient way for processes to communicate with each other, allowing multiple processes to access the same memory area. Processes can directly access the data in shared memory to transfer information.
4. Signal: Processes can transfer data by sending signals. One process can send a signal to another process, and the receiving process can handle the signal based on the signal processing mechanism and perform relevant operations.
5. Message Queue: It is a method of interprocess communication that allows for asynchronous communication between processes. One process can send a message to the message queue, while another process can receive messages from the queue.
6. Semaphore: Semaphores can be used to control the access of multiple processes to shared resources. Processes can use semaphores for synchronization and mutual exclusion operations, achieving data transfer and access control of shared resources.

Using the methods mentioned above, processes can achieve data transfer and communication in the Linux system. Different methods are suitable for different scenarios, so it is important to choose the appropriate method for interprocess data transfer based on specific needs.