msgsnd

Msgsnd is a system call in Unix-like operating systems used for sending messages to a message queue. It is part of the System V message queue API, which provides a way for processes to communicate with each other by exchanging messages. The msgsnd function is used to add a message to a specified message queue. The message queue is identified by a unique key, which is typically obtained using the ftok function. The msgsnd function takes several parameters, including the message queue identifier, a pointer to the message structure, the size of the message, and flags that control the behavior of the function. If the message queue is full, the msgsnd function can block until space becomes available, or it can return immediately with an error if the MSG_NOERROR flag is set. The msgsnd function is commonly used in inter-process communication (IPC) scenarios where processes need to exchange data asynchronously. It is important to note that the System V message queue API is not part of the POSIX standard, and its availability may vary across different Unix-like operating systems.