mysql_pid is a utility for terminating processes. It runs on Unix-like systems, making use of the kill() system call.
From MariaDB 10.4.6, mariadb-waitpid is a symlink to mysql_waitpid.
From MariaDB 10.5.2, mysql_waitpid is the symlink, and mariadb-waitpid the binary name.
See mariadb-waitpid for details.
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https://mariadb.com/kb/en/mysql_waitpid/