The process control block in the Linux operating system is represented by the C structure task struct, which is found in the ##BAD TAG##ched.h> include file in the kernel source-code directory. This structure contains all the necessary information for representing a process, including the state of the process, scheduling and memory-management information, list of open files, and pointers to the process’s parent and a list of its children and siblings. (A process’s parent is the process that created it; its children are any processes that it creates. Its siblings are children with the same parent process.