Algorithms - sorting, searching, etc.

Error Handling and Logging - Handling errors and logging. (syslog, error tables, et al)

Real-Time related time of day, elapsed time, sleeping, waiting for events. time(), gmtime(), localtime(), etc.

Math Gateway topic to math and numeric processing routines.

Data structures (In memory) - Data structures in memory. Queues, lists, graphs, trees, etc.

Memory blocks (Sometimes called "Byte Strings") Memory blocks. Allocated, shared, mmaped, kernel et al

Current Process Control control of the currently running process, longjmp, wait, sleep, argument processing

Process Creation and Control covers child process control (like sending signals), renice, fork, et al

Debugging and Tracing (utilities, system and library calls which support debugging and tracing)

Process Signals and Events Sending and handling signals and events.

Running Process Information - Getting information on running processes.

Process Limits Permission and access restriction (files, resources, etc)

Local Process Communication Communication between processes running on the same system. Synchronization. File locking. Signals. FIFOs, pipes, et al

Remote Process Communication Methods of communicating to remote processes. Remote Procedure Calls, sockets, data format translation, et al

Command Shells and Scripting Languages

Local machine and Operating System Information kernel topics, uname, boot, shutdown, et al

Libraries Object (compiled) libraries, linked and dynamically loaded. Static and Shared libraries

DCE - An object-oriented interface to DCE, the Distributed Computing Environment. [Perl] {oss}

Other Libraries, Functions, and Components