Algorithms - sorting, searching, etc.

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

Functions with variable numbers of arguments - Functions with variable number of arguments (vararg, stdarg, va_arg, etc.)

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

Bit-strings - Data structures implementing bit vectors, bit arrays

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

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

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

(The following links to subjects at this site retain your personalized selections.)

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.

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