Stdlib.h

C program control operations are a group of functions in the standard library of the C programming language implementing basic program control operations.

Function overview

The program control functions are defined in the stdlib.h header (cstdlib header in C++).

• abs, labs, llabs - C/C++ - computes absolute value of an integral value

Terminating a program

• abort - C/C++ - causes abnormal program termination (without cleaning up)
• exit - C/C++ - causes normal program termination with cleaning up
• _Exit - C99/C++11 - causes normal program termination without cleaning up
• atexit - C/C++ - registers a function to be called on exit() invocation

Communicating with the environment

• getenv - C/C++ - accesses the list of the environment variables
• system - C/C++ - calls the host environment's command processor