C process control

C process control refers to a group of functions in the standard library of the C programming language implementing basic process control operations.[1][2] The process control operations include actions such as termination of the program with various levels of cleanup, running an external command interpreter or accessing the list of the environment operations.

C standard library (libc)
General topics
Miscellaneous headers

Overview of functions

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

Function Description
Terminating
a program		 abort causes abnormal program termination (without cleaning up)
exit causes normal program termination with cleaning up
_Exit causes normal program termination without cleaning up (C99)
atexit registers a function to be called on exit() invocation
quick_exit causes normal program termination without cleaning up, but with IO buffers flushed (C11)
at_quick_exit registers a function to be called on quick_exit() invocation
Communicating with
the environment		 getenv accesses the list of the environment variables
system calls the host environment's command processor

References
  1. Crawford, Tony; Peter Prinz (December 2005). C in a Nutshell. §16.11 – Process Control: O'Reilly. p. 618. ISBN 0-596-00697-7.{{cite book}}: CS1 maint: location (link)
  2. ISO/IEC 9899:1999 specification (PDF). p. 315, § 7.20.4 "Communication with the environment". Retrieved 25 November 2011.
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