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.

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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