Program support utilities

Program termination

The following functions manage program termination and resource cleanup.

Defined in header <cstdlib>
abort	causes abnormal program termination (without cleaning up) (function)
exit	causes normal program termination with cleaning up (function)
quick_exit (C++11)	causes quick program termination without completely cleaning up (function)
_Exit (C++11)	causes normal program termination without cleaning up (function)
atexit	registers a function to be called on std::exit() invocation (function)
at_quick_exit (C++11)	registers a function to be called on std::quick_exit invocation (function)
EXIT_SUCCESSEXIT_FAILURE	indicates program execution status (macro constant)

Unreachable control flow

Defined in header <utility>
unreachable (C++23)	marks unreachable point of execution (function)

Communicating with the environment

Defined in header <cstdlib>
system	calls the host environment's command processor (function)
getenv	access to the list of environment variables (function)

Signals

Several functions and macro constants for signal management are provided.

Defined in header <csignal>
signal	sets a signal handler for particular signal (function)
raise	runs the signal handler for particular signal (function)
sig_atomic_t	the integer type that can be accessed as an atomic entity from an asynchronous signal handler (typedef)
SIG_DFLSIG_IGN	defines signal handling strategies (macro constant)
SIG_ERR	return value of signal specifying that an error was encountered (macro constant)
Signal types
SIGABRTSIGFPESIGILLSIGINTSIGSEGVSIGTERM	defines signal types (macro constant)

Non-local jumps

Defined in header <csetjmp>
setjmp	saves the context (function macro)
longjmp	jumps to specified location (function)
Types
jmp_buf	execution context type (typedef)

See also

C documentation for Program support utilities