Program support utilities

Program termination

The following functions manage program termination and resources cleanup.

Defined in header <stdlib.h>
abort	causes abnormal program termination (without cleaning up) (function)
exit	causes normal program termination with cleaning up (function)
quick_exit (C11)	causes normal program termination without completely cleaning up (function)
_Exit (C99)	causes normal program termination without cleaning up (function)
atexit	registers a function to be called on exit() invocation (function)
at_quick_exit (C11)	registers a function to be called on quick_exit invocation (function)
EXIT_SUCCESS EXIT_FAILURE	indicates program execution execution status (macro constant)

Unreachable control flow

Defined in header <stddef.h>
unreachable (C23)	marks unreachable point of execution (function macro)

Communicating with the environment

Defined in header <stdlib.h>
system	calls the host environment's command processor (function)
getenv getenv_s (C11)	access to the list of environment variables (function)

Memory alignment query

Defined in header <stdlib.h>
memalignment (C23)	queries the alignment of a pointer value (function)

Signals

Several functions and macro constants for signal management are provided.

Defined in header <signal.h>
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_DFL SIG_IGN	defines signal handling strategies (macro constant)
SIG_ERR	error was encountered (macro constant)
Signal types
SIGABRT SIGFPE SIGILL SIGINT SIGSEGV SIGTERM	defines signal types (macro constant)

Non-local jumps

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

References

See also

C++ documentation for Program support utilities