Miscellaneous utilities

Names specified for `<stdlib.h>`, “Miscellaneous utilities”
Name	Description	Notes				Source	Availability
`_Exit()`	Terminate program without registered activity				(·)	`<stdlib.h>`				C99	C11
`abort()`	Abort program execution				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`abort_handler_s()`	Report constraint violation and abort		?		(·)	`<stdlib.h>`					C11
`abs()`	Compute absolute value				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`aligned_alloc()`	Allocate memory for specific alignment				(·)	`<stdlib.h>`					C11
`at_quick_exit()`	Register activity on quick termination				(·)	`<stdlib.h>`					C11
`atexit()`	Register activity on normal termination				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`atof()`	Convert string to real				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`atoi()`	Convert string to integer				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`atol()`	Convert string to integer				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`atoll()`	Convert string to integer				(·)	`<stdlib.h>`				C99	C11
`bsearch()`	Search array				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`bsearch_s()`	Search array		?		(·)	`<stdlib.h>`					C11
`calloc()`	Allocate initialised memory				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`constraint_handler_t`	Type of function handling run-time constraint violations		?		T	`<stdlib.h>`					C11
`div()`	Compute quotient and remainder of integer division				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`div_t`	Result of integer division				T	`<stdlib.h>`	C89	C90	C95	C99	C11
`EXIT_FAILURE`	Indication of program failure			M		`<stdlib.h>`	C89	C90	C95	C99	C11
`EXIT_SUCCESS`	Indication of program success			M		`<stdlib.h>`	C89	C90	C95	C99	C11
`errno_t`	Error-number type		?		T	Headers					C11
`exit()`	Terminate program				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`free()`	Release memory				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`getenv()`	Get environment string				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`getenv_s()`	Get environment string		?		(·)	`<stdlib.h>`					C11
`ignore_handler_s()`	No operation		?		(·)	`<stdlib.h>`					C11
`labs()`	Compute absolute value				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`ldiv()`	Compute quotient and remainder of integer division				(·)	`<stdlib.h>`				C99	C11
`ldiv_t`	Result of integer division				T	`<stdlib.h>`				C99	C11
`llabs()`	Compute absolute value				(·)	`<stdlib.h>`				C99	C11
`lldiv()`	Compute quotient and remainder of integer division				(·)	`<stdlib.h>`				C99	C11
`lldiv_t`	Result of integer division				T	`<stdlib.h>`				C99	C11
`MB_CUR_MAX`	Maximum multibyte character length in current locale			M		`<stdlib.h>`	C89	C90	C95	C99	C11
`malloc()`	Allocate memory for all alignments				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`mblen()`	Compute multibyte character length				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`mbstowcs()`	Convert multibyte string to wide string				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`mbstowcs_s()`	Convert multibyte string to wide string				(·)	`<stdlib.h>`					C11
`mbtowc()`	Convert multibyte character to wide character				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`NULL`	Null pointer constant	L		M		Headers	C89	C90	C95	C99	C11
`qsort()`	Sort array				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`qsort_s()`	Sort array		?		(·)	`<stdlib.h>`					C11
`quick_exit()`	Terminate program without signals				(·)	`<stdlib.h>`					C11
`RAND_MAX`	Maximum of random range			M		`<stdlib.h>`	C89	C90	C95	C99	C11
`rand()`	Generate pseudo-random number				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`realloc()`	Reallocate memory				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`rsize_t`	Implementation-defined size type with implied run-time constraints	L	?		T	Headers					C11
`set_constraint_handler_s()`	Set the constraint handler		?		(·)	`<stdlib.h>`					C11
`size_t`	Implementation-defined size type	H			T	Headers	C89	C90	C95	C99	C11
`srand()`	Seed random-number generator				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`strtod()`	Convert string to real				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`strtof()`	Convert string to real				(·)	`<stdlib.h>`				C99	C11
`strtol()`	Convert string to integer				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`strtold()`	Convert string to real				(·)	`<stdlib.h>`				C99	C11
`strtoll()`	Convert string to integer				(·)	`<stdlib.h>`				C99	C11
`strtoul()`	Convert string to integer				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`strtoull()`	Convert string to integer				(·)	`<stdlib.h>`				C99	C11
`system()`	Execute environment command				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`wchar_t`	Wide-character type	H			T	Headers			C95	C99	C11
`wcstombs()`	Convert wide string to multibyte string				(·)	`<stdlib.h>`			C95	C99	C11
`wcstombs_s()`	Convert wide string to multibyte string		?		(·)	`<stdlib.h>`					C11
`wctomb()`	Convert wide character to multibyte character				(·)	`<stdlib.h>`	C89	C90	C95	C99	C11
`wctomb_s()`	Convert wide character to multibyte character		?		(·)	`<stdlib.h>`					C11

This header is available in C89, C90, C95, C99 and C11.

The header <stdlib.h> declares functions for the following various purposes: