stdlib.h File Reference

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Data Structures
struct	div_t
struct	ldiv_t

Macros
#define	__need_NULL
#define	__need_size_t
#define	__need_wchar_t
#define	__ptr_t   void *
#define	RAND_MAX   0x7FFF

Typedefs
typedef int(*	__compar_fn_t )(const void *, const void *)

Functions
void	abort (void) __ATTR_NORETURN__
int	abs (int __i)
long	labs (long __i)
void *	bsearch (const void *__key, const void *__base, size_t __nmemb, size_t __size, int(*__compar)(const void *, const void *))
div_t	div (int __num, int __denom) __asm__("__divmodhi4")
ldiv_t	ldiv (long __num, long __denom) __asm__("__divmodsi4")
void	qsort (void *__base, size_t __nmemb, size_t __size, __compar_fn_t __compar)
long	strtol (const char *__nptr, char **__endptr, int __base)
unsigned long	strtoul (const char *__nptr, char **__endptr, int __base)
long	atol (const char *__s) __ATTR_PURE__
int	atoi (const char *__s) __ATTR_PURE__
void	exit (int __status) __ATTR_NORETURN__
void *	malloc (size_t __size) __ATTR_MALLOC__
void	free (void *__ptr)
void *	calloc (size_t __nele, size_t __size) __ATTR_MALLOC__
void *	realloc (void *__ptr, size_t __size) __ATTR_MALLOC__
double	strtod (const char *__nptr, char **__endptr)
double	atof (const char *__nptr)
int	rand (void)
void	srand (unsigned int __seed)
int	rand_r (unsigned long *__ctx)
int	atexit (void(*)(void))
int	system (const char *)
char *	getenv (const char *)

Variables
size_t	__malloc_margin
char *	__malloc_heap_start
char *	__malloc_heap_end

Non-standard (i.e. non-ISO C) functions.
#define	RANDOM_MAX   0x7FFFFFFF
char *	itoa (int val, char *s, int radix)
char *	ltoa (long val, char *s, int radix)
char *	utoa (unsigned int val, char *s, int radix)
char *	ultoa (unsigned long val, char *s, int radix)
long	random (void)
void	srandom (unsigned long __seed)
long	random_r (unsigned long *__ctx)

Conversion functions for double arguments.
Note that these functions are not located in the default library, libc.a, but in the mathematical library, libm.a. So when linking the application, the -lm option needs to be specified.
#define	DTOSTR_ALWAYS_SIGN   0x01 /* put '+' or ' ' for positives */
#define	DTOSTR_PLUS_SIGN   0x02 /* put '+' rather than ' ' */
#define	DTOSTR_UPPERCASE   0x04 /* put 'E' rather 'e' */
#define	EXIT_SUCCESS   0
#define	EXIT_FAILURE   1
char *	dtostre (double __val, char *__s, unsigned char __prec, unsigned char __flags)
char *	dtostrf (double __val, signed char __width, unsigned char __prec, char *__s)