stdlib.h File Reference

#include <stddef.h>

Include dependency graph for stdlib.h:

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Data Structures
struct	div_t
struct	ldiv_t
struct	lldiv_t

Macros
#define	EXIT_SUCCESS   0
#define	EXIT_FAILURE   1
#define	RAND_MAX   0x7fffffff
#define	alloca(size)   __builtin_alloca(size)

Functions
void	exit (int status)
	To cause task termination. More...
void *	malloc (size_t size)
	Allocate a memory space. More...
void	free (void *ptr)
	Free a memory space. More...
void *	calloc (size_t nmemb, size_t size)
	Allocate and reset a memory space of an array. More...
void *	realloc (void *ptr, size_t size)
	Resize an allocated memory space, preserving its contents. More...
int	mkstemp (char *template)
	Create a file no other name stands for and open it. The last six characters of the template must be XXXXXX and are replaced with the name the file was given. More...
char *	ltoa (long value, char *buffer, int radix)
int	atoi (const char *nptr)
long	atol (const char *nptr)
long long	atoll (const char *nptr)
long	a64l (const char *str64)
int	abs (int j)
double	atof (const char *nptr)
void *	bsearch (const void *key, const void *base, size_t nmemb, size_t size, int(*compar)(const void *, const void *))
div_t	div (int numerator, int denominator)
int	getsubopt (char **optionp, char *const *tokens, char **valuep)
char *	l64a (long value)
long	labs (long j)
ldiv_t	ldiv (long numerator, long denominator)
long long	llabs (long long j)
lldiv_t	lldiv (long long numerator, long long denominator)
int	mblen (const char *s, size_t n)
size_t	mbstowcs (wchar_t *dest, const char *src, size_t n)
int	mbtowc (wchar_t *pwc, const char *s, size_t n)
void	qsort (void *base, size_t nmemb, size_t size, int(*compar)(const void *, const void *))
char *	realpath (const char *path, char *resolved_path)
double	strtod (const char *nptr, char **endptr)
float	strtof (const char *nptr, char **endptr)
long	strtol (const char *nptr, char **endptr, int base)
long double	strtold (const char *nptr, char **endptr)
long long	strtoll (const char *nptr, char **endptr, int base)
unsigned long	strtoul (const char *nptr, char **endptr, int base)
unsigned long long	strtoull (const char *nptr, char **endptr, int base)
size_t	wcstombs (char *dest, const wchar_t *src, size_t n)
int	wctomb (char *s, wchar_t wc)

Function Documentation

calloc()

void* calloc	(	size_t	nmemb,
		size_t	size
	)

Allocate and reset a memory space of an array.

Parameters

nmemb	Size of the array element.
size	The number of array elements.

Return values

void	*: The pointer to the allocated memory. If the allocation failed, the function returns NULL.

exit()

void exit

(

int

status

)

To cause task termination.

Parameters

status

Not used.

Return values

None

free()

void free

(

void *

ptr

)

Free a memory space.

Parameters

ptr	Pointer to the allocated memory.

Return values

None

malloc()

void* malloc

(

size_t

size

)

Allocate a memory space.

Parameters

size	The number of bytes for allocating a memory space.

Return values

void	*: The pointer to the allocated memory. If the allocation failed, the function returns NULL.

mkstemp()

int mkstemp

(

char *

template

)

Create a file no other name stands for and open it. The last six characters of the template must be XXXXXX and are replaced with the name the file was given.

Parameters

template

The name to make unique, ending in XXXXXX.

Return values

int	The descriptor of the new file, and -1 on error with the reason left in errno.

realloc()

void* realloc	(	void *	ptr,
		size_t	size
	)

Resize an allocated memory space, preserving its contents.

Parameters

ptr	Pointer to the allocated memory, or NULL to allocate anew.
size	The new number of bytes, or zero to free the memory.

Return values

void	*: The pointer to the resized memory, which may differ from ptr. If the allocation failed, the function returns NULL and the memory pointed to by ptr is left untouched.