Manual Pages  — MEMORY

malloc, free, realloc, calloc, alloca, mmap – general memory allocation operations

LIBRARY SYNOPSIS DESCRIPTION SEE ALSO STANDARDS

Standard C Library (libc, -lc)

#include <stdlib.h>

void *
malloc(size_t size);

void
free(void *ptr);

void *
realloc(void *ptr, size_t size);

void *
calloc(size_t nelem, size_t elsize);

void *
alloca(size_t size);

#include <sys/types.h>

#include <sys/mman.h>

void *
mmap(void * addr, size_t len, int prot, int flags, int fd, off_t offset);

These functions allocate and free memory for the calling process. They are described in the individual manual pages.

These functions, with the exception of alloca() and mmap() conform to ISO/IEC 9899:1990 ("ISO C90").