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This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles.

For more information about the manual page format, see the manual page for manpages(5).



MEMORY(3)                BSD Library Functions Manual                MEMORY(3)

NAME
     alloca, calloc, free, malloc, mmap, realloc -- general memory allocation
     operations

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdlib.h>

     void *
     alloca(size_t size);

     void *
     calloc(size_t nelem, size_t elsize);

     void
     free(void *ptr);

     void *
     malloc(size_t size);

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

     #include <sys/mman.h>

     void *
     mmap(void * addr, size_t len, int prot, int flags, int fildes,
         off_t off);

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

LEGACY SYNOPSIS
     #include <sys/types.h>
     #include <sys/mman.h>

     void *
     mmap(void * addr, size_t len, int prot, int flags, int fildes,
     off_t off);

     The include file <sys/types.h> is needed for this function.

COMPATIBILITY
     mmap() now returns with errno set to EINVAL in places that historically
     succeeded.  The rules have changed as follows:

     oo   The flags parameter must specify either MAP_PRIVATE or MAP_SHARED.

     oo   The size parameter must not be 0.

     oo   The off parameter must be a multiple of pagesize, as returned by
         sysconf().

SEE ALSO
     mmap(2), alloca(3), calloc(3), free(3), malloc(3), realloc(3), compat(5)

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

BSD                              June 4, 1993                              BSD