cfree(3) — Linux manual page


CFREE(3)                  Linux Programmer's Manual                 CFREE(3)

NAME         top

       cfree - free allocated memory

SYNOPSIS         top

       #include <stdlib.h>

       /* In SunOS 4 */
       int cfree(void *ptr);

       /* In glibc or FreeBSD libcompat */
       void cfree(void *ptr);

       /* In SCO OpenServer */
       void cfree(char *ptr, unsigned num, unsigned size);

       /* In Solaris */
       void cfree(void *ptr, size_t nelem, size_t elsize);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

           Since glibc 2.19:
           Glibc 2.19 and earlier:
               _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION         top

       This function should never be used.  Use free(3) instead.  Starting
       with version 2.26, it has been removed from glibc.

   1-arg cfree
       In glibc, the function cfree() is a synonym for free(3), "added for
       compatibility with SunOS".

       Other systems have other functions with this name.  The declaration
       is sometimes in <stdlib.h> and sometimes in <malloc.h>.

   3-arg cfree
       Some SCO and Solaris versions have malloc libraries with a 3-argument
       cfree(), apparently as an analog to calloc(3).

       If you need it while porting something, add

           #define cfree(p, n, s) free((p))

       to your file.

       A frequently asked question is "Can I use free(3) to free memory
       allocated with calloc(3), or do I need cfree()?"  Answer: use

       An SCO manual writes: "The cfree routine is provided for compliance
       to the iBCSe2 standard and simply calls free.  The num and size argu‐
       ments to cfree are not used."

RETURN VALUE         top

       The SunOS version of cfree() (which is a synonym for free(3)) returns
       1 on success and 0 on failure.  In case of error, errno is set to
       EINVAL: the value of ptr was not a pointer to a block previously
       allocated by one of the routines in the malloc(3) family.

VERSIONS         top

       The cfree() function was removed from glibc in version 2.26.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface Attribute     Value                  │
       │cfree()   │ Thread safety │ MT-Safe /* In glibc */ │

CONFORMING TO         top

       The 3-argument version of cfree() as used by SCO conforms to the
       iBCSe2 standard: Intel386 Binary Compatibility Specification, Edition

SEE ALSO         top


COLOPHON         top

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                                 2017-09-15                         CFREE(3)