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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | VERSIONS | CONFORMING TO | SEE ALSO | COLOPHON |
CFREE(3) Linux Programmer's Manual CFREE(3)
cfree - free allocated memory
#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 watchmalloc.so.1 */
void cfree(void *ptr, size_t nelem, size_t elsize);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
cfree():
Since glibc 2.19:
_DEFAULT_SOURCE
Glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE
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
free(3).
An SCO manual writes: "The cfree routine is provided for compliance
to the iBCSe2 standard and simply calls free. The num and size
arguments to cfree are not used."
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.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────┬───────────────┬────────────────────────┐
│Interface │ Attribute │ Value │
├──────────┼───────────────┼────────────────────────┤
│cfree() │ Thread safety │ MT-Safe /* In glibc */ │
└──────────┴───────────────┴────────────────────────┘
The cfree() function was removed from glibc in version 2.26.
The 3-argument version of cfree() as used by SCO conforms to the
iBCSe2 standard: Intel386 Binary Compatibility Specification, Edition
2.
malloc(3)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2017-05-03 CFREE(3)