Linux Programmer’s Manual
cfree − free allocated memory
/* 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(): _BSD_SOURCE || _SVID_SOURCE
This function should never be used. Use free(3) instead.
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 some-
times in <malloc.h>.
Some SCO and Solaris versions have malloc libraries with a 3-argument cfree(), apparently as an analog to
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.
The 3-argument version of cfree() as used by SCO conforms to the iBCSe2 standard: Intel386 Binary Com-
patibility Specification, Edition 2.
This page is part of release 3.24 of the Linux man-pages project. A description of the project, and informa-
tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.