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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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cfree(3) Library Functions Manual cfree(3)
cfree - free allocated memory
Standard C library (libc, -lc)
#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[.size * .num], unsigned int num, unsigned int size);
/* In Solaris watchmalloc.so.1 */
void cfree(void ptr[.elsize * .nelem], 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 glibc 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 3-argument version of cfree() as used by SCO conforms to the
iBCSe2 standard: Intel386 Binary Compatibility Specification,
Edition 2.
None.
Removed in glibc 2.26.
malloc(3)
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Linux man-pages 6.9.1 2024-05-02 cfree(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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