Answering SCO Bit by Bit: a.out.h, errno.h and the GPL

 
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Old 12-14-2009
Answering SCO Bit by Bit: a.out.h, errno.h and the GPL

In SCO's letter to Unix licensees in December of 2003, signed by Ryan Tibbitts, who is still at SCO, one of the files listed as allegedly infringed was this one, on page 2 of the PDF [PDF]:
/include/linux/a.out.h
Another was this one:
include/asm-i386/errno.h
And of course, it was SCO's position that it never released any of its own code under the GPL. However, I was just looking at the source of that very file, linux-include, in the Caldera distribution OpenLinux eServer 2.3, and you'll never guess what I found.
Warning if you are on dialup: graphics ahead.

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

NAME
cfree - free allocated memory SYNOPSIS
#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(): _BSD_SOURCE || _SVID_SOURCE DESCRIPTION
This function should never be used. Use free(3) instead. 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 argu- ments to cfree are not used." RETURN VALUE
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. CONFORMING TO
The 3-argument version of cfree() as used by SCO conforms to the iBCSe2 standard: Intel386 Binary Compatibility Specification, Edition 2. SEE ALSO
malloc(3) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2007-07-26 CFREE(3)