On 05/26/2012 12:28 PM, Jakob Bohm wrote: > On 5/25/2012 5:30 PM, Ken Goldman wrote: >> On 5/25/2012 3:33 AM, Jakob Bohm wrote: >> >>> ANSI C and POSIX free() is NOT required to handle free(NULL) >>> as a NOP. >> >> I checked reputable sources (Plauger, Harbison and Steele, the ANSI >> spec, and the IEEE POSIX spec). >> >> All agree that (e.g. ANSI) >> >> "If ptr is a null pointer, no action occurs." >> >> > Which version of the ANSI Spec, and where did you get a copy? > > I have to rely on secondary sources and experience using various > implementations that claim conformance. >
It looks like a safe assumption to make: The Open Group Base Specifications Issue 7 IEEE Std 1003.1-2008 Copyright © 2001-2008 The IEEE and The Open Group [CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard. The free() function shall cause the space pointed to by ptr to be deallocated; that is, made available for further allocation. If ptr is a null pointer, no action shall occur. Otherwise, if the argument does not match a pointer earlier returned by a function in POSIX.1-2008 that allocates memory as if by malloc(), or if the space has been deallocated by a call to free() or realloc(), the behavior is undefined. Any use of a pointer that refers to freed space results in undefined behavior. RETURN VALUE The free() function shall not return a value. ERRORS No errors are defined. And from my copy of a draft of the C99 standard: 320 Committee Draft — January 18, 1999 WG14/N869 Description 2 The free function causes the space pointed to by ptr to be deallocated, that is, made available for further allocation. If ptr is a null pointer, no action occurs. Otherwise, if the argument does not match a pointer earlier returned by the calloc, malloc, or realloc function, or if the space has been deallocated by a call to free or realloc, the behavior is undefined. Returns 3 The free function returns no value. ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
