[ Replying to the list. ] On Tue, Feb 12, 2008 at 10:48:04PM +0200, Kostik Belousov wrote: > > -int readlink(const char *, char *, int); > > +ssize_t readlink(const char *, char *, size_t); > You do understand that this changes the ABI ? size_t and int have different > sizes on 64-bit arches, and now upper-half of the register used to pass > the third arg is used. Amd64, fortunately, makes very hard to load a > non-zero into the upper half, I am not so sure about IA64/sparc64. I considered that. I've tested locally on amd64 and sparc64, and ia64 on pluto2.freebsd.org. Since this is only a third argument, it's passed in a 64-bit register, and for any meaningful value of it (0 .. INT_MAX), there's no ABI change at all. I compared .s files. : // cc -S a.c ; mv a.s a.s~ ; cc -S -DNEW a.c ; diff -u a.s~ a.s : #include <sys/types.h> : #include <sys/limits.h> : : #ifdef NEW : ssize_t readlink(const char *, char *, size_t); : #else : int readlink(const char *, char *, int); : #endif : : void : foo(void) : { : int i; : char buf[1024]; : : i = readlink("foo", buf, INT_MAX); : } > This change, IMHO, requires symbol version compat shims. I don't think so. Cheers, -- Ruslan Ermilov ru_at_FreeBSD.org FreeBSD committerReceived on Wed Feb 13 2008 - 10:35:38 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:39:27 UTC