Mercurial > sdl-ios-xcode
view src/libm/s_copysign.c @ 3068:b21348d47cab
Fixed bug #633
Description From Michael Stone 2008-09-25 19:27:29 (-) [reply]
To determine whether a pid is occupied with the kill(pid, 0) idiom, you have to
test
#include <signal.h>
#include <errno.h>
kill(pid, 0) < 0 && errno == ESRCH
not just
#include <signal.h>
kill(pid, 0) < 0
otherwise you get incorrect results when pid is running as a different user
(causing kill(pid, 0) to return -1 + EPERM).
src/audio/alsa/SDL_alsa_audio.c is certainly affected by this bug in both
1.2.13 and 1.3-trunk. It probably occurs in other places as well.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 17 Feb 2009 05:17:51 +0000 |
| parents | a98604b691c8 |
| children | dc1eb82ffdaa |
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/* @(#)s_copysign.c 5.1 93/09/24 */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #if defined(LIBM_SCCS) && !defined(lint) static char rcsid[] = "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $"; #endif /* * copysign(double x, double y) * copysign(x,y) returns a value with the magnitude of x and * with the sign bit of y. */ #include "math.h" #include "math_private.h" libm_hidden_proto(copysign) #ifdef __STDC__ double copysign(double x, double y) #else double copysign(x, y) double x, y; #endif { u_int32_t hx, hy; GET_HIGH_WORD(hx, x); GET_HIGH_WORD(hy, y); SET_HIGH_WORD(x, (hx & 0x7fffffff) | (hy & 0x80000000)); return x; } libm_hidden_def(copysign)