1 /* __gmp_invalid_operation -- invalid floating point operation. 2 3 THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY. THEY'RE ALMOST 4 CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN 5 FUTURE GNU MP RELEASES. 6 7 Copyright 2003 Free Software Foundation, Inc. 8 9 This file is part of the GNU MP Library. 10 11 The GNU MP Library is free software; you can redistribute it and/or modify 12 it under the terms of either: 13 14 * the GNU Lesser General Public License as published by the Free 15 Software Foundation; either version 3 of the License, or (at your 16 option) any later version. 17 18 or 19 20 * the GNU General Public License as published by the Free Software 21 Foundation; either version 2 of the License, or (at your option) any 22 later version. 23 24 or both in parallel, as here. 25 26 The GNU MP Library is distributed in the hope that it will be useful, but 27 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 28 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 29 for more details. 30 31 You should have received copies of the GNU General Public License and the 32 GNU Lesser General Public License along with the GNU MP Library. If not, 33 see https://www.gnu.org/licenses/. */ 34 35 #include "config.h" 36 37 #include <signal.h> 38 #include <stdlib.h> 39 40 #if HAVE_UNISTD_H 41 #include <unistd.h> /* for getpid */ 42 #endif 43 44 #include "gmp.h" 45 #include "gmp-impl.h" 46 47 48 /* Incidentally, kill is not available on mingw, but that's ok, it has raise 49 and we'll be using that. */ 50 #if ! HAVE_RAISE 51 #define raise(sig) kill (getpid(), sig) 52 #endif 53 54 55 /* __gmp_invalid_operation is for an invalid floating point operation, like 56 mpz_set_d on a NaN or Inf. It's done as a subroutine to minimize code in 57 places raising an exception. 58 59 feraiseexcept(FE_INVALID) is not used here, since unfortunately on most 60 systems it would require libm. 61 62 Alternatives: 63 64 It might be possible to check whether a hardware "invalid operation" trap 65 is enabled or not before raising a signal. This would require all 66 callers to be prepared to continue with some bogus result. Bogus returns 67 are bad, but presumably an application disabling the trap is prepared for 68 that. 69 70 On some systems (eg. BSD) the signal handler can find out the reason for 71 a SIGFPE (overflow, invalid, div-by-zero, etc). Perhaps we could get 72 that into our raise too. 73 74 i386 GLIBC implements feraiseexcept(FE_INVALID) with an asm fdiv 0/0. 75 That would both respect the exceptions mask and give a reason code in a 76 BSD signal. */ 77 78 void 79 __gmp_invalid_operation (void) 80 { 81 raise (SIGFPE); 82 abort (); 83 } 84