Difference between
modified post 5720b by Anonymous on Mon 14th Feb 2022 11:34
original post 4a7905 by Anonymous on Wed 2nd Feb 2022 10:15
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#include <stdlib.h>

1	1		#include <stdlib.h>
2	2		#include <string.h>
3	3		#include <stdio.h>
4	4		#include <setjmp.h>
5	5		#include <signal.h>
6	6		#include <math.h>
7	7		#include <fenv.h>
	8	+	#include <limits.h>
8	9
9	10		#include <stdexcept>
10	11		#include <iostream>
	12	+	#include <cfloat>
11	13
12	14
13	15		static sigjmp_buf jmp_env;
14	16		static volatile siginfo_t saved_siginfo;
15	17
16	18		static void sigfpe_handler(int num, siginfo_t info, void ucontext)
17	19		{
18	20		(void)num;
19	21		(void)ucontext;
20	22
21	23		(void)feclearexcept(FE_ALL_EXCEPT);
22	24		(void)memcpy((void *)&saved_siginfo, info, sizeof(saved_siginfo));
23	25
24		-	#if 0
	26	+	#if 1
25	27		siglongjmp(jmp_env, 1);
26	28		#else
27	29		throw std::invalid_argument( "you violated the fp math rules" );
28	30		#endif
29	31		}
30	32
31	33		int main(int ac, char *av[])
32	34		{
33	35		struct sigaction action;
34	36		int ret;
35	37		int i = 0, j = 0;
36	38
37	39		(void)puts("#start.");
38	40
39	41		(void)memset(&action, 0, sizeof action);
40	42
41	43		action.sa_sigaction = sigfpe_handler;
42	44		(void)sigemptyset(&action.sa_mask);
43	45		action.sa_flags = SA_SIGINFO;
44	46		(void)sigaction(SIGFPE, &action, NULL);
45	47
	48	+	int mask = feenableexcept(
46	55
47	56		try
48	57		{
49	58		ret = sigsetjmp(jmp_env, 1);
50	59		if (ret) {
51	60		(void)puts("#got_signal");
52	61		}
53	62		else
54	63		{
55	64		(void)puts("#begin_math");
	65	+	#if 1
56	73		i = i / j;
	74	+	#endif
57	81		(void)puts("#end_math");
58	82		}
59	83		}
60	84		catch( const std::invalid_argument &e )
61	85		{
62		-	std::cout << std::string("#got_exception ")+e.what()+" \n";
	86	+	std::cout << std::string("#got_exception '") + e.what() + "' \n";
63	87		}
64	88
65	89		(void)printf("i=%d, j=%d\n", i, j);
66	90
67	91		(void)puts("#end.");
68	92		return EXIT_SUCCESS;
69	93		}
70	94