GRASS GIS 7 Programmer's Manual  7.9.dev(2021)-e5379bbd7
calc.c
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1 
2 #include <unistd.h>
3 #include <signal.h>
4 
5 #include <grass/calc.h>
6 
7 /****************************************************************************/
8 
9 volatile int floating_point_exception;
10 volatile int floating_point_exception_occurred;
11 
12 int columns;
13 
14 /****************************************************************************/
15 
16 static RETSIGTYPE handle_fpe(int n)
17 {
18  floating_point_exception = 1;
19  floating_point_exception_occurred = 1;
20 }
21 
22 void pre_exec(void)
23 {
24 #ifndef __MINGW32__
25 #ifdef SIGFPE
26  struct sigaction act;
27 
28  act.sa_handler = &handle_fpe;
29  act.sa_flags = 0;
30  sigemptyset(&act.sa_mask);
31 
32  sigaction(SIGFPE, &act, NULL);
33 #endif
34 #endif
35 
36  floating_point_exception_occurred = 0;
37 }
38 
39 void post_exec(void)
40 {
41 #ifndef __MINGW32__
42 #ifdef SIGFPE
43  struct sigaction act;
44 
45  act.sa_handler = SIG_DFL;
46  act.sa_flags = 0;
47  sigemptyset(&act.sa_mask);
48 
49  sigaction(SIGFPE, &act, NULL);
50 #endif
51 #endif
52 }
53 
54 /****************************************************************************/
55 
56 void calc_init(int cols)
57 {
58  columns = cols;
59 }
60 
61 /****************************************************************************/
62 
post_exec
void post_exec(void)
Definition: calc.c:39
columns
int columns
Definition: calc.c:12
NULL
#define NULL
Definition: ccmath.h:32
calc_init
void calc_init(int cols)
Definition: calc.c:56
pre_exec
void pre_exec(void)
Definition: calc.c:22
floating_point_exception_occurred
volatile int floating_point_exception_occurred
Definition: calc.c:10
RETSIGTYPE
#define RETSIGTYPE
Definition: config.h:100
floating_point_exception
volatile int floating_point_exception
Definition: calc.c:9