Using mob, the code below works on Windows 10 with PE (i386) but hangs on
PE+ (x86_64)
handler function is not entered with x86_64.
Expected behavior with -m32:
c:\tmp>tcc -m32 signal.c && signal
Waiting for SIGSEGV
Got signal 11!! Want to exit? [y/n] y
Exiting from handler...
c:\tmp>tcc -m32 signal.c && signal
Waiting for SIGSEGV
Got signal 11!! Want to exit? [y/n] n
Reinstall handler...
Exiting normally
BUG with -m64
c:\tmp>tcc -m64 signal.c && signal
Waiting for SIGSEGV <<= program terminates after this print!!
c:\tmp>
/// signal.c
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <setjmp.h>
jmp_buf jmp;
void handler(int);
int
main(void) {
signal(SIGSEGV, handler);
(void)printf("Waiting for SIGSEGV\n");
if (setjmp(jmp) == 0) {
char *p = NULL;
*p = 'A'; // force SIGSEGV
} else {
(void)printf("Exiting normally\n");
}
return 0;
}
void
handler(int sig) {
int c = 'y';
signal(sig, SIG_IGN); // <= Same issue with or w.o. this line
fprintf(stderr, "Got signal %d!! Want to exit? [y/n] ", sig);
fflush(stderr);
c = fgetc(stdin);
if (c == 'y' || c == 'Y') {
(void)printf("Exiting from handler...\n");
exit(0);
} else {
(void)printf("Reinstall handler...\n");
signal(SIGINT, handler);
longjmp(jmp, 1);
}
}
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