% cat testdiv2.c
main() {
int i;
i = div2(-1);
printf("-1/2 = %d\n", i);
}
div2(i) {
int j;
j = i>>1;
return(j);
}
% cc -g testdiv2.c
% a.out
-1/2 = -1
% sdb
No core image # Warning message from sdb
*/^div2 # Search for procedure "div2"
6: div2(i) { # It starts at line 6
*z # Print the next few lines
6: div2(i) {
7: int j;
8: j = i>>1;
9: return(j);
10: }
*div2:b # Place a breakpoint at beginning of div2
div2:8 b # Sdb echoes proc name and line number
*r # Run the procedure
Breakpoint at # Execution stops just before line 8
div2:8: j = i>>1;
*t # Print trace of subroutine calls
div2(-1) [testdiv2.c:8]
main(1,2147483380,2147483388) [testdiv2.c:3]
*i/ # Print i
-1
*s # Single step
div2:9: return(j); # Execution stops just before line 9
*j/ # Print j
-1
*8d # Delete the breakpoint
*div2(1)/ # Try running div2 with different args
0
*div2(-2)/
-1
*div2(-3)/
-2
*q # Exit sdb
