projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 5ce2aa3e HK |
1 | % cat testdiv2.c |
| 2 | main() { | |
| 3 | int i; | |
| 4 | i = div2(-1); | |
| 5 | printf("-1/2 = %d\n", i); | |
| 6 | } | |
| 7 | div2(i) { | |
| 8 | int j; | |
| 9 | j = i>>1; | |
| 10 | return(j); | |
| 11 | } | |
| 12 | ||
| 13 | % cc -g testdiv2.c | |
| 14 | ||
| 15 | % a.out | |
| 16 | -1/2 = -1 | |
| 17 | ||
| 18 | % sdb | |
| 19 | No core image # Warning message from sdb | |
| 20 | */^div2 # Search for procedure "div2" | |
| 21 | 6: div2(i) { # It starts at line 6 | |
| 22 | *z # Print the next few lines | |
| 23 | 6: div2(i) { | |
| 24 | 7: int j; | |
| 25 | 8: j = i>>1; | |
| 26 | 9: return(j); | |
| 27 | 10: } | |
| 28 | *div2:b # Place a breakpoint at beginning of div2 | |
| 29 | div2:8 b # Sdb echoes proc name and line number | |
| 30 | *r # Run the procedure | |
| 31 | Breakpoint at # Execution stops just before line 8 | |
| 32 | div2:8: j = i>>1; | |
| 33 | *t # Print trace of subroutine calls | |
| 34 | div2(-1) [testdiv2.c:8] | |
| 35 | main(1,2147483380,2147483388) [testdiv2.c:3] | |
| 36 | *i/ # Print i | |
| 37 | -1 | |
| 38 | *s # Single step | |
| 39 | div2:9: return(j); # Execution stops just before line 9 | |
| 40 | *j/ # Print j | |
| 41 | -1 | |
| 42 | *8d # Delete the breakpoint | |
| 43 | *div2(1)/ # Try running div2 with different args | |
| 44 | 0 | |
| 45 | *div2(-2)/ | |
| 46 | -1 | |
| 47 | *div2(-3)/ | |
| 48 | -2 | |
| 49 | *q # Exit sdb |