| 1 | #include <unistd.h> |
|---|---|
| 2 | #include <stdio.h> |
| 3 | #include <signal.h> |
| 4 | |
| 5 | static int sigchld_no; |
| 6 | static int nosig_no; |
| 7 | static int weird_value; |
| 8 | |
| 9 | void |
| 10 | sigchld_handler (int signo) |
| 11 | { |
| 12 | sigchld_no++; |
| 13 | printf (format: "Got sigchld %d.\n", sigchld_no); |
| 14 | } |
| 15 | |
| 16 | int |
| 17 | call_me (int some_value) |
| 18 | { |
| 19 | int ret_val = 0; |
| 20 | int i; |
| 21 | for (i = 0; i < some_value; i++) |
| 22 | { |
| 23 | int result = 0; |
| 24 | if (i%2 == 0) |
| 25 | result = kill (pid: getpid(), SIGCHLD); |
| 26 | else |
| 27 | sigchld_no++; |
| 28 | |
| 29 | usleep(useconds: 1000); |
| 30 | if (result == 0) |
| 31 | ret_val++; |
| 32 | } |
| 33 | usleep (useconds: 10000); |
| 34 | return ret_val; |
| 35 | } |
| 36 | |
| 37 | int |
| 38 | call_me_nosig (int some_value) |
| 39 | { |
| 40 | int ret_val = 0; |
| 41 | int i; |
| 42 | for (i = 0; i < some_value; i++) |
| 43 | weird_value += i % 4; |
| 44 | |
| 45 | nosig_no += some_value; |
| 46 | return some_value; |
| 47 | } |
| 48 | |
| 49 | int |
| 50 | main () |
| 51 | { |
| 52 | int ret_val; |
| 53 | signal (SIGCHLD, handler: sigchld_handler); |
| 54 | |
| 55 | ret_val = call_me (some_value: 2); // Stop here in main. |
| 56 | |
| 57 | ret_val = call_me_nosig (some_value: 10); |
| 58 | |
| 59 | return 0; |
| 60 | |
| 61 | } |
| 62 |