| got signal | |
| trap -- 'echo got signal' USR1 | |
| sent 1 signal | |
| got signal | |
| wait interrupted | |
| trap -- 'echo got signal' USR1 | |
| sent 2 signal | |
| got signal | |
| wait interrupted | |
| trap -- 'echo got signal' USR1 | |
| sent 3 signal | |
| got signal | |
| wait interrupted | |
| trap -- 'echo got signal' USR1 | |
| sent 4 signal | |
| got signal | |
| wait interrupted | |
| trap -- 'echo got signal' USR1 | |
| sent 5 signal | |
| sleep completed |