root@einstein:/var/log/mysql# strace -p 11523 -p 11566 -p 11567 -p 11568 -p 11570 -f
Process 11523 attached - interrupt to quit
Process 11566 attached - interrupt to quit
Process 11567 attached - interrupt to quit
Process 11568 attached - interrupt to quit
Process 11570 attached - interrupt to quit
[pid 11523] waitpid(-1,  <unfinished ...>
[pid 11566] rt_sigsuspend([HUP INT QUIT PIPE ALRM TERM TSTP] <unfinished ...>
[pid 11568] getppid( <unfinished ...>
[pid 11570] rt_sigsuspend([HUP INT QUIT PIPE TERM TSTP] <unfinished ...>
[pid 11568] <... getppid resumed> )     = 11566
[pid 11568] poll( <unfinished ...>
[pid 11567] read(0,  <unfinished ...>
[pid 11568] <... poll resumed> [{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll([{fd=3, events=POLLIN}], 1, 2000) = 0
[pid 11568] getppid()                   = 11566
[pid 11568] poll( <unfinished ...>
Process 11523 detached
Process 11566 detached
Process 11567 detached
Process 11568 detached
Process 11570 detached
root@einstein:/var/log/mysql#