Okay processing of 'Key Mod1-Left' event.
=================================================================
read(0, "K", 1)                         = 1
read(0, "e", 1)                         = 1
read(0, "y", 1)                         = 1
read(0, " ", 1)                         = 1
read(0, "M", 1)                         = 1
read(0, "o", 1)                         = 1
read(0, "d", 1)                         = 1
read(0, "1", 1)                         = 1
read(0, "-", 1)                         = 1
read(0, "L", 1)                         = 1
read(0, "e", 1)                         = 1
read(0, "f", 1)                         = 1
read(0, "t", 1)                         = 1
read(0, "\n", 1)                        = 1
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
pipe([3, 4])                            = 0
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD], 8) = 0
fork()                                  = 14277
rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
close(4)                                = 0
close(4)                                = -1 EBADF (Bad file descriptor)
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD], 8) = 0
fork()                                  = 14278
rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
close(3)                                = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
rt_sigaction(SIGINT, {0x806e2f8, [], 0x4000000}, {0x807a900, [], 0x4000000}, 8) = 0
wait4(-1, [WIFEXITED(s) && WEXITSTATUS(s) == 0], 0, NULL) = 14278
wait4(-1, [WIFEXITED(s) && WEXITSTATUS(s) == 0], 0, NULL) = 14277
rt_sigprocmask(SIG_BLOCK, [CHLD TTOU], [CHLD], 8) = 0
rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
rt_sigaction(SIGINT, {0x807a900, [], 0x4000000}, {0x806e2f8, [], 0x4000000}, 8) = 0
close(3)                                = -1 EBADF (Bad file descriptor)
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGCHLD (Child exited) ---
wait4(-1, 0xbfffee00, WNOHANG, NULL)    = 0
sigreturn()                             = ? (mask now [])
ioctl(0, SNDCTL_TMR_TIMEBASE, 0xbffff50c) = -1 EINVAL (Invalid argument)
_llseek(0, 0, 0xbffff598, SEEK_CUR)     = -1 ESPIPE (Illegal seek)