getpid()  = 11386
close(255)                              = 0
rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) = 0
rt_sigaction(SIGTSTP, {SIG_DFL}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGTTIN, {SIG_DFL}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGTTOU, {SIG_DFL}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGINT, {SIG_DFL}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGQUIT, {SIG_DFL}, {SIG_IGN}, 8) = 0
rt_sigaction(SIGCHLD, {SIG_DFL}, {0x431320, [], 0x4000000}, 8) = 0
rt_sigaction(SIGCHLD, {0x431320, [], 0x4000000}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGINT, {0x43fad0, [], 0x4000000}, {SIG_DFL}, 8) = 0
dup2(4, 1)                              = 1
close(4)                                = 0
close(3)                                = 0
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) = 0
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [RTMIN], 8) = 0
pipe([3, 4])                            = 0
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD RTMIN], 8) = 0
fork()                                  = 11387
rt_sigprocmask(SIG_SETMASK, [CHLD RTMIN], NULL, 8) = 0
close(4)                                = 0
close(4)                                = -1 EBADF (Bad file descriptor)
pipe([4, 5])                            = 0
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD RTMIN], 8) = 0
fork()                                  = 11388
rt_sigprocmask(SIG_SETMASK, [CHLD RTMIN], NULL, 8) = 0
close(3)                                = 0
close(5)                                = 0
close(3)                                = -1 EBADF (Bad file descriptor)
close(5)                                = -1 EBADF (Bad file descriptor)
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD RTMIN], 8) = 0
fork()                                  = 11389
rt_sigprocmask(SIG_SETMASK, [CHLD RTMIN], NULL, 8) = 0
close(4)                                = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD RTMIN], 8) = 0
rt_sigprocmask(SIG_SETMASK, [CHLD RTMIN], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD RTMIN], 8) = 0
rt_sigaction(SIGINT, {0x430190, [], 0x4000000}, {0x43fad0, [], 0x4000000}, 8) = 0
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 11387
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0, NULL) = 11389
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 11388
rt_sigprocmask(SIG_SETMASK, [CHLD RTMIN], NULL, 8) = 0
rt_sigaction(SIGINT, {0x43fad0, [], 0x4000000}, {0x430190, [], 0x4000000}, 8) = 0
close(4)                                = -1 EBADF (Bad file descriptor)
rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
wait4(-1, 0x7fbfffe644, WNOHANG, NULL)  = -1 ECHILD (No child processes)
rt_sigreturn(0xffffffffffffffff)        = 0
exit_group(1)                           = ?