getpid()                                = 11371
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
stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("/bin/which", 0x7fbfffe840)        = -1 ENOENT (No such file or directory)
stat("/sbin/which", 0x7fbfffe840)       = -1 ENOENT (No such file or directory)
stat("/usr/bin/which", {st_mode=S_IFREG|0755, st_size=20224, ...}) = 0
stat("/usr/bin/which", {st_mode=S_IFREG|0755, st_size=20224, ...}) = 0
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [RTMIN], 8) = 0
fork()                                  = 11372
rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [RTMIN], 8) = 0
rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [RTMIN], 8) = 0
rt_sigaction(SIGINT, {0x430190, [], 0x4000000}, {0x43fad0, [], 0x4000000}, 8) = 0
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 11372
rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
wait4(-1, 0x7fbfffe664, WNOHANG, NULL)  = -1 ECHILD (No child processes)
rt_sigreturn(0xffffffffffffffff)        = 0
rt_sigaction(SIGINT, {0x43fad0, [], 0x4000000}, {0x430190, [], 0x4000000}, 8) = 0
exit_group(0)                           = ?