...
lseek(3, 72, SEEK_SET)                  = 72
read(3, "foo\n", 4)                     = 4
lseek(3, 0, SEEK_CUR)                   = 76
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({1, 0}, {1, 0})               = 0
nanosleep({0, 0}, NULL)                 = 0
write(1, "foo\n", 4foo
)                    = 4
...