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$ strace ./944682.pl ... ... rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 ...
... lseek(3, 72, SEEK_SET) = 72 ... write(1, "foo\n", 4foo ) = 4 ...