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From: "dsmith at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug server/20557] It seems like that switching output file doesn't work.
Date: Fri, 09 Sep 2016 13:45:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D20557

--- Comment #18 from David Smith <dsmith at redhat dot com> ---
After looking at the strace files you attached, I'm quite confused:

=3D=3D=3D=3D
# grep f.out strace.out.*
strace.out.29045:execve("/usr/bin/staprun", ["/usr/bin/staprun", "-o", "f.o=
ut",
"-R", "-S", "1,3", "renamemod.ko"], [/* 20 vars */]) =3D 0
strace.out.29045:execve("/usr/lib/systemtap/stapio",
["/usr/lib/systemtap/stapio", "-o", "f.out", "-R", "-S", "1,3", "ren_29045",
"-F3"], [/* 20 vars */]) =3D 0
strace.out.29045:open("/root/systemtap/examples/f.out.0",
O_WRONLY|O_CREAT|O_TRUNC, 0666) =3D 6
strace.out.29048:open("/root/systemtap/examples/f.out.1",
O_WRONLY|O_CREAT|O_TRUNC, 0666) =3D 6
strace.out.29048:open("/root/systemtap/examples/f.out.2",
O_WRONLY|O_CREAT|O_TRUNC, 0666) =3D 6
strace.out.29048:unlink("/root/systemtap/examples/f.out.0") =3D 0
strace.out.29048:open("/root/systemtap/examples/f.out.3",
O_WRONLY|O_CREAT|O_TRUNC, 0666) =3D 6
strace.out.29048:unlink("/root/systemtap/examples/f.out.1") =3D 0
strace.out.29048:open("/root/systemtap/examples/f.out.4",
O_WRONLY|O_CREAT|O_TRUNC, 0666) =3D 6
strace.out.29048:unlink("/root/systemtap/examples/f.out.2") =3D 0
strace.out.29048:open("/root/systemtap/examples/f.out.5",
O_WRONLY|O_CREAT|O_TRUNC, 0666) =3D 6
=3D=3D=3D=3D

That strace output clearly shows systemtap creating f.out.0, f.out.1, f.out=
.2,
unlinking f.out.0, creating f.out.3, unlinking f.out.1, creating f.out.4,
unlinking f.out.2, and creating f.out.5. All the open() and unlink() syscal=
ls
succeed.

At this point I'm not sure what is going on with your system. Perhaps you
should try running systemtap again in an empty directory?

--=20
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