[Bug server/20557] It seems like that switching output file doesn't work.

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20557

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

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

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() syscalls
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?

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