seek() doesn't reposition a file connection (PR#1287)

Full_Name: Sven Garbade
Version: 1.4.0
OS: Linux i386
Submission from: (NULL) (129.187.254.49)


It seems that seek() can't reposition a file connection, but it can report the
actual file position correctly if the file connection was repositioned by
another function (e.g. readBin()).

R code:

s <- file("p9_os/p9lr_all.mea","rb")
s

description                class                 mode 
"p9_os/p9lr_all.mea"               "file"                 "rb" 
                text               opened             can read 
            "binary"             "opened"                "yes" 
           can write 
                "no"

seek(s, 0, "end")

[1] 0

seek(s)

[1] 0           # file connctor its still at the first position

readBin(s, integer(), 64, size=2)

[1]   103     1   400     1   749     0     0     0     0     0     0     0
[13]     0     0     0     0     0     0     0     0     0     0     0     0
[25]     0     0     0     0     0     0     0     0 11884 25888 25977 11552
[37] 22560     0     0     0     0     0     0     0     0     0     0     0
[49]     0     0     0     0     0     0     0     0     0     0     0     0
[61]     0     0     0     0

seek(s)

[1] 128        # here seek reports the correct postion


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