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| To: | cygwin AT cygwin DOT com |
| Date: | Sat, 05 Mar 2005 04:06:51 -0500 |
| Subject: | apparent bug: incorrect file position after write() |
| Message-Id: | <20050305090651.B2AB31CE32B@ws1-6.us4.outblaze.com> |
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------------=_1110013611-15189-0
Content-Type: text/plain; charset="iso-8859-1"
Content-Disposition: inline
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I'm experiencing unexpected behaviour under cygwin that as far as I=20
know doesn't happen under linux. I don't have access to linux to=20
test at present.
Some successful write()s to a file increment the file's position by=20
more than the count argument. The extra byte(s) are added to the=20
file's size and can be read by lseek()ing to the exact location=20
where the extra byte(s) start. When reading from a location prior=20
to this location the extra byte(s) become invisible although they=20
can affect the values returned from read() and lseek().
I have other priorities that prevent me from debugging the cygwin=20
source code however I have produced some code that reliably=20
replicates the problem. I have attached two source files, one of=20
which is the bare minimum to reproduce the problem and the other of=20
which does a bit more analysis. They can each be compiled simply=20
by giving the filename as an argument to gcc.
Also attached is a file with the contents of a shell session where=20
I demonstrate the results I am getting from the programs on this=20
machine. Finally I have attached the results of the cygcheck -s -v=20
-r command. The 'xyz' directory is not its actual name but this as=20
far as I can see is irrelevant to the problem.
Have at it folks...
--=20
___________________________________________________________
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------------=_1110013611-15189-0
Content-Type: text/plain; name="shell.txt"
Content-Disposition: attachment; filename="shell.txt"
Content-Transfer-Encoding: quoted-printable
=0D
This is a copy of my shell interaction:=0D
=0D
$ ls -l=0D
total 13=0D
-rw-r--r-- 1 Dan all 1980 Mar 5 17:56 shortnsweet.c=0D
-rw-r--r-- 1 Dan all 10962 Mar 5 17:48 writetest.c=0D
$ gcc shortnsweet.c -o shortnsweet=0D
$ ./shortnsweet=0D
chkwrite:: extra bytes written (according to lseek)=0D
supposed to be : 1 byte(s)=0D
actual : 2 byte(s)=0D
file pos (pre-wr ): 10=0D
file pos (post-wr ): 12=0D
file size (fstat) : 12=0D
$ ls -l tstfile=0D
-rw-r--r-- 1 Dan all 16 Mar 5 18:05 tstfile=0D
$ gcc writetest.c -o writetest=0D
$ ./writetest=0D
chkwrite:: extra bytes written (according to lseek)=0D
supposed to be : 1 byte(s)=0D
actual : 2 byte(s)=0D
total bytes written: 11=0D
file pos (pre-wr ): 10=0D
file pos (post-wr ): 12=0D
file size (fstat) : 12=0D
wrote : 0xa=0D
read back : 0xa=0D
inconsistency:: showing chkread errors:=0D
chkread:: too few bytes read (according to return value of read)=0D
supposed to be : 2 byte(s)=0D
actual : 1 byte(s)=0D
file pos (pre-rd) : 10=0D
file pos (post-rd) : 12=0D
read : 0xa=0D
examine_inconsistency:: read 1 (extra bytes) bytes:: 0xa=0D
examine_inconsistency:: showing chkread errors (intended):=0D
chkread:: extra bytes read (according to lseek)=0D
supposed to be : 1 byte(s)=0D
actual : 2 byte(s)=0D
file pos (pre-read): 10=0D
file pos (post-rd) : 12=0D
read : 0xa=0D
examine_inconsistency:: showing chkread errors (intended and extra):=0D
chkread:: too few bytes read (according to return value of read)=0D
supposed to be : 2 byte(s)=0D
actual : 1 byte(s)=0D
file pos (pre-rd) : 10=0D
file pos (post-rd) : 12=0D
read : 0xa=0D
examine_inconsistency:: showing chkread errors (intended and extra+1):=0D
chkread:: too few bytes read (according to return value of read)=0D
supposed to be : 3 byte(s)=0D
actual : 2 byte(s)=0D
file pos (pre-rd) : 10=0D
file pos (post-rd) : 13=0D
read : 0xa 0xb=0D
read_and_fprint_file:: showing chkread errors (entire file):=0D
chkread:: too few bytes read (according to return value of read)=0D
supposed to be : 16 byte(s)=0D
actual : 15 byte(s)=0D
file pos (pre-rd) : 0=0D
file pos (post-rd) : 16=0D
read : 0 0x1 0x2 0x3 0x4 0x5 0x6 0x7 0x8 0x9 0xa 0xb =
0xc 0xd 0xe=0D
chklseek_then_read_byte:: read 0 at pos 0=0D
chklseek_then_read_byte:: read 0x1 at pos 0x1=0D
chklseek_then_read_byte:: read 0x2 at pos 0x2=0D
chklseek_then_read_byte:: read 0x3 at pos 0x3=0D
chklseek_then_read_byte:: read 0x4 at pos 0x4=0D
chklseek_then_read_byte:: read 0x5 at pos 0x5=0D
chklseek_then_read_byte:: read 0x6 at pos 0x6=0D
chklseek_then_read_byte:: read 0x7 at pos 0x7=0D
chklseek_then_read_byte:: read 0x8 at pos 0x8=0D
chklseek_then_read_byte:: read 0x9 at pos 0x9=0D
chklseek_then_read_byte:: read 0xa at pos 0xa=0D
chklseek_then_read_byte:: read 0xa at pos 0xb=0D
chklseek_then_read_byte:: read 0xb at pos 0xc=0D
chklseek_then_read_byte:: read 0xc at pos 0xd=0D
chklseek_then_read_byte:: read 0xd at pos 0xe=0D
$ ls -l tstfile=0D
-rw-r--r-- 1 Dan all 16 Mar 5 18:07 tstfile=0D
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