Mail Archives: cygwin/2002/05/26/16:58:33
CygWinners - hi again,
since i got no reply to my mkcramfs porting question (ok - mybe it's too special
and i'm too impatiently - sorry),
i spend some time on trying it myself.
I was really wondering how far I git - better said, it's nearly done! :)
Beside of a little bug, it works basically - i can create compressed ram
filesystems under windows now.
I don`t really know, if i can expect being helped by this list - but i think
this question is cygwin specific.
If i'm wrong here and I inconvenience you - sorry - please tell me where/whom to
ask (maybe "alt.comp.programming.linux.rookies" or such ??)
The only thing i had to fix was to add "typedef long long int loff_t;" to
mkcramfs.c because it's not defined in cygwin's types.h.
Surprisingly, it compiled successfully - just with some warnings.
But there is a bug inside: The created filesystem contains "inconsistent"
symlink entries if i unpack them again with uncramfs on a
linux box - i.e. they are garbled.
linux:/tmp/testdir3/base # ls -la
insgesamt 7
drwxr-xr-x 9 vmware bin 251 Apr 26 21:34 .
drwxr-xr-x 67 vmware bin 1653 Apr 26 21:34 ..
drwxr-xr-x 2 vmware bin 883 Apr 26 21:34 bin
drwxr-xr-x 2 vmware bin 75 Apr 26 21:34 dev
drwxr-xr-x 3 vmware bin 532 Apr 26 21:34 etc
drwxr-xr-x 5 vmware bin 459 Apr 26 21:34 lib
lrwxrwxrwx 1 vmware bin 13 Apr 26 21:34 linuxrc -> bin/busybox??
drwxr-xr-x 2 vmware bin 35 Apr 26 21:34 proc
drwxr-xr-x 2 vmware bin 35 Apr 26 21:34 root
lrwxrwxrwx 1 vmware bin 86 Apr 26 21:34 sbin ->
binaÐ??a(u??@v??Xw???y??0z??H{??`|??x}???~??¨???À???Ø???ð???????
???8???drwxr-xr-x 2 vmware bin 35 Apr 26 21:34 tmp
lrwxrwxrwx 1 vmware bin 49 Apr 26 21:34 usr ->
tmpaè??aee//base/tmp/ion-0.8\pkg-tree\base\root\8
lrwxrwxrwx 1 vmware bin 8 Apr 26 21:34 var -> tmp/vara
I think this maybe a result of the compile warning
$ make
gcc -Wall -O3 mkcramfs.c -lz -o mkcramfs
mkcramfs.c: In function `parse_directory':
mkcramfs.c:177: warning: passing arg 4 of `scandir' from incompatible pointer
type
mkcramfs.c: In function `main':
mkcramfs.c:750: warning: int format, ssize_t arg (arg 2)
mkcramfs.c:757: warning: int format, ssize_t arg (arg 2)
mkcramfs.c:771: warning: int format, ssize_t arg (arg 4)
mkcramfs.c:781: warning: int format, ssize_t arg (arg 3)
mkcramfs.c:781: warning: int format, ssize_t arg (arg 4)
I think, the warnings for Lines 750 - 781 don't matter at all and can be
ignored, because it's just printf's/fprintf(stderr,....)'s
but what about this one :
mkcramfs.c:177: warning: passing arg 4 of `scandir' from incompatible pointer
type
?????
Line 177 is:
/* read in the directory and sort */
dircount = scandir(name, &dirlist, 0, cramsort);
I searched for scandir and found the declaration - but I have no clue, what this
means and how to interpret that.
Why does the error happen only with symlinks and not with normal files ?
sadly,I'm on war with pointers and all that stuff - last programming i did was
shell and some java....
(hey, i'm systems administrator - not programmer ;)))
Could someone please(please!) point me to some docs or give me some advice, how
to fix this problem ?
It will cost me weeks to find out, by myself, i think.....
cygwin:
int scandir (const char *__dir,
struct dirent ***__namelist,
int (*select) (const struct dirent *),
int (*compar) (const struct dirent **,const struct dirent **));
i compared that to my linux box:
linux:
extern int scandir (__const char *__restrict __dir,
struct dirent ***__restrict __namelist,
int (*__selector) (__const struct dirent *),
int (*__cmp) (__const void *, __const void *)) __THROW;
looks a little bit different.....
Thanks in advance 4 helping and best regards
Roland
References:
mkcramfs & sources: http://home.austarnet.com.au/paul1/vr/mkcramfs249.tar.gz
uncramfs & sources: http://agenda.fatcathk.com/romdisk/uncramfs-0.6.tar.gz
AUTHOR 1: I hear if you play the NT 4.0 CD backwards, you get a Satanic message.
AUTHOR 2: That's nothing. If you play it forward, it installs NT 4.0.
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