GNU TAR vs NATIVE AIX TAR Post: 302975619

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Operating Systems AIX GNU TAR vs NATIVE AIX TAR Post 302975619 by bakunin on Thursday 16th of June 2016 05:56:27 AM

06-16-2016

Registered User

Quote:

Originally Posted by filosophizer

What could be the problem / issue ?

Taking the other threads you opened into account which all seem to pertain to the same problem it is quite clear: your system is - for unknown reasons (probably some problem during package installation, but not enough data to verify that) - missing some of the shared libraries the GNU-tar binary relies on. This is why it can't do what it is supposed to do and this is why it can't process your tar-file.

It works like this: GNU-tar calls upon a function "somefunction()", but doesn't contain the code for it. Instead it relies on this code being stored somewhere else on the system (a so-called "shared library", because such files usually contain not only the code for this one but for many such functions). The normal proceedings would now be for tar to load the code representing this function from the library and then execute it. But somehow, in your case, it can't - and because this "somefunction()" is vital to the function of tar - it doesn't get done anything.

So far the general analysis of your problem. Now we need to find out what exactly is holding tar from loading the code for the function from the shared lib. There are several possible reasons:

1 - tar doesn't know where the lib is: any program is guided to the place where it can find the libraries it needs by the variable "LIBPATH" and/or "LD_LIBRARY_PATH". The format is the same as the PATH variable: a list of directories separated by a colon: /some/dir1:/some/dir2:.....

2 - tar can't read the library: maybe the user tar is started with isn't allowed to read the library - check and make sure the "r"-flag is set for world for shared libraries.

3 - The library is really missing: in this case you need to install it somehow. tar itself doesn't care how the library gets there, so install a package or even just copy the file (for test purposes! You don't want that to be a lasting state.) All this means you have to find out which libaries are missing.

I hope this helps.

bakunin

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th_get_size

th_get_pathname(3)						  C Library Calls						th_get_pathname(3)

NAME

       th_get_pathname,   th_get_uid,	th_get_gid,   th_get_mode,   th_get_crc,   th_get_size,  th_get_mtime,	th_get_devmajor,  th_get_devminor,
       th_get_linkname - extract individual fields of a tar header

       TH_ISREG, TH_ISLNK, TH_ISSYM, TH_ISCHR, TH_ISBLK, TH_ISDIR, TH_ISFIFO - determine what kind of file a tar header refers to

       TH_ISLONGNAME, TH_ISLONGLINK - determine whether the GNU extensions are in use

SYNOPSIS

       #include <libtar.h>

       char *th_get_linkname(TAR *t);

       char *th_get_pathname(TAR *t);

       mode_t th_get_mode(TAR *t);

       uid_t th_get_uid(TAR *t);

       gid_t th_get_gid(TAR *t);

       int th_get_crc(TAR *t);

       off_t th_get_size(TAR *t);

       time_t th_get_mtime(TAR *t);

       major_t th_get_devmajor(TAR *t);

       minor_t th_get_devminor(TAR *t);

       int TH_ISREG(TAR *t);

       int TH_ISLNK(TAR *t);

       int TH_ISSYM(TAR *t);

       int TH_ISCHR(TAR *t);

       int TH_ISBLK(TAR *t);

       int TH_ISDIR(TAR *t);

       int TH_ISFIFO(TAR *t);

       int TH_ISLONGNAME(TAR *t);

       int TH_ISLONGLINK(TAR *t);

VERSION

       This man page documents version 1.2 of libtar.

DESCRIPTION

       The th_get_*() functions extract individual fields from the current tar header associated with the TAR handle t.

       The TH_IS*() macros are used to evaluate what kind of file is pointed to by the current tar header associated with the TAR handle t.

       The TH_ISLONGNAME() and TH_ISLONGLINK() macros evaluate whether or not the GNU extensions are used by the  current  tar	header	associated
       with the TAR handle t.  This is only relevant if the TAR_GNU option was used when tar_open() was called.

SEE ALSO

       tar_open(3)

University of Illinois						     Jan 2001							th_get_pathname(3)