LFS-hint for strace-4.2

Philipp Niemann phil at ifm-bonn.org
Tue Jan 30 07:14:55 PST 2001


Good afternoon to you!

Here is my first LFS-hint. Jesse Tie Ten Quee invited
me on #lfs to send it to your list. It is about strace-4.2.

Please keep in mind that I am not subscribed to lfs-apps.
The best way to send feedback on this would be to
mail "niemann at ifm-bonn.org". That should work.
(Or try and catch me on #lfs ;-))

Sorry for the inconvenience, I have no proper mailaccount
setup yet. no sendmail, no exim or what ever.
    
The fromaddress on this mail is not valid!
Please don't use it. 

++++ Beginning of hint ++++
# Installation of strace-4.2
#
# System was a linux-2.4.0 based Linux from Scratch
# with glibc-2.2.1 and gcc-2.95.3-test2
#
# Philipp Niemann (niemann at ifm-bonn.org)
# send to lfs-apps at linuxfromscratch.org

strace is a program useful for debugging or tutorial purposes. You can
trace systemcalls and signals of programs.

>From the manpage:
    In the simplest case strace runs the specified command until it
    exits.  It intercepts and records the system calls  which are
    called by a process and the signals which are received by a process.
    The name of each system call, its arguments and its return value
    are printed on standard error or to the file specified with the
    -o option.

So this is a useful program.

You can get the source from
    http://www.wi.leidenuniv.nl/~wichert/strace/strace-4.2.tar.gz
    Homepage is: http://www.wi.leidenuniv.nl/~wichert/strace/

If you want to use that stuff you have to untar it first:

    tar xzvf strace-4.2.tar.gz

Now for the compile-thingie:
    cd strace-4.2.tar.gz
    configure --prefix=/usr/local   # One could add more --options but
                    # the Makefile doesn't honor that
    make
    make install

Not to much. But in my case there occured some errors. So I have made a
patch to circumvent those pits. Here it comes:

--------------------------------------------------------
Snip just below the next line of dashes
--------------------------------------------------------
diff -Naur strace-4.2/file.c strace-4.2-done2/file.c
--- strace-4.2/file.c   Tue Jan 11 14:41:10 2000
+++ strace-4.2-done2/file.c Fri Jan 19 10:03:22 2001
@@ -34,9 +34,11 @@

 #include <dirent.h>
 #ifdef linux
-#define dirent kernel_dirent
 #include <linux/types.h>
+#define dirent kernel_dirent
+#define dirent64 kernel_dirent64
 #include <linux/dirent.h>
+#undef dirent64
 #undef dirent
 #else
 #define kernel_dirent dirent
@@ -611,7 +613,7 @@
    realprintstat(tcp, &statbuf);
 }

-#ifdef STAT64
+#ifdef HAVE_STAT64
 static void
 printstat64(tcp, addr)
 struct tcb *tcp;
diff -Naur strace-4.2/stream.c strace-4.2-done2/stream.c
--- strace-4.2/stream.c Thu Dec 23 14:20:15 1999
+++ strace-4.2-done2/stream.c   Fri Jan 19 10:06:29 2001
@@ -34,13 +34,16 @@

 #if defined(linux)
 #include <sys/poll.h>
+#include <stropts.h>

+#ifdef linux2
 #define RS_HIPRI 1
 struct strbuf {
         int     maxlen;                 /* no. of bytes in buffer */
         int     len;                    /* no. of bytes returned */
         char    *buf;                   /* pointer to data */
 };
+#endif /* linux2 */
 #define MORECTL 1
 #define MOREDATA 2
--------------------------------------------------------
End of patch. Snip just above previous line of dashes
--------------------------------------------------------

With that patch strace did compile on my machine. You would cut and paste
the above patch to a new file which I call patchfile for now. Then issue
the following command in the directory where the tar-command was executed:
    patch -p0 < patchfile
And you should get output about two files being patches.

Beware, I am not a programmer. So it is absolutly possible that this patch
only 'works' to get rid of the compile-errors and on the other side breaks
the logic of the program. Use caution.

++++ End of hint ++++

Greetings and have fun,
Philipp Niemann

PS: You can find this patch and the hint on
http://www.azagtoth.de/lfs.html also. As well as some other
nonsense ;-)

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