Re: compiling FreeBSD date on Linux

[Polytropon]

Te strlcpy function is part of the system's C library, libc.
It is declared in string.h. Did you

#include 

and check if the Linux C library has this function included?
If it has, "man strlcpy" should mention it. Oh wait, when
talking about Linux, it's possible that there is no manpage
for this library function.

The *l* string functions have been introduced in OpenBSD
and FreeBSD to get rid of "overflow problems" when using
strcpy and strcat, because they take a length parameter,
which is size_t size.

These are their signatures:

size_t strlcpy(char *dst, const char *src, size_t size);
size_t strlcat(char *dst, const char *src, size_t size);

Check if Linux has them, too, and if yes, that they have
the same parameter definition.



-- 
Polytropon
>From Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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Re: compiling FreeBSD date on Linux

[Roland Smith]

On Sat, May 23, 2009 at 05:00:08PM -0300, francis keyes wrote:
>  I added "#include " to date .c but still get some errors:
> 
>  date.c: In function *setthetime*:
>  date.c:192: warning: assignment makes pointer from integer without a cast
>  /tmp/ccZTmvsY.o: In function `netsettime':
>  netdate.c:(.text+0x1f1): undefined reference to `strlcpy'
>  collect2: ld returned 1 exit status

Try replacing strlcpy with strncpy. The latter is standard C, although
somewhat less safe.

Roland
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Re: compiling FreeBSD date on Linux

[francis keyes]

I added "#include " to date .c but still get some errors:

date.c: In function ‘setthetime’:
date.c:192: warning: assignment makes pointer from integer without a cast
/tmp/ccZTmvsY.o: In function `netsettime':
netdate.c:(.text+0x1f1): undefined reference to `strlcpy'
collect2: ld returned 1 exit status

I tried downloading the source to strlcpy and compiling with everything
else:
gcc -o date date.c netdate.c vary.c strlcpy.c

It compiles now with the warning:
date.c: In function ‘setthetime’:
date.c:192: warning: assignment makes pointer from integer without a cast


... but it doesn't work.  The output of "./date" is:

%+


I'm going to keep playling with it...


On Fri, May 22, 2009 at 4:58 AM, Roland Smith  wrote:

> On Thu, May 21, 2009 at 09:08:31PM -0300, francis keyes wrote:
> >  I patched date.c and tried to compile but I get a few errors, as you
> suspected:
> >
> >  In file included from date.c:59:
> >  vary.h:35: warning: *struct tm* declared inside parameter list
> >  vary.h:35: warning: its scope is only this definition or declaration,
> which is probably not what
> >  you want
> >  date.c: In function *main*:
> >  date.c:85: error: storage size of *lt* isn*t known
>
> Add "#include " to date.c.
>
> Roland
> --
> R.F.Smith   
> http://www.xs4all.nl/~rsmith/
> [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated]
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Re: compiling FreeBSD date on Linux

[Roland Smith]

On Thu, May 21, 2009 at 09:08:31PM -0300, francis keyes wrote:
>  I patched date.c and tried to compile but I get a few errors, as you 
> suspected:
> 
>  In file included from date.c:59:
>  vary.h:35: warning: *struct tm* declared inside parameter list
>  vary.h:35: warning: its scope is only this definition or declaration, which 
> is probably not what
>  you want
>  date.c: In function *main*:
>  date.c:85: error: storage size of *lt* isn*t known

Add "#include " to date.c.

Roland
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Re: compiling FreeBSD date on Linux

[francis keyes]

I patched date.c and tried to compile but I get a few errors, as you
suspected:

In file included from date.c:59:
vary.h:35: warning: ‘struct tm’ declared inside parameter list
vary.h:35: warning: its scope is only this definition or declaration, which
is probably not what you want
date.c: In function ‘main’:
date.c:85: error: storage size of ‘lt’ isn’t known
date.c:163: error: invalid type argument of ‘unary *’ (have ‘int’)
date.c:172: warning: incompatible implicit declaration of built-in function
‘strftime’
date.c: In function ‘setthetime’:
date.c:190: warning: assignment makes pointer from integer without a cast
date.c:191: warning: assignment makes pointer from integer without a cast
date.c:211: warning: assignment makes pointer from integer without a cast
date.c:217: error: dereferencing pointer to incomplete type
date.c:218: error: dereferencing pointer to incomplete type
date.c:221: error: dereferencing pointer to incomplete type
date.c:227: error: dereferencing pointer to incomplete type
date.c:232: error: dereferencing pointer to incomplete type
date.c:234: error: dereferencing pointer to incomplete type
date.c:235: error: dereferencing pointer to incomplete type
date.c:236: error: dereferencing pointer to incomplete type
date.c:238: error: dereferencing pointer to incomplete type
date.c:242: error: dereferencing pointer to incomplete type
date.c:243: error: dereferencing pointer to incomplete type
date.c:245: error: dereferencing pointer to incomplete type
date.c:248: error: dereferencing pointer to incomplete type
date.c:249: error: dereferencing pointer to incomplete type
date.c:253: error: dereferencing pointer to incomplete type
date.c:254: error: dereferencing pointer to incomplete type
date.c:258: error: dereferencing pointer to incomplete type
date.c:259: error: dereferencing pointer to incomplete type
date.c:268: error: dereferencing pointer to incomplete type


On Wed, May 20, 2009 at 4:20 PM, Roland Smith  wrote:

> On Wed, May 20, 2009 at 02:45:59PM -0300, francis keyes wrote:
> > Hmm... the date program looks pretty simple but I don't understand the
> > Makfile:
> >
> > #@(#)Makefile8.1 (Berkeley) 5/31/93
> > # $FreeBSD: src/bin/date/Makefile,v 1.11.30.1 2009/04/15 03:14:26
> kensmith
> > Exp $
> >
> > PROG=date
> > SRCS=date.c netdate.c vary.c
> > DPADD=${LIBUTIL}
> > LDADD=-lutil
> >
> > .include 
> >
> >
> > Would it be possible to compile this without a makefile?
>
> Sure. A command like "gcc -o date date.c netdate.c vary.c" works,
> provided you patch date.c to remove the dependency on libutil (logwtmp
> function). This will stop date from logging to wtmp(5).
>
> - patch for date.c -
> --- date.c.orig 2009-05-04 22:09:01.0 +0200
> +++ date.c  2009-05-20 21:05:32.0 +0200
> @@ -48,7 +48,7 @@
>  #include 
>  #include 
>  #include 
> -#include 
> +/*#include */
>  #include 
>  #include 
>  #include 
> @@ -274,12 +274,12 @@
>if (!jflag) {
>/* set the time */
>if (nflag || netsettime(tval)) {
> -   logwtmp("|", "date", "");
> +   /*logwtmp("|", "date", "");*/
>tv.tv_sec = tval;
>tv.tv_usec = 0;
>if (settimeofday(&tv, (struct timezone *)NULL))
>err(1, "settimeofday (timeval)");
> -   logwtmp("{", "date", "");
> +   /*logwtmp("{", "date", "");*/
>}
>
>if ((p = getlogin()) == NULL)
> - patch for date.c -
>
> With this patch, the executable only depends on libc.
>
> Note that I have only confirmed that it compiles _on FreeBSD_. There
> might be additional differences between FreeBSD libc and the GNU libc
> that is used on Linux that make further tinkering with the source
> necessary.
>
> Roland
> --
> R.F.Smith   
> http://www.xs4all.nl/~rsmith/
> [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated]
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>
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Re: compiling FreeBSD date on Linux

[Giorgos Keramidas]

On Wed, 20 May 2009 14:45:59 -0300, francis keyes  wrote:
> Hmm... the date program looks pretty simple but I don't understand the
> Makfile:
>
> #@(#)Makefile8.1 (Berkeley) 5/31/93
> # $FreeBSD: src/bin/date/Makefile,v 1.11.30.1 2009/04/15 03:14:26 kensmith
> Exp $
>
> PROG=date
> SRCS=date.c netdate.c vary.c
> DPADD=${LIBUTIL}
> LDADD=-lutil
>
> .include 
>
> Would it be possible to compile this without a makefile?

Yes, but you will also need bits of code from libutil.  If you have all
the necessary bits in a new file, i.e. util.c, then you should be able
to use:

cc -o date date.c netdate.c vary.c util.c

Extracting the minimal parts of libutil and writing the new util.c file
is an interesting and amusing exercise for a budding C programmer, but
it should be both possible and relatively ``easy''.

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Re: compiling FreeBSD date on Linux

[Mel Flynn]

#warning "Pedantic mode on"
#define TOPIC "BSD build system tricks"

On Wednesday 20 May 2009 21:57:02 Polytropon wrote:

> > DPADD=${LIBUTIL}
>
> Needs to compile what ${LIBUTIL} point to, usually the
> libutil directory in the src/ tree.

This is the actual build dependency and the var is defined in bsd.libnames.mk.

>
> > LDADD=-lutil
>
> Additional info for the linker: link against libutil.
> This indicates that libutil is a build dependency for
> the date program.

It's a linker statement, while it's logical that libutil has to be built 
before it can be linked against, this does in fact not have to be the same 
libutil, so what this line really cares about is that libutil.so or libutil.a 
is resolvable via the various linker rules.

One can in fact do:
LDFLAGS=-L/usr/local/lib
LDADD=${LIBUTIL} -lutil

This will link the static libutil from bsd.libnames.mk and then try to link 
with /usr/local/lib/libutil.so, before looking elsewhere.

-- 
Mel
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Re: compiling FreeBSD date on Linux

[Polytropon]

On Wed, 20 May 2009 14:45:59 -0300, francis keyes  wrote:
> Hmm... the date program looks pretty simple but I don't understand the
> Makfile:
> 
> #@(#)Makefile8.1 (Berkeley) 5/31/93
> # $FreeBSD: src/bin/date/Makefile,v 1.11.30.1 2009/04/15 03:14:26 kensmith
> Exp $
> 
> PROG=date

The final program name.



> SRCS=date.c netdate.c vary.c

The source files it depends on.



> DPADD=${LIBUTIL}

Needs to compile what ${LIBUTIL} point to, usually the
libutil directory in the src/ tree.



> LDADD=-lutil

Additional info for the linker: link against libutil.
This indicates that libutil is a build dependency for
the date program.



> .include 

Definitions, variables and "what to do" is there.



> Would it be possible to compile this without a makefile?

That was my initial idea. The date program seems to depend
on two things: First the kernel interface which would be
something similar in Linux, and the libutil library, which
is maybe present on Linux, too.




-- 
Polytropon
>From Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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Re: compiling FreeBSD date on Linux

[Mel Flynn]

On Wednesday 20 May 2009 19:45:59 francis keyes wrote:
> Hmm... the date program looks pretty simple but I don't understand the
> Makfile:
>
> #@(#)Makefile8.1 (Berkeley) 5/31/93
> # $FreeBSD: src/bin/date/Makefile,v 1.11.30.1 2009/04/15 03:14:26 kensmith
> Exp $
>
> PROG=date
> SRCS=date.c netdate.c vary.c
> DPADD=${LIBUTIL}
> LDADD=-lutil
>
> .include 
>
>
> Would it be possible to compile this without a makefile?

This is because the under appreciated FreeBSD make system does a *lot* of work 
for you.

- You need libutil: /usr/src/lib/libutil or (probably faster), see which 
functions from libutil date uses and re-implement them.
- Resolve header issues in the above source files
- And then it's most likely easiest to use cmake or autotools on linux to 
compile.

-- 
Mel
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Re: compiling FreeBSD date on Linux

[Roland Smith]

On Wed, May 20, 2009 at 02:45:59PM -0300, francis keyes wrote:
> Hmm... the date program looks pretty simple but I don't understand the
> Makfile:
> 
> #@(#)Makefile8.1 (Berkeley) 5/31/93
> # $FreeBSD: src/bin/date/Makefile,v 1.11.30.1 2009/04/15 03:14:26 kensmith
> Exp $
> 
> PROG=date
> SRCS=date.c netdate.c vary.c
> DPADD=${LIBUTIL}
> LDADD=-lutil
> 
> .include 
> 
> 
> Would it be possible to compile this without a makefile?

Sure. A command like "gcc -o date date.c netdate.c vary.c" works,
provided you patch date.c to remove the dependency on libutil (logwtmp
function). This will stop date from logging to wtmp(5).

- patch for date.c -
--- date.c.orig 2009-05-04 22:09:01.0 +0200
+++ date.c  2009-05-20 21:05:32.0 +0200
@@ -48,7 +48,7 @@
 #include 
 #include 
 #include 
-#include 
+/*#include */
 #include 
 #include 
 #include 
@@ -274,12 +274,12 @@
if (!jflag) {
/* set the time */
if (nflag || netsettime(tval)) {
-   logwtmp("|", "date", "");
+   /*logwtmp("|", "date", "");*/
tv.tv_sec = tval;
tv.tv_usec = 0;
if (settimeofday(&tv, (struct timezone *)NULL))
err(1, "settimeofday (timeval)");
-   logwtmp("{", "date", "");
+   /*logwtmp("{", "date", "");*/
}
 
if ((p = getlogin()) == NULL)
- patch for date.c -

With this patch, the executable only depends on libc.

Note that I have only confirmed that it compiles _on FreeBSD_. There
might be additional differences between FreeBSD libc and the GNU libc
that is used on Linux that make further tinkering with the source necessary.

Roland
-- 
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Re: compiling FreeBSD date on Linux

[francis keyes]

Hmm... the date program looks pretty simple but I don't understand the
Makfile:

#@(#)Makefile8.1 (Berkeley) 5/31/93
# $FreeBSD: src/bin/date/Makefile,v 1.11.30.1 2009/04/15 03:14:26 kensmith
Exp $

PROG=date
SRCS=date.c netdate.c vary.c
DPADD=${LIBUTIL}
LDADD=-lutil

.include 


Would it be possible to compile this without a makefile?


On Tue, May 19, 2009 at 9:38 PM, Chuck Robey  wrote:

> Polytropon wrote:
> > On Tue, 19 May 2009 18:19:21 -0300, francis keyes 
> wrote:
> >> I would like to compile the FreeBSD date command for use on Linux
> because
> >> the FreeBSD version has some features that are not present in Linux.
> >> I downloaded all the files from
> >> http://www.freebsd.org/cgi/cvsweb.cgi/src/bin/date/ and tried to
> compile it
> >> but I get an error from the Makefile:
> >> Makefile:9: *** missing separator.  Stop.
> >
> > First of all, it seems that it's not that easy. FreeBSD's make
> > is, if I am correct, a different one than the Linux make. It
> > uses - if you look into date's Makefile, an include file,
> > named bsd.prog.mk which is located outside of the date/ directory,
> > this is /usr/share/mk/bsd.prog.mk or /usr/src/share/mk/bsd.prog.mk
> > or /usr/src/tools/build/mk/bsd.prog.mk. You could try to write
> > an own Makefile on Linux, or try to work without one...
> >
> >
> >
> >> I suspect this is the first of many errors I will run into during this
> >> process.  Can anyone help me out with this or tell me if there is an
> easier
> >> way to get this version of the date command running in Linux?
> >
> > I'm not sure, but it's possible that FreeBSD can be used to
> > compile date so it will run on Linux (cross-compier). Because
> > I never tried this, I can't tell you how to achieve this.
> >
> > Furthermore, I'm not sure in how far date hooks into the FreeBSD
> > kernel in order to work. It's completely possible that it would
> > be easier to implement FreeBSD's date functionality in Linux's
> > date command itself ("from scratch").
>
> The code isn't all that hard to port, unless you're at a very basic level
> with
> C.  The compatibility level between the BSD Make (bmake) and the GNU Make
> (gmake) isn't all that great.  One killer problem is that gmake hasn't got
> any
> concept of a single central include directory, for automatically building
> up a
> per machine make environment.  Gmake can do the including (using a protocol
> which is unfortunately different than that of bmake) BUT you can't just
> rely on
> gmake looking into the bmake central directory (/usr/share/mk) for make
> include
> files.  All of those are named like "bsd.port.mk", in that they all begin
> with
> "bsd." and end in ".mk", and there isn't any portability between bmake and
> gmake
> on those include files.  I have personally (in the past) written up a set
> of
> gmake compatible include files, so it CAN be done, but you getter have your
> hard
> hat on, it's not all that simple to do.
>
> The various timing commands in either the bsd libc or the Linux glibc look
> much
> alike, so the porting isn't all that hard, once you conquer the makefiles.
>
> >
>
>
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Re: compiling FreeBSD date on Linux

[Chuck Robey]

Polytropon wrote:
> On Tue, 19 May 2009 18:19:21 -0300, francis keyes  wrote:
>> I would like to compile the FreeBSD date command for use on Linux because
>> the FreeBSD version has some features that are not present in Linux.
>> I downloaded all the files from
>> http://www.freebsd.org/cgi/cvsweb.cgi/src/bin/date/ and tried to compile it
>> but I get an error from the Makefile:
>> Makefile:9: *** missing separator.  Stop.
> 
> First of all, it seems that it's not that easy. FreeBSD's make
> is, if I am correct, a different one than the Linux make. It
> uses - if you look into date's Makefile, an include file,
> named bsd.prog.mk which is located outside of the date/ directory,
> this is /usr/share/mk/bsd.prog.mk or /usr/src/share/mk/bsd.prog.mk
> or /usr/src/tools/build/mk/bsd.prog.mk. You could try to write
> an own Makefile on Linux, or try to work without one...
> 
> 
> 
>> I suspect this is the first of many errors I will run into during this
>> process.  Can anyone help me out with this or tell me if there is an easier
>> way to get this version of the date command running in Linux?
> 
> I'm not sure, but it's possible that FreeBSD can be used to
> compile date so it will run on Linux (cross-compier). Because
> I never tried this, I can't tell you how to achieve this.
> 
> Furthermore, I'm not sure in how far date hooks into the FreeBSD
> kernel in order to work. It's completely possible that it would
> be easier to implement FreeBSD's date functionality in Linux's
> date command itself ("from scratch").

The code isn't all that hard to port, unless you're at a very basic level with
C.  The compatibility level between the BSD Make (bmake) and the GNU Make
(gmake) isn't all that great.  One killer problem is that gmake hasn't got any
concept of a single central include directory, for automatically building up a
per machine make environment.  Gmake can do the including (using a protocol
which is unfortunately different than that of bmake) BUT you can't just rely on
gmake looking into the bmake central directory (/usr/share/mk) for make include
files.  All of those are named like "bsd.port.mk", in that they all begin with
"bsd." and end in ".mk", and there isn't any portability between bmake and gmake
on those include files.  I have personally (in the past) written up a set of
gmake compatible include files, so it CAN be done, but you getter have your hard
hat on, it's not all that simple to do.

The various timing commands in either the bsd libc or the Linux glibc look much
alike, so the porting isn't all that hard, once you conquer the makefiles.

> 

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Re: compiling FreeBSD date on Linux

[Polytropon]

On Tue, 19 May 2009 18:19:21 -0300, francis keyes  wrote:
> I would like to compile the FreeBSD date command for use on Linux because
> the FreeBSD version has some features that are not present in Linux.
> I downloaded all the files from
> http://www.freebsd.org/cgi/cvsweb.cgi/src/bin/date/ and tried to compile it
> but I get an error from the Makefile:
> Makefile:9: *** missing separator.  Stop.

First of all, it seems that it's not that easy. FreeBSD's make
is, if I am correct, a different one than the Linux make. It
uses - if you look into date's Makefile, an include file,
named bsd.prog.mk which is located outside of the date/ directory,
this is /usr/share/mk/bsd.prog.mk or /usr/src/share/mk/bsd.prog.mk
or /usr/src/tools/build/mk/bsd.prog.mk. You could try to write
an own Makefile on Linux, or try to work without one...



> I suspect this is the first of many errors I will run into during this
> process.  Can anyone help me out with this or tell me if there is an easier
> way to get this version of the date command running in Linux?

I'm not sure, but it's possible that FreeBSD can be used to
compile date so it will run on Linux (cross-compier). Because
I never tried this, I can't tell you how to achieve this.

Furthermore, I'm not sure in how far date hooks into the FreeBSD
kernel in order to work. It's completely possible that it would
be easier to implement FreeBSD's date functionality in Linux's
date command itself ("from scratch").

-- 
Polytropon
>From Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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compiling FreeBSD date on Linux

[francis keyes]

I would like to compile the FreeBSD date command for use on Linux because
the FreeBSD version has some features that are not present in Linux.
I downloaded all the files from
http://www.freebsd.org/cgi/cvsweb.cgi/src/bin/date/ and tried to compile it
but I get an error from the Makefile:
Makefile:9: *** missing separator.  Stop.

I suspect this is the first of many errors I will run into during this
process.  Can anyone help me out with this or tell me if there is an easier
way to get this version of the date command running in Linux?

Thanks a lot,
Francis
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