Date: Mon, 11 Mar 2002 14:13:16 +0200 From: "Viktors Krebss" <victor@smc.lv> To: <questions@FreeBSD.org> Subject: Advanced FreeBSD programming question Message-ID: <000e01c1c8f6$1fd928c0$687b02c3@viktors>
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[-- Attachment #1 --] Hello. I have a question for a freebsd C/C++ developer guru, I guess. Recently I've moved from Linux to Freebsd. I have noticed that some of my C programs behave different, even quite simple ones ,100% POSIX / ANSI and working with very simple types ( no sockets, no devices, signals or anything like that ). Looks like it has a bit different memory management or I'm just missing some compiler or linker option. For instance: Let's say I have two shared libraries libA.so and libB.so . A has function x(), and pointer to that function *x, B - y() and *y . All of them are global. Than, at runtime A has to load B . B is assigning y to x. In Linux and WINNT it works fine. But not in freebsd, although there are no warnings from gcc ( with -Wall option ). When B is loaded ,x , in B context, always is 0 and nothing can affect x in A context from B. However, in case when A compiled as executable and B as shared library it woks fine for freebsd to. i686 ( celeron ) , FreeBSD 4.3 , gcc. Best regards, Viktors Krebss, victor@smc.lv SMC , http://www.smc.lv/ tel: +371-7777750, mob: +371-9243923, fax: +371-7777746 [-- Attachment #2 --] <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 5.50.4913.1100" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2><FONT face="Times New Roman" size=3> </FONT> Hello.</FONT></DIV> <DIV><FONT face=Arial size=2><FONT face="Times New Roman" size=3> </FONT></FONT></DIV> <DIV><FONT face=Arial size=2>I have a question for a freebsd C/C++ developer guru, I guess. </DIV> <P class=MsoNormal>Recently I’ve moved from Linux to Freebsd. I have noticed</P> <P class=MsoNormal>that some of my C programs behave different, even quite simple ones</P> <P class=MsoNormal>,100% POSIX / ANSI and working with very simple types ( no sockets, no </P> <P class=MsoNormal>devices, signals or anything like that ). </P> <P class=MsoNormal>Looks like it has a bit different memory management or I’m just missing </P> <P class=MsoNormal>some compiler or linker option. </P> <P class=MsoNormal>For instance:</P> <P class=MsoNormal>Let’s say I have two shared libraries libA.so and libB.so .</P> <P class=MsoNormal>A has function x(), and pointer to that function *x,</P> <P class=MsoNormal>B – y() and *y . All of them are global.</P> <P class=MsoNormal>Than, at runtime A has to load B . B is assigning y to x.</P> <P class=MsoNormal>In Linux and WINNT it works fine. But not in freebsd, although there</P> <P class=MsoNormal>are no warnings from gcc ( with -Wall option ). </P> <P class=MsoNormal>When B is loaded ,x , in B context, always is 0 and nothing</P> <P class=MsoNormal>can affect<SPAN style="mso-spacerun: yes"> </SPAN>x in A context from B.</P> <P class=MsoNormal>However, in case when A compiled as executable and B as shared</P> <P class=MsoNormal>library it woks fine for freebsd to.<SPAN style="mso-spacerun: yes"> </SPAN></P> <P class=MsoNormal>i686 ( celeron ) , FreeBSD 4.3 , gcc.</P></FONT> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Best regards,<BR>Viktors Krebss, <A href="mailto:victor@smc.lv">victor@smc.lv</A><BR>SMC , <A href="http://www.smc.lv/">http://www.smc.lv/</A><BR>tel: +371-7777750, mob: +371-9243923, fax: +371-7777746<BR></FONT></DIV></BODY></HTML>
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