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Re: [CentOS] Strange C programming problem
by fredex 14 Jul '07

14 Jul '07

On Sat, Jul 14, 2007 at 12:52:09PM -0400, Michael Velez wrote: > > > > > I've got this little program I wrote to test something, and > > it keeps giving the wrong result. I'm not inexperienced in C, > > but I can't believe strtof (et al) are broken, so I must be > > doing something wrong. However, I've spent hours looking at > > this and comparing it to the man pages and don't see what I'm > > doing wrong. strtod() and strtold() also give equally wrong > > results. (the example program given on the strotd man page > > works fine, BTW.) > > > > Can someone wield a clue-bat please? :) > > > > Here's the program: > > > > #include <stdio.h> > > #include <math.h> > > #include <stdlib.h> > > #include <errno.h> > > > > int main (int argc, char ** argv) > > { > > float ldbl = 0.0; > > char * endp; > > > > printf ("%s\n", argv[1]); > > > > errno = 0; > > ldbl = strtof (argv[1], &endp); > > if (errno != 0) > > printf ("strtof failed! errno=%d\n", errno); > > > > printf ("%f\n", (double) ldbl); > > printf ("%f\n", (double) strtof (argv[1], (char **)NULL)); > > printf ("%f\n", (double) atof (argv[1])); > > > > return 0; > > } > > > > Compile it with: > > > > cc -O0 -g -o x4 x4.c > > > > then run it like this: > > > > ./x4 2.5 > > > > and I'd EXPECT it to produce this output: > > > > 2.5 > > 2.5 > > 2.5 > > 2.5 > > > > but it actually produces this: > > > > 2.5 > > 1075838976.000000 > > 1075838976.000000 > > 2.500000 > > > > the typecase of the arg in the 3 printf calls makes no > > difference. Remove it and the results are the same. > > > > Using an input of something other than 2.5 changes the middle > > two lines in some way in which I haven't yet discerned a > > pattern, but the result is still highly bogus. > > > > The following strtod line works fine on my system (CentOS 5, latest updates, > x86_64): > > printf ("%lf\n", (double) strtod (argv[1], (char **)NULL)); > > For strtof, the SYNOPSIS in the man page mentions you need to add: > > #define _ISO_C99_SOURCE > > Or > > #define _XOPEN_SOURCE 600 > > Either line should be added before ALL include files (note there is a > mistake in the synopsis. There should be no = sign in the define statement > for _XOPEN_SOURCE). > > The above #define lines enforces C99 compatibility rules, which is the > revised ISO C standard which came out in 1999. As a previous responder > suggested, you can also specify -std=gnu99 or -std=C99 on the compile line. > > Michael Sorry, I forgot to mention that I'm using Centos 4.5. And the man page here doesn't mention those #define settings. I'll give it a try, thanks! -- ------------------------------------------------------------------------------- .---- Fred Smith / ( /__ ,__. __ __ / __ : / / / / /__) / / /__) .+' Home: fredex(a)fcshome.stoneham.ma.us / / (__ (___ (__(_ (___ / :__ 781-438-5471 -------------------------------- Jude 1:24,25 ---------------------------------

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Fedora Revisor with CentOS 5 Support
by Matt Martz 14 Jul '07

14 Jul '07

Looks like Fedora released a new version of Revisor, 2.0.4.1-2, (Custom Live CD Generator) that includes support for generating CentOS5 live cds. Just thought someone might like to know. Cheers! -- Matt Martz mdmartz(a)sivel.net CentOS Mirror Admin

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Strange C programming problem
by fredex 14 Jul '07

14 Jul '07

I've got this little program I wrote to test something, and it keeps giving the wrong result. I'm not inexperienced in C, but I can't believe strtof (et al) are broken, so I must be doing something wrong. However, I've spent hours looking at this and comparing it to the man pages and don't see what I'm doing wrong. strtod() and strtold() also give equally wrong results. (the example program given on the strotd man page works fine, BTW.) Can someone wield a clue-bat please? :) Here's the program: #include <stdio.h> #include <math.h> #include <stdlib.h> #include <errno.h> int main (int argc, char ** argv) { float ldbl = 0.0; char * endp; printf ("%s\n", argv[1]); errno = 0; ldbl = strtof (argv[1], &endp); if (errno != 0) printf ("strtof failed! errno=%d\n", errno); printf ("%f\n", (double) ldbl); printf ("%f\n", (double) strtof (argv[1], (char **)NULL)); printf ("%f\n", (double) atof (argv[1])); return 0; } Compile it with: cc -O0 -g -o x4 x4.c then run it like this: ./x4 2.5 and I'd EXPECT it to produce this output: 2.5 2.5 2.5 2.5 but it actually produces this: 2.5 1075838976.000000 1075838976.000000 2.500000 the typecase of the arg in the 3 printf calls makes no difference. Remove it and the results are the same. Using an input of something other than 2.5 changes the middle two lines in some way in which I haven't yet discerned a pattern, but the result is still highly bogus. Thanks! -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- "And he will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace. Of the increase of his government there will be no end. He will reign on David's throne and over his kingdom, establishing and upholding it with justice and righteousness from that time on and forever." ------------------------------- Isaiah 9:7 (niv) ------------------------------

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Re: [CentOS] Newbie ADSL configuration, ppp0 can't activate &
by mailing-lists＠computer2.com 14 Jul '07

14 Jul '07

>Message: 23 >Date: Fri, 13 Jul 2007 22:11:59 -0400 >From: Dan Halbert <halbert(a)everyzing.com> >Subject: Re: [CentOS] Newbie ADSL configuration, ppp0 can't activate & > config not found >To: CentOS mailing list <centos(a)centos.org> >Message-ID: <469830EF.3080601(a)everyzing.com> mailing-lists(a)computer2.com wrote: <snip> If you have a router, then the ADSL connection you have is handled by the router, and is invisible to you, on the LAN side of the router. The router could be connecting to the WAN via a piece of wet string, as far as you care. So you should just have eth0 do DHCP and leave it connected to the router. You'll get an address like 192.168.1.2 from the router. You don't need ppp0 at all; to Centos the router appears like a LAN that routes to the Internet. In Windows, do "ipconfig" in a Command window, and you'll see what I mean. You should see something similar with ifconfig in Centos. Dan: Thank you for replying! I will try what you suggested, ASAP. Yesterday was Friday the 13th.... I need to get this working, before I try to get my Firewall/Router working! Lanny

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Live CD root password
by Mogens Kjaer 14 Jul '07

14 Jul '07

Does the root user on the CentOS 5 live CD have a password? If so, which? su and sudo asks for a password, it is neither empty, root nor centos. Mogens -- Mogens Kjaer, Carlsberg A/S, Computer Department Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark Phone: +45 33 27 53 25, Fax: +45 33 27 47 08 Email: mk(a)crc.dk Homepage: http://www.crc.dk

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PHP doesn't connect to PG with SELinux
by Martin Marques 14 Jul '07

14 Jul '07

I just migrated my FC4 server to CentOS 5 and had some problems with DB connections from PHP to a PG server (remote server). The thing is that I couldn't get an error, until I disabled SELinux. At that time, the PG connections started working. Are there any instructions on how to work with SELinux enabled and multiple applications connecting one with another? -- select 'mmarques' || '@' || 'unl.edu.ar' AS email; --------------------------------------------------------- Martín Marqués | Programador, DBA Centro de Telemática | Administrador Universidad Nacional del Litoral ---------------------------------------------------------

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CentOS-announce Digest, Vol 29, Issue 6
by centos-announce-request＠centos.org 14 Jul '07

14 Jul '07

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CESA-2007:0662 Moderate CentOS 3 s390(x) httpd - security update (Pasi Pirhonen) ---------------------------------------------------------------------- Message: 1 Date: Fri, 13 Jul 2007 17:01:53 +0300 From: Pasi Pirhonen <upi(a)centos.fi> Subject: [CentOS-announce] CESA-2007:0662 Moderate CentOS 3 s390(x) httpd - security update To: centos-announce(a)centos.org Message-ID: <20070713140153.GF28734(a)centos.fi> Content-Type: text/plain; charset="us-ascii" CentOS Errata and Security Advisory 2007:0662 https://rhn.redhat.com/errata/RHSA-2007-0662.html The following updated files have been uploaded and are currently syncing to the mirrors: s390: updates/s390/RPMS/httpd-2.0.46-68.ent.centos.s390.rpm updates/s390/RPMS/httpd-devel-2.0.46-68.ent.centos.s390.rpm updates/s390/RPMS/mod_ssl-2.0.46-68.ent.centos.s390.rpm s390x: updates/s390x/RPMS/httpd-2.0.46-68.ent.centos.s390x.rpm updates/s390x/RPMS/httpd-devel-2.0.46-68.ent.centos.s390x.rpm updates/s390x/RPMS/mod_ssl-2.0.46-68.ent.centos.s390x.rpm -- Pasi Pirhonen - upi(a)iki.fi - http://pasi.pirhonen.eu/ Top-postings silently ignored

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Newbie ADSL configuration, ppp0 can't activate & config not found
by mailing-lists＠computer2.com 14 Jul '07

14 Jul '07

I am frustrated. This is a dual boot box, Win XP (Spanish) and CentOS 4.4. The phone company man came today and installed ADSL to the WinXP side and that works fine. I can't get the box online, while in CentOS 4.4. The ADSL router has a fixed IP address (192.168.1.1) and he configured it to get the IP from the ISP via DHCP and get the DNS servers automatically. When I try that on CentOS (which is what I use 99% of the time), it doesn't connect. In the Network Configuration for eth0, things seem OK, but the configuration for xDSL, ppp0, probably needs something I do not have in it and it won't activate. Questions: (a) should I have network configurations for both eth0 and ppp0? I've tried it with both and only with ppp0. (b) is there a possibility that the NIC, which is integrated onto the motherboard and has always worked fine on our home LAN, as eth0, won't work properly as ppp0? If so, should I disable it and install a NIC in the box? I've looked in the RHEL Step by Step Guide for RHEL 4 and Systems Administrators Guides, but they don't seem to cover this issue. Any links to a step by step how to, to do something I believe is simple, but, where I'm missing something, will be greatly appreciated! TIA, Lanny

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PHP 5.2
by John Thomas 13 Jul '07

13 Jul '07

To me, there seems to be growing support to requiring PHP 5.2 within the next year, see http://www.gophp5.org/ . Does anyone know of plans to release PHP 5.2 RPMS in any of the major repos? -- Sincerely, John Thomas

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Re: [CentOS] dumb sendmail question -- how to get outbound messages to use "example.com" instead of hostname?
by Brent L. Bates 13 Jul '07

13 Jul '07

Since you are using NAT, the important IP address and host name associated with it is the one the outside world sees. Does that IP address have a host name the world sees and does that name then resolve to the same IP address? -- Brent L. Bates (UNIX Sys. Admin.) M.S. 912 Phone:(757) 865-1400, x204 NASA Langley Research Center FAX:(757) 865-8177 Hampton, Virginia 23681-0001 Email: B.L.BATES(a)larc.nasa.gov http://www.vigyan.com/~blbates/

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