April 2005 - openSUSE Programming - openSUSE Mailing Lists

RE: [suse-programming-e] Programming standards!
by Hallingstad Håkon 15 Apr '05

15 Apr '05

> Dozens of different kinds of hardware are probed - which might or might not be > available, thus requiring some (frequently heuristic) hardware probing - and > waiting for answers for some time. Some hardware subsystems have looong > possible timeouts - SCSI (an early 80s era technology) is a notorious > example, USB (connectivity for all kinds of possibly very dumb and possibly > very slow devices) is another. Just curious: Do you have any idea how much of the boot time is spent waiting for hardware timeouts? Could this be 60% ? Is there any work on trying to run tasks concurrently on boot? (Subject to a task interdependencies, of course.) Regards, Håkon Hallingstad

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POSIX timers on SuSE 9.2
by Klaus Schneider 15 Apr '05

15 Apr '05

Hello! I'm trying to write an app using POSIX timers. But timer_create() fails everytime I call it with "Resource temporarily unavailable". This must be a SuSE problem: The program works on QNX and on my Debian Linux machine at home. What could be causing this problem? Perhaps it's something in the SuSE kernel or with SuSE's glibc? I have searched through google and mailing lists but there was nothing, and I have no idea what to do. Many Thanks! Klaus My System: Distribution: SuSE 9.2 Linux werckmeister 2.6.8-24.13-default #1 Fri Mar 18 10:19:42 UTC 2005 i686 i686 i386 GNU/Linux GNU C Library stable release version 2.3.3 (20040917), by Roland McGrath et al. Copyright (C) 2004 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Configured for i686-suse-linux. Compiled by GNU CC version 3.3.4 (pre 3.3.5 20040809). Compiled on a Linux 2.6.8.1 system on 2004-10-05. Available extensions: GNU libio by Per Bothner crypt add-on version 2.1 by Michael Glad and others linuxthreads-0.10 by Xavier Leroy GNU Libidn by Simon Josefsson NoVersion patch for broken glibc 2.0 binaries BIND-8.2.3-T5B libthread_db work sponsored by Alpha Processor Inc NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk Thread-local storage support included. My code: #include <signal.h> #include <time.h> #include <stdio.h> /* perror() */ /* prototype */ void timer_handler(int); int main(void) { struct sigevent sig_spec; sigset_t allsigs; struct itimerspec tmr_setting; timer_t timer_id; /* setup signal to respond to timer */ if (signal(SIGALRM, timer_handler) == SIG_ERR) { perror("signal"); return -1; } /* create timer, which uses the REALTIME clock */ sig_spec.sigev_signo = SIGALRM; #ifdef __QNX__ /* QNX has slightly other prototype */ if ((timer_id = timer_create(CLOCK_REALTIME, &sig_spec)) < 0) { #else sig_spec.sigev_notify = SIGEV_SIGNAL; if (timer_create(CLOCK_REALTIME, &sig_spec, &timer_id) < 0) { #endif perror("timer_create"); return -1; } /* set the initial expiration and frequency of timer */ tmr_setting.it_value.tv_sec = 1; tmr_setting.it_value.tv_nsec = 0; tmr_setting.it_interval.tv_sec = 1; tmr_setting.it_interval.tv_nsec = 0; if (timer_settime(timer_id, 0, &tmr_setting, NULL) < 0) { perror("settimer"); return -1; } /* wait for signals */ sigemptyset(&allsigs); while (1) { sigsuspend(&allsigs); printf("signal\n"); } } /* signal routine */ void timer_handler(int signum) { printf("timer\n"); }

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no sqrt() in math.h
by Colin Carter 11 Apr '05

11 Apr '05

Hi, I have just moved into Linux and compiled, linked and executed a simple C program with X Window. This required standard #include <...> But when I tried to use sqrt() I added #include <math.h> but x = sqrt ( x ); gives me 'undefined reference 'sqrt' Any ideas? Regards, Colin

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focus in Xt programming
by Colin Carter 09 Apr '05

09 Apr '05

Hi, When I execute a program which I have compiled and linked (even one lifted out of the book by Kurt Wall et al) the code opens a window but the focus remains with the Shell Konsole. Focus follows all other application code okay. Any ideas? Second question: How do I specify that buttons should be of a fixed size? (main window follows my specified sizing) and how can I specify that buttons be displayed side by side? Regards, Colin

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RE: [suse-programming-e] math.h
by Hallingstad Håkon 08 Apr '05

08 Apr '05

Add -lm when compiling Regards, Håkon Hallingstad Software Developer, EDB +47 2252 8218 hakon.hallingstad(a)edb.com www.edb.com "IT er ikke alt - men det hjelper" -----Original Message----- From: Colin Carter [mailto:colincarter@exemail.com.au] Sent: 8. april 2005 14:11 To: suse-programming-e(a)suse.com Subject: [suse-programming-e] math.h Hi, I have just moved into Linux and compiled, linked and executed a simple C program with X Window. This required standard #include <...> But when I tried to use sqrt() I added #include <math.h> but x = sqrt ( x ); gives me 'undefined reference 'sqrt' Any ideas? Regards, Colin -- To unsubscribe, email: suse-programming-e-unsubscribe(a)suse.com For additional commands, email: suse-programming-e-help(a)suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

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math.h
by Colin Carter 08 Apr '05

08 Apr '05

Hi, I have just moved into Linux and compiled, linked and executed a simple C program with X Window. This required standard #include <...> But when I tried to use sqrt() I added #include <math.h> but x = sqrt ( x ); gives me 'undefined reference 'sqrt' Any ideas? Regards, Colin

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RE: [suse-programming-e] cvs
by Hallingstad Håkon 08 Apr '05

08 Apr '05

You must export the CVSROOT environment variable: export CVSROOT=/data1/projcvs Regards, Håkon Hallingstad Software Developer, EDB +47 2252 8218 hakon.hallingstad(a)edb.com www.edb.com "IT er ikke alt - men det hjelper" -----Original Message----- From: Colin Carter [mailto:colincarter@exemail.com.au] Sent: 8. april 2005 09:07 To: suse-programming-e(a)suse.com Subject: [suse-programming-e] cvs I am just starting with cvs and think that I understand the documentation. But ... I executed $cvs -d /data1/projcvs init This gave me the apprpriate set up in the correct place. On a different day I set the cvs root thus: CVSROOT=/data1/projcvs (and I did also try /data1/projcvs/CVSROOT) Then I tried to put my files in by cvs import -m"Initial code" name1 nameTage1 0.0 but I get the error No CVSROOT specified! Please use the '-d' option cvs [import aborted]: or set the CVSROOT environment variable So I tried cvs import -d /data1/projcvs -m"Initial code" name1 nameTage1 0.0 and variations but have had no luck. Anyone any ideas? Thanks for your time, Colin -- To unsubscribe, email: suse-programming-e-unsubscribe(a)suse.com For additional commands, email: suse-programming-e-help(a)suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

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cvs
by Colin Carter 08 Apr '05

08 Apr '05

I am just starting with cvs and think that I understand the documentation. But ... I executed $cvs -d /data1/projcvs init This gave me the apprpriate set up in the correct place. On a different day I set the cvs root thus: CVSROOT=/data1/projcvs (and I did also try /data1/projcvs/CVSROOT) Then I tried to put my files in by cvs import -m"Initial code" name1 nameTage1 0.0 but I get the error No CVSROOT specified! Please use the '-d' option cvs [import aborted]: or set the CVSROOT environment variable So I tried cvs import -d /data1/projcvs -m"Initial code" name1 nameTage1 0.0 and variations but have had no luck. Anyone any ideas? Thanks for your time, Colin

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