Udpcast November 2010

udpcast@udpcast.linux.lu

1 participants
8 discussions

by George Coulouris

Hello, If udp-receiver is writing to a pipe and the pipe fails, udp-receiver will incorrectly exit with a returncode of zero. This is easily tested with a trivial pipe program that copies stdin to stdout, but exits with a nonzero status upon encountering eof. Adding the following to startReceiver() in udpr-negotiate.c is sufficient to fix this behavior: <---- cut here int ret; ... if(pipePid) { ret=udpc_waitForProcess(pipePid, "Pipe"); } ... return ret; <---- cut here Regards, George Coulouris National Center for Biotechnology Information (contractor)

11 years, 1 month

patch submit: Use "flprintf()" on every printout on stderr

by Julien Aube

Hello, While using udpcast, I found out that it may be very verbose on stderr, even if a logfile is specified. This turns out to be a problem for our embedded application where the stderr is a (slow) serial port. So here is a patch which replace every occurrence of fprint(sdterr,...) by the flprintf() function defined in log.c. I thought it might be of some use for people. (This patch also happen to cleanup the blank spaces at end of lines) Julien -- People in the embedded space don't do prototypes. They hack something until it works, then it's done. --- Always code as if the person who will maintain your code is a maniac serial killer that knows where you live

11 years, 10 months

castomize udpcast iso image

by Gianluigi Autuori

I want to use Udpcast from iso image in this scenario: - first pc boots from udpcast iso image -second pc boots from ethernet using pxe that sends him udpreceiver How can I do it? thanks

11 years, 10 months

patch submit: Provide a watchdog on receiver

by Julien Aube

Hello, I've made the attached patch to prevent the situation where the udp-receiver hang out indefinitly waiting for data when the server has been killed after having started to send data. In this case, the udp-received program would hang indefinitly. Since in my program, udp-receiver is called through system(...); the result is a hang. With this patch I use a SIGALARM signal to reset a flag to 0, and act as a watchdog. The watchdog is started just before the sending data phase of the protocol, and is feed each time a packet is received from the server. If 2 times in a row the watchdog is not feed, the program exit in error. The current value is set as a #define as 60s, which is in effect 2mn before udp-receiver is actually killed. However I am aware that this implementation is somehow crude, and I would be interested by any other way to do that. Additionally, if someone is interested by this patch, I could make it so that the watchdog period is configurable on the command-line. Thanks for your time, Julien -- People in the embedded space don't do prototypes. They hack something until it works, then it's done. --- Always code as if the person who will maintain your code is a maniac serial killer that knows where you live

11 years, 10 months

Support for Apple iMac keyboards (hid_apple) in udpcast images

by Frederik Himpe

I tried booting a recent Apple iMac with the latest kernel and an initrd from cast-o-matic, but the kayboard fails to work. Looking at an installed Debian system, the module hid_apple is loaded. Is this driver missing from the udpcast images, and is it possible to add it? -- Frederik Himpe <fhimpe(a)vub.ac.be> Vrije Universiteit Brussel

11 years, 10 months

Socket problem in receiver

by Sergio Sánchez Vega

Hello, I´m using latest udpcast versión (20100130) in Debian machines to transfer files in unidirectional mode. Sometimes I see the next message in receiver machine: Receiver error After putting some fprintf I realized the problem is in the file udpr-negotiate.c in line 191: sock = udpc_selectSock(client_config.socks, NR_CLIENT_SOCKS, net_config->startTimeout); if(sock < 0) { return -1; } Why sock is < 0? What should I do? Thanks

11 years, 11 months

static compile

by cruejones＠comcast.net

Is there an easy way to statically compile udpcast? currently: # ldd udp-receiver linux-vdso.so.1 => (0x00007fffde082000) libdl.so.2 => /lib64/libdl.so.2 (0x00007fd71bef7000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fd71bcda000) libc.so.6 => /lib64/libc.so.6 (0x00007fd71b97c000) /lib64/ld-linux-x86-64.so.2 (0x00007fd71c0fb000) thanks

11 years, 11 months

PXE image fails to boot

by Lluís Gras

Hi all I've been using udpcast to clone about 32 pc on a classroom for a months, i don't remember exactly which versión of udpcast but now after upgrade to 20100131 version things stop working, after loading of initrd image boot process stops with message about: No filesystem could mount root, tried: Kernel - panic .... unable to mount rootfs on unknown-block(1,0) I tried to dissasemble initrd to look at init, but isn't a cpio image ( cpio -i < ../initrd ) By now, i return tu use last image, have a backup at /var/lib/tftpboot/udpcast.orig, but i like tu use new version to know if it corrects some delay with boot on systems with usb keyboards. ns1:/var/lib/tftpboot# tree -sf . ├── [ 4096] ./udpcast │ ├── [ 4415169] ./udpcast/initrd │ ├── [ 708192] ./udpcast/linux │ ├── [ 9360] ./udpcast/pxelinux.0 │ └── [ 4096] ./udpcast/pxelinux.cfg │ └── [ 134] ./udpcast/pxelinux.cfg/default └── [ 4096] ./udpcast.orig ├── [ 4142599] ./udpcast.orig/initrd ├── [ 619632] ./udpcast.orig/linux ├── [ 9360] ./udpcast.orig/pxelinux.0 └── [ 4096] ./udpcast.orig/pxelinux.cfg └── [ 784] ./udpcast.orig/pxelinux.cfg/default ns1:/var/lib/tftpboot# cat udpcast/pxelinux.cfg/default default linux label linux kernel linux append load_ramdisk=1 initrd=initrd root=01:00 auto=yes lang=US kbdmap=US ipappend 3 ns1:/var/lib/tftpboot# cat udpcast.orig/pxelinux.cfg/default default linux label linux kernel linux # append load_ramdisk=1 initrd=initrd root=/dev/ram0 auto=yes lang=US kbmap=US dhcp=yes port=9000 enableDiskmodule=yes netmodparm= diskmodparm= udpcparam= disk=/dev/sda compr=lzop append load_ramdisk=1 initrd=initrd root=/dev/ram0 auto=yes lang=US kbmap=US dhcp=yes port=9000 enableDiskmodule=yes netmodparm= diskmodparm= udpcparam= disk=/dev/sda6 compr=lzop ipappend 1 Thanks for this great tool. -- ... en el país de los ciegos el tuerto es el rey y diciendo esto se arranco un ojo ...

12 years, 6 months

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Udpcast November 2010