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  • Is pthread_spin_trylock safe inside of sigsegv handler of multithreaded application?

    - by TWMouton
    I am trying to implement a handler that on SIGSEGV will collect some information such as process-id, thread-id and a backtrace and write this information to a file/pipe/socket. The problem lies in that there is the (probably pretty high) possibility that if one thread experienced a SIGSEGV that the others will shortly follow. If two threads happen to make it to the bit of code where they're writing their report out at the same time then they'll interleave their writing (to the same file). I know that I should only be using async-signal-safe functions as detailed in signal(7) I also have seen at least two cases here and video linked in top answer here where others have used pthread_spin_trylock to get around this problem. Is this a safe way to prevent the above problem?

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  • Curl: How to insert value to a cookie?

    - by Crazy_Bash
    Ho to insert cookies value in curl? from firebug "request headers" i can see in the following "Cookie: PHPSESSID=gg792c2ktu6sch6n8q0udd94o0; was=1; uncheck2=1; uncheck3=1; uncheck4=1; uncheck5=0; hd=1; uncheck1=1" I have tried the following: curl http://site.com/ -s -L -b cookie.c -c cookie.c -d "was=1; uncheck2=1; uncheck3=1; uncheck4=1; uncheck5=0; hd=1; uncheck1=1" > comic and the only thing i see in cookie.c is PHPSESSID=gg792c2ktu6sch6n8q0udd94o0; was=1;

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  • Simple cdd (custom debian distribution) problem

    - by Daniel G. R.
    Hi everyone, Im trying to make my own debian distribution but I have a problem. simple-cdd works fine but when I try to install my generated .iso, everything goes right since a message apears: " No installable kernel was found in the defined APT sources You may try to continue without a kernel. and manually install your kernel later. This is only recommended for experts, otheriwse you will likely end with a machine that dosent boot. COntinue Without installing a kernel? " And if y say yes, it continues... When is time to install grub it says: " Installation step failed An installation step failed. You can try to run the failing item again from the menu, or skip it and choose something else. The failing step is: Install the GRUB boot loader on a hard disk " HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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  • How to programmatically switch to a specific window in compiz?

    - by FossilBit
    Is there a command to tell compiz that we want to bring in front and set focus to a specific window? How should we identify the window in that command? The reason behind this question is the following use-case: Suppose we have a wiki to keep notes of anything interesting we find out. It would be very convenient to have a keyboard shortcut to bring the browser window with our Wiki page in front and start typing immediately then with another key combination switch to the application we were working before I know that "ALT+TAB" switches between the last two used windows but cannot support more complex combinations of applications. E.g Browser+Eclipse+ Wiki If there is a command like the one described, it is easy to add a shortcut to it from KDE or GNOME interface Thanx ...

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  • pthread_exit return value

    - by Manty
    This is surprising for me. void * thread_func(void *arg) { pthread_exit(&ret); } int main(void) { pthread_t thr; int *exit_status; pthread_create(&thr, NULL, thread_func, NULL); sleep(2); pthread_join(thr, (void **)&exit_status); printf("value of exit status - %d\n", *exit_status); ret = 20; pthread_join(thr, (void **)&exit_status); printf("value of exit status - %d\n", *exit_status); return 0; } The output is value of exit status - 50 value of exit status - 20 I was expecting both the times the exit_status would be the actual exit value(50 in my case) of the thread. Instead it is just returning the value of the global variable which I used for pthread_exit. Is it not a bug?

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  • Which not displaying location of executible actually run.

    - by Nick
    I have a version of SVN on my system in /usr/bin/svn. This is too old to use with some repositories so I compiled a newer version in /home/user/built/bin/svn which works fine. I added this to my PATH so it should be run first. Typing which svn produces /home/user/built/bin/svn however typing svn --version reveals that it us using the old version still. if I run /home/user/built/bin/svn --version then the correct version is displayed. Since the custom version is first in my $PATH, and which lists it first why is the older version being invoked when I run svn? I thought which used your $PATH to find executables in the same fashion as the shell? [Edit] Type gives: type svn svn is hashed (/usr/bin/svn) Is this the problem?

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  • Format a timestamp into text

    - by user1257114
    I want to get the Modify date of a file and then format it into a human readable date. I am running a C program that gets information on when a particular file was last modified. My C Code contains a sytem cmd which contains a number of egreps, awks, seds separated by pipes. Using sed or awk or something similar, how can I convert 06 to June (This can be any month so an array or something is required) What I am trying to achieve is to end up with a string similar to: My C code contains: char string1[100] = ""; #define MAXCHAR 100 FILE *fp; char str[MAXCHAR], str2[MAXCHAR]; char* filename = "newfile"; /* stat: run 'stat' on the dtlName file to display status information. egrep: search for the pattern 'Modify' and print the lines containing it. awk: Get columns 2 & 3 sed: replace the . with a space, leaving 3 columns of output awk: only print cols 1 & 2 to newfile sed: replace '-' with ' ' in newfile awk: format output in newfile */ sprintf(string1, "/bin/stat %s \ | egrep Modify \ | /bin/awk '{print $2, $3}' \ | /bin/sed 's/\\./ /g' \ | /bin/awk '{print $1, $2}' \ | /bin/sed 's/-/ /g' \ | /bin/awk '{print $3,$2\", \"$1,\"at\",$4}' > newfile" , dtlName); system(string1); fp = fopen(filename, "r"); while (fgets(str, MAXCHAR, fp) != NULL) sprintf(str2,"%s", str); /* Write information to file */ DisplayReportFile (report); ReportEntry (report,L"Source file: %s, Created: %s\n\n",dtlName,str2);

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  • What are the different file permission codes and what do they mean?

    - by zeckdude
    I am working with a file upload script. I am currently uploading a file and then trying to echo out an anchor linking to that file, but since I used mkdir() with 0700 permissions to upload the file, it won't allow me access to view the file. I am pretty sure the problem I am experiencing is because of the file permission code I used. The problem is I just don't know what all the different file permission codes are and what they mean. Can somebody please list out all the different file permissions and what they each do?

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  • Cannot press QPushButton in a simple program

    - by shadyabhi
    Basically, I want a simple pushButton with a colorful text which when pressed exits the application. Why cant I press PushButton in this simple program. I am using QT 4.6 on Arch x86_64. #include <QtGui/QApplication> #include <QLabel> #include <QPushButton> #include<QtGui> int main(int argc, char *argv[]) { QApplication a(argc, argv); QMainWindow *Main=new QMainWindow; QPushButton *button = new QPushButton(Main); QLabel *label = new QLabel(Main); label->setText("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>"); label->setVisible(true); QObject::connect(button, SIGNAL(clicked()),label, SLOT(clear())); label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter); label->setWindowTitle("HelloWorld Test Program"); Main->show(); return a.exec(); }

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  • How could my code compliled correctly without necessary headers?

    - by ZhengZhiren
    I use the functions fork(),exec()... But how can this program compiled without including some extra headers(like sys/types.h, sys/wait.h). I use ubuntu 10.04 with gcc version 4.4.3 #include <stdio.h> #include <stdlib.h> int main() { pid_t pid; printf("before fork\n"); pid = fork(); if(pid == 0) { /*child*/ if(execvp("./cpuid", NULL)) { printf("error\n"); exit(0); } } else { if(wait(NULL) != -1) { printf("ok\n"); } } return 0; }

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  • Does "make install", by convention, updates the targets it installs?

    - by Pavel Shved
    You usually invoke the following commands to build a ./configured product: make make install Okay, the product is in the system now. Then you change some source code files and invoke only make install. The question is, does the conventional implementation of install target requires the executables to be recompiled, or just the old ones should be copied to the appropriate system path?

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  • Ubuntu Wired network(ethernet does not work)

    - by badnaam
    It was working just fine, until the other day I yanked it out. The wireless works just fine on the same router. If I login to a windows 7 instance on this dual boot laptop then the ehternet works just fine. So it's not a hardware, cable or router issue. The card even gets an ip, but I can't connect to the internet. Here are the details from route, iptables, ifconfig, ping etc. Any ideas? I have been struggling with this for day, none seems to have an answer. http://pastie.org/954816

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  • Rsync friendly gzip

    - by Pacifika
    I must not be the only one - I'm rsyncing .tar.gz files and notice that every time the full file gets rsynced rather than the differences. Reading into it it seems back in 1999 someone created an algorithm that fixed the issue http://svana.org/kleptog/rgzip.html (only 5% of data needed transferred) Has this gone anywhere since, how do I create rsync friendly .tar.gz files?

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  • Append all logs to /var/log

    - by iCy
    Application scenario: I have the (normal/permanent) /var/log mounted on an encrypted partition (/dev/LVG/log). /dev/LVG/log is not accessible at boot time, it needs to be manually activated later by su from ssh. A RAM drive (using tmpfs) is mounted to /var/log at init time (in rc.local). Once /dev/LVG/log is activated, I need a good way of appending everything in the tmpfs to /dev/LVG/log, before mounting it as /var/log. Any recommendations on what would be a good way of doing so? Thanks in advance!

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  • How to grep curl -I header information

    - by Mint
    Im trying to get the redirect link from a site by using curl -I then grep to "location" and then sed out the location text so that I am left with the URL. But this doesn't work, it will outputs the URL to screen and doesn't put it test=$(curl -I "http://www.redirectURL.com/" 2> /dev/null | grep "location" | sed -E 's/location:[ ]+//g') echo "1..$test..2" Which then outputs: ..2http://www.newURLfromRedirect.com/bla Whats going on?

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  • Is this safe? Is this OK to do in MYSQL?

    - by alex
    I have always done this: mysqldump -hlocalhost -uuser -ppass MYDATABASE > /home/f/db_backup/MYDATABASE.sql mysql -uuser -ppass MYDATABASE < MYDATABASE.sql But, if I do this instead...is this safe? Is this identical to the above??? mysqldump -hlocalhost -uuser -ppass MYDATABASE | gzip > /home/f/db_backup/MYDATABASE.sql.gz zcat MYDATABASE.sql.gz | mysql -uuser -ppass MYDATABASE

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  • unix DECLARE_WAIT_QUEUE_HEAD (var) var prototype?

    - by yoavstr
    hello i want to work with 2 queue in the module where i change my pointer to them therefore i need to use : //declartion wait_queue_head_t **currentQ; DECLARE_WAIT_QUEUE_HEAD (readWaitQ1); DECLARE_WAIT_QUEUE_HEAD (readWaitQ2); if(condition){ currentQ = &readWaitQ1; }else{ currentQ = &readWaitQ2; } but i get incorrect type for wake_up an other stuff using the queue. even thought i google it i couldnt find an answer can someone just give me the prototype needed?...

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  • Copying files and dirs on remote server while excluding some of them

    - by llaskin
    Server 1 is connected to Server 2 via SSH. We know this: I can execute a command such as " ssh server2 "cp -rv /var/www /tmp" " which will copy the entire /var/www dir to /tmp. However inside of /var/www we have the following structure(sample LS output below) $ ls /web1 /web2 /web3 file1.php file2.php file3.php How can I execute a cp command that will exclude /web1, /web3, file1.php and file3.php (obviously just copying web2 and file2 is not an option since there are significantly more files than just 6)

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