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  • How to re-open a closed file descriptor

    - by chaitu
    I have a scenario where i created pipe for communication between two child and parent. Parent writes (using write function)data to the pipe and closes the respective file descriptor. The problem is when i want to write data again to the pipe, the write function is returning error code -1. I think its because writing end has been closed in previous iteration. Then how to open the corresponding file descriptor after it has been closed once. I tried using open() function which requires path to some file as arguement. But i am not using any files in my application. I have simple file descriptors (int arr[2]). Is it possible to achieve above scenario with pipes????

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  • MySql "comments" parameter as descriptor?

    - by Nick
    So, I'm trying to learn a lot at once, and this place is really helpful! I'm making a little running log website for myself and maybe a few other people, and I have it so that the user can add workouts for each day. With each workout, I have a variety of information the user can fill out for the workout, such as running distance, time, quality of run, course, etc... I store this in a MySql database as a table with fields titled "distance", "time", "runquality", etc... Now, these field titles don't match up with what I want displayed on the running log, so I was thinking of using the "Comments" attribute for a field to store its human-readable title--thus the field "runquality" would have "Quality of run" as its comment, and then I would pull the comment with a SQL query and display it instead of the field name. Is this a good theoretical/practical way of going about it? And what sort of SQL would I use to pull the comment for the field anyway? Secondly, suppose I want to add the ability for the user to create their own workout descriptors. So say a user wants to add a "temperature" descriptor for their workout. Should I create a script that adds fields to my workout table, or should I create a separate table listing only workout descriptors and somehow link the descriptor table with the "contents" table? I haven't learned any theory about database design or anything so any help is appreciated!

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  • NullPointerException on jetty 7 startup with jetty deployment descriptor

    - by Draemon
    I'm getting the following error when I start Jetty: 2010-03-01 12:30:19.328:WARN::Failed startup of context WebAppContext@15ddf5@15ddf5/webapp,null,/path/to/jetty-distribution-7.0.1.v20091125/webapps-plus/webapp.war With this commandline: java -jar start.jar OPTIONS=All lib=/path/to/jetty-distribution-7.0.1.v20091125/lib/ext etc/jetty.xml etc/jetty-plus.xml /path/to/webapp/src/configuration/test.xml And test.xml contains: <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://www.eclipse.org/jetty/configure.dtd"> <Configure class="org.eclipse.jetty.webapp.WebAppContext"> <Set name="contextPath">/webapp</Set> <Set name="war"><SystemProperty name="jetty.home" default="."/>/webapps-plus/webapp.war</Set> </Configure> If I don't include test.xml on the commandline it works fine.

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  • How to track down a file descriptor leak?

    - by cclark
    I have a java process (Glassfish) which is leaking file descriptors. I know this because I get the helpful java.io.IOException: Too many open files exception. I can look in /proc/PID#/fd and see all the open file descriptors. When I use lsof I get a very large number of entries like this: java 18510 root 8811u sock 0,4 1576079 can't identify protocol java 18510 root 8812u sock 0,4 1576111 can't identify protocol java 18510 root 8813u sock 0,4 1576150 can't identify protocol I see 12 new ones created per minute. What options can I use on lsof or what other tools are available to me to help track down socket file descriptors where the protocol can't be identified? thanks, chuck

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  • redirect temporarily STDOUT to another file descriptor, but still to screen

    - by Carlos Campderrós
    I'm making a script that executes some commands inside, and these commands show some output on STDOUT (and STDERR as well, but that's no problem). I need that my script generates a .tar.gz file to STDOUT, so the output of some commands executed in the script also go to STDOUT and this ends with a not valid .tar.gz file in the output. So, in short, it's possible to output the first commands to the screen (as I still want to see the output) but not via STDOUT? Also I would like to keep the STDERR untouched so only error messages appear there. A simple example of what I mean. This would be my script: #!/bin/bash # the output of these commands shouldn't go to STDOUT, but still appear on screen some_cmd foo bar other_cmd baz #the following command creates a tar.gz of the "whatever" folder, #and outputs the result to STDOUT tar zc whatever/ I've tried messing with exec and the file descriptors, but I still can't get it to work: #!/bin/bash # save STDOUT to #3 exec 3>&1 # the output of these commands should go to #3 and screen, but not STDOUT some_cmd foo bar other_cmd baz # restore STDOUT exec 1>&3 # the output of this command should be the only one that goes to STDOUT tar zc whatever/ I guess I'm lacking closing STDOUT after the first exec and reopen it again or something, but I can't find the right way to do it (right now the result is the same as if I didn't add the execs

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  • Getting a file pointer from file descriptor

    - by Naga Kiran
    In PHP 5.2.3, "fdopen" was used to read/write to a file descriptor that's opened by another application. fdopen(<fileDescriptorId>,"rw"); //It worked fine with PHP 5.2.3 After upgrading PHP to 5.3.2, it's throwing "undefined reference to 'fdopen' function". Please suggest whats the replacement for this in PHP 5.3.2 or any workaround.

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  • bad file descriptor with close() socket (c++)

    - by user321246
    hi everybody! I'm running out of file descriptors when my program can't connect another host. The close() system call doesn't work, the number of open sockets increases. I can se it with cat /proc/sys/fs/file-nr Print from console: connect: No route to host close: Bad file descriptor connect: No route to host close: Bad file descriptor .. Code: #include <stdio.h> #include <stdlib.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> #include <string.h> #include <iostream> using namespace std; #define PORT 1238 #define MESSAGE "Yow!!! Are we having fun yet?!?" #define SERVERHOST "192.168.9.101" void write_to_server (int filedes) { int nbytes; nbytes = write (filedes, MESSAGE, strlen (MESSAGE) + 1); if (nbytes < 0) { perror ("write"); } } void init_sockaddr (struct sockaddr_in *name, const char *hostname, uint16_t port) { struct hostent *hostinfo; name->sin_family = AF_INET; name->sin_port = htons (port); hostinfo = gethostbyname (hostname); if (hostinfo == NULL) { fprintf (stderr, "Unknown host %s.\n", hostname); } name->sin_addr = *(struct in_addr *) hostinfo->h_addr; } int main() { for (;;) { sleep(1); int sock; struct sockaddr_in servername; /* Create the socket. */ sock = socket (PF_INET, SOCK_STREAM, 0); if (sock < 0) { perror ("socket (client)"); } /* Connect to the server. */ init_sockaddr (&servername, SERVERHOST, PORT); if (0 > connect (sock, (struct sockaddr *) &servername, sizeof (servername))) { perror ("connect"); sock = -1; } /* Send data to the server. */ if (sock > -1) write_to_server (sock); if (close (sock) != 0) perror("close"); } return 0; }

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  • Maven assembly - Error reading assemblies

    - by Laurent
    Dear all, I have defined a personalized jar-with-dependencies assembly descriptor. However, when I execute it with mvn assembly:assembly, I get : ... [INFO] META-INF/ already added, skipping [INFO] META-INF/MANIFEST.MF already added, skipping [INFO] javax/ already added, skipping [INFO] META-INF/ already added, skipping [INFO] META-INF/MANIFEST.MF already added, skipping [INFO] META-INF/maven/ already added, skipping [INFO] [assembly:assembly {execution: default-cli}] [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Error reading assemblies: No assembly descriptors found. My jar-with-dependencies.xml is in src/main/resources/assemblies/. My assembly descriptor is the following : <?xml version='1.0' encoding='UTF-8'?> <assembly> <id>jar-with-dependencies</id> <formats> <format>jar</format> </formats> <dependencySets> <dependencySet> <scope>runtime</scope> <unpack>true</unpack> <unpackOptions> <excludes> <exclude>**/LICENSE*</exclude> <exclude>**/README*</exclude> </excludes> </unpackOptions> </dependencySet> </dependencySets> <fileSets> <fileSet> <directory>${project.build.outputDirectory}</directory> <outputDirectory>/</outputDirectory> </fileSet> <fileSet> <directory>src/main/resources/META-INF/services</directory> <outputDirectory>META-INF/services</outputDirectory> </fileSet> </fileSets> </assembly> And my project pom.xml is : <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-assembly-plugin</artifactId> <version>2.2-beta-5</version> <executions> <execution> <id>jar-with-dependencies</id> <phase>package</phase> <goals> <goal>single</goal> </goals> <configuration> <descriptors> <descriptor>jar-with-dependencies.xml</descriptor> </descriptors> <archive> <manifest> <mainClass>org.my.app.HowTo</mainClass> </manifest> </archive> </configuration> </execution> </executions> </plugin> When mvn assembly:assembly is performed, dependencies are unpacked and I get the previous error when unpack has finished. Moreover, if I execute mvn -e assembly:assembly it is say that no descriptors has been found, however it try to unpack dependencies and a JAR with dependencies is created but it doesn't contain META-INF/services/* as specified in descriptor : [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Error reading assemblies: No assembly descriptors found. [INFO] ------------------------------------------------------------------------ [INFO] Trace org.apache.maven.lifecycle.LifecycleExecutionException: Error reading assemblies: No assembly descriptors found. at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:284) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138) at org.apache.maven.cli.MavenCli.main(MavenCli.java:362) at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) at org.codehaus.classworlds.Launcher.main(Launcher.java:375) Caused by: org.apache.maven.plugin.MojoExecutionException: Error reading assemblies: No assembly descriptors found. at org.apache.maven.plugin.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:356) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694) ... 17 more Caused by: org.apache.maven.plugin.assembly.io.AssemblyReadException: No assembly descriptors found. at org.apache.maven.plugin.assembly.io.DefaultAssemblyReader.readAssemblies(DefaultAssemblyReader.java:206) at org.apache.maven.plugin.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:352) ... 19 more I don't see my error. Does someone has a solution ? Kind Regards Laurent

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  • ORA-12514 TNS:listener does not currently know of service requested in connect descriptor

    - by Jacques
    We have an application running locally which two days worked fine and now we get the: TNS:listener does not currently know of service requested in connect descriptor error. I've tested the connection using TNSPing which resolved correctly and Tried SQLPlus to try connecting, which failed with the same error. (i.e. Sqlplus username/passowrd@addressname[or host name] The TNS Listener on the server is running. Oracle itself on the server is running. We don't know of any changes that were made to this environment. Anything else we can test to figure this one out? Thanks, Jacques

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  • Bad File descriptor

    - by Luke
    Does anyone see a problem with this, its not working saying bad file descriptor not sure why? pipe(pipefd[0]); if ((opid = fork()) == 0) { dup2(pipefd[0][1],1);/*send to output*/ close(pipefd[0][0]); close(pipefd[0][1]); execlp("ls","ls","-al",NULL); } if((cpid = fork())==0){ dup2(pipefd[0][1],0);/*read from input*/ close(pipefd[0][0]); close(pipefd[1][1]); execlp("grep","grep",".bak",NULL); } close(pipefd[0][0]); close(pipefd[0][1]);

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  • Java - AWT / Swing - handling the Event Descriptor Thread

    - by waitinforatrain
    Hi, I have a question about the 'Event Descriptor Thread'. I have a Main class that is also a JFrame. It initialises the rest of the components in the code, some of them do not involve Swing and some of them do. Is it enough to simply initialise the Main class using the EDT like this?... public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { new Main(); } }); } This way everything would run on the Event Dispatcher thread.

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  • Entity Framework This property descriptor does not support the SetValue

    - by Gayan
    Hello guys, below are my entities which i have created using entity frame work. retailer id name childs(navigation) generated database schema [Id] [int] IDENTITY(1,1) NOT NULL, [Name] nvarchar NOT NULL childern id name RETAILER(navigation) generated database schema [Id] [int] IDENTITY(1,1) NOT NULL, [name] nvarchar NOT NULL [Retailer_Id] [int] NOT NULL, As you can see in the above model the relationship is 1 retailer can have 0 or 1 child. my problem is when i create a new child and set the retailer navigation property of it to a retailer entity it throws the following exception.how do i solve it Error while setting property 'retailer': 'This property descriptor does not support the SetValue method.'.

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  • Duplicate file descriptor after popen

    - by alaamh
    I am using popen to execute a command under linux, then 4 process wile use the same output. I am trying to duplicate the file descriptor again to pass it to each process. here is my code: FILE* file_source = (FILE*) popen(source_command, "r"); int fd = fileno(file_source); fdatasync(fd); int fd[4],y, total = 4 ; for (y = 0; y < total; y++) { dest_fd[y] = dup(fd); } actually if total set to 1 it work fin, after changing total = 4 it does not work anymore.

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  • Bash file descriptor leak

    - by Charles Duffy
    I get a file descriptor leak when running the following code: function get_fd_count() { local fds cd /proc/$$/fd; fds=( * ) # avoid a StackOverflow source colorizer bug echo "${#fds[@]}" } function fd_leak_func() { echo ">> Current FDs: $(get_fd_count)" read retval new_state < <(set +e; new_state=$(echo foo); retval=$?; printf "%d %s\n" $retval $new_state) } function parent_func() { while fd_leak_func; do :; done } parent_func Tested on both 3.2.25 and 4.0.28. Taking the while loop out of parent_func and running it at top level makes the problem go away. What's going on here? More to the point, are workarounds available?

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  • File descriptor limits and default stack sizes

    - by Charles
    Where I work we build and distribute a library and a couple complex programs built on that library. All code is written in C and is available on most 'standard' systems like Windows, Linux, Aix, Solaris, Darwin. I started in the QA department and while running tests recently I have been reminded several times that I need to remember to set the file descriptor limits and default stack sizes higher or bad things will happen. This is particularly the case with Solaris and now Darwin. Now this is very strange to me because I am a believer in 0 required environment fiddling to make a product work. So I am wondering if there are times where this sort of requirement is a necessary evil, or if we are doing something wrong. Edit: Great comments that describe the problem and a little background. However I do not believe I worded the question well enough. Currently, we require customers, and hence, us the testers, to set these limits before running our code. We do not do this programatically. And this is not a situation where they MIGHT run out, under normal load our programs WILL run out and seg fault. So rewording the question, is requiring the customer to change these ulimit values to run our software to be expected on some platforms, ie, Solaris, Aix, or are we as a company making it to difficult for these users to get going? Bounty: I added a bounty to hopefully get a little more information on what other companies are doing to manage these limits. Can you set these pragmatically? Should we? Should our programs even be hitting these limits or could this be a sign that things might be a bit messy under the covers? That is really what I want to know, as a perfectionist a seemingly dirty program really bugs me.

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  • Reading a binary file in perl: Bad File Descriptor

    - by Magicked
    I'm trying to read a binary file 40 bytes at a time, then check to see if all those bytes are 0x00, and if so ignore them. If not, it will write them back out to another file (basically just cutting out large blocks of null bytes). This may not be the most efficient way to do this, but I'm not worried about that. However, right now I'm getting a "Bad File Descriptor" error and I cannot figure out why. my $comp = "\x00" * 40; my $byte_count = 0; my $infile = "/home/magicked/image1"; my $outfile = "/home/magicked/image1_short"; open IN, "<$infile"; open OUT, ">$outfile"; binmode IN; binmode OUT; my ($buf, $data, $n); while (read (IN, $buf, 40)) { ### Problem is here ### $boo = 1; for ($i = 0; $i < 40; $i++) { if ($comp[$i] != $buf[$i]) { $i = 40; print OUT $buf; $byte_count += 40; } } } die "Problems! $!\n" if $!; close OUT; close IN; I marked with a comment where it is breaking. Thanks for any help!

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  • Deploying a WAR to tomcat only using a context descriptor

    - by DanglingElse
    i need to deploy a web application in WAR format to a remote tomcat6 server. The thing is that i don't want to do that the easy way, meaning not just copy/paste the WAR file to /webapps. So the second choice is to create a unique "Context Descriptor" and pointing this out to the WAR file. (Hope i got that right till here) So i have a few questions: Is the WAR file allowed to be anywhere in the file system? Meaning can i copy the WAR file anywhere in the remote file system, except /webapps or any other folder of the tomcat6 installation? Is there an easy way to test whether the deployment was successful or not? Without using any browser or anything, since i'm reaching to the remote server only via SSH and terminal. (I'm thinking ping?) Is it normal that the startup.sh/shutdown.sh don't exist? I'm not the admin of the server and don't know how the tomcat6 is installed. But i'm sure that in my local tomcat installations these files are in /bin and ready to use. I mean you can still start/restart/stop the tomcat etc., but not with the these -standard?- scripts. Thanks a lot.

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  • c unix- Select() send and receive with same socket descriptor

    - by RileyVanZeeland
    I am wanting to use select to receive and send on a client/server on the same socket descriptor (serverside). timestruct* myTime; sockfd = accept(listeningFd, 0, 0); while(1) FD_ZERO(&my_fd_set) maxFd = sockfd FD_ZERO(&my_fd_set); FD_SET(sockfd, &my_fd_set); select(maxFd+1, &my_fd_set, &my_fd_set, NULL, myTime); for (j=0; j<=maxFd; j++) if(FD_ISSET(j, &temp_fd_set)) if(j==sockfd) send() if(j==sockfd) recv() This is essentially what I want to do. Obviously this won't work because sockfd is going to be the same value for sending and receiving. Is there a way I can do this without using fork()?? Currently I have a blocking recv and send but the server could be required to recv multiple commands while another command is being processed to send back to the client. I am very knew to c and also 'select()'. Because select has the three fd_set options (read, write, execute) I thought maybe I could do this. Thank you.

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  • Force blocking read after EAGAIN?

    - by Daniel Trebbien
    I have a file descriptor that is open for reading which may be non-blocking. What I need to do is simply read all data until reaching EOF and write that data to a writable file descriptor. As the process that performs this copying is not "aware" of anything that is going on around it, I don't think that I can do something useful while waiting for data, and I don't want to use a while loop (while errno is not EAGAIN) because I think that it would be wasteful. Is there a way to block or otherwise suspend execution of the copying process until data becomes available?

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  • USB Drive Not recognized

    - by user36582
    My Friend's Pen Drive, which was working well very well just few days ago, is not being recognized after getting used by a virus affected machine. Its not on fdisk -l or lsusb However in dmesg I can see the following: [ 977.300013] usb 5-2: new full speed USB device using uhci_hcd and address 2 [ 977.420014] usb 5-2: device descriptor read/64, error -71 [ 977.644023] usb 5-2: device descriptor read/64, error -71 [ 977.860013] usb 5-2: new full speed USB device using uhci_hcd and address 3 [ 977.980013] usb 5-2: device descriptor read/64, error -71 [ 978.204013] usb 5-2: device descriptor read/64, error -71 [ 978.420013] usb 5-2: new full speed USB device using uhci_hcd and address 4 [ 978.828015] usb 5-2: device not accepting address 4, error -71 [ 978.940015] usb 5-2: new full speed USB device using uhci_hcd and address 5 [ 979.348013] usb 5-2: device not accepting address 5, error -71 [ 979.348292] hub 5-0:1.0: unable to enumerate USB device on port 2 [ 1017.848015] usb 5-2: new full speed USB device using uhci_hcd and address 6 [ 1017.968012] usb 5-2: device descriptor read/64, error -71 [ 1018.192017] usb 5-2: device descriptor read/64, error -71 [ 1018.408014] usb 5-2: new full speed USB device using uhci_hcd and address 7 [ 1018.528012] usb 5-2: device descriptor read/64, error -71 [ 1018.752023] usb 5-2: device descriptor read/64, error -71 [ 1018.968012] usb 5-2: new full speed USB device using uhci_hcd and address 8 [ 1019.376019] usb 5-2: device not accepting address 8, error -71 [ 1019.488011] usb 5-2: new full speed USB device using uhci_hcd and address 9 [ 1019.896016] usb 5-2: device not accepting address 9, error -71 [ 1019.896308] hub 5-0:1.0: unable to enumerate USB device on port 2 [ 1049.984016] usb 5-1: new full speed USB device using uhci_hcd and address 10 [ 1050.104014] usb 5-1: device descriptor read/64, error -71 [ 1050.328014] usb 5-1: device descriptor read/64, error -71 [ 1050.544014] usb 5-1: new full speed USB device using uhci_hcd and address 11 [ 1050.664018] usb 5-1: device descriptor read/64, error -71 [ 1050.888019] usb 5-1: device descriptor read/64, error -71 [ 1051.104025] usb 5-1: new full speed USB device using uhci_hcd and address 12 [ 1051.512014] usb 5-1: device not accepting address 12, error -71 [ 1051.624101] usb 5-1: new full speed USB device using uhci_hcd and address 13 [ 1052.032014] usb 5-1: device not accepting address 13, error -71 [ 1052.032991] hub 5-0:1.0: unable to enumerate USB device on port 1 What these Errors actually mean and how Can I get this pen drive Back to work ??

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  • Python: why can't descriptors be instance variables?

    - by Continuation
    Say I define this descriptor: class MyDescriptor(object): def __get__(self, instance, owner): return self._value def __set__(self, instance, value): self._value = value def __delete__(self, instance): del(self._value) And I use it in this: class MyClass1(object): value = MyDescriptor() >>> m1 = MyClass1() >>> m1.value = 1 >>> m2 = MyClass1() >>> m2.value = 2 >>> m1.value 2 So value is a class attribute and is shared by all instances. Now if I define this: class MyClass2(object) value = 1 >>> y1 = MyClass2() >>> y1.value=1 >>> y2 = MyClass2() >>> y2.value=2 >>> y1.value 1 In this case value is an instance attribute and is not shared by the instances. Why is it that when value is a descriptor it can only be a class attribute, but when value is a simple integer it becomes an instance attribute?

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