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  1. JDK
  2. JDK-6339493

(process) Runtime.exec does not close all file descriptors on Solaris 9

    Details

    • Subcomponent:
    • Resolved In Build:
      b79
    • CPU:
      sparc
    • OS:
      solaris_9

      Backports

        Description

        FULL PRODUCT VERSION :
        java version "1.5.0_05"
        Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05)
        Java HotSpot(TM) Server VM (build 1.5.0_05-b05, mixed mode)


        java version "1.4.2_09"
        Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_09-b05)
        Java HotSpot(TM) Client VM (build 1.4.2_09-b05, mixed mode)


        ADDITIONAL OS VERSION INFORMATION :
        SunOS mymachine 5.9 Generic_112233-12 sun4u sparc SUNW,Sun-Fire-V240

        A DESCRIPTION OF THE PROBLEM :
        When running Runtime.exec it seems that the JVM only closes the first 1024 inherited filedescriptors. If the JVM has more than 1024 fildescriptors open then the child process will inherit all filedescriptors > 1024.

        Tip, have a look at the C functions:

        #include <stdlib.h>

         void closefrom(int lowfd);

         int fdwalk(int (*func)(void *, int), void *cd);

        They can be used to close all filedescriptors without prior knowledge to which are opened.

        I've tested on several 1.4 releases, including the latest one 1.4.2_09 as well as the latest 1.5 relase. Problem occurs on all of them.



        STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        Compile and run the attached testprogram.

        First run with 10 open files.

        java -cp . FileDescriptorTest 10

        The program will open 10 files before doing Runtime.exec on /bin/bash.

        Now do,

        pfiles <pid of child (bash)>

        In my system I get:
        >ptree 22749

                22749 java -cp . FileDescriptorTest 10
                  22761 /bin/bash


        >pfiles 22761
        22761: /bin/bash
          Current rlimit: 8192 file descriptors
           0: S_IFIFO mode:0000 dev:316,0 ino:12545723 uid:57219 gid:205 size:0
              O_RDWR
           1: S_IFIFO mode:0000 dev:316,0 ino:12545724 uid:57219 gid:205 size:0
              O_RDWR
           2: S_IFIFO mode:0000 dev:316,0 ino:12545725 uid:57219 gid:205 size:0
              O_RDWR

        This is as expected, only STDIN, STDOUT and STDERR is open.

        Now rerun the program with more than 1024 files open in the parent:

        java -cp . FileDescriptorTest 1030

        The child now has more filedescriptors open:

        pfiles 15686:
        15686: /bin/bash
          Current rlimit: 8192 file descriptors
           0: S_IFIFO mode:0000 dev:316,0 ino:12539305 uid:57219 gid:205 size:0
              O_RDWR
           1: S_IFIFO mode:0000 dev:316,0 ino:12539306 uid:57219 gid:205 size:0
              O_RDWR
           2: S_IFIFO mode:0000 dev:316,0 ino:12539307 uid:57219 gid:205 size:0
              O_RDWR
        1024: S_IFREG mode:0644 dev:271,0 ino:93892 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1025: S_IFREG mode:0644 dev:271,0 ino:93893 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1026: S_IFREG mode:0644 dev:271,0 ino:93894 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1027: S_IFREG mode:0644 dev:271,0 ino:93895 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1028: S_IFREG mode:0644 dev:271,0 ino:93896 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1029: S_IFREG mode:0644 dev:271,0 ino:93897 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1030: S_IFREG mode:0644 dev:271,0 ino:93898 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1031: S_IFREG mode:0644 dev:271,0 ino:93899 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1032: S_IFREG mode:0644 dev:271,0 ino:93900 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1033: S_IFREG mode:0644 dev:271,0 ino:93901 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1034: S_IFREG mode:0644 dev:271,0 ino:93902 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE



        EXPECTED VERSUS ACTUAL BEHAVIOR :
        EXPECTED -
        >pfiles 22761
        22761: /bin/bash
          Current rlimit: 8192 file descriptors
           0: S_IFIFO mode:0000 dev:316,0 ino:12545723 uid:57219 gid:205 size:0
              O_RDWR
           1: S_IFIFO mode:0000 dev:316,0 ino:12545724 uid:57219 gid:205 size:0
              O_RDWR
           2: S_IFIFO mode:0000 dev:316,0 ino:12545725 uid:57219 gid:205 size:0
              O_RDWR
        ACTUAL -
        pfiles 15686:
        15686: /bin/bash
          Current rlimit: 8192 file descriptors
           0: S_IFIFO mode:0000 dev:316,0 ino:12539305 uid:57219 gid:205 size:0
              O_RDWR
           1: S_IFIFO mode:0000 dev:316,0 ino:12539306 uid:57219 gid:205 size:0
              O_RDWR
           2: S_IFIFO mode:0000 dev:316,0 ino:12539307 uid:57219 gid:205 size:0
              O_RDWR
        1024: S_IFREG mode:0644 dev:271,0 ino:93892 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1025: S_IFREG mode:0644 dev:271,0 ino:93893 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1026: S_IFREG mode:0644 dev:271,0 ino:93894 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1027: S_IFREG mode:0644 dev:271,0 ino:93895 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1028: S_IFREG mode:0644 dev:271,0 ino:93896 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1029: S_IFREG mode:0644 dev:271,0 ino:93897 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1030: S_IFREG mode:0644 dev:271,0 ino:93898 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1031: S_IFREG mode:0644 dev:271,0 ino:93899 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1032: S_IFREG mode:0644 dev:271,0 ino:93900 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1033: S_IFREG mode:0644 dev:271,0 ino:93901 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE
        1034: S_IFREG mode:0644 dev:271,0 ino:93902 uid:57219 gid:205 size:0
              O_RDONLY|O_LARGEFILE



        REPRODUCIBILITY :
        This bug can be reproduced always.

        ---------- BEGIN SOURCE ----------
        import java.io.*;

        public class FileDescriptorTest
        {
          public static void main(String[] args)
            throws Exception
          {
            if (args.length != 1)
            {
              System.err.println("Usage: FileDescriptorTest <numfiles>");
              System.exit(1);
            }
            
            File[] files = new File[Integer.parseInt(args[0])];
            InputStream[] fileStreams = new FileInputStream[files.length];
            for (int i=0; i<files.length; i++)
            {
              files[i] = File.createTempFile("fdtest",null);
              files[i].deleteOnExit();
              fileStreams[i] = new FileInputStream(files[i]);
            }

            System.out.println(files.length + " files now open!");
            
            Runtime.getRuntime().exec("/bin/bash");
            
            System.out.println("Started child process");
            
            System.out.println("Sleeping 60 seconds");
            Thread.currentThread().sleep(60 * 1000);
            
          }
        }
        ---------- END SOURCE ----------

        CUSTOMER SUBMITTED WORKAROUND :
        None that I'm aware of.

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                • Assignee:
                  martin Martin Buchholz
                  Reporter:
                  jssunw Jitender S (Inactive)
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