insmod problems

This is a discussion on insmod problems within the Linux Programming forums, part of the Platform Specific Boards category; I noticed something really weird about insmod.. Code: $su Password: VCC_SRC_HOME = /root/VCC2 [root@sarayu tipc_demo-1.15]# which insmod /usr/bin/which: no insmod ...

  1. #1
    Eager young mind
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    insmod problems

    I noticed something really weird about insmod..

    Code:
    $su
    Password:
    VCC_SRC_HOME = /root/VCC2
    [root@sarayu tipc_demo-1.15]# which insmod
    /usr/bin/which: no insmod in (/root/VCC2-Deps/java/jdk1.6.0_01/bin:/root/VCC2-Deps/ant/apache-ant-1.6.2/bin:/root/VCC2-Deps/java/jwsdp-1.5.0/jaxb/bin:/root/VCC2-Deps/JacORB/JacORB_1_4_1/bin:/root/VCC2-Deps/aspectj/aspectj1.5/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/home/chaitanya/bin)
    [root@sarayu tipc_demo-1.15]# exit
    exit
    and
    Code:
     $su -
    Password:
    VCC_SRC_HOME = /root/VCC2
    [root@sarayu ~]# which insmod
    /sbin/insmod

    In the first case , i logged in as su without the -l option and insmod failed to work. In the second case, with the -l option, it worked. What is going on here?
    In the middle of difficulty, lies opportunity

  2. #2
    and the hat of wrongness Salem's Avatar
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    Read the man page for su and find out what that option does.

    You can also try
    echo $PATH
    in both cases.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
    Eager young mind
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    OK. I noticed the difference in the paths and I concluded that the location from where i call insmod should not matter. But the problem is due to the actions performed by the login shell right? So, insmod can never be successfully called without logging into the login shell is it?
    In the middle of difficulty, lies opportunity

  4. #4
    and the hat of wrongness Salem's Avatar
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    If you specify the full path to it, yes.

    Eg
    # /sbin/insmod
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #5
    Eager young mind
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    Things seem to get weirder by the minute...
    I am trying to install TIPC - 1.5.12 on this comp. Now, i can get insmod to work. But, when I try to use insmod to insert the module that i want to insert to the kernel, i get the message saying
    "insmod: error inserting 'tipc.ko': -1 Invalid module format"
    This is the file that has to be inserted according to the documentation in :
    http://tipc.sourceforge.net/doc/Users_Guide.txt
    In the middle of difficulty, lies opportunity

  6. #6
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    >If you specify the full path to it, yes.
    Yeah. figured that out ..
    In the middle of difficulty, lies opportunity

  7. #7
    Eager young mind
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    If this can help in some way :
    Code:
     $ modinfo tipc.ko 
    filename: tipc.ko 
    description: TIPC: Transparent Inter Process Communication 
    license: Dual BSD/GPL 
    version: 1.5.12 
    vermagic: 2.6.11-1.1369_FC4 686 REGPARM 4KSTACKS gcc-4.0 
    depends: 
    srcversion: 63E59CA197A5130BF0BD26A
    Last edited by kris.c; 05-22-2007 at 06:44 AM.
    In the middle of difficulty, lies opportunity

  8. #8
    Eager young mind
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    insmod is working for now. I booted the default, non-smp FC-4 kernel. That is sorted out for the time being.
    One conceptual doubt though, when i do insmod on tipc.ko, the kernel object is supposed to be inserted into the kernel module right? Does this mean, say a "tipc.h" file is actually put into the dir : /usr/src/kernel/2.6.11-1.1369_FC4-i686/include/net?
    In the middle of difficulty, lies opportunity

  9. #9
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    No, no header file needs to be installed.

    You can't insert any module into any kernel. Make sure that the module you are trying to insert was compiled for YOUR kernel version. Otherwise, it will be rejected, as sort of a safety feature to prevent compatibility problems.

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