How to get a list of file systems and their mount path?

This is a discussion on How to get a list of file systems and their mount path? within the Linux Programming forums, part of the Platform Specific Boards category; I want to be able to get a list of file systems and the path they're mounted just like the ...

  1. #1
    Mad OnionKnight's Avatar
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    How to get a list of file systems and their mount path?

    I want to be able to get a list of file systems and the path they're mounted just like the df program will print out, which reports disk usage. Is this possible with some POSIX.1 function or otherwise?
    I should add that it needs to work on a Solaris machine.
    Last edited by OnionKnight; 09-21-2008 at 12:25 PM.

  2. #2
    Cat without Hat CornedBee's Avatar
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    Read /proc/mounts. It contains this information.

    Much system information in Linux is presented via pseudo-files in pseudo-filesystems like procfs (/proc), sysfs (/sys) and to some degree the devices in /dev.
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    CornedBee

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    Mad OnionKnight's Avatar
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    There is no /proc/mounts on the machine that requires the program. I found out the mtab on it is /etc/mnttab so I suppose I could just parse that.

  4. #4
    and the Hat of Guessing tabstop's Avatar
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    The Solaris box I have access to has getmntent that goes through the mnttab file one by one, if that helps.

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    Cat without Hat CornedBee's Avatar
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    glibc implements it too, but it sounds only vaguely portable.
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    CornedBee

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    and the Hat of Guessing tabstop's Avatar
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    The problem didn't sound all that portable to start with, but yes.

  7. #7
    Cat without Hat CornedBee's Avatar
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    Well, portable between *nices. Mounting is a universal concept among those, though the way to acquire information about it is not.

    I think the most portable way would actually be to call /bin/mount without arguments and parse its output. I expect this command to be more consistent in its location than the /etc/mtab equivalent.

    Edit: I stand corrected. It's /sbin/mount under HP-UX. Also, the device and the mount point are reversed in its output. So that one is definitely not portable. It supports getmntent and related calls. However, like SysV, it stores the mount data in /etc/mnttab.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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