What's All This about ELF? glibc?

This article is from the Frequently Asked Questions for Linux, the Free/Open Source UNIX-like operating system kernel that runs on many modern computer systems. Maintained by David C. Merrill with numerous contributions by others. (v1.0).See the ELF HOWTO by Daniel Barlow. Note that this is not the file move-to-elf, which is a blow-by-blow account of how to upgrade to ELF manually. Linux has two different formats for executables, object files, and object code libraries, known as, "ELF". (The old format is called "a.out".) They have advantages, including better support for shared libraries and dynamic linking. Both a.out and ELF binaries can coexist on a system. However, they use different shared C libraries, both of which have to be installed. If you want to find out whether your system...

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How Do I Upgrade the Libraries without Trashing the System?

This article is from the Frequently Asked Questions for Linux, the Free/Open Source UNIX-like operating system kernel that runs on many modern computer systems. Maintained by David C. Merrill with numerous contributions by others. (v1.0).Warning You should always have a rescue disk set ready when you perform this procedure, in the likely event that something goes wrong!This procedure is especially difficult if you're upgrading very old libraries like libc4. But you should be able to keep libc4 on the same system with libc5 libraries for the programs that still need them. The same holds true for upgrading from libc5 to the newer-yet glibc2 libraries.The problem with upgrading dynamic libraries is that the moment you remove the old libraries, the utilities that you need to upgrade to the new...

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What Is ld.so and How Do I Get It?

This article is from the Frequently Asked Questions for Linux, the Free/Open Source UNIX-like operating system kernel that runs on many modern computer systems. Maintained by David C. Merrill with numerous contributions by others. (v1.0). ld.so is the dynamic library loader. Each binary using shared libraries used to have about 3K of start-up code to find and load the shared libraries. Now that code has been put in a special shared library, /lib/ld.so, where all binaries can look for it, so that it wastes less disk space, and can be upgraded more easily.ld.so can be obtained from http://tsx-11.mit.edu/pub/linux/packages/GCC/ and mirror sites. The latest version at the time of writing is ld.so.1.9.5.tar.gz./lib/ld-linux.so.1 is the same thing for ELF ("What's all this about ELF? ") and comes...

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Where Can I Find Linux System Specifications?

This article is from the Frequently Asked Questions for Linux, the Free/Open Source UNIX-like operating system kernel that runs on many modern computer systems. Maintained by David C. Merrill with numerous contributions by others. (v1.0).As a start, look at the Linux Standards Base, http://www.linuxbase.org. The site contains information about test software, file system organization, and shared library naming conventions. ...

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Where Can I Find Linux System Specifications?

This article is from the Frequently Asked Questions for Linux, the Free/Open Source UNIX-like operating system kernel that runs on many modern computer systems. Maintained by David C. Merrill with numerous contributions by others. (v1.0).As a start, look at the Linux Standards Base, http://www.linuxbase.org. The site contains information about test software, file system organization, and shared library naming conventions. ...

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How Do I Add Temporary Swap Space?

This article is from the Frequently Asked Questions for Linux, the Free/Open Source UNIX-like operating system kernel that runs on many modern computer systems. Maintained by David C. Merrill with numerous contributions by others. (v1.0).In addition to a swap partition, Linux can also use a swap file. Some programs, like g++, can use huge amounts of virtual memory, requiring the temporary creation of extra space. To install an extra 64 MB of swap space, for example, use the following shell commands: # dd if=/dev/zero of=/swap bs=1024 count=65535 # mkswap /swap # swapon /swap The count= argument to dd determines how big the swap file will...

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Why Isn't My Virtual Memory Swap Area Working?

This article is from the Frequently Asked Questions for Linux, the Free/Open Source UNIX-like operating system kernel that runs on many modern computer systems. Maintained by David C. Merrill with numerous contributions by others. (v1.0).When you boot (or enable swapping manually) you should see Adding Swap: NNNNk swap-space If you don't see any messages at all you are probably missingswapon -av(the command to enable swapping) in your /etc/rc.local or /etc/rc.d/* (the system startup scripts), or have forgotten to make the right entry in /etc/ fstab:/dev/hda2 none swap sw for example.If you see:Unable to find swap-space signature you have forgotten to run mkswap. See the manual page for details; it works much like mkfs.Running the command free, in addition to showing free memory,...

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