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Fabien Cadet

The Linux kernel: System Calls | Andries Brouwer, online book, 2003 - 3 views

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Fabien Cadet

2006: Sysenter Based System Call Mechanism in Linux 2.6 | manugarg.com - 1 views

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Fabien Cadet

Why LD_LIBRARY_PATH is bad, by David Barr (2001) - 2 views

  • This list is prepended to the existing list of compiled-in loader paths for a given executable, and any system default loader paths.
  • For security reasons, LD_LIBRARY_PATH is ignored at runtime for executables that have their setuid or setgid bit set. This severely limits the usefulness of LD_LIBRARY_PATH.
  • SunOS 4.x uses major and minor revision numbers. If you have a library “Xt”, then it's named something like “libXt.so.4.10” (Major version 4, minor 10). If you update the library (to correct a bug, for example), you would install libX11.so.4.11 and applications would automatically use the new version.
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  • Linux, SunOS 5.x and most other SYSV variants use only major revision numbers. A library “Xt” is just named something like “libXt.so.4”.
  • Linux confuses things by generally using major/minor library file names, but always include a symlink that is the actual library path referenced. So, for example, a library “libXt.so.6” is actually a symlink to “libXt.so.6.0”.
  • The linker/loader actually looks for “libXt.so.6”.
  • run-time vs link-time paths
  • There's also LD_RUN_PATH which is an environment variable which acts to “ld” just like specifying -R.
Fabien Cadet

prog21: Tales of a Former Disassembly Addict - 1 views

  • In fact, generated code can be so ridiculous and verbose that I finally came up with an across-the-board solution which works for all compilers on all systems: I don't look at the disassembled output.
  • I still see people obsessed with picking a programming language that's at the top of the benchmarks, and they obsess over the timing results the way I used to obsess over disassembled listings. It's a dodge, a distraction...and it's irrelevant.
Fabien Cadet

2006-10: Resolving ELF Relocation Name / Symbols | EM_386 blog - 0 views

  • From the ELF 1.2 standard:"Relocation is the process of connecting symbolic references with symbolic definitions. For example, when a program calls a function, the associated call instruction must transfer control to the proper destination address at execution. In other words, relocatable files must have information that describes how to modify their section contents, thus allowing executable and shared object files to hold the right information for a process's program image. Relocation entries are these data."
Fabien Cadet

2016: Xcb, X11, Xlib, Wayland? [must-read] - 6 views

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