How to check a execute file is 64 bit in linux?

Question

I like understand a execute file is 64 bit or no. I want to understand a run process in Linux is 64 bit or 32 bit with c++. I do not want to use "file" command. for example: File -L bash

The answer is a bit unclear. You want to detect whether a file in the filesystem is a 32/64 executable? Or detect whether your own process will be 32/64? — David Rodríguez - dribeas, Sep 16 '13 at 04:30
possible duplicate of [Detecting 64bit compile in C](http://stackoverflow.com/questions/5272825/detecting-64bit-compile-in-c) — devnull, Sep 16 '13 at 04:39
Also check [this](http://stackoverflow.com/questions/1505582/determining-32-vs-64-bit-in-c) — devnull, Sep 16 '13 at 04:39

score 5 · Answer 1 · answered Sep 16 '13 at 04:33

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You need to parse the elf header. You can write your own parser, or use a dedicated library such as this one: http://elfio.sourceforge.net/

answered Sep 16 '13 at 04:33

stdcall

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thanks but i need a simple way for example use proc directory. – user2760718 Sep 16 '13 at 04:38
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Did you even look at that library? It couldn't be simpler. – Retired Ninja Sep 16 '13 at 04:51
Just parse the ELF header of `/proc/$PID/exe` – Basile Starynkevitch Sep 16 '13 at 05:09

score 2 · Accepted Answer · answered Sep 16 '13 at 08:53

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you should use elfio lib. this is a link for that: (http://elfio.sourceforge.net)

answered Sep 16 '13 at 08:53

hamed

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Rather than checking the binary, you can at compile time determine the result by using preprocessor macros expanded by the compiler. See the linked questions marked as duplicate. – David Rodríguez - dribeas Sep 16 '13 at 13:25

score 0 · Answer 3 · edited Aug 18 '15 at 04:42

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you can use: readelf -h <executable file name>

edited Aug 18 '15 at 04:42

SamB

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answered Aug 18 '15 at 03:50

shulianghe

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How to check a execute file is 64 bit in linux?

3 Answers3