How to tell if linux process is 64bit
Solution 1:
You can use file to get that information:
For example:
chris@obsidian:~$ file /usr/bin/perl
/usr/bin/perl: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), for GNU/Linux 2.6.8, dynamically linked (uses shared libs), stripped
or read from /proc/
chris@obsidian:~$ file -L /proc/[PID]/exe
/proc/[PID]/exe: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.8, dynamically linked (uses shared libs), stripped
This will tell you if it is 64 or 32-bit.
Solution 2:
Starting from the PID you can:
file -L /proc/PID/exe