I want to read an environment variable value of a running process from /proc
file system.
I could not find /proc/<pid>/environ
file on QNX.
I know how we can read it from getenv API but I want to read it from /proc/<pid>
.
How to read environment variables value from /proc file system in QNX?
168 views Asked by Arun Nishad At
1
There are 1 answers
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To the best of my knowledge there's no easy-to-use API on QNX for accessing another program's environment programmatically.
If your application permits, the easiest solution is to use QNX's
pidin
-- runpidin -p <pid> environment
to dump the environment to the standard output.If you cannot spawn additional processes, what I believe
pidin
is doing internally is something like:DCMD_PROC_INFO
to retrive the virtual address of the initial stack of the target process;/proc/<pid>/as
, seek to the inital stack address, and parse through it:argc
argv
, so skip past that many char*s, plus one