[lldb-dev] Accessing attached process environment variables with SBAPI

[Jim Ingham via lldb-dev]

The SBEnvironment classes and the setting for the environment are currently used just for launching processes.  lldb doesn’t keep track of the “live” state of the environment in a process - which can change as the program runs.  It would certainly be useful to have a “printenv” function in lldb that fetched the current process environment, however.  Please file an enhancement request or propose a patch.

Jim


> On Jan 28, 2022, at 4:35 PM, Ivan Hernandez via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> 
> Hi all,
> 
> I'm trying to read the value of an environment variable that a process was launched with but to which lldb attached to after it launched. SBEnvironment looked interesting but I tried using 
> ```
> script print(lldb.debugger.GetSelectedTarget().GetEnvironment().Get("PRINT_ME")
> ```
> and that prints 'None'. 
> 
> I am able to get the value using
> ```
> script addr = lldb.debugger.GetSelectedTarget().EvaluateExpression("(char *)getenv(\"PRINT_ME\")").GetValueAsUnsigned()
> script err = lldb.SBError()
> script print(lldb.debugger.GetSelectedTarget().GetProcess().ReadCStringFromMemory(addr, 1024, err))
> ```
> but that seems like overkill for reading an environment variable. Is there a better way to do this that I'm missing?
> 
> I'm using the following program to quickly test things:
> ```
> #include <stdio.h>
> #include <signal.h>
> #include <stdlib.h>
> int main() {
>   raise(SIGSTOP);
>   printf("%s\n", getenv("PRINT_ME"));
> }
> ```
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