Function fake_proc_cmdline 

fn fake_proc_cmdline(
    ctx: &Ctx,
    rest: &[u8],
    text: &[u8],
) -> Result<Option<i32>, i32>

Serves /proc/<pid>/cmdline as the process was started, without the loader the exec was retargeted at.

The kernel’s file names the dynamic loader’s alias, --argv0, the name and the program before the real arguments, or the shim loader’s alias, the program and its AT_EXECFN before the whole argv; ps, pgrep -f and programs reading their own command line expect the argv the tracee passed. A process in the no-ptrace trampoline, or one that rewrote its own argv, is left as is.

In the guest-stub restricted mode no loader is exec’d, so the kernel’s file is the vector the program was exec’d with, which is right but for a #! script: there the interpreter, its argument and the script recorded at the exec take the place of argv[0], as the kernel would show them.

Arguments

• ctx - Shared supervisor state.
• rest - The <pid> or <pid>/task/<tid> of the path.
• text - The file as the kernel gives it.

Returns

A descriptor on the rewritten copy, or None when the file carries no loader prefix.

Errors

An errno when the copy cannot be made.