On 24.01.2010 21:57, Michael Hutchinson wrote:
Yes, native applications with access to main's argv[0] can achieve
it easily under Linux, but managed apps simply cannot access this
location. There is also no way that I know of to get a ptr to
this memory location from a native library, so p/invoke won't
help either.
You may want to file an enhancement request with Mono's bugzilla
stating that you wish a facility for *dynamically* changing
the process name.
I guess it's *possible* right now with Mono too. Instead of using the
"mono" executable to run the app, create a tiny native app that uses
libmono and the embedding interfaces to load and run the managed exe.
This native shim can capture argv[0] and expose it via a P/Invokeable
function.
Well, most people are moving towards managed languages because they
are already sick of C :)
Anyway, here is what's possible, modulo bugs due to the aforementioned
C sickness. The tricky part was how to expand argv[0].
Build instructions are on top of the C file.
Robert
/*
*
* gcc -Wall -o mymono mymono.c -Wl,--export-dynamic `pkg-config --libs mono`
* gmcs test.cs
* ./mymono test.exe
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* import from mono */
int mono_main (int argc, char** argv);
const int MAX_ARGV0 = 1024;
static char* original_argv0 = NULL;
void
set_process_command_line (char* line)
{
if (!(line && original_argv0))
return;
strncpy (original_argv0, line, MAX_ARGV0 - 1);
}
char*
get_process_command_line ()
{
return strdup (original_argv0);
}
static void
expand_command_line (char** argv)
{
char new_arg0[MAX_ARGV0];
char *file = argv [0];
char proc_file[4096];
int len;
memset (new_arg0, 'a', MAX_ARGV0);
new_arg0 [MAX_ARGV0 - 1] = 0;
argv [0] = new_arg0;
len = readlink ("/proc/self/exe", proc_file, sizeof (proc_file) - 1);
if (len != -1) {
proc_file [len] = 0;
file = proc_file;
}
/* export argv[0] (which is now /proc/self/exe) to the new process */
setenv ("MYMONO_ORIGINAL_ARGV0", file, 1);
execv (file, argv);
/* not reached */
perror("exec");
exit (1);
}
int
main (int argc, char** argv)
{
if (strlen (argv [0]) < MAX_ARGV0 - 1)
expand_command_line (argv);
original_argv0 = argv [0];
set_process_command_line (getenv ("MYMONO_ORIGINAL_ARGV0"));
/* pass control to mono */
return mono_main (argc, argv);
}
using System;
using System.Runtime.InteropServices;
class Programm
{
static void Main ()
{
Console.WriteLine (get_process_command_line ());
set_process_command_line ("rootkit");
Console.WriteLine (get_process_command_line ());
set_process_command_line ("rootkit rootkit");
Console.WriteLine (get_process_command_line ());
}
[DllImport("__Internal")]
static extern void set_process_command_line (string line);
[DllImport("__Internal")]
static extern string get_process_command_line ();
}
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