daemon/proctitle.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * LADI Session Handler (ladish)
   4  *
   5  * Copyright (C) 2008 Nedko Arnaudov <nedko@arnaudov.name>
   6  *
   7  **************************************************************************
   8  * This file contains the code that sets process "title"
   9  **************************************************************************
  10  *
  11  * LADI Session Handler is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * LADI Session Handler is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
  23  * or write to the Free Software Foundation, Inc.,
  24  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 /* This implementation should work on Linux, on FreeBSD we could use setprotitile(3) */
  28
  29 #include <stdarg.h>
  30 #include <string.h>
  31
  32 #include "../common/debug.h"
  33
  34 static char * g_argv_begin;
  35 static char * g_argv_end;
  36
  37 void
  38 lash_init_setproctitle(
  39   int argc,
  40   char ** argv,
  41   char ** envp)
  42 {
  43   char * last_arg;
  44
  45   g_argv_begin = argv[0];
  46
  47   last_arg = argv[argc-1];
  48
  49   g_argv_end = last_arg + strlen(last_arg);
  50
  51   //lash_info("%u chars available for title", g_argv_end - g_argv_begin);
  52 }
  53
  54 void
  55 lash_setproctitile(
  56   const char * format,
  57   ...)
  58 {
  59   va_list ap;
  60
  61   va_start(ap, format);
  62
  63   memset(g_argv_begin, 0, g_argv_end - g_argv_begin);
  64
  65   vsnprintf(g_argv_begin, g_argv_end - g_argv_begin, format, ap);
  66
  67   va_end(ap);
  68 }