1 /* Linux-specific PROCFS manipulation routines.
2    Copyright (C) 2009-2012 Free Software Foundation, Inc.
3 
4    This file is part of GDB.
5 
6    This program is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 3 of the License, or
9    (at your option) any later version.
10 
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15 
16    You should have received a copy of the GNU General Public License
17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
18 
19 #ifdef GDBSERVER
20 #include "server.h"
21 #else
22 #include "defs.h"
23 #include "gdb_string.h"
24 #endif
25 
26 #include "linux-procfs.h"
27 
28 /* Return the TGID of LWPID from /proc/pid/status.  Returns -1 if not
29    found.  */
30 
31 int
32 linux_proc_get_tgid (int lwpid)
33 {
34   FILE *status_file;
35   char buf[100];
36   int tgid = -1;
37 
38   snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid);
39   status_file = fopen (buf, "r");
40   if (status_file != NULL)
41     {
42       while (fgets (buf, sizeof (buf), status_file))
43 	{
44 	  if (strncmp (buf, "Tgid:", 5) == 0)
45 	    {
46 	      tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10);
47 	      break;
48 	    }
49 	}
50 
51       fclose (status_file);
52     }
53 
54   return tgid;
55 }
56