3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
5 // This program is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; version 2 of the License.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #define CTX_TAG "\ns_context: "
36 static volatile size_t bufsize=4097;
37 // TODO: is this really race-free?
38 size_t cur_bufsize = bufsize;
40 char status_name[ sizeof("/proc/01234/status") ];
41 char buf[cur_bufsize];
45 strcpy(status_name, "/proc/");
46 len = utilvserver_uint2str(status_name+sizeof("/proc/")-1,
47 sizeof(status_name)-sizeof("/proc//status")+1,
49 strcpy(status_name+sizeof("/proc/")+len-1, "/status");
51 fd = open(status_name, O_RDONLY);
52 if (fd==-1) return CTX_NOCTX;
54 len = read(fd, buf, cur_bufsize);
58 pos = strstr(buf, CTX_TAG);
59 else if (len!=(size_t)-1) {
60 bufsize = cur_bufsize * 2 - 1;
64 if (pos!=0) return atoi(pos+sizeof(CTX_TAG)-1);
65 else return CTX_NOCTX;
72 return getctx(getpid());