--- /dev/null
+// $Id$ --*- c++ -*--
+
+// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; version 2 of the License.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "vserver.h"
+#include "internal.h"
+#include <string.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#define CTX_TAG "\ns_context: "
+
+ctx_t
+getctx(pid_t pid)
+{
+ static volatile size_t bufsize=4097;
+ // TODO: is this really race-free?
+ size_t cur_bufsize = bufsize;
+ int fd;
+ char status_name[ sizeof("/proc/01234/status") ];
+ char buf[cur_bufsize];
+ size_t len;
+ char *pos = 0;
+
+ strcpy(status_name, "/proc/");
+ len = utilvserver_uint2str(status_name+sizeof("/proc/")-1,
+ sizeof(status_name)-sizeof("/proc//status")+1,
+ pid, 10);
+ strcpy(status_name+sizeof("/proc/")+len-1, "/status");
+
+ fd = open(status_name, O_RDONLY);
+ if (fd==-1) return CTX_NOCTX;
+
+ len = read(fd, buf, cur_bufsize);
+ close(fd);
+
+ if (len<cur_bufsize)
+ pos = strstr(buf, CTX_TAG);
+ else if (len!=(size_t)-1) {
+ bufsize = cur_bufsize * 2 - 1;
+ errno = EAGAIN;
+ }
+
+ if (pos!=0) return atoi(pos+sizeof(CTX_TAG)-1);
+ else return CTX_NOCTX;
+}
+
+#if 0
+ctx_t
+getcctx()
+{
+ return getctx(getpid());
+}
+#endif