src/common/compat/clone.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; only version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA  02111-1307, USA.
  16  */
  17
  18 #ifndef _COMPAT_CLONE_H
  19 #define _COMPAT_CLONE_H
  20
  21 #ifdef __linux__
  22
  23 #include <sched.h>
  24
  25 static inline
  26 pid_t lttng_clone_files(int (*fn)(void *), void *child_stack, void *arg)
  27 {
  28         return clone(fn, child_stack, CLONE_FILES | SIGCHLD, arg);
  29 }
  30
  31 #elif defined(__FreeBSD__)
  32
  33 #include <unistd.h>
  34
  35 static inline
  36 pid_t lttng_clone_files(int (*fn)(void *), void *child_stack, void *arg)
  37 {
  38         pid_t pid;
  39
  40         pid = rfork(RFPROC | RFTHREAD);
  41         if (pid == 0) {
  42                 /* child */
  43                 int ret;
  44
  45                 ret = fn(arg);
  46                 exit(ret);
  47         } else if (pid > 0) {
  48                 /* parent */
  49                 /*
  50                  * Just return, the caller will wait for the child.
  51                  */
  52                 return pid;
  53         } else {
  54                 /* Error */
  55                 return pid;
  56         }
  57 }
  58
  59 #else
  60 #error "Please add support for your OS."
  61 #endif /* __linux__ , __FreeBSD__ */
  62
  63 #endif /* _COMPAT_CLONE_H */