src/lxc/syscall_wrappers.h

   1 /* liblxcapi
   2  *
   3  * Copyright © 2018 Christian Brauner <christian.brauner@ubuntu.com>.
   4  * Copyright © 2018 Canonical Ltd.
   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 version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #ifndef __LXC_SYSCALL_WRAPPER_H
  21 #define __LXC_SYSCALL_WRAPPER_H
  22
  23 #ifndef _GNU_SOURCE
  24 #define _GNU_SOURCE 1
  25 #endif
  26 #include <asm/unistd.h>
  27 #include <linux/keyctl.h>
  28 #include <stdint.h>
  29 #include <sys/syscall.h>
  30 #include <sys/types.h>
  31 #include <unistd.h>
  32
  33 #include "config.h"
  34
  35 typedef int32_t key_serial_t;
  36
  37 #if !HAVE_KEYCTL
  38 static inline long __keyctl(int cmd, unsigned long arg2, unsigned long arg3,
  39                             unsigned long arg4, unsigned long arg5)
  40 {
  41 #ifdef __NR_keyctl
  42         return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
  43 #else
  44         errno = ENOSYS;
  45         return -1;
  46 #endif
  47 }
  48 #define keyctl __keyctl
  49 #endif
  50
  51 #if !HAVE_PIVOT_ROOT
  52 static int pivot_root(const char *new_root, const char *put_old)
  53 {
  54 #ifdef __NR_pivot_root
  55         return syscall(__NR_pivot_root, new_root, put_old);
  56 #else
  57         errno = ENOSYS;
  58         return -1;
  59 #endif
  60 }
  61 #else
  62 extern int pivot_root(const char *new_root, const char *put_old);
  63 #endif
  64
  65 #endif /* __LXC_SYSCALL_WRAPPER_H */