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 <sched.h>
  29 #include <stdint.h>
  30 #include <sys/syscall.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33
  34 #include "config.h"
  35
  36 #ifdef HAVE_LINUX_MEMFD_H
  37 #include <linux/memfd.h>
  38 #endif
  39
  40 typedef int32_t key_serial_t;
  41
  42 #if !HAVE_KEYCTL
  43 static inline long __keyctl(int cmd, unsigned long arg2, unsigned long arg3,
  44                             unsigned long arg4, unsigned long arg5)
  45 {
  46 #ifdef __NR_keyctl
  47         return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
  48 #else
  49         errno = ENOSYS;
  50         return -1;
  51 #endif
  52 }
  53 #define keyctl __keyctl
  54 #endif
  55
  56 #ifndef HAVE_MEMFD_CREATE
  57 static inline int memfd_create(const char *name, unsigned int flags) {
  58         #ifndef __NR_memfd_create
  59                 #if defined __i386__
  60                         #define __NR_memfd_create 356
  61                 #elif defined __x86_64__
  62                         #define __NR_memfd_create 319
  63                 #elif defined __arm__
  64                         #define __NR_memfd_create 385
  65                 #elif defined __aarch64__
  66                         #define __NR_memfd_create 279
  67                 #elif defined __s390__
  68                         #define __NR_memfd_create 350
  69                 #elif defined __powerpc__
  70                         #define __NR_memfd_create 360
  71                 #elif defined __sparc__
  72                         #define __NR_memfd_create 348
  73                 #elif defined __blackfin__
  74                         #define __NR_memfd_create 390
  75                 #elif defined __ia64__
  76                         #define __NR_memfd_create 1340
  77                 #elif defined _MIPS_SIM
  78                         #if _MIPS_SIM == _MIPS_SIM_ABI32
  79                                 #define __NR_memfd_create 4354
  80                         #endif
  81                         #if _MIPS_SIM == _MIPS_SIM_NABI32
  82                                 #define __NR_memfd_create 6318
  83                         #endif
  84                         #if _MIPS_SIM == _MIPS_SIM_ABI64
  85                                 #define __NR_memfd_create 5314
  86                         #endif
  87                 #endif
  88         #endif
  89         #ifdef __NR_memfd_create
  90         return syscall(__NR_memfd_create, name, flags);
  91         #else
  92         errno = ENOSYS;
  93         return -1;
  94         #endif
  95 }
  96 #else
  97 extern int memfd_create(const char *name, unsigned int flags);
  98 #endif
  99
 100 #if !HAVE_PIVOT_ROOT
 101 static int pivot_root(const char *new_root, const char *put_old)
 102 {
 103 #ifdef __NR_pivot_root
 104         return syscall(__NR_pivot_root, new_root, put_old);
 105 #else
 106         errno = ENOSYS;
 107         return -1;
 108 #endif
 109 }
 110 #else
 111 extern int pivot_root(const char *new_root, const char *put_old);
 112 #endif
 113
 114 #if !defined(__NR_setns) && !defined(__NR_set_ns)
 115         #if defined(__x86_64__)
 116                 #define __NR_setns 308
 117         #elif defined(__i386__)
 118                 #define __NR_setns 346
 119         #elif defined(__arm__)
 120                 #define __NR_setns 375
 121         #elif defined(__aarch64__)
 122                 #define __NR_setns 375
 123         #elif defined(__powerpc__)
 124                 #define __NR_setns 350
 125         #elif defined(__s390__)
 126                 #define __NR_setns 339
 127         #endif
 128 #endif
 129
 130 /* Define sethostname() if missing from the C library */
 131 #ifndef HAVE_SETHOSTNAME
 132 static inline int sethostname(const char *name, size_t len)
 133 {
 134 #ifdef __NR_sethostname
 135         return syscall(__NR_sethostname, name, len);
 136 #else
 137         errno = ENOSYS;
 138         return -1;
 139 #endif
 140 }
 141 #endif
 142
 143 /* Define setns() if missing from the C library */
 144 #ifndef HAVE_SETNS
 145 static inline int setns(int fd, int nstype)
 146 {
 147 #ifdef __NR_setns
 148         return syscall(__NR_setns, fd, nstype);
 149 #elif defined(__NR_set_ns)
 150         return syscall(__NR_set_ns, fd, nstype);
 151 #else
 152         errno = ENOSYS;
 153         return -1;
 154 #endif
 155 }
 156 #endif
 157
 158 #endif /* __LXC_SYSCALL_WRAPPER_H */