[mirror_lxc.git] / src / lxc / syscall_wrappers.h

/* liblxcapi
 *
 * Copyright © 2018 Christian Brauner <christian.brauner@ubuntu.com>.
 * Copyright © 2018 Canonical Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef __LXC_SYSCALL_WRAPPER_H
#define __LXC_SYSCALL_WRAPPER_H

#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <asm/unistd.h>
#include <linux/keyctl.h>
#include <sched.h>
#include <stdint.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#include "config.h"

#ifdef HAVE_LINUX_MEMFD_H
#include <linux/memfd.h>
#endif

typedef int32_t key_serial_t;

#if !HAVE_KEYCTL
static inline long __keyctl(int cmd, unsigned long arg2, unsigned long arg3,
			    unsigned long arg4, unsigned long arg5)
{
#ifdef __NR_keyctl
	return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
#else
	errno = ENOSYS;
	return -1;
#endif
}
#define keyctl __keyctl
#endif

#ifndef HAVE_MEMFD_CREATE
static inline int memfd_create(const char *name, unsigned int flags) {
	#ifndef __NR_memfd_create
		#if defined __i386__
			#define __NR_memfd_create 356
		#elif defined __x86_64__
			#define __NR_memfd_create 319
		#elif defined __arm__
			#define __NR_memfd_create 385
		#elif defined __aarch64__
			#define __NR_memfd_create 279
		#elif defined __s390__
			#define __NR_memfd_create 350
		#elif defined __powerpc__
			#define __NR_memfd_create 360
		#elif defined __sparc__
			#define __NR_memfd_create 348
		#elif defined __blackfin__
			#define __NR_memfd_create 390
		#elif defined __ia64__
			#define __NR_memfd_create 1340
		#elif defined _MIPS_SIM
			#if _MIPS_SIM == _MIPS_SIM_ABI32
				#define __NR_memfd_create 4354
			#endif
			#if _MIPS_SIM == _MIPS_SIM_NABI32
				#define __NR_memfd_create 6318
			#endif
			#if _MIPS_SIM == _MIPS_SIM_ABI64
				#define __NR_memfd_create 5314
			#endif
		#endif
	#endif
	#ifdef __NR_memfd_create
	return syscall(__NR_memfd_create, name, flags);
	#else
	errno = ENOSYS;
	return -1;
	#endif
}
#else
extern int memfd_create(const char *name, unsigned int flags);
#endif

#if !HAVE_PIVOT_ROOT
static int pivot_root(const char *new_root, const char *put_old)
{
#ifdef __NR_pivot_root
	return syscall(__NR_pivot_root, new_root, put_old);
#else
	errno = ENOSYS;
	return -1;
#endif
}
#else
extern int pivot_root(const char *new_root, const char *put_old);
#endif

#if !defined(__NR_setns) && !defined(__NR_set_ns)
	#if defined(__x86_64__)
		#define __NR_setns 308
	#elif defined(__i386__)
		#define __NR_setns 346
	#elif defined(__arm__)
		#define __NR_setns 375
	#elif defined(__aarch64__)
		#define __NR_setns 375
	#elif defined(__powerpc__)
		#define __NR_setns 350
	#elif defined(__s390__)
		#define __NR_setns 339
	#endif
#endif

/* Define sethostname() if missing from the C library */
#ifndef HAVE_SETHOSTNAME
static inline int sethostname(const char *name, size_t len)
{
#ifdef __NR_sethostname
	return syscall(__NR_sethostname, name, len);
#else
	errno = ENOSYS;
	return -1;
#endif
}
#endif

/* Define setns() if missing from the C library */
#ifndef HAVE_SETNS
static inline int setns(int fd, int nstype)
{
#ifdef __NR_setns
	return syscall(__NR_setns, fd, nstype);
#elif defined(__NR_set_ns)
	return syscall(__NR_set_ns, fd, nstype);
#else
	errno = ENOSYS;
	return -1;
#endif
}
#endif

/* Define unshare() if missing from the C library */
#ifndef HAVE_UNSHARE
static inline int unshare(int flags)
{
#ifdef __NR_unshare
	return syscall(__NR_unshare, flags);
#else
	errno = ENOSYS;
	return -1;
#endif
}
#else
extern int unshare(int);
#endif

#endif /* __LXC_SYSCALL_WRAPPER_H */
Commit	Line	Data
b25291da CB	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>
59524108	28	#include <sched.h>
b25291da CB	29	#include <stdint.h>
	30	#include <sys/syscall.h>
	31	#include <sys/types.h>
	32	#include <unistd.h>
	33
	34	#include "config.h"
	35
6a886ddf CB	36	#ifdef HAVE_LINUX_MEMFD_H
	37	#include <linux/memfd.h>
	38	#endif
	39
b25291da CB	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
6a886ddf CB	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
6b3d24d7 CB	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
59524108 CB	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
364932cf CB	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
59524108 CB	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
e8f764b6 CB	158	/* Define unshare() if missing from the C library */
	159	#ifndef HAVE_UNSHARE
	160	static inline int unshare(int flags)
	161	{
	162	#ifdef __NR_unshare
	163	return syscall(__NR_unshare, flags);
	164	#else
	165	errno = ENOSYS;
	166	return -1;
	167	#endif
	168	}
	169	#else
	170	extern int unshare(int);
	171	#endif
	172
b25291da	173	#endif /* __LXC_SYSCALL_WRAPPER_H */