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macro.h
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macro.h
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/* SPDX-License-Identifier: LGPL-2.1+ */
#ifndef __LXC_MACRO_H
#define __LXC_MACRO_H
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#define __STDC_FORMAT_MACROS
#include <asm/types.h>
#include <limits.h>
#include <linux/if_link.h>
#include <linux/loop.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/types.h>
#include <stdint.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
#ifndef MAX_GRBUF_SIZE
#define MAX_GRBUF_SIZE 2097152
#endif
#define INT64_FMT "%" PRId64
/* Define __S_ISTYPE if missing from the C library. */
#ifndef __S_ISTYPE
#define __S_ISTYPE(mode, mask) (((mode)&S_IFMT) == (mask))
#endif
/* capabilities */
#ifndef CAP_CHOWN
#define CAP_CHOWN 0
#endif
#ifndef CAP_DAC_OVERRIDE
#define CAP_DAC_OVERRIDE 1
#endif
#ifndef CAP_DAC_READ_SEARCH
#define CAP_DAC_READ_SEARCH 2
#endif
#ifndef CAP_FOWNER
#define CAP_FOWNER 3
#endif
#ifndef CAP_FSETID
#define CAP_FSETID 4
#endif
#ifndef CAP_KILL
#define CAP_KILL 5
#endif
#ifndef CAP_SETGID
#define CAP_SETGID 6
#endif
#ifndef CAP_SETUID
#define CAP_SETUID 7
#endif
#ifndef CAP_SETPCAP
#define CAP_SETPCAP 8
#endif
#ifndef CAP_LINUX_IMMUTABLE
#define CAP_LINUX_IMMUTABLE 9
#endif
#ifndef CAP_NET_BIND_SERVICE
#define CAP_NET_BIND_SERVICE 10
#endif
#ifndef CAP_NET_BROADCAST
#define CAP_NET_BROADCAST 11
#endif
#ifndef CAP_NET_ADMIN
#define CAP_NET_ADMIN 12
#endif
#ifndef CAP_NET_RAW
#define CAP_NET_RAW 13
#endif
#ifndef CAP_IPC_LOCK
#define CAP_IPC_LOCK 14
#endif
#ifndef CAP_IPC_OWNER
#define CAP_IPC_OWNER 15
#endif
#ifndef CAP_SYS_MODULE
#define CAP_SYS_MODULE 16
#endif
#ifndef CAP_SYS_RAWIO
#define CAP_SYS_RAWIO 17
#endif
#ifndef CAP_SYS_CHROOT
#define CAP_SYS_CHROOT 18
#endif
#ifndef CAP_SYS_PTRACE
#define CAP_SYS_PTRACE 19
#endif
#ifndef CAP_SYS_PACCT
#define CAP_SYS_PACCT 20
#endif
#ifndef CAP_SYS_ADMIN
#define CAP_SYS_ADMIN 21
#endif
#ifndef CAP_SYS_BOOT
#define CAP_SYS_BOOT 22
#endif
#ifndef CAP_SYS_NICE
#define CAP_SYS_NICE 23
#endif
#ifndef CAP_SYS_RESOURCE
#define CAP_SYS_RESOURCE 24
#endif
#ifndef CAP_SYS_TIME
#define CAP_SYS_TIME 25
#endif
#ifndef CAP_SYS_TTY_CONFIG
#define CAP_SYS_TTY_CONFIG 26
#endif
#ifndef CAP_MKNOD
#define CAP_MKNOD 27
#endif
#ifndef CAP_LEASE
#define CAP_LEASE 28
#endif
#ifndef CAP_AUDIT_WRITE
#define CAP_AUDIT_WRITE 29
#endif
#ifndef CAP_AUDIT_CONTROL
#define CAP_AUDIT_CONTROL 30
#endif
#ifndef CAP_SETFCAP
#define CAP_SETFCAP 31
#endif
#ifndef CAP_MAC_OVERRIDE
#define CAP_MAC_OVERRIDE 32
#endif
#ifndef CAP_MAC_ADMIN
#define CAP_MAC_ADMIN 33
#endif
#ifndef CAP_SYSLOG
#define CAP_SYSLOG 34
#endif
#ifndef CAP_WAKE_ALARM
#define CAP_WAKE_ALARM 35
#endif
#ifndef CAP_BLOCK_SUSPEND
#define CAP_BLOCK_SUSPEND 36
#endif
#ifndef CAP_AUDIT_READ
#define CAP_AUDIT_READ 37
#endif
#ifndef CAP_PERFMON
#define CAP_PERFMON 38
#endif
#ifndef CAP_BPF
#define CAP_BPF 39
#endif
#ifndef CAP_CHECKPOINT_RESTORE
#define CAP_CHECKPOINT_RESTORE 40
#endif
/* prctl */
#ifndef PR_CAPBSET_READ
#define PR_CAPBSET_READ 23
#endif
#ifndef PR_CAPBSET_DROP
#define PR_CAPBSET_DROP 24
#endif
/* Control the ambient capability set */
#ifndef PR_CAP_AMBIENT
#define PR_CAP_AMBIENT 47
#endif
#ifndef PR_CAP_AMBIENT_IS_SET
#define PR_CAP_AMBIENT_IS_SET 1
#endif
#ifndef PR_CAP_AMBIENT_RAISE
#define PR_CAP_AMBIENT_RAISE 2
#endif
#ifndef PR_CAP_AMBIENT_LOWER
#define PR_CAP_AMBIENT_LOWER 3
#endif
#ifndef PR_CAP_AMBIENT_CLEAR_ALL
#define PR_CAP_AMBIENT_CLEAR_ALL 4
#endif
#ifndef PR_SET_NO_NEW_PRIVS
#define PR_SET_NO_NEW_PRIVS 38
#endif
#ifndef PR_GET_NO_NEW_PRIVS
#define PR_GET_NO_NEW_PRIVS 39
#endif
/* filesystem magic values */
#ifndef CGROUP_SUPER_MAGIC
#define CGROUP_SUPER_MAGIC 0x27e0eb
#endif
#ifndef CGROUP2_SUPER_MAGIC
#define CGROUP2_SUPER_MAGIC 0x63677270
#endif
#ifndef NSFS_MAGIC
#define NSFS_MAGIC 0x6e736673
#endif
/* current overlayfs */
#ifndef OVERLAY_SUPER_MAGIC
#define OVERLAY_SUPER_MAGIC 0x794c7630
#endif
/* legacy overlayfs */
#ifndef OVERLAYFS_SUPER_MAGIC
#define OVERLAYFS_SUPER_MAGIC 0x794c764f
#endif
/* Calculate the number of chars needed to represent a given integer as a C
* string. Include room for '-' to indicate negative numbers and the \0 byte.
* This is based on systemd.
*/
#define INTTYPE_TO_STRLEN(type) \
(2 + (sizeof(type) <= 1 \
? 3 \
: sizeof(type) <= 2 \
? 5 \
: sizeof(type) <= 4 \
? 10 \
: sizeof(type) <= 8 \
? 20 \
: sizeof(int[-2 * (sizeof(type) > 8)])))
/* Useful macros */
#define LXC_LINELEN 4096
#define LXC_IDMAPLEN 4096
#define LXC_MAX_BUFFER 4096
#define LXC_NAMESPACE_NAME_MAX 256
/* /proc/ = 6
* +
* <pid-as-str> = INTTYPE_TO_STRLEN(pid_t)
* +
* /fd/ = 4
* +
* <fd-as-str> = INTTYPE_TO_STRLEN(int)
* +
* \0 = 1
*/
#define LXC_PROC_PID_FD_LEN \
(6 + INTTYPE_TO_STRLEN(pid_t) + 4 + INTTYPE_TO_STRLEN(int) + 1)
/* /proc/ = 6
* +
* <pid-as-str> = INTTYPE_TO_STRLEN(pid_t)
* +
* /status = 7
* +
* \0 = 1
*/
#define LXC_PROC_STATUS_LEN (6 + INTTYPE_TO_STRLEN(pid_t) + 7 + 1)
/* /proc/ = 6
* +
* <pid-as-str> = INTTYPE_TO_STRLEN(pid_t)
* +
* /attr/ = 6
* +
* /current = 8
* +
* \0 = 1
*/
#define LXC_LSMATTRLEN (6 + INTTYPE_TO_STRLEN(pid_t) + 6 + 8 + 1)
#define LXC_CMD_DATA_MAX (PATH_MAX * 2)
/* loop devices */
#ifndef LO_FLAGS_AUTOCLEAR
#define LO_FLAGS_AUTOCLEAR 4
#endif
#ifndef LOOP_CTL_GET_FREE
#define LOOP_CTL_GET_FREE 0x4C82
#endif
/* memfd_create() */
#ifndef MFD_CLOEXEC
#define MFD_CLOEXEC 0x0001U
#endif
#ifndef MFD_ALLOW_SEALING
#define MFD_ALLOW_SEALING 0x0002U
#endif
/**
* BUILD_BUG_ON - break compile if a condition is true.
* @condition: the condition which the compiler should know is false.
*
* If you have some code which relies on certain constants being equal, or
* other compile-time-evaluated condition, you should use BUILD_BUG_ON to
* detect if someone changes it.
*
* The implementation uses gcc's reluctance to create a negative array, but
* gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
* to inline functions). So as a fallback we use the optimizer; if it can't
* prove the condition is false, it will cause a link error on the undefined
* "__build_bug_on_failed". This error message can be harder to track down
* though, hence the two different methods.
*/
#ifndef __OPTIMIZE__
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2 * !!(condition)]))
#else
extern int __build_bug_on_failed;
#define BUILD_BUG_ON(condition) \
do { \
((void)sizeof(char[1 - 2 * !!(condition)])); \
if (condition) \
__build_bug_on_failed = 1; \
} while (0)
#endif
#define lxc_iterate_parts(__iterator, __splitme, __separators) \
for (char *__p = NULL, *__it = strtok_r(__splitme, __separators, &__p); \
(__iterator = __it); \
__iterator = __it = strtok_r(NULL, __separators, &__p))
#define prctl_arg(x) ((unsigned long)x)
/* networking */
#ifndef NETLINK_GET_STRICT_CHK
#define NETLINK_GET_STRICT_CHK 12
#endif
#ifndef SOL_NETLINK
#define SOL_NETLINK 270
#endif
#ifndef IFLA_LINKMODE
#define IFLA_LINKMODE 17
#endif
#ifndef IFLA_LINKINFO
#define IFLA_LINKINFO 18
#endif
#ifndef IFLA_NET_NS_PID
#define IFLA_NET_NS_PID 19
#endif
#ifndef IFLA_NET_NS_FD
#define IFLA_NET_NS_FD 28
#endif
#ifndef IFLA_INFO_KIND
#define IFLA_INFO_KIND 1
#endif
#ifndef IFLA_VLAN_ID
#define IFLA_VLAN_ID 1
#endif
#ifndef IFLA_INFO_DATA
#define IFLA_INFO_DATA 2
#endif
#ifndef VETH_INFO_PEER
#define VETH_INFO_PEER 1
#endif
#ifndef VETH_MODE_BRIDGE
#define VETH_MODE_BRIDGE 1
#endif
#ifndef VETH_MODE_ROUTER
#define VETH_MODE_ROUTER 2
#endif
#ifndef IFLA_MACVLAN_MODE
#define IFLA_MACVLAN_MODE 1
#endif
#ifndef IFLA_IPVLAN_MODE
#define IFLA_IPVLAN_MODE 1
#endif
#ifndef IFLA_IPVLAN_ISOLATION
#define IFLA_IPVLAN_ISOLATION 2
#endif
#ifndef IFLA_NEW_NETNSID
#define IFLA_NEW_NETNSID 45
#endif
#ifdef IFLA_IF_NETNSID
#ifndef IFLA_TARGET_NETNSID
#define IFLA_TARGET_NETNSID = IFLA_IF_NETNSID
#endif
#else
#define IFLA_IF_NETNSID 46
#define IFLA_TARGET_NETNSID 46
#endif
#ifndef IFA_TARGET_NETNSID
#define IFA_TARGET_NETNSID 10
#endif
#ifndef IFLA_STATS
#define IFLA_STATS 7
#endif
#ifndef IFLA_STATS64
#define IFLA_STATS64 23
#endif
#ifndef RTM_NEWNSID
#define RTM_NEWNSID 88
#endif
#ifndef RTM_GETNSID
#define RTM_GETNSID 90
#endif
#ifndef NLMSG_ERROR
#define NLMSG_ERROR 0x2
#endif
#ifndef MACVLAN_MODE_PRIVATE
#define MACVLAN_MODE_PRIVATE 1
#endif
#ifndef MACVLAN_MODE_VEPA
#define MACVLAN_MODE_VEPA 2
#endif
#ifndef MACVLAN_MODE_BRIDGE
#define MACVLAN_MODE_BRIDGE 4
#endif
#ifndef MACVLAN_MODE_PASSTHRU
#define MACVLAN_MODE_PASSTHRU 8
#endif
#ifndef IPVLAN_MODE_L2
#define IPVLAN_MODE_L2 0
#endif
#ifndef IPVLAN_MODE_L3
#define IPVLAN_MODE_L3 1
#endif
#ifndef IPVLAN_MODE_L3S
#define IPVLAN_MODE_L3S 2
#endif
#ifndef IPVLAN_ISOLATION_BRIDGE
#define IPVLAN_ISOLATION_BRIDGE 0
#endif
#ifndef IPVLAN_ISOLATION_PRIVATE
#define IPVLAN_ISOLATION_PRIVATE 1
#endif
#ifndef IPVLAN_ISOLATION_VEPA
#define IPVLAN_ISOLATION_VEPA 2
#endif
#ifndef BRIDGE_VLAN_NONE
#define BRIDGE_VLAN_NONE -1 /* Bridge VLAN option set to "none". */
#endif
#ifndef BRIDGE_VLAN_ID_MAX
#define BRIDGE_VLAN_ID_MAX 4094 /* Bridge VLAN MAX VLAN ID. */
#endif
#ifndef BRIDGE_FLAGS_MASTER
#define BRIDGE_FLAGS_MASTER 1 /* Bridge command to/from parent */
#endif
#ifndef BRIDGE_VLAN_INFO_PVID
#define BRIDGE_VLAN_INFO_PVID (1<<1) /* VLAN is PVID, ingress untagged */
#endif
#ifndef BRIDGE_VLAN_INFO_UNTAGGED
#define BRIDGE_VLAN_INFO_UNTAGGED (1<<2) /* VLAN egresses untagged */
#endif
#ifndef IFLA_BRIDGE_FLAGS
#define IFLA_BRIDGE_FLAGS 0
#endif
#ifndef IFLA_BRIDGE_VLAN_INFO
#define IFLA_BRIDGE_VLAN_INFO 2
#endif
/* Attributes of RTM_NEWNSID/RTM_GETNSID messages */
enum {
__LXC_NETNSA_NONE,
#define __LXC_NETNSA_NSID_NOT_ASSIGNED -1
__LXC_NETNSA_NSID,
__LXC_NETNSA_PID,
__LXC_NETNSA_FD,
__LXC_NETNSA_MAX,
};
/* Length of abstract unix domain socket socket address. */
#define LXC_AUDS_ADDR_LEN sizeof(((struct sockaddr_un *)0)->sun_path)
/* mount */
#ifndef MS_PRIVATE
#define MS_PRIVATE (1<<18)
#endif
#ifndef MS_SLAVE
#define MS_SLAVE (1 << 19)
#endif
#ifndef MS_LAZYTIME
#define MS_LAZYTIME (1<<25)
#endif
#ifndef MS_REC
#define MS_REC 16384
#endif
/* open */
#ifndef O_PATH
#define O_PATH 010000000
#endif
#ifndef O_NOFOLLOW
#define O_NOFOLLOW 00400000
#endif
/* sockets */
#ifndef SOCK_CLOEXEC
#define SOCK_CLOEXEC 02000000
#endif
/* pointer conversion macros */
#define PTR_TO_INT(p) ((int)((intptr_t)(p)))
#define INT_TO_PTR(u) ((void *)((intptr_t)(u)))
#define PTR_TO_PID(p) ((pid_t)((intptr_t)(p)))
#define PID_TO_PTR(u) ((void *)((intptr_t)(u)))
#define PTR_TO_UINT64(p) ((uint64_t)((intptr_t)(p)))
#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
#define PTR_TO_USHORT(p) ((unsigned short)((uintptr_t)(p)))
#define LXC_INVALID_UID ((uid_t)-1)
#define LXC_INVALID_GID ((gid_t)-1)
#define STRLITERALLEN(x) (sizeof(""x"") - 1)
#define STRARRAYLEN(x) (sizeof(x) - 1)
/* Maximum number of bytes sendfile() is able to send in one go. */
#define LXC_SENDFILE_MAX 0x7ffff000
#define move_ptr(ptr) \
({ \
typeof(ptr) __internal_ptr__ = (ptr); \
(ptr) = NULL; \
__internal_ptr__; \
})
#define move_fd(fd) \
({ \
int __internal_fd__ = (fd); \
(fd) = -EBADF; \
__internal_fd__; \
})
#define ret_set_errno(__ret__, __errno__) \
({ \
typeof(__ret__) __internal_ret__ = (__ret__); \
errno = (__errno__); \
__internal_ret__; \
})
#define ret_errno(__errno__) \
({ \
errno = (__errno__); \
-(__errno__); \
})
#define free_move_ptr(a, b) \
({ \
free(a); \
(a) = move_ptr((b)); \
})
/* Container's specific file/directory names */
#define LXC_CONFIG_FNAME "config"
#define LXC_PARTIAL_FNAME "partial"
#define LXC_ROOTFS_DNAME "rootfs"
#define LXC_TIMESTAMP_FNAME "ts"
#define LXC_COMMENT_FNAME "comment"
#define ARRAY_SIZE(x) \
(__builtin_choose_expr(!__builtin_types_compatible_p(typeof(x), \
typeof(&*(x))), \
sizeof(x) / sizeof((x)[0]), ((void)0)))
#ifndef TIOCGPTPEER
#if defined __sparc__
#define TIOCGPTPEER _IO('t', 137)
#else
#define TIOCGPTPEER _IO('T', 0x41)
#endif
#endif
#endif /* __LXC_MACRO_H */