1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 /* Missing glibc definitions to access certain kernel APIs */
26 #include <sys/resource.h>
27 #include <sys/syscall.h>
32 #include <linux/oom.h>
33 #include <linux/input.h>
34 #include <linux/if_link.h>
35 #include <linux/loop.h>
36 #include <linux/audit.h>
37 #include <linux/capability.h>
44 #include <asm/sgidefs.h>
47 #ifdef HAVE_LINUX_BTRFS_H
48 #include <linux/btrfs.h>
54 #define RLIMIT_RTTIME 15
57 /* If RLIMIT_RTTIME is not defined, then we cannot use RLIMIT_NLIMITS as is */
58 #define _RLIMIT_MAX (RLIMIT_RTTIME+1 > RLIMIT_NLIMITS ? RLIMIT_RTTIME+1 : RLIMIT_NLIMITS)
60 #ifndef F_LINUX_SPECIFIC_BASE
61 #define F_LINUX_SPECIFIC_BASE 1024
65 #define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7)
69 #define F_GETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 8)
73 #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
74 #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
76 #define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
77 #define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
78 #define F_SEAL_GROW 0x0004 /* prevent file from growing */
79 #define F_SEAL_WRITE 0x0008 /* prevent writes */
83 #define F_OFD_GETLK 36
84 #define F_OFD_SETLK 37
85 #define F_OFD_SETLKW 38
88 #ifndef MFD_ALLOW_SEALING
89 #define MFD_ALLOW_SEALING 0x0002U
93 #define MFD_CLOEXEC 0x0001U
97 #define IP_FREEBIND 15
100 #ifndef OOM_SCORE_ADJ_MIN
101 #define OOM_SCORE_ADJ_MIN (-1000)
104 #ifndef OOM_SCORE_ADJ_MAX
105 #define OOM_SCORE_ADJ_MAX 1000
108 #ifndef AUDIT_SERVICE_START
109 #define AUDIT_SERVICE_START 1130 /* Service (daemon) start */
112 #ifndef AUDIT_SERVICE_STOP
113 #define AUDIT_SERVICE_STOP 1131 /* Service (daemon) stop */
117 #define TIOCVHANGUP 0x5437
120 #ifndef IP_TRANSPARENT
121 #define IP_TRANSPARENT 19
125 #define SOL_NETLINK 270
128 #if !HAVE_DECL_PIVOT_ROOT
129 static inline int pivot_root(const char *new_root, const char *put_old) {
130 return syscall(SYS_pivot_root, new_root, put_old);
134 #ifndef __NR_memfd_create
135 # if defined __x86_64__
136 # define __NR_memfd_create 319
137 # elif defined __arm__
138 # define __NR_memfd_create 385
139 # elif defined __aarch64__
140 # define __NR_memfd_create 279
141 # elif defined _MIPS_SIM
142 # if _MIPS_SIM == _MIPS_SIM_ABI32
143 # define __NR_memfd_create 4354
145 # if _MIPS_SIM == _MIPS_SIM_NABI32
146 # define __NR_memfd_create 6318
148 # if _MIPS_SIM == _MIPS_SIM_ABI64
149 # define __NR_memfd_create 5314
151 # elif defined __i386__
152 # define __NR_memfd_create 356
154 # warning "__NR_memfd_create unknown for your architecture"
155 # define __NR_memfd_create 0xffffffff
159 #ifndef HAVE_MEMFD_CREATE
160 static inline int memfd_create(const char *name, unsigned int flags) {
161 return syscall(__NR_memfd_create, name, flags);
165 #ifndef __NR_getrandom
166 # if defined __x86_64__
167 # define __NR_getrandom 318
168 # elif defined(__i386__)
169 # define __NR_getrandom 355
170 # elif defined(__arm__)
171 # define __NR_getrandom 384
172 # elif defined(__aarch64__)
173 # define __NR_getrandom 278
174 # elif defined(__ia64__)
175 # define __NR_getrandom 1339
176 # elif defined(__m68k__)
177 # define __NR_getrandom 352
178 # elif defined(__s390x__)
179 # define __NR_getrandom 349
180 # elif defined(__powerpc__)
181 # define __NR_getrandom 359
183 # warning "__NR_getrandom unknown for your architecture"
184 # define __NR_getrandom 0xffffffff
188 #if !HAVE_DECL_GETRANDOM
189 static inline int getrandom(void *buffer, size_t count, unsigned flags) {
190 return syscall(__NR_getrandom, buffer, count, flags);
194 #ifndef GRND_NONBLOCK
195 #define GRND_NONBLOCK 0x0001
199 #define GRND_RANDOM 0x0002
202 #ifndef BTRFS_IOCTL_MAGIC
203 #define BTRFS_IOCTL_MAGIC 0x94
206 #ifndef BTRFS_PATH_NAME_MAX
207 #define BTRFS_PATH_NAME_MAX 4087
210 #ifndef BTRFS_DEVICE_PATH_NAME_MAX
211 #define BTRFS_DEVICE_PATH_NAME_MAX 1024
214 #ifndef BTRFS_FSID_SIZE
215 #define BTRFS_FSID_SIZE 16
218 #ifndef BTRFS_UUID_SIZE
219 #define BTRFS_UUID_SIZE 16
222 #ifndef HAVE_LINUX_BTRFS_H
223 struct btrfs_ioctl_vol_args {
225 char name[BTRFS_PATH_NAME_MAX + 1];
228 struct btrfs_ioctl_dev_info_args {
229 uint64_t devid; /* in/out */
230 uint8_t uuid[BTRFS_UUID_SIZE]; /* in/out */
231 uint64_t bytes_used; /* out */
232 uint64_t total_bytes; /* out */
233 uint64_t unused[379]; /* pad to 4k */
234 char path[BTRFS_DEVICE_PATH_NAME_MAX]; /* out */
237 struct btrfs_ioctl_fs_info_args {
238 uint64_t max_id; /* out */
239 uint64_t num_devices; /* out */
240 uint8_t fsid[BTRFS_FSID_SIZE]; /* out */
241 uint64_t reserved[124]; /* pad to 1k */
245 #ifndef BTRFS_IOC_DEFRAG
246 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
247 struct btrfs_ioctl_vol_args)
250 #ifndef BTRFS_IOC_DEV_INFO
251 #define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
252 struct btrfs_ioctl_dev_info_args)
255 #ifndef BTRFS_IOC_FS_INFO
256 #define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
257 struct btrfs_ioctl_fs_info_args)
260 #ifndef BTRFS_IOC_DEVICES_READY
261 #define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
262 struct btrfs_ioctl_vol_args)
265 #ifndef BTRFS_FIRST_FREE_OBJECTID
266 #define BTRFS_FIRST_FREE_OBJECTID 256
269 #ifndef BTRFS_ROOT_TREE_OBJECTID
270 #define BTRFS_ROOT_TREE_OBJECTID 1
273 #ifndef BTRFS_QUOTA_TREE_OBJECTID
274 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
277 #ifndef BTRFS_ROOT_ITEM_KEY
278 #define BTRFS_ROOT_ITEM_KEY 132
281 #ifndef BTRFS_QGROUP_STATUS_KEY
282 #define BTRFS_QGROUP_STATUS_KEY 240
285 #ifndef BTRFS_QGROUP_INFO_KEY
286 #define BTRFS_QGROUP_INFO_KEY 242
289 #ifndef BTRFS_QGROUP_LIMIT_KEY
290 #define BTRFS_QGROUP_LIMIT_KEY 244
293 #ifndef BTRFS_SUPER_MAGIC
294 #define BTRFS_SUPER_MAGIC 0x9123683E
302 #define MS_PRIVATE (1 << 18)
305 #if !HAVE_DECL_GETTID
306 static inline pid_t gettid(void) {
307 return (pid_t) syscall(SYS_gettid);
312 #define SCM_SECURITY 0x03
315 #ifndef MS_STRICTATIME
316 #define MS_STRICTATIME (1<<24)
324 #define MS_SHARED (1<<20)
327 #ifndef PR_SET_NO_NEW_PRIVS
328 #define PR_SET_NO_NEW_PRIVS 38
331 #ifndef PR_SET_CHILD_SUBREAPER
332 #define PR_SET_CHILD_SUBREAPER 36
335 #ifndef MAX_HANDLE_SZ
336 #define MAX_HANDLE_SZ 128
339 #ifndef __NR_name_to_handle_at
340 # if defined(__x86_64__)
341 # define __NR_name_to_handle_at 303
342 # elif defined(__i386__)
343 # define __NR_name_to_handle_at 341
344 # elif defined(__arm__)
345 # define __NR_name_to_handle_at 370
346 # elif defined(__powerpc__)
347 # define __NR_name_to_handle_at 345
349 # error "__NR_name_to_handle_at is not defined"
353 #if !HAVE_DECL_NAME_TO_HANDLE_AT
355 unsigned int handle_bytes;
357 unsigned char f_handle[0];
360 static inline int name_to_handle_at(int fd, const char *name, struct file_handle *handle, int *mnt_id, int flags) {
361 return syscall(__NR_name_to_handle_at, fd, name, handle, mnt_id, flags);
365 #ifndef HAVE_SECURE_GETENV
366 # ifdef HAVE___SECURE_GETENV
367 # define secure_getenv __secure_getenv
369 # error "neither secure_getenv nor __secure_getenv are available"
373 #ifndef CIFS_MAGIC_NUMBER
374 # define CIFS_MAGIC_NUMBER 0xFF534D42
377 #ifndef TFD_TIMER_CANCEL_ON_SET
378 # define TFD_TIMER_CANCEL_ON_SET (1 << 1)
382 # define SO_REUSEPORT 15
386 # define EVIOCREVOKE _IOW('E', 0x91, int)
389 #ifndef DRM_IOCTL_SET_MASTER
390 # define DRM_IOCTL_SET_MASTER _IO('d', 0x1e)
393 #ifndef DRM_IOCTL_DROP_MASTER
394 # define DRM_IOCTL_DROP_MASTER _IO('d', 0x1f)
397 #if defined(__i386__) || defined(__x86_64__)
399 /* The precise definition of __O_TMPFILE is arch specific, so let's
400 * just define this on x86 where we know the value. */
403 #define __O_TMPFILE 020000000
406 /* a horrid kludge trying to make sure that this will fail on old kernels */
408 #define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
414 # if defined(__x86_64__)
415 # define __NR_setns 308
416 # elif defined(__i386__)
417 # define __NR_setns 346
419 # error "__NR_setns is not defined"
424 static inline int setns(int fd, int nstype) {
425 return syscall(__NR_setns, fd, nstype);
429 #if !HAVE_DECL_LO_FLAGS_PARTSCAN
430 #define LO_FLAGS_PARTSCAN 8
433 #ifndef LOOP_CTL_REMOVE
434 #define LOOP_CTL_REMOVE 0x4C81
437 #ifndef LOOP_CTL_GET_FREE
438 #define LOOP_CTL_GET_FREE 0x4C82
441 #if !HAVE_DECL_IFLA_INET6_ADDR_GEN_MODE
442 #define IFLA_INET6_UNSPEC 0
443 #define IFLA_INET6_FLAGS 1
444 #define IFLA_INET6_CONF 2
445 #define IFLA_INET6_STATS 3
446 #define IFLA_INET6_MCAST 4
447 #define IFLA_INET6_CACHEINFO 5
448 #define IFLA_INET6_ICMP6STATS 6
449 #define IFLA_INET6_TOKEN 7
450 #define IFLA_INET6_ADDR_GEN_MODE 8
451 #define __IFLA_INET6_MAX 9
453 #define IFLA_INET6_MAX (__IFLA_INET6_MAX - 1)
455 #define IN6_ADDR_GEN_MODE_EUI64 0
456 #define IN6_ADDR_GEN_MODE_NONE 1
459 #if !HAVE_DECL_IFLA_MACVLAN_FLAGS
460 #define IFLA_MACVLAN_UNSPEC 0
461 #define IFLA_MACVLAN_MODE 1
462 #define IFLA_MACVLAN_FLAGS 2
463 #define __IFLA_MACVLAN_MAX 3
465 #define IFLA_MACVLAN_MAX (__IFLA_MACVLAN_MAX - 1)
468 #if !HAVE_DECL_IFLA_IPVLAN_MODE
469 #define IFLA_IPVLAN_UNSPEC 0
470 #define IFLA_IPVLAN_MODE 1
471 #define __IFLA_IPVLAN_MAX 2
473 #define IFLA_IPVLAN_MAX (__IFLA_IPVLAN_MAX - 1)
475 #define IPVLAN_MODE_L2 0
476 #define IPVLAN_MODE_L3 1
480 #if !HAVE_DECL_IFLA_VTI_REMOTE
481 #define IFLA_VTI_UNSPEC 0
482 #define IFLA_VTI_LINK 1
483 #define IFLA_VTI_IKEY 2
484 #define IFLA_VTI_OKEY 3
485 #define IFLA_VTI_LOCAL 4
486 #define IFLA_VTI_REMOTE 5
487 #define __IFLA_VTI_MAX 6
489 #define IFLA_VTI_MAX (__IFLA_VTI_MAX - 1)
492 #if !HAVE_DECL_IFLA_PHYS_PORT_ID
493 #undef IFLA_PROMISCUITY
494 #define IFLA_PROMISCUITY 30
495 #define IFLA_NUM_TX_QUEUES 31
496 #define IFLA_NUM_RX_QUEUES 32
497 #define IFLA_CARRIER 33
498 #define IFLA_PHYS_PORT_ID 34
499 #define __IFLA_MAX 35
501 #define IFLA_MAX (__IFLA_MAX - 1)
504 #if !HAVE_DECL_IFLA_BOND_AD_INFO
505 #define IFLA_BOND_UNSPEC 0
506 #define IFLA_BOND_MODE 1
507 #define IFLA_BOND_ACTIVE_SLAVE 2
508 #define IFLA_BOND_MIIMON 3
509 #define IFLA_BOND_UPDELAY 4
510 #define IFLA_BOND_DOWNDELAY 5
511 #define IFLA_BOND_USE_CARRIER 6
512 #define IFLA_BOND_ARP_INTERVAL 7
513 #define IFLA_BOND_ARP_IP_TARGET 8
514 #define IFLA_BOND_ARP_VALIDATE 9
515 #define IFLA_BOND_ARP_ALL_TARGETS 10
516 #define IFLA_BOND_PRIMARY 11
517 #define IFLA_BOND_PRIMARY_RESELECT 12
518 #define IFLA_BOND_FAIL_OVER_MAC 13
519 #define IFLA_BOND_XMIT_HASH_POLICY 14
520 #define IFLA_BOND_RESEND_IGMP 15
521 #define IFLA_BOND_NUM_PEER_NOTIF 16
522 #define IFLA_BOND_ALL_SLAVES_ACTIVE 17
523 #define IFLA_BOND_MIN_LINKS 18
524 #define IFLA_BOND_LP_INTERVAL 19
525 #define IFLA_BOND_PACKETS_PER_SLAVE 20
526 #define IFLA_BOND_AD_LACP_RATE 21
527 #define IFLA_BOND_AD_SELECT 22
528 #define IFLA_BOND_AD_INFO 23
529 #define __IFLA_BOND_MAX 24
531 #define IFLA_BOND_MAX (__IFLA_BOND_MAX - 1)
534 #if !HAVE_DECL_IFLA_VLAN_PROTOCOL
535 #define IFLA_VLAN_UNSPEC 0
536 #define IFLA_VLAN_ID 1
537 #define IFLA_VLAN_FLAGS 2
538 #define IFLA_VLAN_EGRESS_QOS 3
539 #define IFLA_VLAN_INGRESS_QOS 4
540 #define IFLA_VLAN_PROTOCOL 5
541 #define __IFLA_VLAN_MAX 6
543 #define IFLA_VLAN_MAX (__IFLA_VLAN_MAX - 1)
546 #if !HAVE_DECL_IFLA_VXLAN_LOCAL6
547 #define IFLA_VXLAN_UNSPEC 0
548 #define IFLA_VXLAN_ID 1
549 #define IFLA_VXLAN_GROUP 2
550 #define IFLA_VXLAN_LINK 3
551 #define IFLA_VXLAN_LOCAL 4
552 #define IFLA_VXLAN_TTL 5
553 #define IFLA_VXLAN_TOS 6
554 #define IFLA_VXLAN_LEARNING 7
555 #define IFLA_VXLAN_AGEING 8
556 #define IFLA_VXLAN_LIMIT 9
557 #define IFLA_VXLAN_PORT_RANGE 10
558 #define IFLA_VXLAN_PROXY 11
559 #define IFLA_VXLAN_RSC 12
560 #define IFLA_VXLAN_L2MISS 13
561 #define IFLA_VXLAN_L3MISS 14
562 #define IFLA_VXLAN_PORT 15
563 #define IFLA_VXLAN_GROUP6 16
564 #define IFLA_VXLAN_LOCAL6 17
565 #define __IFLA_VXLAN_MAX 18
567 #define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
570 #if !HAVE_DECL_IFLA_IPTUN_6RD_RELAY_PREFIXLEN
571 #define IFLA_IPTUN_UNSPEC 0
572 #define IFLA_IPTUN_LINK 1
573 #define IFLA_IPTUN_LOCAL 2
574 #define IFLA_IPTUN_REMOTE 3
575 #define IFLA_IPTUN_TTL 4
576 #define IFLA_IPTUN_TOS 5
577 #define IFLA_IPTUN_ENCAP_LIMIT 6
578 #define IFLA_IPTUN_FLOWINFO 7
579 #define IFLA_IPTUN_FLAGS 8
580 #define IFLA_IPTUN_PROTO 9
581 #define IFLA_IPTUN_PMTUDISC 10
582 #define IFLA_IPTUN_6RD_PREFIX 11
583 #define IFLA_IPTUN_6RD_RELAY_PREFIX 12
584 #define IFLA_IPTUN_6RD_PREFIXLEN 13
585 #define IFLA_IPTUN_6RD_RELAY_PREFIXLEN 14
586 #define __IFLA_IPTUN_MAX 15
588 #define IFLA_IPTUN_MAX (__IFLA_IPTUN_MAX - 1)
591 #if !HAVE_DECL_IFLA_BRIDGE_VLAN_INFO
592 #define IFLA_BRIDGE_FLAGS 0
593 #define IFLA_BRIDGE_MODE 1
594 #define IFLA_BRIDGE_VLAN_INFO 2
595 #define __IFLA_BRIDGE_MAX 3
597 #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
600 #if !HAVE_DECL_IFLA_BRPORT_UNICAST_FLOOD
601 #define IFLA_BRPORT_UNSPEC 0
602 #define IFLA_BRPORT_STATE 1
603 #define IFLA_BRPORT_PRIORITY 2
604 #define IFLA_BRPORT_COST 3
605 #define IFLA_BRPORT_MODE 4
606 #define IFLA_BRPORT_GUARD 5
607 #define IFLA_BRPORT_PROTECT 6
608 #define IFLA_BRPORT_FAST_LEAVE 7
609 #define IFLA_BRPORT_LEARNING 8
610 #define IFLA_BRPORT_UNICAST_FLOOD 9
611 #define __IFLA_BRPORT_MAX 10
613 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
616 #ifndef IPV6_UNICAST_IF
617 #define IPV6_UNICAST_IF 76
620 #ifndef IFF_MULTI_QUEUE
621 #define IFF_MULTI_QUEUE 0x100
625 #define IFF_LOWER_UP 0x10000
629 #define IFF_DORMANT 0x20000
632 #ifndef BOND_XMIT_POLICY_ENCAP23
633 #define BOND_XMIT_POLICY_ENCAP23 3
636 #ifndef BOND_XMIT_POLICY_ENCAP34
637 #define BOND_XMIT_POLICY_ENCAP34 4
640 #ifndef NET_ADDR_RANDOM
641 # define NET_ADDR_RANDOM 1
644 #ifndef NET_NAME_UNKNOWN
645 # define NET_NAME_UNKNOWN 0
648 #ifndef NET_NAME_ENUM
649 # define NET_NAME_ENUM 1
652 #ifndef NET_NAME_PREDICTABLE
653 # define NET_NAME_PREDICTABLE 2
656 #ifndef NET_NAME_USER
657 # define NET_NAME_USER 3
660 #ifndef NET_NAME_RENAMED
661 # define NET_NAME_RENAMED 4
665 # define BPF_XOR 0xa0
668 /* Note that LOOPBACK_IFINDEX is currently not exported by the
669 * kernel/glibc, but hardcoded internally by the kernel. However, as
670 * it is exported to userspace indirectly via rtnetlink and the
671 * ioctls, and made use of widely we define it here too, in a way that
672 * is compatible with the kernel's internal definition. */
673 #ifndef LOOPBACK_IFINDEX
674 #define LOOPBACK_IFINDEX 1
677 #ifndef MAX_AUDIT_MESSAGE_LENGTH
678 #define MAX_AUDIT_MESSAGE_LENGTH 8970
681 #ifndef AUDIT_NLGRP_MAX
682 #define AUDIT_NLGRP_READLOG 1
685 #ifndef CAP_MAC_OVERRIDE
686 #define CAP_MAC_OVERRIDE 32
689 #ifndef CAP_MAC_ADMIN
690 #define CAP_MAC_ADMIN 33
694 #define CAP_SYSLOG 34
697 #ifndef CAP_WAKE_ALARM
698 #define CAP_WAKE_ALARM 35
701 #ifndef CAP_BLOCK_SUSPEND
702 #define CAP_BLOCK_SUSPEND 36
705 #ifndef CAP_AUDIT_READ
706 #define CAP_AUDIT_READ 37
709 static inline int raw_clone(unsigned long flags, void *child_stack) {
710 #if defined(__s390__) || defined(__CRIS__)
711 /* On s390 and cris the order of the first and second arguments
712 * of the raw clone() system call is reversed. */
713 return (int) syscall(__NR_clone, child_stack, flags);
715 return (int) syscall(__NR_clone, flags, child_stack);
719 static inline pid_t raw_getpid(void) {
720 return (pid_t) syscall(__NR_getpid);
723 #if !HAVE_DECL_RENAMEAT2
725 #ifndef __NR_renameat2
726 # if defined __x86_64__
727 # define __NR_renameat2 316
728 # elif defined __arm__
729 # define __NR_renameat2 382
730 # elif defined _MIPS_SIM
731 # if _MIPS_SIM == _MIPS_SIM_ABI32
732 # define __NR_renameat2 4351
734 # if _MIPS_SIM == _MIPS_SIM_NABI32
735 # define __NR_renameat2 6315
737 # if _MIPS_SIM == _MIPS_SIM_ABI64
738 # define __NR_renameat2 5311
740 # elif defined __i386__
741 # define __NR_renameat2 353
743 # warning "__NR_renameat2 unknown for your architecture"
744 # define __NR_renameat2 0xffffffff
748 static inline int renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) {
749 return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags);
753 #ifndef RENAME_NOREPLACE
754 #define RENAME_NOREPLACE (1 << 0)
758 static inline int kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
759 return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);