summaryrefslogtreecommitdiffstats
path: root/src/basic/missing_syscall.h
blob: 47c517703540a499ddb2929fce94d2427d0f2122 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

/* Missing glibc definitions to access certain kernel APIs */

#include <errno.h>
#include <fcntl.h>
#if HAVE_LINUX_TIME_TYPES_H
/* This header defines __kernel_timespec for us, but is only available since Linux 5.1, hence conditionally
 * include this. */
#include <linux/time_types.h>
#endif
#include <signal.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#ifdef ARCH_MIPS
#include <asm/sgidefs.h>
#endif

#include "macro.h"
#include "missing_keyctl.h"
#include "missing_stat.h"
#include "missing_syscall_def.h"

/* linux/kcmp.h */
#ifndef KCMP_FILE /* 3f4994cfc15f38a3159c6e3a4b3ab2e1481a6b02 (3.19) */
#define KCMP_FILE 0
#endif

/* ======================================================================= */

#if !HAVE_PIVOT_ROOT
static inline int missing_pivot_root(const char *new_root, const char *put_old) {
        return syscall(__NR_pivot_root, new_root, put_old);
}

#  define pivot_root missing_pivot_root
#endif

/* ======================================================================= */

#if !HAVE_IOPRIO_GET
static inline int missing_ioprio_get(int which, int who) {
        return syscall(__NR_ioprio_get, which, who);
}

#  define ioprio_get missing_ioprio_get
#endif

/* ======================================================================= */

#if !HAVE_IOPRIO_SET
static inline int missing_ioprio_set(int which, int who, int ioprio) {
        return syscall(__NR_ioprio_set, which, who, ioprio);
}

#  define ioprio_set missing_ioprio_set
#endif

/* ======================================================================= */

#if !HAVE_MEMFD_CREATE
static inline int missing_memfd_create(const char *name, unsigned int flags) {
#  ifdef __NR_memfd_create
        return syscall(__NR_memfd_create, name, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define memfd_create missing_memfd_create
#endif

/* ======================================================================= */

#if !HAVE_GETRANDOM
/* glibc says getrandom() returns ssize_t */
static inline ssize_t missing_getrandom(void *buffer, size_t count, unsigned flags) {
#  ifdef __NR_getrandom
        return syscall(__NR_getrandom, buffer, count, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define getrandom missing_getrandom
#endif

/* ======================================================================= */

/* The syscall has been defined since forever, but the glibc wrapper was missing. */
#if !HAVE_GETTID
static inline pid_t missing_gettid(void) {
#  if defined __NR_gettid && __NR_gettid >= 0
        return (pid_t) syscall(__NR_gettid);
#  else
#    error "__NR_gettid not defined"
#  endif
}

#  define gettid missing_gettid
#endif

/* ======================================================================= */

#if !HAVE_NAME_TO_HANDLE_AT
struct file_handle {
        unsigned int handle_bytes;
        int handle_type;
        unsigned char f_handle[0];
};

static inline int missing_name_to_handle_at(int fd, const char *name, struct file_handle *handle, int *mnt_id, int flags) {
#  ifdef __NR_name_to_handle_at
        return syscall(__NR_name_to_handle_at, fd, name, handle, mnt_id, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define name_to_handle_at missing_name_to_handle_at
#endif

/* ======================================================================= */

#if !HAVE_SETNS
static inline int missing_setns(int fd, int nstype) {
#  ifdef __NR_setns
        return syscall(__NR_setns, fd, nstype);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define setns missing_setns
#endif

/* ======================================================================= */

static inline pid_t raw_getpid(void) {
#if defined(__alpha__)
        return (pid_t) syscall(__NR_getxpid);
#else
        return (pid_t) syscall(__NR_getpid);
#endif
}

/* ======================================================================= */

#if !HAVE_RENAMEAT2
static inline int missing_renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) {
#  ifdef __NR_renameat2
        return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define renameat2 missing_renameat2
#endif

/* ======================================================================= */

#if !HAVE_KCMP
static inline int missing_kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
#  if defined __NR_kcmp && __NR_kcmp >= 0
        return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define kcmp missing_kcmp
#endif

/* ======================================================================= */

#if !HAVE_KEYCTL
static inline long missing_keyctl(int cmd, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5) {
#  if defined __NR_keyctl && __NR_keyctl >= 0
        return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
#  else
        errno = ENOSYS;
        return -1;
#  endif

#  define keyctl missing_keyctl
}

static inline key_serial_t missing_add_key(const char *type, const char *description, const void *payload, size_t plen, key_serial_t ringid) {
#  if defined __NR_add_key && __NR_add_key >= 0
        return syscall(__NR_add_key, type, description, payload, plen, ringid);
#  else
        errno = ENOSYS;
        return -1;
#  endif

#  define add_key missing_add_key
}

static inline key_serial_t missing_request_key(const char *type, const char *description, const char * callout_info, key_serial_t destringid) {
#  if defined __NR_request_key && __NR_request_key >= 0
        return syscall(__NR_request_key, type, description, callout_info, destringid);
#  else
        errno = ENOSYS;
        return -1;
#  endif

#  define request_key missing_request_key
}
#endif

/* ======================================================================= */

#if !HAVE_COPY_FILE_RANGE
static inline ssize_t missing_copy_file_range(int fd_in, loff_t *off_in,
                                              int fd_out, loff_t *off_out,
                                              size_t len,
                                              unsigned int flags) {
#  ifdef __NR_copy_file_range
        return syscall(__NR_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define copy_file_range missing_copy_file_range
#endif

/* ======================================================================= */

#if !HAVE_BPF
union bpf_attr;

static inline int missing_bpf(int cmd, union bpf_attr *attr, size_t size) {
#ifdef __NR_bpf
        return (int) syscall(__NR_bpf, cmd, attr, size);
#else
        errno = ENOSYS;
        return -1;
#endif
}

#  define bpf missing_bpf
#endif

/* ======================================================================= */

#if !HAVE_STATX
struct statx;

static inline ssize_t missing_statx(int dfd, const char *filename, unsigned flags, unsigned int mask, struct statx *buffer) {
#  ifdef __NR_statx
        return syscall(__NR_statx, dfd, filename, flags, mask, buffer);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}
#endif

/* This typedef is supposed to be always defined. */
typedef struct statx struct_statx;

#if !HAVE_STATX
#  define statx(dfd, filename, flags, mask, buffer) missing_statx(dfd, filename, flags, mask, buffer)
#endif

/* ======================================================================= */

#if !HAVE_SET_MEMPOLICY
enum {
        MPOL_DEFAULT,
        MPOL_PREFERRED,
        MPOL_BIND,
        MPOL_INTERLEAVE,
        MPOL_LOCAL,
};

static inline long missing_set_mempolicy(int mode, const unsigned long *nodemask,
                           unsigned long maxnode) {
        long i;
#  if defined __NR_set_mempolicy && __NR_set_mempolicy >= 0
        i = syscall(__NR_set_mempolicy, mode, nodemask, maxnode);
#  else
        errno = ENOSYS;
        i = -1;
#  endif
        return i;
}

#  define set_mempolicy missing_set_mempolicy
#endif

#if !HAVE_GET_MEMPOLICY
static inline long missing_get_mempolicy(int *mode, unsigned long *nodemask,
                           unsigned long maxnode, void *addr,
                           unsigned long flags) {
        long i;
#  if defined __NR_get_mempolicy && __NR_get_mempolicy >= 0
        i = syscall(__NR_get_mempolicy, mode, nodemask, maxnode, addr, flags);
#  else
        errno = ENOSYS;
        i = -1;
#  endif
        return i;
}

#  define get_mempolicy missing_get_mempolicy
#endif

/* ======================================================================= */

#if !HAVE_PIDFD_SEND_SIGNAL
static inline int missing_pidfd_send_signal(int fd, int sig, siginfo_t *info, unsigned flags) {
#  ifdef __NR_pidfd_send_signal
        return syscall(__NR_pidfd_send_signal, fd, sig, info, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define pidfd_send_signal missing_pidfd_send_signal
#endif

#if !HAVE_PIDFD_OPEN
static inline int missing_pidfd_open(pid_t pid, unsigned flags) {
#  ifdef __NR_pidfd_open
        return syscall(__NR_pidfd_open, pid, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define pidfd_open missing_pidfd_open
#endif

/* ======================================================================= */

#if !HAVE_RT_SIGQUEUEINFO
static inline int missing_rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *info) {
#  if defined __NR_rt_sigqueueinfo && __NR_rt_sigqueueinfo >= 0
        return syscall(__NR_rt_sigqueueinfo, tgid, sig, info);
#  else
#    error "__NR_rt_sigqueueinfo not defined"
#  endif
}

#  define rt_sigqueueinfo missing_rt_sigqueueinfo
#endif

/* ======================================================================= */

#if !HAVE_EXECVEAT
static inline int missing_execveat(int dirfd, const char *pathname,
                                   char *const argv[], char *const envp[],
                                   int flags) {
#  if defined __NR_execveat && __NR_execveat >= 0
        return syscall(__NR_execveat, dirfd, pathname, argv, envp, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  undef AT_EMPTY_PATH
#  define AT_EMPTY_PATH 0x1000
#  define execveat missing_execveat
#endif

/* ======================================================================= */

#if !HAVE_CLOSE_RANGE
static inline int missing_close_range(unsigned first_fd, unsigned end_fd, unsigned flags) {
#  ifdef __NR_close_range
        /* Kernel-side the syscall expects fds as unsigned integers (just like close() actually), while
         * userspace exclusively uses signed integers for fds. glibc chose to expose it 1:1 however, hence we
         * do so here too, even if we end up passing signed fds to it most of the time. */
        return syscall(__NR_close_range,
                       first_fd,
                       end_fd,
                       flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define close_range missing_close_range
#endif

/* ======================================================================= */

#if !HAVE_EPOLL_PWAIT2

/* Defined to be equivalent to the kernel's _NSIG_WORDS, i.e. the size of the array of longs that is
 * encapsulated by sigset_t. */
#define KERNEL_NSIG_WORDS (64 / (sizeof(long) * 8))
#define KERNEL_NSIG_BYTES (KERNEL_NSIG_WORDS * sizeof(long))

struct epoll_event;

static inline int missing_epoll_pwait2(
                int fd,
                struct epoll_event *events,
                int maxevents,
                const struct timespec *timeout,
                const sigset_t *sigset) {

#  if defined(__NR_epoll_pwait2) && HAVE_LINUX_TIME_TYPES_H
        if (timeout) {
                /* Convert from userspace timespec to kernel timespec */
                struct __kernel_timespec ts = {
                        .tv_sec = timeout->tv_sec,
                        .tv_nsec = timeout->tv_nsec,
                };

                return syscall(__NR_epoll_pwait2, fd, events, maxevents, &ts, sigset, sigset ? KERNEL_NSIG_BYTES : 0);
        } else
                return syscall(__NR_epoll_pwait2, fd, events, maxevents, NULL, sigset, sigset ? KERNEL_NSIG_BYTES : 0);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define epoll_pwait2 missing_epoll_pwait2
#endif

/* ======================================================================= */

#if !HAVE_MOUNT_SETATTR

#if !HAVE_STRUCT_MOUNT_ATTR
struct mount_attr {
        uint64_t attr_set;
        uint64_t attr_clr;
        uint64_t propagation;
        uint64_t userns_fd;
};
#else
struct mount_attr;
#endif

#ifndef MOUNT_ATTR_RDONLY
#define MOUNT_ATTR_RDONLY       0x00000001 /* Mount read-only */
#endif

#ifndef MOUNT_ATTR_NOSUID
#define MOUNT_ATTR_NOSUID       0x00000002 /* Ignore suid and sgid bits */
#endif

#ifndef MOUNT_ATTR_NODEV
#define MOUNT_ATTR_NODEV        0x00000004 /* Disallow access to device special files */
#endif

#ifndef MOUNT_ATTR_NOEXEC
#define MOUNT_ATTR_NOEXEC       0x00000008 /* Disallow program execution */
#endif

#ifndef MOUNT_ATTR__ATIME
#define MOUNT_ATTR__ATIME       0x00000070 /* Setting on how atime should be updated */
#endif

#ifndef MOUNT_ATTR_RELATIME
#define MOUNT_ATTR_RELATIME     0x00000000 /* - Update atime relative to mtime/ctime. */
#endif

#ifndef MOUNT_ATTR_NOATIME
#define MOUNT_ATTR_NOATIME      0x00000010 /* - Do not update access times. */
#endif

#ifndef MOUNT_ATTR_STRICTATIME
#define MOUNT_ATTR_STRICTATIME  0x00000020 /* - Always perform atime updates */
#endif

#ifndef MOUNT_ATTR_NODIRATIME
#define MOUNT_ATTR_NODIRATIME   0x00000080 /* Do not update directory access times */
#endif

#ifndef MOUNT_ATTR_IDMAP
#define MOUNT_ATTR_IDMAP        0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
#endif

#ifndef MOUNT_ATTR_NOSYMFOLLOW
#define MOUNT_ATTR_NOSYMFOLLOW  0x00200000 /* Do not follow symlinks */
#endif

#ifndef MOUNT_ATTR_SIZE_VER0
#define MOUNT_ATTR_SIZE_VER0    32 /* sizeof first published struct */
#endif

#ifndef AT_RECURSIVE
#define AT_RECURSIVE 0x8000
#endif

static inline int missing_mount_setattr(
                int dfd,
                const char *path,
                unsigned flags,
                struct mount_attr *attr,
                size_t size) {

#  if defined __NR_mount_setattr && __NR_mount_setattr >= 0
        return syscall(__NR_mount_setattr, dfd, path, flags, attr, size);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define mount_setattr missing_mount_setattr
#endif

/* ======================================================================= */

#if !HAVE_OPEN_TREE

#ifndef OPEN_TREE_CLONE
#define OPEN_TREE_CLONE 1
#endif

#ifndef OPEN_TREE_CLOEXEC
#define OPEN_TREE_CLOEXEC O_CLOEXEC
#endif

static inline int missing_open_tree(
                int dfd,
                const char *filename,
                unsigned flags) {

#  if defined __NR_open_tree && __NR_open_tree >= 0
        return syscall(__NR_open_tree, dfd, filename, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define open_tree missing_open_tree
#endif

/* ======================================================================= */

#if !HAVE_MOVE_MOUNT

#ifndef MOVE_MOUNT_F_EMPTY_PATH
#define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */
#endif

#ifndef MOVE_MOUNT_T_EMPTY_PATH
#define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */
#endif

static inline int missing_move_mount(
                int from_dfd,
                const char *from_pathname,
                int to_dfd,
                const char *to_pathname,
                unsigned flags) {

#  if defined __NR_move_mount && __NR_move_mount >= 0
        return syscall(__NR_move_mount, from_dfd, from_pathname, to_dfd, to_pathname, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define move_mount missing_move_mount
#endif

/* ======================================================================= */

#if !HAVE_FSOPEN

#ifndef FSOPEN_CLOEXEC
#define FSOPEN_CLOEXEC 0x00000001
#endif

static inline int missing_fsopen(const char *fsname, unsigned flags) {
#  if defined __NR_fsopen && __NR_fsopen >= 0
        return syscall(__NR_fsopen, fsname, flags);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define fsopen missing_fsopen
#endif

/* ======================================================================= */

#if !HAVE_FSCONFIG

#ifndef FSCONFIG_SET_STRING
#define FSCONFIG_SET_STRING 1 /* Set parameter, supplying a string value */
#endif

static inline int missing_fsconfig(int fd, unsigned cmd, const char *key, const void *value, int aux) {
#  if defined __NR_fsconfig && __NR_fsconfig >= 0
        return syscall(__NR_fsconfig, fd, cmd, key, value, aux);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define fsconfig missing_fsconfig
#endif

/* ======================================================================= */

#if !HAVE_GETDENTS64

static inline ssize_t missing_getdents64(int fd, void *buffer, size_t length) {
#  if defined __NR_getdents64 && __NR_getdents64 >= 0
        return syscall(__NR_getdents64, fd, buffer, length);
#  else
        errno = ENOSYS;
        return -1;
#  endif
}

#  define getdents64 missing_getdents64
#endif