1 /* SPDX-License-Identifier: LGPL-2.1 OR MIT */
2 /*
3 * Syscall definitions for NOLIBC (those in man(2))
4 * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
5 */
6
7 #ifndef _NOLIBC_SYS_H
8 #define _NOLIBC_SYS_H
9
10 #include "std.h"
11
12 /* system includes */
13 #include <asm/unistd.h>
14 #include <asm/signal.h> /* for SIGCHLD */
15 #include <asm/ioctls.h>
16 #include <asm/mman.h>
17 #include <linux/fs.h>
18 #include <linux/loop.h>
19 #include <linux/time.h>
20 #include <linux/auxvec.h>
21 #include <linux/fcntl.h> /* for O_* and AT_* */
22 #include <linux/stat.h> /* for statx() */
23 #include <linux/prctl.h>
24 #include <linux/resource.h>
25 #include <linux/utsname.h>
26
27 #include "arch.h"
28 #include "errno.h"
29 #include "stdarg.h"
30 #include "types.h"
31
32
33 /* Syscall return helper: takes the syscall value in argument and checks for an
34 * error in it. This may only be used with signed returns (int or long), but
35 * not with pointers. An error is any value < 0. When an error is encountered,
36 * -ret is set into errno and -1 is returned. Otherwise the returned value is
37 * passed as-is with its type preserved.
38 */
39
40 #define __sysret(arg) \
41 ({ \
42 __typeof__(arg) __sysret_arg = (arg); \
43 (__sysret_arg < 0) /* error ? */ \
44 ? (({ SET_ERRNO(-__sysret_arg); }), -1) /* ret -1 with errno = -arg */ \
45 : __sysret_arg; /* return original value */ \
46 })
47
48 /* Syscall ENOSYS helper: Avoids unused-parameter warnings and provides a
49 * debugging hook.
50 */
51
52 static __inline__ int __nolibc_enosys(const char *syscall, ...)
53 {
54 (void)syscall;
55 return -ENOSYS;
56 }
57
58
59 /* Functions in this file only describe syscalls. They're declared static so
60 * that the compiler usually decides to inline them while still being allowed
61 * to pass a pointer to one of their instances. Each syscall exists in two
62 * versions:
63 * - the "internal" ones, which matches the raw syscall interface at the
64 * kernel level, which may sometimes slightly differ from the documented
65 * libc-level ones. For example most of them return either a valid value
66 * or -errno. All of these are prefixed with "sys_". They may be called
67 * by non-portable applications if desired.
68 *
69 * - the "exported" ones, whose interface must closely match the one
70 * documented in man(2), that applications are supposed to expect. These
71 * ones rely on the internal ones, and set errno.
72 *
73 * Each syscall will be defined with the two functions, sorted in alphabetical
74 * order applied to the exported names.
75 *
76 * In case of doubt about the relevance of a function here, only those which
77 * set errno should be defined here. Wrappers like those appearing in man(3)
78 * should not be placed here.
79 */
80
81
82 /*
83 * int brk(void *addr);
84 * void *sbrk(intptr_t inc)
85 */
86
87 static __attribute__((unused))
88 void *sys_brk(void *addr)
89 {
90 return (void *)my_syscall1(__NR_brk, addr);
91 }
92
93 static __attribute__((unused))
94 int brk(void *addr)
95 {
96 void *ret = sys_brk(addr);
97
98 if (!ret) {
99 SET_ERRNO(ENOMEM);
100 return -1;
101 }
102 return 0;
103 }
104
105 static __attribute__((unused))
106 void *sbrk(intptr_t inc)
107 {
108 /* first call to find current end */
109 void *ret = sys_brk(0);
110
111 if (ret && sys_brk(ret + inc) == ret + inc)
112 return ret + inc;
113
114 SET_ERRNO(ENOMEM);
115 return (void *)-1;
116 }
117
118
119 /*
120 * int chdir(const char *path);
121 */
122
123 static __attribute__((unused))
124 int sys_chdir(const char *path)
125 {
126 return my_syscall1(__NR_chdir, path);
127 }
128
129 static __attribute__((unused))
130 int chdir(const char *path)
131 {
132 return __sysret(sys_chdir(path));
133 }
134
135
136 /*
137 * int chmod(const char *path, mode_t mode);
138 */
139
140 static __attribute__((unused))
141 int sys_chmod(const char *path, mode_t mode)
142 {
143 #ifdef __NR_fchmodat
144 return my_syscall4(__NR_fchmodat, AT_FDCWD, path, mode, 0);
145 #elif defined(__NR_chmod)
146 return my_syscall2(__NR_chmod, path, mode);
147 #else
148 return __nolibc_enosys(__func__, path, mode);
149 #endif
150 }
151
152 static __attribute__((unused))
153 int chmod(const char *path, mode_t mode)
154 {
155 return __sysret(sys_chmod(path, mode));
156 }
157
158
159 /*
160 * int chown(const char *path, uid_t owner, gid_t group);
161 */
162
163 static __attribute__((unused))
164 int sys_chown(const char *path, uid_t owner, gid_t group)
165 {
166 #ifdef __NR_fchownat
167 return my_syscall5(__NR_fchownat, AT_FDCWD, path, owner, group, 0);
168 #elif defined(__NR_chown)
169 return my_syscall3(__NR_chown, path, owner, group);
170 #else
171 return __nolibc_enosys(__func__, path, owner, group);
172 #endif
173 }
174
175 static __attribute__((unused))
176 int chown(const char *path, uid_t owner, gid_t group)
177 {
178 return __sysret(sys_chown(path, owner, group));
179 }
180
181
182 /*
183 * int chroot(const char *path);
184 */
185
186 static __attribute__((unused))
187 int sys_chroot(const char *path)
188 {
189 return my_syscall1(__NR_chroot, path);
190 }
191
192 static __attribute__((unused))
193 int chroot(const char *path)
194 {
195 return __sysret(sys_chroot(path));
196 }
197
198
199 /*
200 * int close(int fd);
201 */
202
203 static __attribute__((unused))
204 int sys_close(int fd)
205 {
206 return my_syscall1(__NR_close, fd);
207 }
208
209 static __attribute__((unused))
210 int close(int fd)
211 {
212 return __sysret(sys_close(fd));
213 }
214
215
216 /*
217 * int dup(int fd);
218 */
219
220 static __attribute__((unused))
221 int sys_dup(int fd)
222 {
223 return my_syscall1(__NR_dup, fd);
224 }
225
226 static __attribute__((unused))
227 int dup(int fd)
228 {
229 return __sysret(sys_dup(fd));
230 }
231
232
233 /*
234 * int dup2(int old, int new);
235 */
236
237 static __attribute__((unused))
238 int sys_dup2(int old, int new)
239 {
240 #ifdef __NR_dup3
241 return my_syscall3(__NR_dup3, old, new, 0);
242 #elif defined(__NR_dup2)
243 return my_syscall2(__NR_dup2, old, new);
244 #else
245 return __nolibc_enosys(__func__, old, new);
246 #endif
247 }
248
249 static __attribute__((unused))
250 int dup2(int old, int new)
251 {
252 return __sysret(sys_dup2(old, new));
253 }
254
255
256 /*
257 * int dup3(int old, int new, int flags);
258 */
259
260 #ifdef __NR_dup3
261 static __attribute__((unused))
262 int sys_dup3(int old, int new, int flags)
263 {
264 return my_syscall3(__NR_dup3, old, new, flags);
265 }
266
267 static __attribute__((unused))
268 int dup3(int old, int new, int flags)
269 {
270 return __sysret(sys_dup3(old, new, flags));
271 }
272 #endif
273
274
275 /*
276 * int execve(const char *filename, char *const argv[], char *const envp[]);
277 */
278
279 static __attribute__((unused))
280 int sys_execve(const char *filename, char *const argv[], char *const envp[])
281 {
282 return my_syscall3(__NR_execve, filename, argv, envp);
283 }
284
285 static __attribute__((unused))
286 int execve(const char *filename, char *const argv[], char *const envp[])
287 {
288 return __sysret(sys_execve(filename, argv, envp));
289 }
290
291
292 /*
293 * void exit(int status);
294 */
295
296 static __attribute__((noreturn,unused))
297 void sys_exit(int status)
298 {
299 my_syscall1(__NR_exit, status & 255);
300 while(1); /* shut the "noreturn" warnings. */
301 }
302
303 static __attribute__((noreturn,unused))
304 void exit(int status)
305 {
306 sys_exit(status);
307 }
308
309
310 /*
311 * pid_t fork(void);
312 */
313
314 #ifndef sys_fork
315 static __attribute__((unused))
316 pid_t sys_fork(void)
317 {
318 #ifdef __NR_clone
319 /* note: some archs only have clone() and not fork(). Different archs
320 * have a different API, but most archs have the flags on first arg and
321 * will not use the rest with no other flag.
322 */
323 return my_syscall5(__NR_clone, SIGCHLD, 0, 0, 0, 0);
324 #elif defined(__NR_fork)
325 return my_syscall0(__NR_fork);
326 #else
327 return __nolibc_enosys(__func__);
328 #endif
329 }
330 #endif
331
332 static __attribute__((unused))
333 pid_t fork(void)
334 {
335 return __sysret(sys_fork());
336 }
337
338
339 /*
340 * int fsync(int fd);
341 */
342
343 static __attribute__((unused))
344 int sys_fsync(int fd)
345 {
346 return my_syscall1(__NR_fsync, fd);
347 }
348
349 static __attribute__((unused))
350 int fsync(int fd)
351 {
352 return __sysret(sys_fsync(fd));
353 }
354
355
356 /*
357 * int getdents64(int fd, struct linux_dirent64 *dirp, int count);
358 */
359
360 static __attribute__((unused))
361 int sys_getdents64(int fd, struct linux_dirent64 *dirp, int count)
362 {
363 return my_syscall3(__NR_getdents64, fd, dirp, count);
364 }
365
366 static __attribute__((unused))
367 int getdents64(int fd, struct linux_dirent64 *dirp, int count)
368 {
369 return __sysret(sys_getdents64(fd, dirp, count));
370 }
371
372
373 /*
374 * uid_t geteuid(void);
375 */
376
377 static __attribute__((unused))
378 uid_t sys_geteuid(void)
379 {
380 #ifdef __NR_geteuid32
381 return my_syscall0(__NR_geteuid32);
382 #else
383 return my_syscall0(__NR_geteuid);
384 #endif
385 }
386
387 static __attribute__((unused))
388 uid_t geteuid(void)
389 {
390 return sys_geteuid();
391 }
392
393
394 /*
395 * pid_t getpgid(pid_t pid);
396 */
397
398 static __attribute__((unused))
399 pid_t sys_getpgid(pid_t pid)
400 {
401 return my_syscall1(__NR_getpgid, pid);
402 }
403
404 static __attribute__((unused))
405 pid_t getpgid(pid_t pid)
406 {
407 return __sysret(sys_getpgid(pid));
408 }
409
410
411 /*
412 * pid_t getpgrp(void);
413 */
414
415 static __attribute__((unused))
416 pid_t sys_getpgrp(void)
417 {
418 return sys_getpgid(0);
419 }
420
421 static __attribute__((unused))
422 pid_t getpgrp(void)
423 {
424 return sys_getpgrp();
425 }
426
427
428 /*
429 * pid_t getpid(void);
430 */
431
432 static __attribute__((unused))
433 pid_t sys_getpid(void)
434 {
435 return my_syscall0(__NR_getpid);
436 }
437
438 static __attribute__((unused))
439 pid_t getpid(void)
440 {
441 return sys_getpid();
442 }
443
444
445 /*
446 * pid_t getppid(void);
447 */
448
449 static __attribute__((unused))
450 pid_t sys_getppid(void)
451 {
452 return my_syscall0(__NR_getppid);
453 }
454
455 static __attribute__((unused))
456 pid_t getppid(void)
457 {
458 return sys_getppid();
459 }
460
461
462 /*
463 * pid_t gettid(void);
464 */
465
466 static __attribute__((unused))
467 pid_t sys_gettid(void)
468 {
469 return my_syscall0(__NR_gettid);
470 }
471
472 static __attribute__((unused))
473 pid_t gettid(void)
474 {
475 return sys_gettid();
476 }
477
478 static unsigned long getauxval(unsigned long key);
479
480 /*
481 * int getpagesize(void);
482 */
483
484 static __attribute__((unused))
485 int getpagesize(void)
486 {
487 return __sysret((int)getauxval(AT_PAGESZ) ?: -ENOENT);
488 }
489
490
491 /*
492 * int gettimeofday(struct timeval *tv, struct timezone *tz);
493 */
494
495 static __attribute__((unused))
496 int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
497 {
498 #ifdef __NR_gettimeofday
499 return my_syscall2(__NR_gettimeofday, tv, tz);
500 #else
501 return __nolibc_enosys(__func__, tv, tz);
502 #endif
503 }
504
505 static __attribute__((unused))
506 int gettimeofday(struct timeval *tv, struct timezone *tz)
507 {
508 return __sysret(sys_gettimeofday(tv, tz));
509 }
510
511
512 /*
513 * uid_t getuid(void);
514 */
515
516 static __attribute__((unused))
517 uid_t sys_getuid(void)
518 {
519 #ifdef __NR_getuid32
520 return my_syscall0(__NR_getuid32);
521 #else
522 return my_syscall0(__NR_getuid);
523 #endif
524 }
525
526 static __attribute__((unused))
527 uid_t getuid(void)
528 {
529 return sys_getuid();
530 }
531
532
533 /*
534 * int ioctl(int fd, unsigned long req, void *value);
535 */
536
537 static __attribute__((unused))
538 int sys_ioctl(int fd, unsigned long req, void *value)
539 {
540 return my_syscall3(__NR_ioctl, fd, req, value);
541 }
542
543 static __attribute__((unused))
544 int ioctl(int fd, unsigned long req, void *value)
545 {
546 return __sysret(sys_ioctl(fd, req, value));
547 }
548
549 /*
550 * int kill(pid_t pid, int signal);
551 */
552
553 static __attribute__((unused))
554 int sys_kill(pid_t pid, int signal)
555 {
556 return my_syscall2(__NR_kill, pid, signal);
557 }
558
559 static __attribute__((unused))
560 int kill(pid_t pid, int signal)
561 {
562 return __sysret(sys_kill(pid, signal));
563 }
564
565
566 /*
567 * int link(const char *old, const char *new);
568 */
569
570 static __attribute__((unused))
571 int sys_link(const char *old, const char *new)
572 {
573 #ifdef __NR_linkat
574 return my_syscall5(__NR_linkat, AT_FDCWD, old, AT_FDCWD, new, 0);
575 #elif defined(__NR_link)
576 return my_syscall2(__NR_link, old, new);
577 #else
578 return __nolibc_enosys(__func__, old, new);
579 #endif
580 }
581
582 static __attribute__((unused))
583 int link(const char *old, const char *new)
584 {
585 return __sysret(sys_link(old, new));
586 }
587
588
589 /*
590 * off_t lseek(int fd, off_t offset, int whence);
591 */
592
593 static __attribute__((unused))
594 off_t sys_lseek(int fd, off_t offset, int whence)
595 {
596 #ifdef __NR_lseek
597 return my_syscall3(__NR_lseek, fd, offset, whence);
598 #else
599 return __nolibc_enosys(__func__, fd, offset, whence);
600 #endif
601 }
602
603 static __attribute__((unused))
604 off_t lseek(int fd, off_t offset, int whence)
605 {
606 return __sysret(sys_lseek(fd, offset, whence));
607 }
608
609
610 /*
611 * int mkdir(const char *path, mode_t mode);
612 */
613
614 static __attribute__((unused))
615 int sys_mkdir(const char *path, mode_t mode)
616 {
617 #ifdef __NR_mkdirat
618 return my_syscall3(__NR_mkdirat, AT_FDCWD, path, mode);
619 #elif defined(__NR_mkdir)
620 return my_syscall2(__NR_mkdir, path, mode);
621 #else
622 return __nolibc_enosys(__func__, path, mode);
623 #endif
624 }
625
626 static __attribute__((unused))
627 int mkdir(const char *path, mode_t mode)
628 {
629 return __sysret(sys_mkdir(path, mode));
630 }
631
632 /*
633 * int rmdir(const char *path);
634 */
635
636 static __attribute__((unused))
637 int sys_rmdir(const char *path)
638 {
639 #ifdef __NR_rmdir
640 return my_syscall1(__NR_rmdir, path);
641 #elif defined(__NR_unlinkat)
642 return my_syscall3(__NR_unlinkat, AT_FDCWD, path, AT_REMOVEDIR);
643 #else
644 return __nolibc_enosys(__func__, path);
645 #endif
646 }
647
648 static __attribute__((unused))
649 int rmdir(const char *path)
650 {
651 return __sysret(sys_rmdir(path));
652 }
653
654
655 /*
656 * int mknod(const char *path, mode_t mode, dev_t dev);
657 */
658
659 static __attribute__((unused))
660 long sys_mknod(const char *path, mode_t mode, dev_t dev)
661 {
662 #ifdef __NR_mknodat
663 return my_syscall4(__NR_mknodat, AT_FDCWD, path, mode, dev);
664 #elif defined(__NR_mknod)
665 return my_syscall3(__NR_mknod, path, mode, dev);
666 #else
667 return __nolibc_enosys(__func__, path, mode, dev);
668 #endif
669 }
670
671 static __attribute__((unused))
672 int mknod(const char *path, mode_t mode, dev_t dev)
673 {
674 return __sysret(sys_mknod(path, mode, dev));
675 }
676
677 #ifndef sys_mmap
678 static __attribute__((unused))
679 void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
680 off_t offset)
681 {
682 int n;
683
684 #if defined(__NR_mmap2)
685 n = __NR_mmap2;
686 offset >>= 12;
687 #else
688 n = __NR_mmap;
689 #endif
690
691 return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
692 }
693 #endif
694
695 /* Note that on Linux, MAP_FAILED is -1 so we can use the generic __sysret()
696 * which returns -1 upon error and still satisfy user land that checks for
697 * MAP_FAILED.
698 */
699
700 static __attribute__((unused))
701 void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
702 {
703 void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
704
705 if ((unsigned long)ret >= -4095UL) {
706 SET_ERRNO(-(long)ret);
707 ret = MAP_FAILED;
708 }
709 return ret;
710 }
711
712 static __attribute__((unused))
713 int sys_munmap(void *addr, size_t length)
714 {
715 return my_syscall2(__NR_munmap, addr, length);
716 }
717
718 static __attribute__((unused))
719 int munmap(void *addr, size_t length)
720 {
721 return __sysret(sys_munmap(addr, length));
722 }
723
724 /*
725 * int mount(const char *source, const char *target,
726 * const char *fstype, unsigned long flags,
727 * const void *data);
728 */
729 static __attribute__((unused))
730 int sys_mount(const char *src, const char *tgt, const char *fst,
731 unsigned long flags, const void *data)
732 {
733 return my_syscall5(__NR_mount, src, tgt, fst, flags, data);
734 }
735
736 static __attribute__((unused))
737 int mount(const char *src, const char *tgt,
738 const char *fst, unsigned long flags,
739 const void *data)
740 {
741 return __sysret(sys_mount(src, tgt, fst, flags, data));
742 }
743
744
745 /*
746 * int open(const char *path, int flags[, mode_t mode]);
747 */
748
749 static __attribute__((unused))
750 int sys_open(const char *path, int flags, mode_t mode)
751 {
752 #ifdef __NR_openat
753 return my_syscall4(__NR_openat, AT_FDCWD, path, flags, mode);
754 #elif defined(__NR_open)
755 return my_syscall3(__NR_open, path, flags, mode);
756 #else
757 return __nolibc_enosys(__func__, path, flags, mode);
758 #endif
759 }
760
761 static __attribute__((unused))
762 int open(const char *path, int flags, ...)
763 {
764 mode_t mode = 0;
765
766 if (flags & O_CREAT) {
767 va_list args;
768
769 va_start(args, flags);
770 mode = va_arg(args, int);
771 va_end(args);
772 }
773
774 return __sysret(sys_open(path, flags, mode));
775 }
776
777
778 /*
779 * int pipe2(int pipefd[2], int flags);
780 * int pipe(int pipefd[2]);
781 */
782
783 static __attribute__((unused))
784 int sys_pipe2(int pipefd[2], int flags)
785 {
786 return my_syscall2(__NR_pipe2, pipefd, flags);
787 }
788
789 static __attribute__((unused))
790 int pipe2(int pipefd[2], int flags)
791 {
792 return __sysret(sys_pipe2(pipefd, flags));
793 }
794
795 static __attribute__((unused))
796 int pipe(int pipefd[2])
797 {
798 return pipe2(pipefd, 0);
799 }
800
801
802 /*
803 * int prctl(int option, unsigned long arg2, unsigned long arg3,
804 * unsigned long arg4, unsigned long arg5);
805 */
806
807 static __attribute__((unused))
808 int sys_prctl(int option, unsigned long arg2, unsigned long arg3,
809 unsigned long arg4, unsigned long arg5)
810 {
811 return my_syscall5(__NR_prctl, option, arg2, arg3, arg4, arg5);
812 }
813
814 static __attribute__((unused))
815 int prctl(int option, unsigned long arg2, unsigned long arg3,
816 unsigned long arg4, unsigned long arg5)
817 {
818 return __sysret(sys_prctl(option, arg2, arg3, arg4, arg5));
819 }
820
821
822 /*
823 * int pivot_root(const char *new, const char *old);
824 */
825
826 static __attribute__((unused))
827 int sys_pivot_root(const char *new, const char *old)
828 {
829 return my_syscall2(__NR_pivot_root, new, old);
830 }
831
832 static __attribute__((unused))
833 int pivot_root(const char *new, const char *old)
834 {
835 return __sysret(sys_pivot_root(new, old));
836 }
837
838
839 /*
840 * int poll(struct pollfd *fds, int nfds, int timeout);
841 */
842
843 static __attribute__((unused))
844 int sys_poll(struct pollfd *fds, int nfds, int timeout)
845 {
846 #if defined(__NR_ppoll)
847 struct timespec t;
848
849 if (timeout >= 0) {
850 t.tv_sec = timeout / 1000;
851 t.tv_nsec = (timeout % 1000) * 1000000;
852 }
853 return my_syscall5(__NR_ppoll, fds, nfds, (timeout >= 0) ? &t : NULL, NULL, 0);
854 #elif defined(__NR_poll)
855 return my_syscall3(__NR_poll, fds, nfds, timeout);
856 #else
857 return __nolibc_enosys(__func__, fds, nfds, timeout);
858 #endif
859 }
860
861 static __attribute__((unused))
862 int poll(struct pollfd *fds, int nfds, int timeout)
863 {
864 return __sysret(sys_poll(fds, nfds, timeout));
865 }
866
867
868 /*
869 * ssize_t read(int fd, void *buf, size_t count);
870 */
871
872 static __attribute__((unused))
873 ssize_t sys_read(int fd, void *buf, size_t count)
874 {
875 return my_syscall3(__NR_read, fd, buf, count);
876 }
877
878 static __attribute__((unused))
879 ssize_t read(int fd, void *buf, size_t count)
880 {
881 return __sysret(sys_read(fd, buf, count));
882 }
883
884
885 /*
886 * int reboot(int cmd);
887 * <cmd> is among LINUX_REBOOT_CMD_*
888 */
889
890 static __attribute__((unused))
891 ssize_t sys_reboot(int magic1, int magic2, int cmd, void *arg)
892 {
893 return my_syscall4(__NR_reboot, magic1, magic2, cmd, arg);
894 }
895
896 static __attribute__((unused))
897 int reboot(int cmd)
898 {
899 return __sysret(sys_reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, 0));
900 }
901
902
903 /*
904 * int getrlimit(int resource, struct rlimit *rlim);
905 * int setrlimit(int resource, const struct rlimit *rlim);
906 */
907
908 static __attribute__((unused))
909 int sys_prlimit64(pid_t pid, int resource,
910 const struct rlimit64 *new_limit, struct rlimit64 *old_limit)
911 {
912 return my_syscall4(__NR_prlimit64, pid, resource, new_limit, old_limit);
913 }
914
915 static __attribute__((unused))
916 int getrlimit(int resource, struct rlimit *rlim)
917 {
918 struct rlimit64 rlim64;
919 int ret;
920
921 ret = __sysret(sys_prlimit64(0, resource, NULL, &rlim64));
922 rlim->rlim_cur = rlim64.rlim_cur;
923 rlim->rlim_max = rlim64.rlim_max;
924
925 return ret;
926 }
927
928 static __attribute__((unused))
929 int setrlimit(int resource, const struct rlimit *rlim)
930 {
931 struct rlimit64 rlim64 = {
932 .rlim_cur = rlim->rlim_cur,
933 .rlim_max = rlim->rlim_max,
934 };
935
936 return __sysret(sys_prlimit64(0, resource, &rlim64, NULL));
937 }
938
939
940 /*
941 * int sched_yield(void);
942 */
943
944 static __attribute__((unused))
945 int sys_sched_yield(void)
946 {
947 return my_syscall0(__NR_sched_yield);
948 }
949
950 static __attribute__((unused))
951 int sched_yield(void)
952 {
953 return __sysret(sys_sched_yield());
954 }
955
956
957 /*
958 * int select(int nfds, fd_set *read_fds, fd_set *write_fds,
959 * fd_set *except_fds, struct timeval *timeout);
960 */
961
962 static __attribute__((unused))
963 int sys_select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout)
964 {
965 #if defined(__ARCH_WANT_SYS_OLD_SELECT) && !defined(__NR__newselect)
966 struct sel_arg_struct {
967 unsigned long n;
968 fd_set *r, *w, *e;
969 struct timeval *t;
970 } arg = { .n = nfds, .r = rfds, .w = wfds, .e = efds, .t = timeout };
971 return my_syscall1(__NR_select, &arg);
972 #elif defined(__NR__newselect)
973 return my_syscall5(__NR__newselect, nfds, rfds, wfds, efds, timeout);
974 #elif defined(__NR_select)
975 return my_syscall5(__NR_select, nfds, rfds, wfds, efds, timeout);
976 #elif defined(__NR_pselect6)
977 struct timespec t;
978
979 if (timeout) {
980 t.tv_sec = timeout->tv_sec;
981 t.tv_nsec = timeout->tv_usec * 1000;
982 }
983 return my_syscall6(__NR_pselect6, nfds, rfds, wfds, efds, timeout ? &t : NULL, NULL);
984 #else
985 return __nolibc_enosys(__func__, nfds, rfds, wfds, efds, timeout);
986 #endif
987 }
988
989 static __attribute__((unused))
990 int select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout)
991 {
992 return __sysret(sys_select(nfds, rfds, wfds, efds, timeout));
993 }
994
995
996 /*
997 * int setpgid(pid_t pid, pid_t pgid);
998 */
999
1000 static __attribute__((unused))
1001 int sys_setpgid(pid_t pid, pid_t pgid)
1002 {
1003 return my_syscall2(__NR_setpgid, pid, pgid);
1004 }
1005
1006 static __attribute__((unused))
1007 int setpgid(pid_t pid, pid_t pgid)
1008 {
1009 return __sysret(sys_setpgid(pid, pgid));
1010 }
1011
1012
1013 /*
1014 * pid_t setsid(void);
1015 */
1016
1017 static __attribute__((unused))
1018 pid_t sys_setsid(void)
1019 {
1020 return my_syscall0(__NR_setsid);
1021 }
1022
1023 static __attribute__((unused))
1024 pid_t setsid(void)
1025 {
1026 return __sysret(sys_setsid());
1027 }
1028
1029 /*
1030 * int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf);
1031 * int stat(const char *path, struct stat *buf);
1032 */
1033
1034 static __attribute__((unused))
1035 int sys_statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
1036 {
1037 #ifdef __NR_statx
1038 return my_syscall5(__NR_statx, fd, path, flags, mask, buf);
1039 #else
1040 return __nolibc_enosys(__func__, fd, path, flags, mask, buf);
1041 #endif
1042 }
1043
1044 static __attribute__((unused))
1045 int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
1046 {
1047 return __sysret(sys_statx(fd, path, flags, mask, buf));
1048 }
1049
1050
1051 static __attribute__((unused))
1052 int stat(const char *path, struct stat *buf)
1053 {
1054 struct statx statx;
1055 long ret;
1056
1057 ret = __sysret(sys_statx(AT_FDCWD, path, AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &statx));
1058 if (ret == -1)
1059 return ret;
1060
1061 buf->st_dev = ((statx.stx_dev_minor & 0xff)
1062 | (statx.stx_dev_major << 8)
1063 | ((statx.stx_dev_minor & ~0xff) << 12));
1064 buf->st_ino = statx.stx_ino;
1065 buf->st_mode = statx.stx_mode;
1066 buf->st_nlink = statx.stx_nlink;
1067 buf->st_uid = statx.stx_uid;
1068 buf->st_gid = statx.stx_gid;
1069 buf->st_rdev = ((statx.stx_rdev_minor & 0xff)
1070 | (statx.stx_rdev_major << 8)
1071 | ((statx.stx_rdev_minor & ~0xff) << 12));
1072 buf->st_size = statx.stx_size;
1073 buf->st_blksize = statx.stx_blksize;
1074 buf->st_blocks = statx.stx_blocks;
1075 buf->st_atim.tv_sec = statx.stx_atime.tv_sec;
1076 buf->st_atim.tv_nsec = statx.stx_atime.tv_nsec;
1077 buf->st_mtim.tv_sec = statx.stx_mtime.tv_sec;
1078 buf->st_mtim.tv_nsec = statx.stx_mtime.tv_nsec;
1079 buf->st_ctim.tv_sec = statx.stx_ctime.tv_sec;
1080 buf->st_ctim.tv_nsec = statx.stx_ctime.tv_nsec;
1081
1082 return 0;
1083 }
1084
1085
1086 /*
1087 * int symlink(const char *old, const char *new);
1088 */
1089
1090 static __attribute__((unused))
1091 int sys_symlink(const char *old, const char *new)
1092 {
1093 #ifdef __NR_symlinkat
1094 return my_syscall3(__NR_symlinkat, old, AT_FDCWD, new);
1095 #elif defined(__NR_symlink)
1096 return my_syscall2(__NR_symlink, old, new);
1097 #else
1098 return __nolibc_enosys(__func__, old, new);
1099 #endif
1100 }
1101
1102 static __attribute__((unused))
1103 int symlink(const char *old, const char *new)
1104 {
1105 return __sysret(sys_symlink(old, new));
1106 }
1107
1108
1109 /*
1110 * mode_t umask(mode_t mode);
1111 */
1112
1113 static __attribute__((unused))
1114 mode_t sys_umask(mode_t mode)
1115 {
1116 return my_syscall1(__NR_umask, mode);
1117 }
1118
1119 static __attribute__((unused))
1120 mode_t umask(mode_t mode)
1121 {
1122 return sys_umask(mode);
1123 }
1124
1125
1126 /*
1127 * int umount2(const char *path, int flags);
1128 */
1129
1130 static __attribute__((unused))
1131 int sys_umount2(const char *path, int flags)
1132 {
1133 return my_syscall2(__NR_umount2, path, flags);
1134 }
1135
1136 static __attribute__((unused))
1137 int umount2(const char *path, int flags)
1138 {
1139 return __sysret(sys_umount2(path, flags));
1140 }
1141
1142
1143 /*
1144 * int uname(struct utsname *buf);
1145 */
1146
1147 struct utsname {
1148 char sysname[65];
1149 char nodename[65];
1150 char release[65];
1151 char version[65];
1152 char machine[65];
1153 char domainname[65];
1154 };
1155
1156 static __attribute__((unused))
1157 int sys_uname(struct utsname *buf)
1158 {
1159 return my_syscall1(__NR_uname, buf);
1160 }
1161
1162 static __attribute__((unused))
1163 int uname(struct utsname *buf)
1164 {
1165 return __sysret(sys_uname(buf));
1166 }
1167
1168
1169 /*
1170 * int unlink(const char *path);
1171 */
1172
1173 static __attribute__((unused))
1174 int sys_unlink(const char *path)
1175 {
1176 #ifdef __NR_unlinkat
1177 return my_syscall3(__NR_unlinkat, AT_FDCWD, path, 0);
1178 #elif defined(__NR_unlink)
1179 return my_syscall1(__NR_unlink, path);
1180 #else
1181 return __nolibc_enosys(__func__, path);
1182 #endif
1183 }
1184
1185 static __attribute__((unused))
1186 int unlink(const char *path)
1187 {
1188 return __sysret(sys_unlink(path));
1189 }
1190
1191
1192 /*
1193 * pid_t wait(int *status);
1194 * pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage);
1195 * pid_t waitpid(pid_t pid, int *status, int options);
1196 */
1197
1198 static __attribute__((unused))
1199 pid_t sys_wait4(pid_t pid, int *status, int options, struct rusage *rusage)
1200 {
1201 #ifdef __NR_wait4
1202 return my_syscall4(__NR_wait4, pid, status, options, rusage);
1203 #else
1204 return __nolibc_enosys(__func__, pid, status, options, rusage);
1205 #endif
1206 }
1207
1208 static __attribute__((unused))
1209 pid_t wait(int *status)
1210 {
1211 return __sysret(sys_wait4(-1, status, 0, NULL));
1212 }
1213
1214 static __attribute__((unused))
1215 pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage)
1216 {
1217 return __sysret(sys_wait4(pid, status, options, rusage));
1218 }
1219
1220
1221 static __attribute__((unused))
1222 pid_t waitpid(pid_t pid, int *status, int options)
1223 {
1224 return __sysret(sys_wait4(pid, status, options, NULL));
1225 }
1226
1227
1228 /*
1229 * ssize_t write(int fd, const void *buf, size_t count);
1230 */
1231
1232 static __attribute__((unused))
1233 ssize_t sys_write(int fd, const void *buf, size_t count)
1234 {
1235 return my_syscall3(__NR_write, fd, buf, count);
1236 }
1237
1238 static __attribute__((unused))
1239 ssize_t write(int fd, const void *buf, size_t count)
1240 {
1241 return __sysret(sys_write(fd, buf, count));
1242 }
1243
1244
1245 /*
1246 * int memfd_create(const char *name, unsigned int flags);
1247 */
1248
1249 static __attribute__((unused))
1250 int sys_memfd_create(const char *name, unsigned int flags)
1251 {
1252 return my_syscall2(__NR_memfd_create, name, flags);
1253 }
1254
1255 static __attribute__((unused))
1256 int memfd_create(const char *name, unsigned int flags)
1257 {
1258 return __sysret(sys_memfd_create(name, flags));
1259 }
1260
1261 /* make sure to include all global symbols */
1262 #include "nolibc.h"
1263
1264 #endif /* _NOLIBC_SYS_H */
1265
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.