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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 <stdarg.h>
11#include "std.h"
12
13/* system includes */
14#include <asm/unistd.h>
15#include <asm/signal.h> // for SIGCHLD
16#include <asm/ioctls.h>
17#include <asm/mman.h>
18#include <linux/fs.h>
19#include <linux/loop.h>
20#include <linux/time.h>
21
22#include "arch.h"
23#include "errno.h"
24#include "types.h"
25
26
27/* Functions in this file only describe syscalls. They're declared static so
28 * that the compiler usually decides to inline them while still being allowed
29 * to pass a pointer to one of their instances. Each syscall exists in two
30 * versions:
31 * - the "internal" ones, which matches the raw syscall interface at the
32 * kernel level, which may sometimes slightly differ from the documented
33 * libc-level ones. For example most of them return either a valid value
34 * or -errno. All of these are prefixed with "sys_". They may be called
35 * by non-portable applications if desired.
36 *
37 * - the "exported" ones, whose interface must closely match the one
38 * documented in man(2), that applications are supposed to expect. These
39 * ones rely on the internal ones, and set errno.
40 *
41 * Each syscall will be defined with the two functions, sorted in alphabetical
42 * order applied to the exported names.
43 *
44 * In case of doubt about the relevance of a function here, only those which
45 * set errno should be defined here. Wrappers like those appearing in man(3)
46 * should not be placed here.
47 */
48
49
50/*
51 * int brk(void *addr);
52 * void *sbrk(intptr_t inc)
53 */
54
55static __attribute__((unused))
56void *sys_brk(void *addr)
57{
58 return (void *)my_syscall1(__NR_brk, addr);
59}
60
61static __attribute__((unused))
62int brk(void *addr)
63{
64 void *ret = sys_brk(addr);
65
66 if (!ret) {
67 SET_ERRNO(ENOMEM);
68 return -1;
69 }
70 return 0;
71}
72
73static __attribute__((unused))
74void *sbrk(intptr_t inc)
75{
76 void *ret;
77
78 /* first call to find current end */
79 if ((ret = sys_brk(0)) && (sys_brk(ret + inc) == ret + inc))
80 return ret + inc;
81
82 SET_ERRNO(ENOMEM);
83 return (void *)-1;
84}
85
86
87/*
88 * int chdir(const char *path);
89 */
90
91static __attribute__((unused))
92int sys_chdir(const char *path)
93{
94 return my_syscall1(__NR_chdir, path);
95}
96
97static __attribute__((unused))
98int chdir(const char *path)
99{
100 int ret = sys_chdir(path);
101
102 if (ret < 0) {
103 SET_ERRNO(-ret);
104 ret = -1;
105 }
106 return ret;
107}
108
109
110/*
111 * int chmod(const char *path, mode_t mode);
112 */
113
114static __attribute__((unused))
115int sys_chmod(const char *path, mode_t mode)
116{
117#ifdef __NR_fchmodat
118 return my_syscall4(__NR_fchmodat, AT_FDCWD, path, mode, 0);
119#elif defined(__NR_chmod)
120 return my_syscall2(__NR_chmod, path, mode);
121#else
122#error Neither __NR_fchmodat nor __NR_chmod defined, cannot implement sys_chmod()
123#endif
124}
125
126static __attribute__((unused))
127int chmod(const char *path, mode_t mode)
128{
129 int ret = sys_chmod(path, mode);
130
131 if (ret < 0) {
132 SET_ERRNO(-ret);
133 ret = -1;
134 }
135 return ret;
136}
137
138
139/*
140 * int chown(const char *path, uid_t owner, gid_t group);
141 */
142
143static __attribute__((unused))
144int sys_chown(const char *path, uid_t owner, gid_t group)
145{
146#ifdef __NR_fchownat
147 return my_syscall5(__NR_fchownat, AT_FDCWD, path, owner, group, 0);
148#elif defined(__NR_chown)
149 return my_syscall3(__NR_chown, path, owner, group);
150#else
151#error Neither __NR_fchownat nor __NR_chown defined, cannot implement sys_chown()
152#endif
153}
154
155static __attribute__((unused))
156int chown(const char *path, uid_t owner, gid_t group)
157{
158 int ret = sys_chown(path, owner, group);
159
160 if (ret < 0) {
161 SET_ERRNO(-ret);
162 ret = -1;
163 }
164 return ret;
165}
166
167
168/*
169 * int chroot(const char *path);
170 */
171
172static __attribute__((unused))
173int sys_chroot(const char *path)
174{
175 return my_syscall1(__NR_chroot, path);
176}
177
178static __attribute__((unused))
179int chroot(const char *path)
180{
181 int ret = sys_chroot(path);
182
183 if (ret < 0) {
184 SET_ERRNO(-ret);
185 ret = -1;
186 }
187 return ret;
188}
189
190
191/*
192 * int close(int fd);
193 */
194
195static __attribute__((unused))
196int sys_close(int fd)
197{
198 return my_syscall1(__NR_close, fd);
199}
200
201static __attribute__((unused))
202int close(int fd)
203{
204 int ret = sys_close(fd);
205
206 if (ret < 0) {
207 SET_ERRNO(-ret);
208 ret = -1;
209 }
210 return ret;
211}
212
213
214/*
215 * int dup(int fd);
216 */
217
218static __attribute__((unused))
219int sys_dup(int fd)
220{
221 return my_syscall1(__NR_dup, fd);
222}
223
224static __attribute__((unused))
225int dup(int fd)
226{
227 int ret = sys_dup(fd);
228
229 if (ret < 0) {
230 SET_ERRNO(-ret);
231 ret = -1;
232 }
233 return ret;
234}
235
236
237/*
238 * int dup2(int old, int new);
239 */
240
241static __attribute__((unused))
242int sys_dup2(int old, int new)
243{
244#ifdef __NR_dup3
245 return my_syscall3(__NR_dup3, old, new, 0);
246#elif defined(__NR_dup2)
247 return my_syscall2(__NR_dup2, old, new);
248#else
249#error Neither __NR_dup3 nor __NR_dup2 defined, cannot implement sys_dup2()
250#endif
251}
252
253static __attribute__((unused))
254int dup2(int old, int new)
255{
256 int ret = sys_dup2(old, new);
257
258 if (ret < 0) {
259 SET_ERRNO(-ret);
260 ret = -1;
261 }
262 return ret;
263}
264
265
266/*
267 * int dup3(int old, int new, int flags);
268 */
269
270#ifdef __NR_dup3
271static __attribute__((unused))
272int sys_dup3(int old, int new, int flags)
273{
274 return my_syscall3(__NR_dup3, old, new, flags);
275}
276
277static __attribute__((unused))
278int dup3(int old, int new, int flags)
279{
280 int ret = sys_dup3(old, new, flags);
281
282 if (ret < 0) {
283 SET_ERRNO(-ret);
284 ret = -1;
285 }
286 return ret;
287}
288#endif
289
290
291/*
292 * int execve(const char *filename, char *const argv[], char *const envp[]);
293 */
294
295static __attribute__((unused))
296int sys_execve(const char *filename, char *const argv[], char *const envp[])
297{
298 return my_syscall3(__NR_execve, filename, argv, envp);
299}
300
301static __attribute__((unused))
302int execve(const char *filename, char *const argv[], char *const envp[])
303{
304 int ret = sys_execve(filename, argv, envp);
305
306 if (ret < 0) {
307 SET_ERRNO(-ret);
308 ret = -1;
309 }
310 return ret;
311}
312
313
314/*
315 * void exit(int status);
316 */
317
318static __attribute__((noreturn,unused))
319void sys_exit(int status)
320{
321 my_syscall1(__NR_exit, status & 255);
322 while(1); // shut the "noreturn" warnings.
323}
324
325static __attribute__((noreturn,unused))
326void exit(int status)
327{
328 sys_exit(status);
329}
330
331
332/*
333 * pid_t fork(void);
334 */
335
336static __attribute__((unused))
337pid_t sys_fork(void)
338{
339#ifdef __NR_clone
340 /* note: some archs only have clone() and not fork(). Different archs
341 * have a different API, but most archs have the flags on first arg and
342 * will not use the rest with no other flag.
343 */
344 return my_syscall5(__NR_clone, SIGCHLD, 0, 0, 0, 0);
345#elif defined(__NR_fork)
346 return my_syscall0(__NR_fork);
347#else
348#error Neither __NR_clone nor __NR_fork defined, cannot implement sys_fork()
349#endif
350}
351
352static __attribute__((unused))
353pid_t fork(void)
354{
355 pid_t ret = sys_fork();
356
357 if (ret < 0) {
358 SET_ERRNO(-ret);
359 ret = -1;
360 }
361 return ret;
362}
363
364
365/*
366 * int fsync(int fd);
367 */
368
369static __attribute__((unused))
370int sys_fsync(int fd)
371{
372 return my_syscall1(__NR_fsync, fd);
373}
374
375static __attribute__((unused))
376int fsync(int fd)
377{
378 int ret = sys_fsync(fd);
379
380 if (ret < 0) {
381 SET_ERRNO(-ret);
382 ret = -1;
383 }
384 return ret;
385}
386
387
388/*
389 * int getdents64(int fd, struct linux_dirent64 *dirp, int count);
390 */
391
392static __attribute__((unused))
393int sys_getdents64(int fd, struct linux_dirent64 *dirp, int count)
394{
395 return my_syscall3(__NR_getdents64, fd, dirp, count);
396}
397
398static __attribute__((unused))
399int getdents64(int fd, struct linux_dirent64 *dirp, int count)
400{
401 int ret = sys_getdents64(fd, dirp, count);
402
403 if (ret < 0) {
404 SET_ERRNO(-ret);
405 ret = -1;
406 }
407 return ret;
408}
409
410
411/*
412 * pid_t getpgid(pid_t pid);
413 */
414
415static __attribute__((unused))
416pid_t sys_getpgid(pid_t pid)
417{
418 return my_syscall1(__NR_getpgid, pid);
419}
420
421static __attribute__((unused))
422pid_t getpgid(pid_t pid)
423{
424 pid_t ret = sys_getpgid(pid);
425
426 if (ret < 0) {
427 SET_ERRNO(-ret);
428 ret = -1;
429 }
430 return ret;
431}
432
433
434/*
435 * pid_t getpgrp(void);
436 */
437
438static __attribute__((unused))
439pid_t sys_getpgrp(void)
440{
441 return sys_getpgid(0);
442}
443
444static __attribute__((unused))
445pid_t getpgrp(void)
446{
447 return sys_getpgrp();
448}
449
450
451/*
452 * pid_t getpid(void);
453 */
454
455static __attribute__((unused))
456pid_t sys_getpid(void)
457{
458 return my_syscall0(__NR_getpid);
459}
460
461static __attribute__((unused))
462pid_t getpid(void)
463{
464 return sys_getpid();
465}
466
467
468/*
469 * pid_t getppid(void);
470 */
471
472static __attribute__((unused))
473pid_t sys_getppid(void)
474{
475 return my_syscall0(__NR_getppid);
476}
477
478static __attribute__((unused))
479pid_t getppid(void)
480{
481 return sys_getppid();
482}
483
484
485/*
486 * pid_t gettid(void);
487 */
488
489static __attribute__((unused))
490pid_t sys_gettid(void)
491{
492 return my_syscall0(__NR_gettid);
493}
494
495static __attribute__((unused))
496pid_t gettid(void)
497{
498 return sys_gettid();
499}
500
501
502/*
503 * int gettimeofday(struct timeval *tv, struct timezone *tz);
504 */
505
506static __attribute__((unused))
507int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
508{
509 return my_syscall2(__NR_gettimeofday, tv, tz);
510}
511
512static __attribute__((unused))
513int gettimeofday(struct timeval *tv, struct timezone *tz)
514{
515 int ret = sys_gettimeofday(tv, tz);
516
517 if (ret < 0) {
518 SET_ERRNO(-ret);
519 ret = -1;
520 }
521 return ret;
522}
523
524
525/*
526 * int ioctl(int fd, unsigned long req, void *value);
527 */
528
529static __attribute__((unused))
530int sys_ioctl(int fd, unsigned long req, void *value)
531{
532 return my_syscall3(__NR_ioctl, fd, req, value);
533}
534
535static __attribute__((unused))
536int ioctl(int fd, unsigned long req, void *value)
537{
538 int ret = sys_ioctl(fd, req, value);
539
540 if (ret < 0) {
541 SET_ERRNO(-ret);
542 ret = -1;
543 }
544 return ret;
545}
546
547/*
548 * int kill(pid_t pid, int signal);
549 */
550
551static __attribute__((unused))
552int sys_kill(pid_t pid, int signal)
553{
554 return my_syscall2(__NR_kill, pid, signal);
555}
556
557static __attribute__((unused))
558int kill(pid_t pid, int signal)
559{
560 int ret = sys_kill(pid, signal);
561
562 if (ret < 0) {
563 SET_ERRNO(-ret);
564 ret = -1;
565 }
566 return ret;
567}
568
569
570/*
571 * int link(const char *old, const char *new);
572 */
573
574static __attribute__((unused))
575int sys_link(const char *old, const char *new)
576{
577#ifdef __NR_linkat
578 return my_syscall5(__NR_linkat, AT_FDCWD, old, AT_FDCWD, new, 0);
579#elif defined(__NR_link)
580 return my_syscall2(__NR_link, old, new);
581#else
582#error Neither __NR_linkat nor __NR_link defined, cannot implement sys_link()
583#endif
584}
585
586static __attribute__((unused))
587int link(const char *old, const char *new)
588{
589 int ret = sys_link(old, new);
590
591 if (ret < 0) {
592 SET_ERRNO(-ret);
593 ret = -1;
594 }
595 return ret;
596}
597
598
599/*
600 * off_t lseek(int fd, off_t offset, int whence);
601 */
602
603static __attribute__((unused))
604off_t sys_lseek(int fd, off_t offset, int whence)
605{
606 return my_syscall3(__NR_lseek, fd, offset, whence);
607}
608
609static __attribute__((unused))
610off_t lseek(int fd, off_t offset, int whence)
611{
612 off_t ret = sys_lseek(fd, offset, whence);
613
614 if (ret < 0) {
615 SET_ERRNO(-ret);
616 ret = -1;
617 }
618 return ret;
619}
620
621
622/*
623 * int mkdir(const char *path, mode_t mode);
624 */
625
626static __attribute__((unused))
627int sys_mkdir(const char *path, mode_t mode)
628{
629#ifdef __NR_mkdirat
630 return my_syscall3(__NR_mkdirat, AT_FDCWD, path, mode);
631#elif defined(__NR_mkdir)
632 return my_syscall2(__NR_mkdir, path, mode);
633#else
634#error Neither __NR_mkdirat nor __NR_mkdir defined, cannot implement sys_mkdir()
635#endif
636}
637
638static __attribute__((unused))
639int mkdir(const char *path, mode_t mode)
640{
641 int ret = sys_mkdir(path, mode);
642
643 if (ret < 0) {
644 SET_ERRNO(-ret);
645 ret = -1;
646 }
647 return ret;
648}
649
650
651/*
652 * int mknod(const char *path, mode_t mode, dev_t dev);
653 */
654
655static __attribute__((unused))
656long sys_mknod(const char *path, mode_t mode, dev_t dev)
657{
658#ifdef __NR_mknodat
659 return my_syscall4(__NR_mknodat, AT_FDCWD, path, mode, dev);
660#elif defined(__NR_mknod)
661 return my_syscall3(__NR_mknod, path, mode, dev);
662#else
663#error Neither __NR_mknodat nor __NR_mknod defined, cannot implement sys_mknod()
664#endif
665}
666
667static __attribute__((unused))
668int mknod(const char *path, mode_t mode, dev_t dev)
669{
670 int ret = sys_mknod(path, mode, dev);
671
672 if (ret < 0) {
673 SET_ERRNO(-ret);
674 ret = -1;
675 }
676 return ret;
677}
678
679#ifndef MAP_SHARED
680#define MAP_SHARED 0x01 /* Share changes */
681#define MAP_PRIVATE 0x02 /* Changes are private */
682#define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */
683#endif
684
685#ifndef MAP_FAILED
686#define MAP_FAILED ((void *)-1)
687#endif
688
689static __attribute__((unused))
690void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
691 off_t offset)
692{
693#ifndef my_syscall6
694 /* Function not implemented. */
695 return (void *)-ENOSYS;
696#else
697
698 int n;
699
700#if defined(__NR_mmap2)
701 n = __NR_mmap2;
702 offset >>= 12;
703#else
704 n = __NR_mmap;
705#endif
706
707 return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
708#endif
709}
710
711static __attribute__((unused))
712void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
713{
714 void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
715
716 if ((unsigned long)ret >= -4095UL) {
717 SET_ERRNO(-(long)ret);
718 ret = MAP_FAILED;
719 }
720 return ret;
721}
722
723static __attribute__((unused))
724int sys_munmap(void *addr, size_t length)
725{
726 return my_syscall2(__NR_munmap, addr, length);
727}
728
729static __attribute__((unused))
730int munmap(void *addr, size_t length)
731{
732 int ret = sys_munmap(addr, length);
733
734 if (ret < 0) {
735 SET_ERRNO(-ret);
736 ret = -1;
737 }
738 return ret;
739}
740
741/*
742 * int mount(const char *source, const char *target,
743 * const char *fstype, unsigned long flags,
744 * const void *data);
745 */
746static __attribute__((unused))
747int sys_mount(const char *src, const char *tgt, const char *fst,
748 unsigned long flags, const void *data)
749{
750 return my_syscall5(__NR_mount, src, tgt, fst, flags, data);
751}
752
753static __attribute__((unused))
754int mount(const char *src, const char *tgt,
755 const char *fst, unsigned long flags,
756 const void *data)
757{
758 int ret = sys_mount(src, tgt, fst, flags, data);
759
760 if (ret < 0) {
761 SET_ERRNO(-ret);
762 ret = -1;
763 }
764 return ret;
765}
766
767
768/*
769 * int open(const char *path, int flags[, mode_t mode]);
770 */
771
772static __attribute__((unused))
773int sys_open(const char *path, int flags, mode_t mode)
774{
775#ifdef __NR_openat
776 return my_syscall4(__NR_openat, AT_FDCWD, path, flags, mode);
777#elif defined(__NR_open)
778 return my_syscall3(__NR_open, path, flags, mode);
779#else
780#error Neither __NR_openat nor __NR_open defined, cannot implement sys_open()
781#endif
782}
783
784static __attribute__((unused))
785int open(const char *path, int flags, ...)
786{
787 mode_t mode = 0;
788 int ret;
789
790 if (flags & O_CREAT) {
791 va_list args;
792
793 va_start(args, flags);
794 mode = va_arg(args, mode_t);
795 va_end(args);
796 }
797
798 ret = sys_open(path, flags, mode);
799
800 if (ret < 0) {
801 SET_ERRNO(-ret);
802 ret = -1;
803 }
804 return ret;
805}
806
807
808/*
809 * int pivot_root(const char *new, const char *old);
810 */
811
812static __attribute__((unused))
813int sys_pivot_root(const char *new, const char *old)
814{
815 return my_syscall2(__NR_pivot_root, new, old);
816}
817
818static __attribute__((unused))
819int pivot_root(const char *new, const char *old)
820{
821 int ret = sys_pivot_root(new, old);
822
823 if (ret < 0) {
824 SET_ERRNO(-ret);
825 ret = -1;
826 }
827 return ret;
828}
829
830
831/*
832 * int poll(struct pollfd *fds, int nfds, int timeout);
833 */
834
835static __attribute__((unused))
836int sys_poll(struct pollfd *fds, int nfds, int timeout)
837{
838#if defined(__NR_ppoll)
839 struct timespec t;
840
841 if (timeout >= 0) {
842 t.tv_sec = timeout / 1000;
843 t.tv_nsec = (timeout % 1000) * 1000000;
844 }
845 return my_syscall4(__NR_ppoll, fds, nfds, (timeout >= 0) ? &t : NULL, NULL);
846#elif defined(__NR_poll)
847 return my_syscall3(__NR_poll, fds, nfds, timeout);
848#else
849#error Neither __NR_ppoll nor __NR_poll defined, cannot implement sys_poll()
850#endif
851}
852
853static __attribute__((unused))
854int poll(struct pollfd *fds, int nfds, int timeout)
855{
856 int ret = sys_poll(fds, nfds, timeout);
857
858 if (ret < 0) {
859 SET_ERRNO(-ret);
860 ret = -1;
861 }
862 return ret;
863}
864
865
866/*
867 * ssize_t read(int fd, void *buf, size_t count);
868 */
869
870static __attribute__((unused))
871ssize_t sys_read(int fd, void *buf, size_t count)
872{
873 return my_syscall3(__NR_read, fd, buf, count);
874}
875
876static __attribute__((unused))
877ssize_t read(int fd, void *buf, size_t count)
878{
879 ssize_t ret = sys_read(fd, buf, count);
880
881 if (ret < 0) {
882 SET_ERRNO(-ret);
883 ret = -1;
884 }
885 return ret;
886}
887
888
889/*
890 * int reboot(int cmd);
891 * <cmd> is among LINUX_REBOOT_CMD_*
892 */
893
894static __attribute__((unused))
895ssize_t sys_reboot(int magic1, int magic2, int cmd, void *arg)
896{
897 return my_syscall4(__NR_reboot, magic1, magic2, cmd, arg);
898}
899
900static __attribute__((unused))
901int reboot(int cmd)
902{
903 int ret = sys_reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, 0);
904
905 if (ret < 0) {
906 SET_ERRNO(-ret);
907 ret = -1;
908 }
909 return ret;
910}
911
912
913/*
914 * int sched_yield(void);
915 */
916
917static __attribute__((unused))
918int sys_sched_yield(void)
919{
920 return my_syscall0(__NR_sched_yield);
921}
922
923static __attribute__((unused))
924int sched_yield(void)
925{
926 int ret = sys_sched_yield();
927
928 if (ret < 0) {
929 SET_ERRNO(-ret);
930 ret = -1;
931 }
932 return ret;
933}
934
935
936/*
937 * int select(int nfds, fd_set *read_fds, fd_set *write_fds,
938 * fd_set *except_fds, struct timeval *timeout);
939 */
940
941static __attribute__((unused))
942int sys_select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout)
943{
944#if defined(__ARCH_WANT_SYS_OLD_SELECT) && !defined(__NR__newselect)
945 struct sel_arg_struct {
946 unsigned long n;
947 fd_set *r, *w, *e;
948 struct timeval *t;
949 } arg = { .n = nfds, .r = rfds, .w = wfds, .e = efds, .t = timeout };
950 return my_syscall1(__NR_select, &arg);
951#elif defined(__ARCH_WANT_SYS_PSELECT6) && defined(__NR_pselect6)
952 struct timespec t;
953
954 if (timeout) {
955 t.tv_sec = timeout->tv_sec;
956 t.tv_nsec = timeout->tv_usec * 1000;
957 }
958 return my_syscall6(__NR_pselect6, nfds, rfds, wfds, efds, timeout ? &t : NULL, NULL);
959#elif defined(__NR__newselect) || defined(__NR_select)
960#ifndef __NR__newselect
961#define __NR__newselect __NR_select
962#endif
963 return my_syscall5(__NR__newselect, nfds, rfds, wfds, efds, timeout);
964#else
965#error None of __NR_select, __NR_pselect6, nor __NR__newselect defined, cannot implement sys_select()
966#endif
967}
968
969static __attribute__((unused))
970int select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout)
971{
972 int ret = sys_select(nfds, rfds, wfds, efds, timeout);
973
974 if (ret < 0) {
975 SET_ERRNO(-ret);
976 ret = -1;
977 }
978 return ret;
979}
980
981
982/*
983 * int setpgid(pid_t pid, pid_t pgid);
984 */
985
986static __attribute__((unused))
987int sys_setpgid(pid_t pid, pid_t pgid)
988{
989 return my_syscall2(__NR_setpgid, pid, pgid);
990}
991
992static __attribute__((unused))
993int setpgid(pid_t pid, pid_t pgid)
994{
995 int ret = sys_setpgid(pid, pgid);
996
997 if (ret < 0) {
998 SET_ERRNO(-ret);
999 ret = -1;
1000 }
1001 return ret;
1002}
1003
1004
1005/*
1006 * pid_t setsid(void);
1007 */
1008
1009static __attribute__((unused))
1010pid_t sys_setsid(void)
1011{
1012 return my_syscall0(__NR_setsid);
1013}
1014
1015static __attribute__((unused))
1016pid_t setsid(void)
1017{
1018 pid_t ret = sys_setsid();
1019
1020 if (ret < 0) {
1021 SET_ERRNO(-ret);
1022 ret = -1;
1023 }
1024 return ret;
1025}
1026
1027
1028/*
1029 * int stat(const char *path, struct stat *buf);
1030 * Warning: the struct stat's layout is arch-dependent.
1031 */
1032
1033static __attribute__((unused))
1034int sys_stat(const char *path, struct stat *buf)
1035{
1036 struct sys_stat_struct stat;
1037 long ret;
1038
1039#ifdef __NR_newfstatat
1040 /* only solution for arm64 */
1041 ret = my_syscall4(__NR_newfstatat, AT_FDCWD, path, &stat, 0);
1042#elif defined(__NR_stat)
1043 ret = my_syscall2(__NR_stat, path, &stat);
1044#else
1045#error Neither __NR_newfstatat nor __NR_stat defined, cannot implement sys_stat()
1046#endif
1047 buf->st_dev = stat.st_dev;
1048 buf->st_ino = stat.st_ino;
1049 buf->st_mode = stat.st_mode;
1050 buf->st_nlink = stat.st_nlink;
1051 buf->st_uid = stat.st_uid;
1052 buf->st_gid = stat.st_gid;
1053 buf->st_rdev = stat.st_rdev;
1054 buf->st_size = stat.st_size;
1055 buf->st_blksize = stat.st_blksize;
1056 buf->st_blocks = stat.st_blocks;
1057 buf->st_atime = stat.st_atime;
1058 buf->st_mtime = stat.st_mtime;
1059 buf->st_ctime = stat.st_ctime;
1060 return ret;
1061}
1062
1063static __attribute__((unused))
1064int stat(const char *path, struct stat *buf)
1065{
1066 int ret = sys_stat(path, buf);
1067
1068 if (ret < 0) {
1069 SET_ERRNO(-ret);
1070 ret = -1;
1071 }
1072 return ret;
1073}
1074
1075
1076/*
1077 * int symlink(const char *old, const char *new);
1078 */
1079
1080static __attribute__((unused))
1081int sys_symlink(const char *old, const char *new)
1082{
1083#ifdef __NR_symlinkat
1084 return my_syscall3(__NR_symlinkat, old, AT_FDCWD, new);
1085#elif defined(__NR_symlink)
1086 return my_syscall2(__NR_symlink, old, new);
1087#else
1088#error Neither __NR_symlinkat nor __NR_symlink defined, cannot implement sys_symlink()
1089#endif
1090}
1091
1092static __attribute__((unused))
1093int symlink(const char *old, const char *new)
1094{
1095 int ret = sys_symlink(old, new);
1096
1097 if (ret < 0) {
1098 SET_ERRNO(-ret);
1099 ret = -1;
1100 }
1101 return ret;
1102}
1103
1104
1105/*
1106 * mode_t umask(mode_t mode);
1107 */
1108
1109static __attribute__((unused))
1110mode_t sys_umask(mode_t mode)
1111{
1112 return my_syscall1(__NR_umask, mode);
1113}
1114
1115static __attribute__((unused))
1116mode_t umask(mode_t mode)
1117{
1118 return sys_umask(mode);
1119}
1120
1121
1122/*
1123 * int umount2(const char *path, int flags);
1124 */
1125
1126static __attribute__((unused))
1127int sys_umount2(const char *path, int flags)
1128{
1129 return my_syscall2(__NR_umount2, path, flags);
1130}
1131
1132static __attribute__((unused))
1133int umount2(const char *path, int flags)
1134{
1135 int ret = sys_umount2(path, flags);
1136
1137 if (ret < 0) {
1138 SET_ERRNO(-ret);
1139 ret = -1;
1140 }
1141 return ret;
1142}
1143
1144
1145/*
1146 * int unlink(const char *path);
1147 */
1148
1149static __attribute__((unused))
1150int sys_unlink(const char *path)
1151{
1152#ifdef __NR_unlinkat
1153 return my_syscall3(__NR_unlinkat, AT_FDCWD, path, 0);
1154#elif defined(__NR_unlink)
1155 return my_syscall1(__NR_unlink, path);
1156#else
1157#error Neither __NR_unlinkat nor __NR_unlink defined, cannot implement sys_unlink()
1158#endif
1159}
1160
1161static __attribute__((unused))
1162int unlink(const char *path)
1163{
1164 int ret = sys_unlink(path);
1165
1166 if (ret < 0) {
1167 SET_ERRNO(-ret);
1168 ret = -1;
1169 }
1170 return ret;
1171}
1172
1173
1174/*
1175 * pid_t wait(int *status);
1176 * pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage);
1177 * pid_t waitpid(pid_t pid, int *status, int options);
1178 */
1179
1180static __attribute__((unused))
1181pid_t sys_wait4(pid_t pid, int *status, int options, struct rusage *rusage)
1182{
1183 return my_syscall4(__NR_wait4, pid, status, options, rusage);
1184}
1185
1186static __attribute__((unused))
1187pid_t wait(int *status)
1188{
1189 pid_t ret = sys_wait4(-1, status, 0, NULL);
1190
1191 if (ret < 0) {
1192 SET_ERRNO(-ret);
1193 ret = -1;
1194 }
1195 return ret;
1196}
1197
1198static __attribute__((unused))
1199pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage)
1200{
1201 pid_t ret = sys_wait4(pid, status, options, rusage);
1202
1203 if (ret < 0) {
1204 SET_ERRNO(-ret);
1205 ret = -1;
1206 }
1207 return ret;
1208}
1209
1210
1211static __attribute__((unused))
1212pid_t waitpid(pid_t pid, int *status, int options)
1213{
1214 pid_t ret = sys_wait4(pid, status, options, NULL);
1215
1216 if (ret < 0) {
1217 SET_ERRNO(-ret);
1218 ret = -1;
1219 }
1220 return ret;
1221}
1222
1223
1224/*
1225 * ssize_t write(int fd, const void *buf, size_t count);
1226 */
1227
1228static __attribute__((unused))
1229ssize_t sys_write(int fd, const void *buf, size_t count)
1230{
1231 return my_syscall3(__NR_write, fd, buf, count);
1232}
1233
1234static __attribute__((unused))
1235ssize_t write(int fd, const void *buf, size_t count)
1236{
1237 ssize_t ret = sys_write(fd, buf, count);
1238
1239 if (ret < 0) {
1240 SET_ERRNO(-ret);
1241 ret = -1;
1242 }
1243 return ret;
1244}
1245
1246/* make sure to include all global symbols */
1247#include "nolibc.h"
1248
1249#endif /* _NOLIBC_SYS_H */
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
52static __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
87static __attribute__((unused))
88void *sys_brk(void *addr)
89{
90 return (void *)my_syscall1(__NR_brk, addr);
91}
92
93static __attribute__((unused))
94int 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
105static __attribute__((unused))
106void *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
123static __attribute__((unused))
124int sys_chdir(const char *path)
125{
126 return my_syscall1(__NR_chdir, path);
127}
128
129static __attribute__((unused))
130int 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
140static __attribute__((unused))
141int 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
152static __attribute__((unused))
153int 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
163static __attribute__((unused))
164int 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
175static __attribute__((unused))
176int 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
186static __attribute__((unused))
187int sys_chroot(const char *path)
188{
189 return my_syscall1(__NR_chroot, path);
190}
191
192static __attribute__((unused))
193int chroot(const char *path)
194{
195 return __sysret(sys_chroot(path));
196}
197
198
199/*
200 * int close(int fd);
201 */
202
203static __attribute__((unused))
204int sys_close(int fd)
205{
206 return my_syscall1(__NR_close, fd);
207}
208
209static __attribute__((unused))
210int close(int fd)
211{
212 return __sysret(sys_close(fd));
213}
214
215
216/*
217 * int dup(int fd);
218 */
219
220static __attribute__((unused))
221int sys_dup(int fd)
222{
223 return my_syscall1(__NR_dup, fd);
224}
225
226static __attribute__((unused))
227int dup(int fd)
228{
229 return __sysret(sys_dup(fd));
230}
231
232
233/*
234 * int dup2(int old, int new);
235 */
236
237static __attribute__((unused))
238int 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
249static __attribute__((unused))
250int 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
261static __attribute__((unused))
262int sys_dup3(int old, int new, int flags)
263{
264 return my_syscall3(__NR_dup3, old, new, flags);
265}
266
267static __attribute__((unused))
268int 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
279static __attribute__((unused))
280int sys_execve(const char *filename, char *const argv[], char *const envp[])
281{
282 return my_syscall3(__NR_execve, filename, argv, envp);
283}
284
285static __attribute__((unused))
286int 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
296static __attribute__((noreturn,unused))
297void sys_exit(int status)
298{
299 my_syscall1(__NR_exit, status & 255);
300 while(1); /* shut the "noreturn" warnings. */
301}
302
303static __attribute__((noreturn,unused))
304void exit(int status)
305{
306 sys_exit(status);
307}
308
309
310/*
311 * pid_t fork(void);
312 */
313
314#ifndef sys_fork
315static __attribute__((unused))
316pid_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
332static __attribute__((unused))
333pid_t fork(void)
334{
335 return __sysret(sys_fork());
336}
337
338
339/*
340 * int fsync(int fd);
341 */
342
343static __attribute__((unused))
344int sys_fsync(int fd)
345{
346 return my_syscall1(__NR_fsync, fd);
347}
348
349static __attribute__((unused))
350int 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
360static __attribute__((unused))
361int sys_getdents64(int fd, struct linux_dirent64 *dirp, int count)
362{
363 return my_syscall3(__NR_getdents64, fd, dirp, count);
364}
365
366static __attribute__((unused))
367int 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
377static __attribute__((unused))
378uid_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
387static __attribute__((unused))
388uid_t geteuid(void)
389{
390 return sys_geteuid();
391}
392
393
394/*
395 * pid_t getpgid(pid_t pid);
396 */
397
398static __attribute__((unused))
399pid_t sys_getpgid(pid_t pid)
400{
401 return my_syscall1(__NR_getpgid, pid);
402}
403
404static __attribute__((unused))
405pid_t getpgid(pid_t pid)
406{
407 return __sysret(sys_getpgid(pid));
408}
409
410
411/*
412 * pid_t getpgrp(void);
413 */
414
415static __attribute__((unused))
416pid_t sys_getpgrp(void)
417{
418 return sys_getpgid(0);
419}
420
421static __attribute__((unused))
422pid_t getpgrp(void)
423{
424 return sys_getpgrp();
425}
426
427
428/*
429 * pid_t getpid(void);
430 */
431
432static __attribute__((unused))
433pid_t sys_getpid(void)
434{
435 return my_syscall0(__NR_getpid);
436}
437
438static __attribute__((unused))
439pid_t getpid(void)
440{
441 return sys_getpid();
442}
443
444
445/*
446 * pid_t getppid(void);
447 */
448
449static __attribute__((unused))
450pid_t sys_getppid(void)
451{
452 return my_syscall0(__NR_getppid);
453}
454
455static __attribute__((unused))
456pid_t getppid(void)
457{
458 return sys_getppid();
459}
460
461
462/*
463 * pid_t gettid(void);
464 */
465
466static __attribute__((unused))
467pid_t sys_gettid(void)
468{
469 return my_syscall0(__NR_gettid);
470}
471
472static __attribute__((unused))
473pid_t gettid(void)
474{
475 return sys_gettid();
476}
477
478static unsigned long getauxval(unsigned long key);
479
480/*
481 * int getpagesize(void);
482 */
483
484static __attribute__((unused))
485int 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
495static __attribute__((unused))
496int 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
505static __attribute__((unused))
506int 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
516static __attribute__((unused))
517uid_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
526static __attribute__((unused))
527uid_t getuid(void)
528{
529 return sys_getuid();
530}
531
532
533/*
534 * int ioctl(int fd, unsigned long req, void *value);
535 */
536
537static __attribute__((unused))
538int sys_ioctl(int fd, unsigned long req, void *value)
539{
540 return my_syscall3(__NR_ioctl, fd, req, value);
541}
542
543static __attribute__((unused))
544int 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
553static __attribute__((unused))
554int sys_kill(pid_t pid, int signal)
555{
556 return my_syscall2(__NR_kill, pid, signal);
557}
558
559static __attribute__((unused))
560int 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
570static __attribute__((unused))
571int 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
582static __attribute__((unused))
583int 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
593static __attribute__((unused))
594off_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
603static __attribute__((unused))
604off_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
614static __attribute__((unused))
615int 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
626static __attribute__((unused))
627int 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
636static __attribute__((unused))
637int 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
648static __attribute__((unused))
649int 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
659static __attribute__((unused))
660long 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
671static __attribute__((unused))
672int 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
678static __attribute__((unused))
679void *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
700static __attribute__((unused))
701void *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
712static __attribute__((unused))
713int sys_munmap(void *addr, size_t length)
714{
715 return my_syscall2(__NR_munmap, addr, length);
716}
717
718static __attribute__((unused))
719int 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 */
729static __attribute__((unused))
730int 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
736static __attribute__((unused))
737int 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
749static __attribute__((unused))
750int 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
761static __attribute__((unused))
762int 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
783static __attribute__((unused))
784int sys_pipe2(int pipefd[2], int flags)
785{
786 return my_syscall2(__NR_pipe2, pipefd, flags);
787}
788
789static __attribute__((unused))
790int pipe2(int pipefd[2], int flags)
791{
792 return __sysret(sys_pipe2(pipefd, flags));
793}
794
795static __attribute__((unused))
796int 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
807static __attribute__((unused))
808int 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
814static __attribute__((unused))
815int 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
826static __attribute__((unused))
827int sys_pivot_root(const char *new, const char *old)
828{
829 return my_syscall2(__NR_pivot_root, new, old);
830}
831
832static __attribute__((unused))
833int 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
843static __attribute__((unused))
844int 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
861static __attribute__((unused))
862int 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
872static __attribute__((unused))
873ssize_t sys_read(int fd, void *buf, size_t count)
874{
875 return my_syscall3(__NR_read, fd, buf, count);
876}
877
878static __attribute__((unused))
879ssize_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
890static __attribute__((unused))
891ssize_t sys_reboot(int magic1, int magic2, int cmd, void *arg)
892{
893 return my_syscall4(__NR_reboot, magic1, magic2, cmd, arg);
894}
895
896static __attribute__((unused))
897int 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
908static __attribute__((unused))
909int 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
915static __attribute__((unused))
916int 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
928static __attribute__((unused))
929int 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
944static __attribute__((unused))
945int sys_sched_yield(void)
946{
947 return my_syscall0(__NR_sched_yield);
948}
949
950static __attribute__((unused))
951int 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
962static __attribute__((unused))
963int 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
989static __attribute__((unused))
990int 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
1000static __attribute__((unused))
1001int sys_setpgid(pid_t pid, pid_t pgid)
1002{
1003 return my_syscall2(__NR_setpgid, pid, pgid);
1004}
1005
1006static __attribute__((unused))
1007int 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
1017static __attribute__((unused))
1018pid_t sys_setsid(void)
1019{
1020 return my_syscall0(__NR_setsid);
1021}
1022
1023static __attribute__((unused))
1024pid_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
1034static __attribute__((unused))
1035int 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
1044static __attribute__((unused))
1045int 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
1051static __attribute__((unused))
1052int 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
1090static __attribute__((unused))
1091int 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
1102static __attribute__((unused))
1103int 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
1113static __attribute__((unused))
1114mode_t sys_umask(mode_t mode)
1115{
1116 return my_syscall1(__NR_umask, mode);
1117}
1118
1119static __attribute__((unused))
1120mode_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
1130static __attribute__((unused))
1131int sys_umount2(const char *path, int flags)
1132{
1133 return my_syscall2(__NR_umount2, path, flags);
1134}
1135
1136static __attribute__((unused))
1137int 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
1147struct 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
1156static __attribute__((unused))
1157int sys_uname(struct utsname *buf)
1158{
1159 return my_syscall1(__NR_uname, buf);
1160}
1161
1162static __attribute__((unused))
1163int uname(struct utsname *buf)
1164{
1165 return __sysret(sys_uname(buf));
1166}
1167
1168
1169/*
1170 * int unlink(const char *path);
1171 */
1172
1173static __attribute__((unused))
1174int 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
1185static __attribute__((unused))
1186int 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
1198static __attribute__((unused))
1199pid_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
1208static __attribute__((unused))
1209pid_t wait(int *status)
1210{
1211 return __sysret(sys_wait4(-1, status, 0, NULL));
1212}
1213
1214static __attribute__((unused))
1215pid_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
1221static __attribute__((unused))
1222pid_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
1232static __attribute__((unused))
1233ssize_t sys_write(int fd, const void *buf, size_t count)
1234{
1235 return my_syscall3(__NR_write, fd, buf, count);
1236}
1237
1238static __attribute__((unused))
1239ssize_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
1249static __attribute__((unused))
1250int sys_memfd_create(const char *name, unsigned int flags)
1251{
1252 return my_syscall2(__NR_memfd_create, name, flags);
1253}
1254
1255static __attribute__((unused))
1256int 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 */