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
55 static __attribute__((unused))
sys_brk(void * addr)56 void *sys_brk(void *addr)
57 {
58 return (void *)my_syscall1(__NR_brk, addr);
59 }
60
61 static __attribute__((unused))
brk(void * addr)62 int 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
73 static __attribute__((unused))
sbrk(intptr_t inc)74 void *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
91 static __attribute__((unused))
sys_chdir(const char * path)92 int sys_chdir(const char *path)
93 {
94 return my_syscall1(__NR_chdir, path);
95 }
96
97 static __attribute__((unused))
chdir(const char * path)98 int 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
114 static __attribute__((unused))
sys_chmod(const char * path,mode_t mode)115 int 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
126 static __attribute__((unused))
chmod(const char * path,mode_t mode)127 int 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
143 static __attribute__((unused))
sys_chown(const char * path,uid_t owner,gid_t group)144 int 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
155 static __attribute__((unused))
chown(const char * path,uid_t owner,gid_t group)156 int 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
172 static __attribute__((unused))
sys_chroot(const char * path)173 int sys_chroot(const char *path)
174 {
175 return my_syscall1(__NR_chroot, path);
176 }
177
178 static __attribute__((unused))
chroot(const char * path)179 int 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
195 static __attribute__((unused))
sys_close(int fd)196 int sys_close(int fd)
197 {
198 return my_syscall1(__NR_close, fd);
199 }
200
201 static __attribute__((unused))
close(int fd)202 int 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
218 static __attribute__((unused))
sys_dup(int fd)219 int sys_dup(int fd)
220 {
221 return my_syscall1(__NR_dup, fd);
222 }
223
224 static __attribute__((unused))
dup(int fd)225 int 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
241 static __attribute__((unused))
sys_dup2(int old,int new)242 int 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
253 static __attribute__((unused))
dup2(int old,int new)254 int 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
271 static __attribute__((unused))
sys_dup3(int old,int new,int flags)272 int sys_dup3(int old, int new, int flags)
273 {
274 return my_syscall3(__NR_dup3, old, new, flags);
275 }
276
277 static __attribute__((unused))
dup3(int old,int new,int flags)278 int 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
295 static __attribute__((unused))
sys_execve(const char * filename,char * const argv[],char * const envp[])296 int sys_execve(const char *filename, char *const argv[], char *const envp[])
297 {
298 return my_syscall3(__NR_execve, filename, argv, envp);
299 }
300
301 static __attribute__((unused))
execve(const char * filename,char * const argv[],char * const envp[])302 int 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
318 static __attribute__((noreturn,unused))
sys_exit(int status)319 void sys_exit(int status)
320 {
321 my_syscall1(__NR_exit, status & 255);
322 while(1); // shut the "noreturn" warnings.
323 }
324
325 static __attribute__((noreturn,unused))
exit(int status)326 void exit(int status)
327 {
328 sys_exit(status);
329 }
330
331
332 /*
333 * pid_t fork(void);
334 */
335
336 static __attribute__((unused))
sys_fork(void)337 pid_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
352 static __attribute__((unused))
fork(void)353 pid_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
369 static __attribute__((unused))
sys_fsync(int fd)370 int sys_fsync(int fd)
371 {
372 return my_syscall1(__NR_fsync, fd);
373 }
374
375 static __attribute__((unused))
fsync(int fd)376 int 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
392 static __attribute__((unused))
sys_getdents64(int fd,struct linux_dirent64 * dirp,int count)393 int sys_getdents64(int fd, struct linux_dirent64 *dirp, int count)
394 {
395 return my_syscall3(__NR_getdents64, fd, dirp, count);
396 }
397
398 static __attribute__((unused))
getdents64(int fd,struct linux_dirent64 * dirp,int count)399 int 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
415 static __attribute__((unused))
sys_getpgid(pid_t pid)416 pid_t sys_getpgid(pid_t pid)
417 {
418 return my_syscall1(__NR_getpgid, pid);
419 }
420
421 static __attribute__((unused))
getpgid(pid_t pid)422 pid_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
438 static __attribute__((unused))
sys_getpgrp(void)439 pid_t sys_getpgrp(void)
440 {
441 return sys_getpgid(0);
442 }
443
444 static __attribute__((unused))
getpgrp(void)445 pid_t getpgrp(void)
446 {
447 return sys_getpgrp();
448 }
449
450
451 /*
452 * pid_t getpid(void);
453 */
454
455 static __attribute__((unused))
sys_getpid(void)456 pid_t sys_getpid(void)
457 {
458 return my_syscall0(__NR_getpid);
459 }
460
461 static __attribute__((unused))
getpid(void)462 pid_t getpid(void)
463 {
464 return sys_getpid();
465 }
466
467
468 /*
469 * pid_t getppid(void);
470 */
471
472 static __attribute__((unused))
sys_getppid(void)473 pid_t sys_getppid(void)
474 {
475 return my_syscall0(__NR_getppid);
476 }
477
478 static __attribute__((unused))
getppid(void)479 pid_t getppid(void)
480 {
481 return sys_getppid();
482 }
483
484
485 /*
486 * pid_t gettid(void);
487 */
488
489 static __attribute__((unused))
sys_gettid(void)490 pid_t sys_gettid(void)
491 {
492 return my_syscall0(__NR_gettid);
493 }
494
495 static __attribute__((unused))
gettid(void)496 pid_t gettid(void)
497 {
498 return sys_gettid();
499 }
500
501
502 /*
503 * int gettimeofday(struct timeval *tv, struct timezone *tz);
504 */
505
506 static __attribute__((unused))
sys_gettimeofday(struct timeval * tv,struct timezone * tz)507 int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
508 {
509 return my_syscall2(__NR_gettimeofday, tv, tz);
510 }
511
512 static __attribute__((unused))
gettimeofday(struct timeval * tv,struct timezone * tz)513 int 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
529 static __attribute__((unused))
sys_ioctl(int fd,unsigned long req,void * value)530 int sys_ioctl(int fd, unsigned long req, void *value)
531 {
532 return my_syscall3(__NR_ioctl, fd, req, value);
533 }
534
535 static __attribute__((unused))
ioctl(int fd,unsigned long req,void * value)536 int 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
551 static __attribute__((unused))
sys_kill(pid_t pid,int signal)552 int sys_kill(pid_t pid, int signal)
553 {
554 return my_syscall2(__NR_kill, pid, signal);
555 }
556
557 static __attribute__((unused))
kill(pid_t pid,int signal)558 int 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
574 static __attribute__((unused))
sys_link(const char * old,const char * new)575 int 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
586 static __attribute__((unused))
link(const char * old,const char * new)587 int 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
603 static __attribute__((unused))
sys_lseek(int fd,off_t offset,int whence)604 off_t sys_lseek(int fd, off_t offset, int whence)
605 {
606 return my_syscall3(__NR_lseek, fd, offset, whence);
607 }
608
609 static __attribute__((unused))
lseek(int fd,off_t offset,int whence)610 off_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
626 static __attribute__((unused))
sys_mkdir(const char * path,mode_t mode)627 int 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
638 static __attribute__((unused))
mkdir(const char * path,mode_t mode)639 int 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
655 static __attribute__((unused))
sys_mknod(const char * path,mode_t mode,dev_t dev)656 long 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
667 static __attribute__((unused))
mknod(const char * path,mode_t mode,dev_t dev)668 int 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
689 static __attribute__((unused))
sys_mmap(void * addr,size_t length,int prot,int flags,int fd,off_t offset)690 void *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
711 static __attribute__((unused))
mmap(void * addr,size_t length,int prot,int flags,int fd,off_t offset)712 void *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
723 static __attribute__((unused))
sys_munmap(void * addr,size_t length)724 int sys_munmap(void *addr, size_t length)
725 {
726 return my_syscall2(__NR_munmap, addr, length);
727 }
728
729 static __attribute__((unused))
munmap(void * addr,size_t length)730 int 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 */
746 static __attribute__((unused))
sys_mount(const char * src,const char * tgt,const char * fst,unsigned long flags,const void * data)747 int 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
753 static __attribute__((unused))
mount(const char * src,const char * tgt,const char * fst,unsigned long flags,const void * data)754 int 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
772 static __attribute__((unused))
sys_open(const char * path,int flags,mode_t mode)773 int 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
784 static __attribute__((unused))
open(const char * path,int flags,...)785 int 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
812 static __attribute__((unused))
sys_pivot_root(const char * new,const char * old)813 int sys_pivot_root(const char *new, const char *old)
814 {
815 return my_syscall2(__NR_pivot_root, new, old);
816 }
817
818 static __attribute__((unused))
pivot_root(const char * new,const char * old)819 int 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
835 static __attribute__((unused))
sys_poll(struct pollfd * fds,int nfds,int timeout)836 int 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
853 static __attribute__((unused))
poll(struct pollfd * fds,int nfds,int timeout)854 int 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
870 static __attribute__((unused))
sys_read(int fd,void * buf,size_t count)871 ssize_t sys_read(int fd, void *buf, size_t count)
872 {
873 return my_syscall3(__NR_read, fd, buf, count);
874 }
875
876 static __attribute__((unused))
read(int fd,void * buf,size_t count)877 ssize_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
894 static __attribute__((unused))
sys_reboot(int magic1,int magic2,int cmd,void * arg)895 ssize_t sys_reboot(int magic1, int magic2, int cmd, void *arg)
896 {
897 return my_syscall4(__NR_reboot, magic1, magic2, cmd, arg);
898 }
899
900 static __attribute__((unused))
reboot(int cmd)901 int 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
917 static __attribute__((unused))
sys_sched_yield(void)918 int sys_sched_yield(void)
919 {
920 return my_syscall0(__NR_sched_yield);
921 }
922
923 static __attribute__((unused))
sched_yield(void)924 int 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
941 static __attribute__((unused))
sys_select(int nfds,fd_set * rfds,fd_set * wfds,fd_set * efds,struct timeval * timeout)942 int 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
969 static __attribute__((unused))
select(int nfds,fd_set * rfds,fd_set * wfds,fd_set * efds,struct timeval * timeout)970 int 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
986 static __attribute__((unused))
sys_setpgid(pid_t pid,pid_t pgid)987 int sys_setpgid(pid_t pid, pid_t pgid)
988 {
989 return my_syscall2(__NR_setpgid, pid, pgid);
990 }
991
992 static __attribute__((unused))
setpgid(pid_t pid,pid_t pgid)993 int 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
1009 static __attribute__((unused))
sys_setsid(void)1010 pid_t sys_setsid(void)
1011 {
1012 return my_syscall0(__NR_setsid);
1013 }
1014
1015 static __attribute__((unused))
setsid(void)1016 pid_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
1033 static __attribute__((unused))
sys_stat(const char * path,struct stat * buf)1034 int 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
1063 static __attribute__((unused))
stat(const char * path,struct stat * buf)1064 int 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
1080 static __attribute__((unused))
sys_symlink(const char * old,const char * new)1081 int 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
1092 static __attribute__((unused))
symlink(const char * old,const char * new)1093 int 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
1109 static __attribute__((unused))
sys_umask(mode_t mode)1110 mode_t sys_umask(mode_t mode)
1111 {
1112 return my_syscall1(__NR_umask, mode);
1113 }
1114
1115 static __attribute__((unused))
umask(mode_t mode)1116 mode_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
1126 static __attribute__((unused))
sys_umount2(const char * path,int flags)1127 int sys_umount2(const char *path, int flags)
1128 {
1129 return my_syscall2(__NR_umount2, path, flags);
1130 }
1131
1132 static __attribute__((unused))
umount2(const char * path,int flags)1133 int 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
1149 static __attribute__((unused))
sys_unlink(const char * path)1150 int 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
1161 static __attribute__((unused))
unlink(const char * path)1162 int 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
1180 static __attribute__((unused))
sys_wait4(pid_t pid,int * status,int options,struct rusage * rusage)1181 pid_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
1186 static __attribute__((unused))
wait(int * status)1187 pid_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
1198 static __attribute__((unused))
wait4(pid_t pid,int * status,int options,struct rusage * rusage)1199 pid_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
1211 static __attribute__((unused))
waitpid(pid_t pid,int * status,int options)1212 pid_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
1228 static __attribute__((unused))
sys_write(int fd,const void * buf,size_t count)1229 ssize_t sys_write(int fd, const void *buf, size_t count)
1230 {
1231 return my_syscall3(__NR_write, fd, buf, count);
1232 }
1233
1234 static __attribute__((unused))
write(int fd,const void * buf,size_t count)1235 ssize_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
1247 #endif /* _NOLIBC_SYS_H */
1248
