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 #include <linux/auxvec.h> 22 #include <linux/fcntl.h> /* for O_* and AT_* */ 23 #include <linux/stat.h> /* for statx() */ 24 #include <linux/prctl.h> 25 26 #include "arch.h" 27 #include "errno.h" 28 #include "types.h" 29 30 31 /* Syscall return helper for library routines, set errno as -ret when ret is in 32 * range of [-MAX_ERRNO, -1] 33 * 34 * Note, No official reference states the errno range here aligns with musl 35 * (src/internal/syscall_ret.c) and glibc (sysdeps/unix/sysv/linux/sysdep.h) 36 */ 37 38 static __inline__ __attribute__((unused, always_inline)) 39 long __sysret(unsigned long ret) 40 { 41 if (ret >= (unsigned long)-MAX_ERRNO) { 42 SET_ERRNO(-(long)ret); 43 return -1; 44 } 45 return ret; 46 } 47 48 /* Functions in this file only describe syscalls. They're declared static so 49 * that the compiler usually decides to inline them while still being allowed 50 * to pass a pointer to one of their instances. Each syscall exists in two 51 * versions: 52 * - the "internal" ones, which matches the raw syscall interface at the 53 * kernel level, which may sometimes slightly differ from the documented 54 * libc-level ones. For example most of them return either a valid value 55 * or -errno. All of these are prefixed with "sys_". They may be called 56 * by non-portable applications if desired. 57 * 58 * - the "exported" ones, whose interface must closely match the one 59 * documented in man(2), that applications are supposed to expect. These 60 * ones rely on the internal ones, and set errno. 61 * 62 * Each syscall will be defined with the two functions, sorted in alphabetical 63 * order applied to the exported names. 64 * 65 * In case of doubt about the relevance of a function here, only those which 66 * set errno should be defined here. Wrappers like those appearing in man(3) 67 * should not be placed here. 68 */ 69 70 71 /* 72 * int brk(void *addr); 73 * void *sbrk(intptr_t inc) 74 */ 75 76 static __attribute__((unused)) 77 void *sys_brk(void *addr) 78 { 79 return (void *)my_syscall1(__NR_brk, addr); 80 } 81 82 static __attribute__((unused)) 83 int brk(void *addr) 84 { 85 return __sysret(sys_brk(addr) ? 0 : -ENOMEM); 86 } 87 88 static __attribute__((unused)) 89 void *sbrk(intptr_t inc) 90 { 91 /* first call to find current end */ 92 void *ret = sys_brk(0); 93 94 if (ret && sys_brk(ret + inc) == ret + inc) 95 return ret + inc; 96 97 return (void *)__sysret(-ENOMEM); 98 } 99 100 101 /* 102 * int chdir(const char *path); 103 */ 104 105 static __attribute__((unused)) 106 int sys_chdir(const char *path) 107 { 108 return my_syscall1(__NR_chdir, path); 109 } 110 111 static __attribute__((unused)) 112 int chdir(const char *path) 113 { 114 return __sysret(sys_chdir(path)); 115 } 116 117 118 /* 119 * int chmod(const char *path, mode_t mode); 120 */ 121 122 static __attribute__((unused)) 123 int sys_chmod(const char *path, mode_t mode) 124 { 125 #ifdef __NR_fchmodat 126 return my_syscall4(__NR_fchmodat, AT_FDCWD, path, mode, 0); 127 #elif defined(__NR_chmod) 128 return my_syscall2(__NR_chmod, path, mode); 129 #else 130 return -ENOSYS; 131 #endif 132 } 133 134 static __attribute__((unused)) 135 int chmod(const char *path, mode_t mode) 136 { 137 return __sysret(sys_chmod(path, mode)); 138 } 139 140 141 /* 142 * int chown(const char *path, uid_t owner, gid_t group); 143 */ 144 145 static __attribute__((unused)) 146 int sys_chown(const char *path, uid_t owner, gid_t group) 147 { 148 #ifdef __NR_fchownat 149 return my_syscall5(__NR_fchownat, AT_FDCWD, path, owner, group, 0); 150 #elif defined(__NR_chown) 151 return my_syscall3(__NR_chown, path, owner, group); 152 #else 153 return -ENOSYS; 154 #endif 155 } 156 157 static __attribute__((unused)) 158 int chown(const char *path, uid_t owner, gid_t group) 159 { 160 return __sysret(sys_chown(path, owner, group)); 161 } 162 163 164 /* 165 * int chroot(const char *path); 166 */ 167 168 static __attribute__((unused)) 169 int sys_chroot(const char *path) 170 { 171 return my_syscall1(__NR_chroot, path); 172 } 173 174 static __attribute__((unused)) 175 int chroot(const char *path) 176 { 177 return __sysret(sys_chroot(path)); 178 } 179 180 181 /* 182 * int close(int fd); 183 */ 184 185 static __attribute__((unused)) 186 int sys_close(int fd) 187 { 188 return my_syscall1(__NR_close, fd); 189 } 190 191 static __attribute__((unused)) 192 int close(int fd) 193 { 194 return __sysret(sys_close(fd)); 195 } 196 197 198 /* 199 * int dup(int fd); 200 */ 201 202 static __attribute__((unused)) 203 int sys_dup(int fd) 204 { 205 return my_syscall1(__NR_dup, fd); 206 } 207 208 static __attribute__((unused)) 209 int dup(int fd) 210 { 211 return __sysret(sys_dup(fd)); 212 } 213 214 215 /* 216 * int dup2(int old, int new); 217 */ 218 219 static __attribute__((unused)) 220 int sys_dup2(int old, int new) 221 { 222 #ifdef __NR_dup3 223 return my_syscall3(__NR_dup3, old, new, 0); 224 #elif defined(__NR_dup2) 225 return my_syscall2(__NR_dup2, old, new); 226 #else 227 return -ENOSYS; 228 #endif 229 } 230 231 static __attribute__((unused)) 232 int dup2(int old, int new) 233 { 234 return __sysret(sys_dup2(old, new)); 235 } 236 237 238 /* 239 * int dup3(int old, int new, int flags); 240 */ 241 242 #ifdef __NR_dup3 243 static __attribute__((unused)) 244 int sys_dup3(int old, int new, int flags) 245 { 246 return my_syscall3(__NR_dup3, old, new, flags); 247 } 248 249 static __attribute__((unused)) 250 int dup3(int old, int new, int flags) 251 { 252 return __sysret(sys_dup3(old, new, flags)); 253 } 254 #endif 255 256 257 /* 258 * int execve(const char *filename, char *const argv[], char *const envp[]); 259 */ 260 261 static __attribute__((unused)) 262 int sys_execve(const char *filename, char *const argv[], char *const envp[]) 263 { 264 return my_syscall3(__NR_execve, filename, argv, envp); 265 } 266 267 static __attribute__((unused)) 268 int execve(const char *filename, char *const argv[], char *const envp[]) 269 { 270 return __sysret(sys_execve(filename, argv, envp)); 271 } 272 273 274 /* 275 * void exit(int status); 276 */ 277 278 static __attribute__((noreturn,unused)) 279 void sys_exit(int status) 280 { 281 my_syscall1(__NR_exit, status & 255); 282 while(1); /* shut the "noreturn" warnings. */ 283 } 284 285 static __attribute__((noreturn,unused)) 286 void exit(int status) 287 { 288 sys_exit(status); 289 } 290 291 292 /* 293 * pid_t fork(void); 294 */ 295 296 #ifndef sys_fork 297 static __attribute__((unused)) 298 pid_t sys_fork(void) 299 { 300 #ifdef __NR_clone 301 /* note: some archs only have clone() and not fork(). Different archs 302 * have a different API, but most archs have the flags on first arg and 303 * will not use the rest with no other flag. 304 */ 305 return my_syscall5(__NR_clone, SIGCHLD, 0, 0, 0, 0); 306 #elif defined(__NR_fork) 307 return my_syscall0(__NR_fork); 308 #else 309 return -ENOSYS; 310 #endif 311 } 312 #endif 313 314 static __attribute__((unused)) 315 pid_t fork(void) 316 { 317 return __sysret(sys_fork()); 318 } 319 320 321 /* 322 * int fsync(int fd); 323 */ 324 325 static __attribute__((unused)) 326 int sys_fsync(int fd) 327 { 328 return my_syscall1(__NR_fsync, fd); 329 } 330 331 static __attribute__((unused)) 332 int fsync(int fd) 333 { 334 return __sysret(sys_fsync(fd)); 335 } 336 337 338 /* 339 * int getdents64(int fd, struct linux_dirent64 *dirp, int count); 340 */ 341 342 static __attribute__((unused)) 343 int sys_getdents64(int fd, struct linux_dirent64 *dirp, int count) 344 { 345 return my_syscall3(__NR_getdents64, fd, dirp, count); 346 } 347 348 static __attribute__((unused)) 349 int getdents64(int fd, struct linux_dirent64 *dirp, int count) 350 { 351 return __sysret(sys_getdents64(fd, dirp, count)); 352 } 353 354 355 /* 356 * uid_t geteuid(void); 357 */ 358 359 static __attribute__((unused)) 360 uid_t sys_geteuid(void) 361 { 362 #ifdef __NR_geteuid32 363 return my_syscall0(__NR_geteuid32); 364 #else 365 return my_syscall0(__NR_geteuid); 366 #endif 367 } 368 369 static __attribute__((unused)) 370 uid_t geteuid(void) 371 { 372 return sys_geteuid(); 373 } 374 375 376 /* 377 * pid_t getpgid(pid_t pid); 378 */ 379 380 static __attribute__((unused)) 381 pid_t sys_getpgid(pid_t pid) 382 { 383 return my_syscall1(__NR_getpgid, pid); 384 } 385 386 static __attribute__((unused)) 387 pid_t getpgid(pid_t pid) 388 { 389 return __sysret(sys_getpgid(pid)); 390 } 391 392 393 /* 394 * pid_t getpgrp(void); 395 */ 396 397 static __attribute__((unused)) 398 pid_t sys_getpgrp(void) 399 { 400 return sys_getpgid(0); 401 } 402 403 static __attribute__((unused)) 404 pid_t getpgrp(void) 405 { 406 return sys_getpgrp(); 407 } 408 409 410 /* 411 * pid_t getpid(void); 412 */ 413 414 static __attribute__((unused)) 415 pid_t sys_getpid(void) 416 { 417 return my_syscall0(__NR_getpid); 418 } 419 420 static __attribute__((unused)) 421 pid_t getpid(void) 422 { 423 return sys_getpid(); 424 } 425 426 427 /* 428 * pid_t getppid(void); 429 */ 430 431 static __attribute__((unused)) 432 pid_t sys_getppid(void) 433 { 434 return my_syscall0(__NR_getppid); 435 } 436 437 static __attribute__((unused)) 438 pid_t getppid(void) 439 { 440 return sys_getppid(); 441 } 442 443 444 /* 445 * pid_t gettid(void); 446 */ 447 448 static __attribute__((unused)) 449 pid_t sys_gettid(void) 450 { 451 return my_syscall0(__NR_gettid); 452 } 453 454 static __attribute__((unused)) 455 pid_t gettid(void) 456 { 457 return sys_gettid(); 458 } 459 460 static unsigned long getauxval(unsigned long key); 461 462 /* 463 * long getpagesize(void); 464 */ 465 466 static __attribute__((unused)) 467 long getpagesize(void) 468 { 469 return __sysret(getauxval(AT_PAGESZ) ?: -ENOENT); 470 } 471 472 473 /* 474 * int gettimeofday(struct timeval *tv, struct timezone *tz); 475 */ 476 477 static __attribute__((unused)) 478 int sys_gettimeofday(struct timeval *tv, struct timezone *tz) 479 { 480 #ifdef __NR_gettimeofday 481 return my_syscall2(__NR_gettimeofday, tv, tz); 482 #else 483 return -ENOSYS; 484 #endif 485 } 486 487 static __attribute__((unused)) 488 int gettimeofday(struct timeval *tv, struct timezone *tz) 489 { 490 return __sysret(sys_gettimeofday(tv, tz)); 491 } 492 493 494 /* 495 * uid_t getuid(void); 496 */ 497 498 static __attribute__((unused)) 499 uid_t sys_getuid(void) 500 { 501 #ifdef __NR_getuid32 502 return my_syscall0(__NR_getuid32); 503 #else 504 return my_syscall0(__NR_getuid); 505 #endif 506 } 507 508 static __attribute__((unused)) 509 uid_t getuid(void) 510 { 511 return sys_getuid(); 512 } 513 514 515 /* 516 * int ioctl(int fd, unsigned long req, void *value); 517 */ 518 519 static __attribute__((unused)) 520 int sys_ioctl(int fd, unsigned long req, void *value) 521 { 522 return my_syscall3(__NR_ioctl, fd, req, value); 523 } 524 525 static __attribute__((unused)) 526 int ioctl(int fd, unsigned long req, void *value) 527 { 528 return __sysret(sys_ioctl(fd, req, value)); 529 } 530 531 /* 532 * int kill(pid_t pid, int signal); 533 */ 534 535 static __attribute__((unused)) 536 int sys_kill(pid_t pid, int signal) 537 { 538 return my_syscall2(__NR_kill, pid, signal); 539 } 540 541 static __attribute__((unused)) 542 int kill(pid_t pid, int signal) 543 { 544 return __sysret(sys_kill(pid, signal)); 545 } 546 547 548 /* 549 * int link(const char *old, const char *new); 550 */ 551 552 static __attribute__((unused)) 553 int sys_link(const char *old, const char *new) 554 { 555 #ifdef __NR_linkat 556 return my_syscall5(__NR_linkat, AT_FDCWD, old, AT_FDCWD, new, 0); 557 #elif defined(__NR_link) 558 return my_syscall2(__NR_link, old, new); 559 #else 560 return -ENOSYS; 561 #endif 562 } 563 564 static __attribute__((unused)) 565 int link(const char *old, const char *new) 566 { 567 return __sysret(sys_link(old, new)); 568 } 569 570 571 /* 572 * off_t lseek(int fd, off_t offset, int whence); 573 */ 574 575 static __attribute__((unused)) 576 off_t sys_lseek(int fd, off_t offset, int whence) 577 { 578 #ifdef __NR_lseek 579 return my_syscall3(__NR_lseek, fd, offset, whence); 580 #else 581 return -ENOSYS; 582 #endif 583 } 584 585 static __attribute__((unused)) 586 off_t lseek(int fd, off_t offset, int whence) 587 { 588 return __sysret(sys_lseek(fd, offset, whence)); 589 } 590 591 592 /* 593 * int mkdir(const char *path, mode_t mode); 594 */ 595 596 static __attribute__((unused)) 597 int sys_mkdir(const char *path, mode_t mode) 598 { 599 #ifdef __NR_mkdirat 600 return my_syscall3(__NR_mkdirat, AT_FDCWD, path, mode); 601 #elif defined(__NR_mkdir) 602 return my_syscall2(__NR_mkdir, path, mode); 603 #else 604 return -ENOSYS; 605 #endif 606 } 607 608 static __attribute__((unused)) 609 int mkdir(const char *path, mode_t mode) 610 { 611 return __sysret(sys_mkdir(path, mode)); 612 } 613 614 /* 615 * int rmdir(const char *path); 616 */ 617 618 static __attribute__((unused)) 619 int sys_rmdir(const char *path) 620 { 621 #ifdef __NR_rmdir 622 return my_syscall1(__NR_rmdir, path); 623 #elif defined(__NR_unlinkat) 624 return my_syscall3(__NR_unlinkat, AT_FDCWD, path, AT_REMOVEDIR); 625 #else 626 return -ENOSYS; 627 #endif 628 } 629 630 static __attribute__((unused)) 631 int rmdir(const char *path) 632 { 633 return __sysret(sys_rmdir(path)); 634 } 635 636 637 /* 638 * int mknod(const char *path, mode_t mode, dev_t dev); 639 */ 640 641 static __attribute__((unused)) 642 long sys_mknod(const char *path, mode_t mode, dev_t dev) 643 { 644 #ifdef __NR_mknodat 645 return my_syscall4(__NR_mknodat, AT_FDCWD, path, mode, dev); 646 #elif defined(__NR_mknod) 647 return my_syscall3(__NR_mknod, path, mode, dev); 648 #else 649 return -ENOSYS; 650 #endif 651 } 652 653 static __attribute__((unused)) 654 int mknod(const char *path, mode_t mode, dev_t dev) 655 { 656 return __sysret(sys_mknod(path, mode, dev)); 657 } 658 659 #ifndef sys_mmap 660 static __attribute__((unused)) 661 void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd, 662 off_t offset) 663 { 664 int n; 665 666 #if defined(__NR_mmap2) 667 n = __NR_mmap2; 668 offset >>= 12; 669 #else 670 n = __NR_mmap; 671 #endif 672 673 return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset); 674 } 675 #endif 676 677 /* Note that on Linux, MAP_FAILED is -1 so we can use the generic __sysret() 678 * which returns -1 upon error and still satisfy user land that checks for 679 * MAP_FAILED. 680 */ 681 682 static __attribute__((unused)) 683 void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) 684 { 685 return (void *)__sysret((unsigned long)sys_mmap(addr, length, prot, flags, fd, offset)); 686 } 687 688 static __attribute__((unused)) 689 int sys_munmap(void *addr, size_t length) 690 { 691 return my_syscall2(__NR_munmap, addr, length); 692 } 693 694 static __attribute__((unused)) 695 int munmap(void *addr, size_t length) 696 { 697 return __sysret(sys_munmap(addr, length)); 698 } 699 700 /* 701 * int mount(const char *source, const char *target, 702 * const char *fstype, unsigned long flags, 703 * const void *data); 704 */ 705 static __attribute__((unused)) 706 int sys_mount(const char *src, const char *tgt, const char *fst, 707 unsigned long flags, const void *data) 708 { 709 return my_syscall5(__NR_mount, src, tgt, fst, flags, data); 710 } 711 712 static __attribute__((unused)) 713 int mount(const char *src, const char *tgt, 714 const char *fst, unsigned long flags, 715 const void *data) 716 { 717 return __sysret(sys_mount(src, tgt, fst, flags, data)); 718 } 719 720 721 /* 722 * int open(const char *path, int flags[, mode_t mode]); 723 */ 724 725 static __attribute__((unused)) 726 int sys_open(const char *path, int flags, mode_t mode) 727 { 728 #ifdef __NR_openat 729 return my_syscall4(__NR_openat, AT_FDCWD, path, flags, mode); 730 #elif defined(__NR_open) 731 return my_syscall3(__NR_open, path, flags, mode); 732 #else 733 return -ENOSYS; 734 #endif 735 } 736 737 static __attribute__((unused)) 738 int open(const char *path, int flags, ...) 739 { 740 mode_t mode = 0; 741 742 if (flags & O_CREAT) { 743 va_list args; 744 745 va_start(args, flags); 746 mode = va_arg(args, int); 747 va_end(args); 748 } 749 750 return __sysret(sys_open(path, flags, mode)); 751 } 752 753 754 /* 755 * int pipe2(int pipefd[2], int flags); 756 * int pipe(int pipefd[2]); 757 */ 758 759 static __attribute__((unused)) 760 int sys_pipe2(int pipefd[2], int flags) 761 { 762 return my_syscall2(__NR_pipe2, pipefd, flags); 763 } 764 765 static __attribute__((unused)) 766 int pipe2(int pipefd[2], int flags) 767 { 768 return __sysret(sys_pipe2(pipefd, flags)); 769 } 770 771 static __attribute__((unused)) 772 int pipe(int pipefd[2]) 773 { 774 return pipe2(pipefd, 0); 775 } 776 777 778 /* 779 * int prctl(int option, unsigned long arg2, unsigned long arg3, 780 * unsigned long arg4, unsigned long arg5); 781 */ 782 783 static __attribute__((unused)) 784 int sys_prctl(int option, unsigned long arg2, unsigned long arg3, 785 unsigned long arg4, unsigned long arg5) 786 { 787 return my_syscall5(__NR_prctl, option, arg2, arg3, arg4, arg5); 788 } 789 790 static __attribute__((unused)) 791 int prctl(int option, unsigned long arg2, unsigned long arg3, 792 unsigned long arg4, unsigned long arg5) 793 { 794 return __sysret(sys_prctl(option, arg2, arg3, arg4, arg5)); 795 } 796 797 798 /* 799 * int pivot_root(const char *new, const char *old); 800 */ 801 802 static __attribute__((unused)) 803 int sys_pivot_root(const char *new, const char *old) 804 { 805 return my_syscall2(__NR_pivot_root, new, old); 806 } 807 808 static __attribute__((unused)) 809 int pivot_root(const char *new, const char *old) 810 { 811 return __sysret(sys_pivot_root(new, old)); 812 } 813 814 815 /* 816 * int poll(struct pollfd *fds, int nfds, int timeout); 817 */ 818 819 static __attribute__((unused)) 820 int sys_poll(struct pollfd *fds, int nfds, int timeout) 821 { 822 #if defined(__NR_ppoll) 823 struct timespec t; 824 825 if (timeout >= 0) { 826 t.tv_sec = timeout / 1000; 827 t.tv_nsec = (timeout % 1000) * 1000000; 828 } 829 return my_syscall5(__NR_ppoll, fds, nfds, (timeout >= 0) ? &t : NULL, NULL, 0); 830 #elif defined(__NR_poll) 831 return my_syscall3(__NR_poll, fds, nfds, timeout); 832 #else 833 return -ENOSYS; 834 #endif 835 } 836 837 static __attribute__((unused)) 838 int poll(struct pollfd *fds, int nfds, int timeout) 839 { 840 return __sysret(sys_poll(fds, nfds, timeout)); 841 } 842 843 844 /* 845 * ssize_t read(int fd, void *buf, size_t count); 846 */ 847 848 static __attribute__((unused)) 849 ssize_t sys_read(int fd, void *buf, size_t count) 850 { 851 return my_syscall3(__NR_read, fd, buf, count); 852 } 853 854 static __attribute__((unused)) 855 ssize_t read(int fd, void *buf, size_t count) 856 { 857 return __sysret(sys_read(fd, buf, count)); 858 } 859 860 861 /* 862 * int reboot(int cmd); 863 * <cmd> is among LINUX_REBOOT_CMD_* 864 */ 865 866 static __attribute__((unused)) 867 ssize_t sys_reboot(int magic1, int magic2, int cmd, void *arg) 868 { 869 return my_syscall4(__NR_reboot, magic1, magic2, cmd, arg); 870 } 871 872 static __attribute__((unused)) 873 int reboot(int cmd) 874 { 875 return __sysret(sys_reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, 0)); 876 } 877 878 879 /* 880 * int sched_yield(void); 881 */ 882 883 static __attribute__((unused)) 884 int sys_sched_yield(void) 885 { 886 return my_syscall0(__NR_sched_yield); 887 } 888 889 static __attribute__((unused)) 890 int sched_yield(void) 891 { 892 return __sysret(sys_sched_yield()); 893 } 894 895 896 /* 897 * int select(int nfds, fd_set *read_fds, fd_set *write_fds, 898 * fd_set *except_fds, struct timeval *timeout); 899 */ 900 901 static __attribute__((unused)) 902 int sys_select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout) 903 { 904 #if defined(__ARCH_WANT_SYS_OLD_SELECT) && !defined(__NR__newselect) 905 struct sel_arg_struct { 906 unsigned long n; 907 fd_set *r, *w, *e; 908 struct timeval *t; 909 } arg = { .n = nfds, .r = rfds, .w = wfds, .e = efds, .t = timeout }; 910 return my_syscall1(__NR_select, &arg); 911 #elif defined(__ARCH_WANT_SYS_PSELECT6) && defined(__NR_pselect6) 912 struct timespec t; 913 914 if (timeout) { 915 t.tv_sec = timeout->tv_sec; 916 t.tv_nsec = timeout->tv_usec * 1000; 917 } 918 return my_syscall6(__NR_pselect6, nfds, rfds, wfds, efds, timeout ? &t : NULL, NULL); 919 #elif defined(__NR__newselect) || defined(__NR_select) 920 #ifndef __NR__newselect 921 #define __NR__newselect __NR_select 922 #endif 923 return my_syscall5(__NR__newselect, nfds, rfds, wfds, efds, timeout); 924 #else 925 return -ENOSYS; 926 #endif 927 } 928 929 static __attribute__((unused)) 930 int select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout) 931 { 932 return __sysret(sys_select(nfds, rfds, wfds, efds, timeout)); 933 } 934 935 936 /* 937 * int setpgid(pid_t pid, pid_t pgid); 938 */ 939 940 static __attribute__((unused)) 941 int sys_setpgid(pid_t pid, pid_t pgid) 942 { 943 return my_syscall2(__NR_setpgid, pid, pgid); 944 } 945 946 static __attribute__((unused)) 947 int setpgid(pid_t pid, pid_t pgid) 948 { 949 return __sysret(sys_setpgid(pid, pgid)); 950 } 951 952 953 /* 954 * pid_t setsid(void); 955 */ 956 957 static __attribute__((unused)) 958 pid_t sys_setsid(void) 959 { 960 return my_syscall0(__NR_setsid); 961 } 962 963 static __attribute__((unused)) 964 pid_t setsid(void) 965 { 966 return __sysret(sys_setsid()); 967 } 968 969 /* 970 * int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf); 971 * int stat(const char *path, struct stat *buf); 972 */ 973 974 static __attribute__((unused)) 975 int sys_statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf) 976 { 977 #ifdef __NR_statx 978 return my_syscall5(__NR_statx, fd, path, flags, mask, buf); 979 #else 980 return -ENOSYS; 981 #endif 982 } 983 984 static __attribute__((unused)) 985 int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf) 986 { 987 return __sysret(sys_statx(fd, path, flags, mask, buf)); 988 } 989 990 991 static __attribute__((unused)) 992 int stat(const char *path, struct stat *buf) 993 { 994 struct statx statx; 995 long ret; 996 997 ret = __sysret(sys_statx(AT_FDCWD, path, AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &statx)); 998 if (ret == -1) 999 return ret; 1000 1001 buf->st_dev = ((statx.stx_dev_minor & 0xff) 1002 | (statx.stx_dev_major << 8) 1003 | ((statx.stx_dev_minor & ~0xff) << 12)); 1004 buf->st_ino = statx.stx_ino; 1005 buf->st_mode = statx.stx_mode; 1006 buf->st_nlink = statx.stx_nlink; 1007 buf->st_uid = statx.stx_uid; 1008 buf->st_gid = statx.stx_gid; 1009 buf->st_rdev = ((statx.stx_rdev_minor & 0xff) 1010 | (statx.stx_rdev_major << 8) 1011 | ((statx.stx_rdev_minor & ~0xff) << 12)); 1012 buf->st_size = statx.stx_size; 1013 buf->st_blksize = statx.stx_blksize; 1014 buf->st_blocks = statx.stx_blocks; 1015 buf->st_atim.tv_sec = statx.stx_atime.tv_sec; 1016 buf->st_atim.tv_nsec = statx.stx_atime.tv_nsec; 1017 buf->st_mtim.tv_sec = statx.stx_mtime.tv_sec; 1018 buf->st_mtim.tv_nsec = statx.stx_mtime.tv_nsec; 1019 buf->st_ctim.tv_sec = statx.stx_ctime.tv_sec; 1020 buf->st_ctim.tv_nsec = statx.stx_ctime.tv_nsec; 1021 1022 return 0; 1023 } 1024 1025 1026 /* 1027 * int symlink(const char *old, const char *new); 1028 */ 1029 1030 static __attribute__((unused)) 1031 int sys_symlink(const char *old, const char *new) 1032 { 1033 #ifdef __NR_symlinkat 1034 return my_syscall3(__NR_symlinkat, old, AT_FDCWD, new); 1035 #elif defined(__NR_symlink) 1036 return my_syscall2(__NR_symlink, old, new); 1037 #else 1038 return -ENOSYS; 1039 #endif 1040 } 1041 1042 static __attribute__((unused)) 1043 int symlink(const char *old, const char *new) 1044 { 1045 return __sysret(sys_symlink(old, new)); 1046 } 1047 1048 1049 /* 1050 * mode_t umask(mode_t mode); 1051 */ 1052 1053 static __attribute__((unused)) 1054 mode_t sys_umask(mode_t mode) 1055 { 1056 return my_syscall1(__NR_umask, mode); 1057 } 1058 1059 static __attribute__((unused)) 1060 mode_t umask(mode_t mode) 1061 { 1062 return sys_umask(mode); 1063 } 1064 1065 1066 /* 1067 * int umount2(const char *path, int flags); 1068 */ 1069 1070 static __attribute__((unused)) 1071 int sys_umount2(const char *path, int flags) 1072 { 1073 return my_syscall2(__NR_umount2, path, flags); 1074 } 1075 1076 static __attribute__((unused)) 1077 int umount2(const char *path, int flags) 1078 { 1079 return __sysret(sys_umount2(path, flags)); 1080 } 1081 1082 1083 /* 1084 * int unlink(const char *path); 1085 */ 1086 1087 static __attribute__((unused)) 1088 int sys_unlink(const char *path) 1089 { 1090 #ifdef __NR_unlinkat 1091 return my_syscall3(__NR_unlinkat, AT_FDCWD, path, 0); 1092 #elif defined(__NR_unlink) 1093 return my_syscall1(__NR_unlink, path); 1094 #else 1095 return -ENOSYS; 1096 #endif 1097 } 1098 1099 static __attribute__((unused)) 1100 int unlink(const char *path) 1101 { 1102 return __sysret(sys_unlink(path)); 1103 } 1104 1105 1106 /* 1107 * pid_t wait(int *status); 1108 * pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage); 1109 * pid_t waitpid(pid_t pid, int *status, int options); 1110 */ 1111 1112 static __attribute__((unused)) 1113 pid_t sys_wait4(pid_t pid, int *status, int options, struct rusage *rusage) 1114 { 1115 #ifdef __NR_wait4 1116 return my_syscall4(__NR_wait4, pid, status, options, rusage); 1117 #else 1118 return -ENOSYS; 1119 #endif 1120 } 1121 1122 static __attribute__((unused)) 1123 pid_t wait(int *status) 1124 { 1125 return __sysret(sys_wait4(-1, status, 0, NULL)); 1126 } 1127 1128 static __attribute__((unused)) 1129 pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage) 1130 { 1131 return __sysret(sys_wait4(pid, status, options, rusage)); 1132 } 1133 1134 1135 static __attribute__((unused)) 1136 pid_t waitpid(pid_t pid, int *status, int options) 1137 { 1138 return __sysret(sys_wait4(pid, status, options, NULL)); 1139 } 1140 1141 1142 /* 1143 * ssize_t write(int fd, const void *buf, size_t count); 1144 */ 1145 1146 static __attribute__((unused)) 1147 ssize_t sys_write(int fd, const void *buf, size_t count) 1148 { 1149 return my_syscall3(__NR_write, fd, buf, count); 1150 } 1151 1152 static __attribute__((unused)) 1153 ssize_t write(int fd, const void *buf, size_t count) 1154 { 1155 return __sysret(sys_write(fd, buf, count)); 1156 } 1157 1158 1159 /* 1160 * int memfd_create(const char *name, unsigned int flags); 1161 */ 1162 1163 static __attribute__((unused)) 1164 int sys_memfd_create(const char *name, unsigned int flags) 1165 { 1166 return my_syscall2(__NR_memfd_create, name, flags); 1167 } 1168 1169 static __attribute__((unused)) 1170 int memfd_create(const char *name, unsigned int flags) 1171 { 1172 return __sysret(sys_memfd_create(name, flags)); 1173 } 1174 1175 /* make sure to include all global symbols */ 1176 #include "nolibc.h" 1177 1178 #endif /* _NOLIBC_SYS_H */ 1179