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