src/basic/missing_syscall.h

   1 #pragma once
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7   Copyright 2016 Zbigniew Jędrzejewski-Szmek
   8
   9   systemd is free software; you can redistribute it and/or modify it
  10   under the terms of the GNU Lesser General Public License as published by
  11   the Free Software Foundation; either version 2.1 of the License, or
  12   (at your option) any later version.
  13
  14   systemd is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   Lesser General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  21 ***/
  22
  23 /* Missing glibc definitions to access certain kernel APIs */
  24
  25 #if !HAVE_DECL_PIVOT_ROOT
  26 static inline int pivot_root(const char *new_root, const char *put_old) {
  27         return syscall(SYS_pivot_root, new_root, put_old);
  28 }
  29 #endif
  30
  31 /* ======================================================================= */
  32
  33 #if !HAVE_DECL_MEMFD_CREATE
  34 #  ifndef __NR_memfd_create
  35 #    if defined __x86_64__
  36 #      define __NR_memfd_create 319
  37 #    elif defined __arm__
  38 #      define __NR_memfd_create 385
  39 #    elif defined __aarch64__
  40 #      define __NR_memfd_create 279
  41 #    elif defined __s390__
  42 #      define __NR_memfd_create 350
  43 #    elif defined _MIPS_SIM
  44 #      if _MIPS_SIM == _MIPS_SIM_ABI32
  45 #        define __NR_memfd_create 4354
  46 #      endif
  47 #      if _MIPS_SIM == _MIPS_SIM_NABI32
  48 #        define __NR_memfd_create 6318
  49 #      endif
  50 #      if _MIPS_SIM == _MIPS_SIM_ABI64
  51 #        define __NR_memfd_create 5314
  52 #      endif
  53 #    elif defined __i386__
  54 #      define __NR_memfd_create 356
  55 #    else
  56 #      warning "__NR_memfd_create unknown for your architecture"
  57 #    endif
  58 #  endif
  59
  60 static inline int memfd_create(const char *name, unsigned int flags) {
  61 #  ifdef __NR_memfd_create
  62         return syscall(__NR_memfd_create, name, flags);
  63 #  else
  64         errno = ENOSYS;
  65         return -1;
  66 #  endif
  67 }
  68 #endif
  69
  70 /* ======================================================================= */
  71
  72 #if !HAVE_DECL_GETRANDOM
  73 #  ifndef __NR_getrandom
  74 #    if defined __x86_64__
  75 #      define __NR_getrandom 318
  76 #    elif defined(__i386__)
  77 #      define __NR_getrandom 355
  78 #    elif defined(__arm__)
  79 #      define __NR_getrandom 384
  80 #   elif defined(__aarch64__)
  81 #      define __NR_getrandom 278
  82 #    elif defined(__ia64__)
  83 #      define __NR_getrandom 1339
  84 #    elif defined(__m68k__)
  85 #      define __NR_getrandom 352
  86 #    elif defined(__s390x__)
  87 #      define __NR_getrandom 349
  88 #    elif defined(__powerpc__)
  89 #      define __NR_getrandom 359
  90 #    elif defined _MIPS_SIM
  91 #      if _MIPS_SIM == _MIPS_SIM_ABI32
  92 #        define __NR_getrandom 4353
  93 #      endif
  94 #      if _MIPS_SIM == _MIPS_SIM_NABI32
  95 #        define __NR_getrandom 6317
  96 #      endif
  97 #      if _MIPS_SIM == _MIPS_SIM_ABI64
  98 #        define __NR_getrandom 5313
  99 #      endif
 100 #    else
 101 #      warning "__NR_getrandom unknown for your architecture"
 102 #    endif
 103 #  endif
 104
 105 static inline int getrandom(void *buffer, size_t count, unsigned flags) {
 106 #  ifdef __NR_getrandom
 107         return syscall(__NR_getrandom, buffer, count, flags);
 108 #  else
 109         errno = ENOSYS;
 110         return -1;
 111 #  endif
 112 }
 113 #endif
 114
 115 /* ======================================================================= */
 116
 117 #if !HAVE_DECL_GETTID
 118 static inline pid_t gettid(void) {
 119         return (pid_t) syscall(SYS_gettid);
 120 }
 121 #endif
 122
 123 /* ======================================================================= */
 124
 125 #if !HAVE_DECL_NAME_TO_HANDLE_AT
 126 #  ifndef __NR_name_to_handle_at
 127 #    if defined(__x86_64__)
 128 #      define __NR_name_to_handle_at 303
 129 #    elif defined(__i386__)
 130 #      define __NR_name_to_handle_at 341
 131 #    elif defined(__arm__)
 132 #      define __NR_name_to_handle_at 370
 133 #    elif defined(__powerpc__)
 134 #      define __NR_name_to_handle_at 345
 135 #    else
 136 #      error "__NR_name_to_handle_at is not defined"
 137 #    endif
 138 #  endif
 139
 140 struct file_handle {
 141         unsigned int handle_bytes;
 142         int handle_type;
 143         unsigned char f_handle[0];
 144 };
 145
 146 static inline int name_to_handle_at(int fd, const char *name, struct file_handle *handle, int *mnt_id, int flags) {
 147 #  ifdef __NR_name_to_handle_at
 148         return syscall(__NR_name_to_handle_at, fd, name, handle, mnt_id, flags);
 149 #  else
 150         errno = ENOSYS;
 151         return -1;
 152 #  endif
 153 }
 154 #endif
 155
 156 /* ======================================================================= */
 157
 158 #if !HAVE_DECL_SETNS
 159 #  ifndef __NR_setns
 160 #    if defined(__x86_64__)
 161 #      define __NR_setns 308
 162 #    elif defined(__i386__)
 163 #      define __NR_setns 346
 164 #    else
 165 #      error "__NR_setns is not defined"
 166 #    endif
 167 #  endif
 168
 169 static inline int setns(int fd, int nstype) {
 170 #  ifdef __NR_setns
 171         return syscall(__NR_setns, fd, nstype);
 172 #  else
 173         errno = ENOSYS;
 174         return -1;
 175 #  endif
 176 }
 177 #endif
 178
 179 /* ======================================================================= */
 180
 181 static inline pid_t raw_getpid(void) {
 182 #if defined(__alpha__)
 183         return (pid_t) syscall(__NR_getxpid);
 184 #else
 185         return (pid_t) syscall(__NR_getpid);
 186 #endif
 187 }
 188
 189 /* ======================================================================= */
 190
 191 #if !HAVE_DECL_RENAMEAT2
 192 #  ifndef __NR_renameat2
 193 #    if defined __x86_64__
 194 #      define __NR_renameat2 316
 195 #    elif defined __arm__
 196 #      define __NR_renameat2 382
 197 #    elif defined __aarch64__
 198 #      define __NR_renameat2 276
 199 #    elif defined _MIPS_SIM
 200 #      if _MIPS_SIM == _MIPS_SIM_ABI32
 201 #        define __NR_renameat2 4351
 202 #      endif
 203 #      if _MIPS_SIM == _MIPS_SIM_NABI32
 204 #        define __NR_renameat2 6315
 205 #      endif
 206 #      if _MIPS_SIM == _MIPS_SIM_ABI64
 207 #        define __NR_renameat2 5311
 208 #      endif
 209 #    elif defined __i386__
 210 #      define __NR_renameat2 353
 211 #    else
 212 #      warning "__NR_renameat2 unknown for your architecture"
 213 #    endif
 214 #  endif
 215
 216 static inline int renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) {
 217 #  ifdef __NR_renameat2
 218         return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags);
 219 #  else
 220         errno = ENOSYS;
 221         return -1;
 222 #  endif
 223 }
 224 #endif
 225
 226 /* ======================================================================= */
 227
 228 #if !HAVE_DECL_KCMP
 229 static inline int kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
 230 #  ifdef __NR_kcmp
 231         return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
 232 #  else
 233         errno = ENOSYS;
 234         return -1;
 235 #  endif
 236 }
 237 #endif
 238
 239 /* ======================================================================= */
 240
 241 #if !HAVE_DECL_KEYCTL
 242 static inline long keyctl(int cmd, unsigned long arg2, unsigned long arg3, unsigned long arg4,unsigned long arg5) {
 243 #  ifdef __NR_keyctl
 244         return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
 245 #  else
 246         errno = ENOSYS;
 247         return -1;
 248 #  endif
 249 }
 250
 251 static inline key_serial_t add_key(const char *type, const char *description, const void *payload, size_t plen, key_serial_t ringid) {
 252 #  ifdef __NR_add_key
 253         return syscall(__NR_add_key, type, description, payload, plen, ringid);
 254 #  else
 255         errno = ENOSYS;
 256         return -1;
 257 #  endif
 258 }
 259
 260 static inline key_serial_t request_key(const char *type, const char *description, const char * callout_info, key_serial_t destringid) {
 261 #  ifdef __NR_request_key
 262         return syscall(__NR_request_key, type, description, callout_info, destringid);
 263 #  else
 264         errno = ENOSYS;
 265         return -1;
 266 #  endif
 267 }
 268 #endif
 269
 270 /* ======================================================================= */
 271
 272 #if !HAVE_DECL_COPY_FILE_RANGE
 273 #  ifndef __NR_copy_file_range
 274 #    if defined(__x86_64__)
 275 #      define __NR_copy_file_range 326
 276 #    elif defined(__i386__)
 277 #      define __NR_copy_file_range 377
 278 #    elif defined __s390__
 279 #      define __NR_copy_file_range 375
 280 #    elif defined __arm__
 281 #      define __NR_copy_file_range 391
 282 #    elif defined __aarch64__
 283 #      define __NR_copy_file_range 285
 284 #    elif defined __powerpc__
 285 #      define __NR_copy_file_range 379
 286 #    else
 287 #      warning "__NR_copy_file_range not defined for your architecture"
 288 #    endif
 289 #  endif
 290
 291 static inline ssize_t copy_file_range(int fd_in, loff_t *off_in,
 292                                       int fd_out, loff_t *off_out,
 293                                       size_t len,
 294                                       unsigned int flags) {
 295 #  ifdef __NR_copy_file_range
 296         return syscall(__NR_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags);
 297 #  else
 298         errno = ENOSYS;
 299         return -1;
 300 #  endif
 301 }
 302 #endif