libc-bottom-half/cloudlibc/src/libc/unistd/linkat.c

   1 // Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
   2 //
   3 // SPDX-License-Identifier: BSD-2-Clause
   4
   5 #include <common/errno.h>
   6
   7 #include <wasi/api.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12
  13 int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag) {
  14   // Create lookup properties.
  15 #ifdef __wasilibc_unmodified_upstream // split out __wasi_lookup_t
  16   __wasi_lookup_t lookup1 = {.fd = fd1, .flags = 0};
  17 #else
  18   __wasi_lookupflags_t lookup1_flags = 0;
  19 #endif
  20   if ((flag & AT_SYMLINK_FOLLOW) != 0)
  21 #ifdef __wasilibc_unmodified_upstream // split out __wasi_lookup_t
  22     lookup1.flags |= __WASI_LOOKUP_SYMLINK_FOLLOW;
  23 #else
  24     lookup1_flags |= __WASI_LOOKUPFLAGS_SYMLINK_FOLLOW;
  25 #endif
  26
  27   // Perform system call.
  28 #ifdef __wasilibc_unmodified_upstream // split out __wasi_lookup_t
  29   __wasi_errno_t error = __wasi_file_link(lookup1, path1, strlen(path1),
  30 #else
  31   __wasi_errno_t error = __wasi_path_link(fd1, lookup1_flags, path1, strlen(path1),
  32 #endif
  33                                                   fd2, path2, strlen(path2));
  34   if (error != 0) {
  35     errno = errno_fixup_directory(fd1, errno_fixup_directory(fd2, error));
  36     return -1;
  37   }
  38   return 0;
  39 }