libc-bottom-half/cloudlibc/src/common/errno.h

   1 // Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
   2 //
   3 // SPDX-License-Identifier: BSD-2-Clause
   4
   5 #ifndef COMMON_ERRNO_H
   6 #define COMMON_ERRNO_H
   7
   8 #include <wasi/core.h>
   9
  10 #ifdef __wasilibc_unmodified_upstream
  11 // Translates ENOTCAPABLE to ENOTDIR if not a directory.
  12 static inline __wasi_errno_t errno_fixup_directory(__wasi_fd_t fd,
  13                                                      __wasi_errno_t error) {
  14   if (error == __WASI_ENOTCAPABLE) {
  15     __wasi_fdstat_t fds;
  16     if (__wasi_fd_stat_get(fd, &fds) == 0 &&
  17         fds.fs_filetype != __WASI_FILETYPE_DIRECTORY)
  18       return __WASI_ENOTDIR;
  19   }
  20   return error;
  21 }
  22 #else
  23 // WASI syscalls should just return ENOTDIR if that's what the problem is.
  24 static inline __wasi_errno_t errno_fixup_directory(__wasi_fd_t fd,
  25                                                      __wasi_errno_t error) {
  26   return error;
  27 }
  28 #endif
  29
  30 #ifdef __wasilibc_unmodified_upstream // posix_spawn etc.
  31 // Translates ENOTCAPABLE to EBADF if a regular file or EACCES otherwise.
  32 static inline __wasi_errno_t errno_fixup_executable(__wasi_fd_t fd,
  33                                                       __wasi_errno_t error) {
  34   if (error == __WASI_ENOTCAPABLE) {
  35     __wasi_fdstat_t fds;
  36     if (__wasi_fd_stat_get(fd, &fds) == 0)
  37       return fds.fs_filetype == __WASI_FILETYPE_REGULAR_FILE
  38                  ? __WASI_EBADF
  39                  : __WASI_EACCES;
  40   }
  41   return error;
  42 }
  43 #endif
  44
  45 #ifdef __wasilibc_unmodified_upstream // process file descriptors
  46 // Translates ENOTCAPABLE to EINVAL if not a process.
  47 static inline __wasi_errno_t errno_fixup_process(__wasi_fd_t fd,
  48                                                    __wasi_errno_t error) {
  49   if (error == __WASI_ENOTCAPABLE) {
  50     __wasi_fdstat_t fds;
  51     if (__wasi_fd_stat_get(fd, &fds) == 0 &&
  52         fds.fs_filetype != __WASI_FILETYPE_PROCESS)
  53       return __WASI_EINVAL;
  54   }
  55   return error;
  56 }
  57 #endif
  58
  59 #ifdef __wasilibc_unmodified_upstream
  60 // Translates ENOTCAPABLE to ENOTSOCK if not a socket.
  61 static inline __wasi_errno_t errno_fixup_socket(__wasi_fd_t fd,
  62                                                   __wasi_errno_t error) {
  63   if (error == __WASI_ENOTCAPABLE) {
  64     __wasi_fdstat_t fds;
  65     if (__wasi_fd_stat_get(fd, &fds) == 0 &&
  66 #ifdef __wasilibc_unmodified_upstream // don't hard-code magic numbers
  67         (fds.fs_filetype & 0xf0) != 0x80)
  68 #else
  69         (fds.fs_filetype != __WASI_FILETYPE_SOCKET_STREAM &&
  70          fds.fs_filetype != __WASI_FILETYPE_SOCKET_DGRAM))
  71 #endif
  72       return __WASI_ENOTSOCK;
  73   }
  74   return error;
  75 }
  76 #else
  77 // WASI syscalls should just return ENOTSOCK if that's what the problem is.
  78 static inline __wasi_errno_t errno_fixup_socket(__wasi_fd_t fd,
  79                                                   __wasi_errno_t error) {
  80   return error;
  81 }
  82 #endif
  83
  84 #endif