Fix error code returned by some wasi fs syscalls for a non-existent file

[kateinoigakukun]

Description

Currently, wasmer's WASI implementation returns EINVAL when a caller gives non-existent file path as a parameter.

But EINVAL should not be returned in such case and should return ENOENT instead according to POSIX.

This change affects to:

• path_filestat_get
• path_filestat_set_times
• path_link
• path_open
• path_readlink
• path_remove_directory
• path_unlink_file

You can reproduce this issue by the following code

#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

int main(void) {
  int ret = open("/nonexist", O_RDONLY);
  if (ret < 0) {
    int e = errno;
    perror("got error");
    printf("errno = %d\n", e);
  }
  printf("ret = %d\n", ret);
  return 0;
}

$ # expected result
$ wasmtime run path_open.wasm  --mapdir /::./
got error: No such file or directory
errno = 44
ret = -1

$ # with the latest build of wasmer master branch
$ wasmer run path_open.wasm  --mapdir /::./
got error: Invalid argument
errno = 28
ret = -1

Review

• Add a short description of the change to the CHANGELOG.md file

[Amanieu]

bors r+

[bors]

Build succeeded:

• Audit
• Code lint
• Test cross-compile on linux
• Test cross-compile on macos
• Test on linux-x64
• Test on macos-x64
• Test on windows-x64