Extending filesystem support for hermit-os

Cargo.lock

@@ -1585,6 +1585,10 @@ name = "hermit-abi"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
+
+[[package]]
+name = "hermit-abi"
+version = "0.3.3"
 dependencies = [
  "compiler_builtins",
  "rustc-std-workspace-alloc",
@@ -1953,14 +1957,8 @@ version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "24fddda5af7e54bf7da53067d6e802dbcc381d0a8eef629df528e3ebf68755cb"
 dependencies = [
-<<<<<<< HEAD
  "hermit-abi 0.3.2",
  "rustix 0.38.2",
-=======
- "hermit-abi 0.3.1",
- "io-lifetimes",
- "rustix",
->>>>>>> 3435df2bc6c (define hermit_abi as public depedenceny)
  "windows-sys 0.48.0",
 ]
 
@@ -4945,13 +4943,8 @@ dependencies = [
  "core",
  "dlmalloc",
  "fortanix-sgx-abi",
-<<<<<<< HEAD
  "hashbrown 0.14.0",
- "hermit-abi 0.3.2",
-=======
- "hashbrown 0.13.1",
- "hermit-abi 0.3.1",
->>>>>>> 3435df2bc6c (define hermit_abi as public depedenceny)
+ "hermit-abi 0.3.3",
  "libc",
  "miniz_oxide",
  "object",

library/std/src/sys/hermit/fd.rs

@@ -48,6 +48,11 @@ impl FileDesc {
     pub fn set_nonblocking(&self, _nonblocking: bool) -> io::Result<()> {
         unsupported()
     }
+
+    pub fn fstat(&self, stat: *mut abi::stat) -> io::Result<()> {
+        cvt(unsafe { abi::fstat(self.fd.as_raw_fd(), stat) })?;
+        Ok(())
+    }
 }
 
 impl<'a> Read for &'a FileDesc {