64-bit stat size, read entire executable in one go

kernel/scheme/env.rs

@@ -159,7 +159,7 @@ impl Scheme for EnvScheme {
         let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
 
         stat.st_mode = handle.mode;
-        stat.st_size = handle.data.lock().len() as u32; //TODO: st_size 64-bit
+        stat.st_size = handle.data.lock().len() as u64;
 
         Ok(0)
     }

kernel/scheme/initfs.rs

@@ -130,7 +130,7 @@ impl Scheme for InitFsScheme {
         let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
 
         stat.st_mode = handle.mode;
-        stat.st_size = handle.data.len() as u32; //TODO: st_size 64-bit
+        stat.st_size = handle.data.len() as u64;
 
         Ok(0)
     }

kernel/syscall/process.rs

@@ -17,6 +17,7 @@ use context::memory::Grant;
 use elf::{self, program_header};
 use scheme;
 use syscall;
+use syscall::data::Stat;
 use syscall::error::*;
 use syscall::flag::{CLONE_VM, CLONE_FS, CLONE_FILES, MAP_WRITE, MAP_WRITE_COMBINE, WNOHANG};
 use syscall::validate::{validate_slice, validate_slice_mut};
@@ -391,17 +392,11 @@ pub fn exec(path: &[u8], arg_ptrs: &[[usize; 2]]) -> Result<usize> {
         }
 
         let file = syscall::open(path, 0)?;
+        let mut stat = Stat::default();
+        syscall::fstat(file, &mut stat)?;
         //TODO: Only read elf header, not entire file. Then read required segments
-        let mut data = vec![];
-        loop {
-            let mut buf = [0; 16384];
-            let count = syscall::read(file, &mut buf)?;
-            if count > 0 {
-                data.extend_from_slice(&buf[..count]);
-            } else {
-                break;
-            }
-        }
+        let mut data = vec![0; stat.st_size as usize];
+        syscall::read(file, &mut data)?;
         let _ = syscall::close(file);
 
         match elf::Elf::from(&data) {

libstd

@@ -1 +1 @@
-Subproject commit 4dbfda17c3c2e2a0d88687a42151fc8a81f28ca0
+Subproject commit 9b2e8ea8196cdf8023fb54e8581f94e45b8dec4f

schemes/redoxfs

@@ -1 +1 @@
-Subproject commit 36b3cf04a9d35b85d481acdf99494fc535152cf0
+Subproject commit 1488d1ef5661496aff695f2e1bf67997d4654329

syscall/src/data.rs

@@ -55,17 +55,10 @@ impl DerefMut for Packet {
 #[derive(Copy, Clone, Debug, Default)]
 #[repr(packed)]
 pub struct Stat {
-    pub st_dev: u16,
-    pub st_ino: u16,
     pub st_mode: u16,
-    pub st_nlink: u16,
-    pub st_uid: u16,
-    pub st_gid: u16,
-    pub st_rdev: u16,
-    pub st_size: u32,
-    pub st_atime: u32,
-    pub st_mtime: u32,
-    pub st_ctime: u32
+    pub st_uid: u32,
+    pub st_gid: u32,
+    pub st_size: u64
 }
 
 impl Deref for Stat {