Implement more system calls

kernel/syscall/fs.rs

@@ -2,6 +2,7 @@
 
 use context;
 use scheme;
+use syscall::data::Stat;
 use syscall::error::*;
 
 /// Change the current working directory
@@ -97,6 +98,24 @@ pub fn dup(fd: usize) -> Result<usize> {
     scheme.dup(file.number)
 }
 
+/// Get information about the file
+pub fn fstat(fd: usize, stat: &mut Stat) -> Result<usize> {
+    let file = {
+        let contexts = context::contexts();
+        let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
+        let context = context_lock.read();
+        let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
+        file
+    };
+
+    let scheme = {
+        let schemes = scheme::schemes();
+        let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
+        scheme.clone()
+    };
+    scheme.fstat(file.number, stat)
+}
+
 /// Sync the file descriptor
 pub fn fsync(fd: usize) -> Result<usize> {
     let file = {
@@ -115,6 +134,24 @@ pub fn fsync(fd: usize) -> Result<usize> {
     scheme.fsync(file.number)
 }
 
+/// Seek to an offset
+pub fn lseek(fd: usize, pos: usize, whence: usize) -> Result<usize> {
+    let file = {
+        let contexts = context::contexts();
+        let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
+        let context = context_lock.read();
+        let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
+        file
+    };
+
+    let scheme = {
+        let schemes = scheme::schemes();
+        let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
+        scheme.clone()
+    };
+    scheme.seek(file.number, pos, whence)
+}
+
 /// Read syscall
 pub fn read(fd: usize, buf: &mut [u8]) -> Result<usize> {
     let file = {

kernel/syscall/mod.rs

@@ -2,14 +2,16 @@
 
 extern crate syscall;
 
-pub use self::syscall::{error, number, scheme};
+pub use self::syscall::{data, error, flag, number, scheme};
 
-use self::error::{Error, Result, ENOSYS};
-use self::number::*;
 pub use self::fs::*;
 pub use self::process::*;
 pub use self::validate::*;
 
+use self::data::Stat;
+use self::error::{Error, Result, ENOSYS};
+use self::number::*;
+
 /// Filesystem syscalls
 pub mod fs;
 
@@ -32,7 +34,9 @@ pub extern fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize
             SYS_WAITPID => waitpid(b, c, d),
             SYS_EXECVE => exec(validate_slice(b as *const u8, c)?, validate_slice(d as *const [usize; 2], e)?),
             SYS_CHDIR => chdir(validate_slice(b as *const u8, c)?),
+            SYS_LSEEK => lseek(b, c, d),
             SYS_GETPID => getpid(),
+            SYS_FSTAT => fstat(b, &mut validate_slice_mut(b as *mut Stat, 1)?[0]),
             SYS_DUP => dup(b),
             SYS_BRK => brk(b),
             SYS_IOPL => iopl(b),