Adapt to cwd only being in relibc.

Cargo.lock

@@ -96,7 +96,7 @@ dependencies = [
 [[package]]
 name = "redox-exec"
 version = "0.1.0"
-source = "git+https://gitlab.redox-os.org/redox-os/relibc.git#13e58007bcf11e9c0341d066168b90fb981f4cdf"
+source = "git+https://gitlab.redox-os.org/4lDO2/relibc.git?branch=relibc_cwd#bc8a6d2cc4d2ed4cffdfc1e4797566605c5e54ea"
 dependencies = [
  "goblin",
  "plain",

Cargo.toml

@@ -12,7 +12,8 @@ crate-type = ["staticlib"]
 [dependencies]
 linked_list_allocator = "0.9"
 redox-initfs = { git = "https://gitlab.redox-os.org/redox-os/redox-initfs.git", features = ["kernel"], default-features = false }
-redox-exec = { git = "https://gitlab.redox-os.org/redox-os/relibc.git" }
+#redox-exec = { git = "https://gitlab.redox-os.org/redox-os/relibc.git" }
+redox-exec = { git = "https://gitlab.redox-os.org/4lDO2/relibc.git", branch = "relibc_cwd" }
 redox_syscall = "0.3"
 
 [profile.release]

src/exec.rs

@@ -53,14 +53,19 @@ pub fn main() -> ! {
 
         spawn_initfs(initfs_offset, initfs_length);
     }
+    const CWD: &[u8] = b"initfs:";
+    let extrainfo = redox_exec::ExtraInfo {
+        cwd: Some(CWD),
+    };
+
     let path = "initfs:bin/init";
-    let total_args_envs_size = path.len() + 1 + envs.len() + envs.iter().map(|v| v.len()).sum::<usize>();
+    let total_args_envs_auxvpointee_size = path.len() + 1 + envs.len() + envs.iter().map(|v| v.len()).sum::<usize>() + CWD.len() + 1;
 
     let image_file = FdGuard::new(syscall::open(path, O_RDONLY).expect("failed to open init"));
     let open_via_dup = FdGuard::new(syscall::open("thisproc:current/open_via_dup", 0).expect("failed to open open_via_dup"));
     let memory = FdGuard::new(syscall::open("memory:", 0).expect("failed to open memory"));
 
-    fexec_impl(image_file, open_via_dup, &memory, path.as_bytes(), [path], envs.iter(), total_args_envs_size, None).expect("failed to execute init");
+    fexec_impl(image_file, open_via_dup, &memory, path.as_bytes(), [path], envs.iter(), total_args_envs_auxvpointee_size, &extrainfo, None).expect("failed to execute init");
 
     unreachable!()
 }
@@ -83,8 +88,6 @@ unsafe fn spawn_initfs(initfs_start: usize, initfs_length: usize) {
             let _ = syscall::close(write);
             let _ = syscall::read(read, &mut [0]);
 
-            let _ = syscall::chdir("initfs:");
-
             return;
         }
     }