From 5cd0bed79d99cd12dc29b698d1237e5333c49aa3 Mon Sep 17 00:00:00 2001
From: Dan Gohman <dev@sunfishcode.online>
Date: Tue, 3 Oct 2023 08:05:19 -0700
Subject: [PATCH] Implement `fallocate` and `clock`.

---
 c-scape/src/fs/fallocate.rs | 16 ++++++++++++++++
 c-scape/src/fs/mod.rs       |  1 +
 c-scape/src/time/mod.rs     | 12 ++++++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 c-scape/src/fs/fallocate.rs

diff --git a/c-scape/src/fs/fallocate.rs b/c-scape/src/fs/fallocate.rs
new file mode 100644
index 0000000..2c2d47d
--- /dev/null
+++ b/c-scape/src/fs/fallocate.rs
@@ -0,0 +1,16 @@
+use crate::convert_res;
+use libc::{c_int, off_t};
+use rustix::fd::BorrowedFd;
+use rustix::fs::FallocateFlags;
+
+#[no_mangle]
+unsafe extern "C" fn fallocate(fd: c_int, mode: c_int, offset: off_t, len: off_t) -> c_int {
+    libc!(libc::fallocate(fd, mode, offset, len));
+
+    let fd = BorrowedFd::borrow_raw(fd);
+    let mode = FallocateFlags::from_bits_retain(mode as _);
+    match convert_res(rustix::fs::fallocate(fd, mode, offset as _, len as _)) {
+        Some(()) => 0,
+        None => -1,
+    }
+}
diff --git a/c-scape/src/fs/mod.rs b/c-scape/src/fs/mod.rs
index a690b3d..f8871b8 100644
--- a/c-scape/src/fs/mod.rs
+++ b/c-scape/src/fs/mod.rs
@@ -3,6 +3,7 @@ mod access;
 mod chmod;
 mod dir;
 mod fadvise;
+mod fallocate;
 mod fcntl;
 mod flock;
 mod inotify;
diff --git a/c-scape/src/time/mod.rs b/c-scape/src/time/mod.rs
index 5d680be..afd6ae6 100644
--- a/c-scape/src/time/mod.rs
+++ b/c-scape/src/time/mod.rs
@@ -126,3 +126,15 @@ unsafe extern "C" fn difftime(time1: libc::time_t, time0: libc::time_t) -> f64 {
 
     (time1 as i128 - time0 as i128) as f64
 }
+
+#[no_mangle]
+unsafe extern "C" fn clock() -> libc::clock_t {
+    //libc!(libc::clock());
+
+    let time = rustix::time::clock_gettime(rustix::time::ClockId::ProcessCPUTime);
+
+    time.tv_sec
+        .checked_mul(1_000_000)
+        .map(|usec| usec + time.tv_nsec / 1000)
+        .unwrap_or(-1)
+}