first commit

.gitignore

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+/target

.vscode/settings.json

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+{
+    "files.associations": {
+        "fcntl.h": "c"
+    }
+}

Cargo.toml

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+[package]
+name = "diag"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+libc = "0.2.150"
+nix = { version = "0.27.1", features = ["ioctl"]}
+

make.sh

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+cross rustc --target armv7-unknown-linux-gnueabihf --  -C target-feature=+crt-static
+adb push target/armv7-unknown-linux-gnueabihf/debug/diag /tmp/diag

src/main.rs

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+use std::fs::File;
+use std::mem;
+use std::os::unix::io::AsRawFd;
+
+fn main() {
+    const  DIAG_IOCTL_SWITCH_LOGGING: u32 = 7;
+    const MEMORY_DEVICE_MODE: i32 = 2;
+    const DIAG_IOCTL_REMOTE_DEV: u32 = 32;
+
+    let mut mode_param: [i32; 3] = [MEMORY_DEVICE_MODE, -1, 0]; // diag_logging_mode_param_t
+    let use_mdm: i32 = 0;
+
+    let diag_fd: i32;
+
+    println!("Initializing DIAG");
+
+    let diag_result = File::options().read(true).write(true).open("/dev/diag");
+    match &diag_result {
+        Ok(file) => {
+            diag_fd = file.as_raw_fd();
+        }
+        Err(_) => {
+            println!("error opening diag device.");
+            std::process::exit(1);
+        }
+    }
+
+
+    unsafe {
+        if libc::ioctl(diag_fd, DIAG_IOCTL_SWITCH_LOGGING, MEMORY_DEVICE_MODE, 0, 0, 0) < 0
+            && libc::ioctl(
+                diag_fd,
+                DIAG_IOCTL_SWITCH_LOGGING,
+                &mut mode_param as *mut _,
+                mem::size_of::<[i32; 3]>(), 0, 0, 0, 0
+            ) < 0
+        {
+            println!("ioctl failed 1");
+            //std::process::exit(1);
+        }
+    }
+
+
+    unsafe {
+        if libc::ioctl(diag_fd, DIAG_IOCTL_REMOTE_DEV, &use_mdm as *const i32) < 0 {
+            println!("ioctl failed 2");
+            std::process::exit(1);
+        }
+    }
+
+    println!("successfully opened diag device");
+
+}