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authorAdam Carpenter <53hornet@gmail.com>2019-03-27 15:32:37 -0400
committerAdam Carpenter <53hornet@gmail.com>2019-03-27 15:32:37 -0400
commit67cdcc2e12118becb823e20a40cc2687f2b8425a (patch)
treeed92c3234b89079e6d4cf36f5e80c5ffa79def48 /meap/meap-code/ch6/ch6-meminfo-win/src
parente25482fca375d318a39c3b54db396b0db6e0b263 (diff)
downloadlearning-rust-67cdcc2e12118becb823e20a40cc2687f2b8425a.tar.xz
learning-rust-67cdcc2e12118becb823e20a40cc2687f2b8425a.zip
Started Rust in Action MEAP.
Diffstat (limited to 'meap/meap-code/ch6/ch6-meminfo-win/src')
-rw-r--r--meap/meap-code/ch6/ch6-meminfo-win/src/main.rs59
1 files changed, 59 insertions, 0 deletions
diff --git a/meap/meap-code/ch6/ch6-meminfo-win/src/main.rs b/meap/meap-code/ch6/ch6-meminfo-win/src/main.rs
new file mode 100644
index 0000000..cbeb18b
--- /dev/null
+++ b/meap/meap-code/ch6/ch6-meminfo-win/src/main.rs
@@ -0,0 +1,59 @@
+extern crate kernel32;
+extern crate winapi;
+
+use winapi::{
+ DWORD, // <1> u32
+ HANDLE, // <2> Pointer types for various internal APIs without an associated type. In Rust, defined in `std::os::raw::c_void`
+ LPVOID, // <2>
+ PVOID, // <3>
+ SIZE_T, // <4> u64 (usize on this machine)
+ LPSYSTEM_INFO, // <5> A pointer to a SYSTEM_INFO struct
+ SYSTEM_INFO, // <6> Some structs defined by Windows internally
+ MEMORY_BASIC_INFORMATION, // <6>
+};
+
+fn main() {
+ let this_pid: DWORD; // <7> These variables will be initialized from within `unsafe` blocks. To make them accessible in the outer scope, they need to be defined here.
+ let this_proc: HANDLE; // <7>
+ let min_app_addr: LPVOID; // <7>
+ let max_app_addr: LPVOID; // <7>
+ let mut base_addr: PVOID; // <7>
+ let mut proc_info: SYSTEM_INFO; // <7>
+ let mut mem_info: MEMORY_BASIC_INFORMATION; // <7>
+
+ const MEMINFO_SIZE: usize = std::mem::size_of::<MEMORY_BASIC_INFORMATION>();
+
+ unsafe { // <8> This block guarantees that all memory is initialized
+ base_addr = std::mem::zeroed();
+ proc_info = std::mem::zeroed();
+ mem_info = std::mem::zeroed();
+ }
+
+ unsafe { // <9> This block of code is where system calls are made
+ this_pid = kernel32::GetCurrentProcessId();
+ this_proc = kernel32::GetCurrentProcess();
+ kernel32::GetSystemInfo(&mut proc_info as LPSYSTEM_INFO); // <10> Rather than use a return value, this function makes use of a C idiom to provide its result to the caller. We provide a pointer to some pre-defined struct, then read that struct's new values once the function has returned to see the results.
+ };
+
+ min_app_addr = proc_info.lpMinimumApplicationAddress; // <11> Renaming these variables for convienence.
+ max_app_addr = proc_info.lpMaximumApplicationAddress; // <11>
+
+ println!("{:?} @ {:p}", this_pid, this_proc);
+ println!("{:?}", proc_info);
+ println!("min: {:p}, max: {:p}", min_app_addr, max_app_addr);
+
+
+ loop { // <12> This loop does the work of scanning through the address space
+ let rc: SIZE_T = unsafe {
+ kernel32::VirtualQueryEx(this_proc, base_addr,
+ &mut mem_info, MEMINFO_SIZE as SIZE_T)
+ };
+
+ if rc == 0 {
+ break
+ }
+
+ println!("{:#?}", mem_info);
+ base_addr = ((base_addr as u64) + mem_info.RegionSize) as PVOID;
+ }
+} \ No newline at end of file