Add public API for PTRACE_GETFPREGS and PTRACE_SETFPREGS

CHANGELOG.md

@@ -7,6 +7,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 - Added TIMESTAMPNS support for linux
   (#[1402](https://github.com/nix-rust/nix/pull/1402))
+- Added public API for the `PTRACE_GETFPREGS` and `PTRACE_SETFPREGS` requests.
+  (#[1356](https://github.com/nix-rust/nix/pull/1356))
 
 ### Changed
 - Made `forkpty` unsafe, like `fork`
@@ -32,6 +34,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Added `personality` (#[1331](https://github.com/nix-rust/nix/pull/1331))
 - Added limited Fuchsia support (#[1285](https://github.com/nix-rust/nix/pull/1285))
 - Added `getpeereid` (#[1342](https://github.com/nix-rust/nix/pull/1342))
+
+### Fixed
 - Implemented `IntoIterator` for `Dir`
   (#[1333](https://github.com/nix-rust/nix/pull/1333)).
 

src/sys/ptrace/linux.rs

@@ -16,7 +16,7 @@ pub type AddressType = *mut ::libc::c_void;
             any(target_env = "gnu", target_env = "musl")),
         all(target_arch = "x86", target_env = "gnu"))
 ))]
-use libc::user_regs_struct;
+use libc::{user_regs_struct, user_fpregs_struct};
 
 cfg_if! {
     if #[cfg(any(all(target_os = "linux", target_arch = "s390x"),
@@ -213,6 +213,34 @@ pub fn setregs(pid: Pid, regs: user_regs_struct) -> Result<()> {
     Errno::result(res).map(drop)
 }
 
+/// Get floating point registers, as with `ptrace(PTRACE_GETFPREGS, ...)`
+#[cfg(all(
+    target_os = "linux",
+    any(all(target_arch = "x86_64",
+            any(target_env = "gnu", target_env = "musl")),
+        all(target_arch = "x86", target_env = "gnu"))
+))]
+pub fn getfpregs(pid: Pid) -> Result<user_fpregs_struct> {
+    ptrace_get_data::<user_fpregs_struct>(Request::PTRACE_GETFPREGS, pid)
+}
+
+/// Set floating point registers, as with `ptrace(PTRACE_SETFPREGS)`
+#[cfg(all(
+    target_os = "linux",
+    any(all(target_arch = "x86_64",
+            any(target_env = "gnu", target_env = "musl")),
+        all(target_arch = "x86", target_env = "gnu"))
+))]
+pub fn setfpregs(pid: Pid, regs: user_fpregs_struct) -> Result<()> {
+    let res = unsafe {
+        libc::ptrace(Request::PTRACE_SETFPREGS as RequestType,
+                     libc::pid_t::from(pid),
+                     ptr::null_mut::<c_void>(),
+                     &regs as *const _ as *const c_void)
+    };
+    Errno::result(res).map(drop)
+}
+
 /// Function for ptrace requests that return values from the data field.
 /// Some ptrace get requests populate structs or larger elements than `c_long`
 /// and therefore use the data field to return values. This function handles these