Add PTRACE_SET_SYSCALL_INFO and set_syscall_info wrapper

Author: Marcondiro

2739.added.md

@@ -0,0 +1 @@
+Added set_syscall_info to ptrace on linux

2739.changed.md

@@ -0,0 +1 @@
+Bumped libc from 0.2.180 to 0.2.181

src/sys/ptrace/linux.rs

@@ -148,6 +148,8 @@ libc_enum! {
         PTRACE_SYSEMU_SINGLESTEP,
         #[cfg(all(target_os = "linux", target_env = "gnu"))]
         PTRACE_GET_SYSCALL_INFO,
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        PTRACE_SET_SYSCALL_INFO,
     }
 }
 
@@ -576,6 +578,21 @@ pub fn syscall_info(pid: Pid) -> Result<libc::ptrace_syscall_info> {
     ptrace_get_data::<libc::ptrace_syscall_info>(Request::PTRACE_GET_SYSCALL_INFO, pid)
 }
 
+/// Set the information of the syscall that caused the stop, as with
+/// `ptrace(PTRACE_SET_SYSCALL_INFO, ...`.
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+pub fn set_syscall_info(pid: Pid, syscall_info: &libc::ptrace_syscall_info) -> Result<()> {
+    let res = unsafe {
+        libc::ptrace(
+            Request::PTRACE_SET_SYSCALL_INFO as RequestType,
+            libc::pid_t::from(pid),
+            mem::size_of::<libc::ptrace_syscall_info>(),
+            syscall_info as *const _ as *const c_void,
+        )
+    };
+    Errno::result(res).map(drop)
+}
+
 /// Sets the process as traceable, as with `ptrace(PTRACE_TRACEME, ...)`
 ///
 /// Indicates that this process is to be traced by its parent.