add function for handling PTRACE_SETOPTIONS nicely

src/sys/ptrace.rs

@@ -41,6 +41,27 @@ pub mod ptrace {
     pub const PTRACE_INTERRUPT:   PtraceRequest = 0x4207;
     pub const PTRACE_LISTEN:      PtraceRequest = 0x4208;
     pub const PTRACE_PEEKSIGINFO: PtraceRequest = 0x4209;
+
+    pub type PtraceEvent = c_int;
+
+    pub const PTRACE_EVENT_FORK:       PtraceEvent = 1;
+    pub const PTRACE_EVENT_VFORK:      PtraceEvent = 2;
+    pub const PTRACE_EVENT_CLONE:      PtraceEvent = 3;
+    pub const PTRACE_EVENT_EXEC:       PtraceEvent = 4;
+    pub const PTRACE_EVENT_VFORK_DONE: PtraceEvent = 5;
+    pub const PTRACE_EVENT_EXIT:       PtraceEvent = 6;
+    pub const PTRACE_EVENT_SECCOMP:    PtraceEvent = 6;
+    pub const PTRACE_EVENT_STOP:       PtraceEvent = 128;
+
+    pub type PtraceOptions = c_int;
+    pub const PTRACE_O_TRACESYSGOOD: PtraceOptions   = 1;
+    pub const PTRACE_O_TRACEFORK: PtraceOptions      = (1 << PTRACE_EVENT_FORK);
+    pub const PTRACE_O_TRACEVFORK: PtraceOptions     = (1 << PTRACE_EVENT_VFORK);
+    pub const PTRACE_O_TRACECLONE: PtraceOptions     = (1 << PTRACE_EVENT_CLONE);
+    pub const PTRACE_O_TRACEEXEC: PtraceOptions      = (1 << PTRACE_EVENT_EXEC);
+    pub const PTRACE_O_TRACEVFORKDONE: PtraceOptions = (1 << PTRACE_EVENT_VFORK_DONE);
+    pub const PTRACE_O_TRACEEXIT: PtraceOptions      = (1 << PTRACE_EVENT_EXIT);
+    pub const PTRACE_O_TRACESECCOMP: PtraceOptions   = (1 << PTRACE_EVENT_SECCOMP);
 }
 
 mod ffi {
@@ -77,3 +98,13 @@ fn ptrace_other(request: ptrace::PtraceRequest, pid: pid_t, addr: *mut c_void, d
         _  => Ok(0)
     }
 }
+
+/// Set options, as with ptrace(PTRACE_SETOPTIONS,...).
+pub fn ptrace_setoptions(pid: pid_t, options: ptrace::PtraceOptions) -> Result<()> {
+    use self::ptrace::*;
+    use std::ptr;
+
+    try!(ptrace(PTRACE_SETOPTIONS, pid, ptr::null_mut(), options as *mut c_void));
+    Ok(())
+}
+