Auto merge of #1421 - DoumanAsh:expose_posix_timer_value, r=gnzlbg

Expose signal value of siginfo_t

Currently exposes it for following platforms:

- Linux has it as enum _timer and it is exposed alongside sigval
- On FreeBSD like systems si_value follows after si_addr (according to headers)
- Darwin is similar to FreeBSD
- NetBSD and FreeBSD uses struct that contains pid, uid, and si_value. Exposed via it

P.s. I'd like to take a look at other platforms too, but these are what I know so far.
FreeBSD needs some testing though

cc @gnzlbg

Author: bors

src/unix/bsd/apple/mod.rs

@@ -44,6 +44,16 @@ impl ::Clone for timezone {
     fn clone(&self) -> timezone { *self }
 }
 
+impl siginfo_t {
+    pub unsafe fn si_addr(&self) -> *mut ::c_void {
+        self.si_addr
+    }
+
+    pub unsafe fn si_value(&self) -> ::sigval {
+        self.si_value
+    }
+}
+
 s! {
     pub struct ip_mreq {
         pub imr_multiaddr: in_addr,
@@ -144,7 +154,9 @@ s! {
         pub si_uid: ::uid_t,
         pub si_status: ::c_int,
         pub si_addr: *mut ::c_void,
-        _pad: [usize; 9],
+        pub si_value: ::sigval,
+        pub si_band: ::c_long,
+        _pad: [usize; 7],
     }
 
     pub struct sigaction {

src/unix/bsd/freebsdlike/mod.rs

@@ -21,6 +21,16 @@ impl ::Clone for timezone {
     fn clone(&self) -> timezone { *self }
 }
 
+impl siginfo_t {
+    pub unsafe fn si_addr(&self) -> *mut ::c_void {
+        self.si_addr
+    }
+
+    pub unsafe fn si_value(&self) -> ::sigval {
+        self.si_value
+    }
+}
+
 s! {
     pub struct in_addr {
         pub s_addr: ::in_addr_t,
@@ -68,7 +78,8 @@ s! {
         pub si_uid: ::uid_t,
         pub si_status: ::c_int,
         pub si_addr: *mut ::c_void,
-        _pad: [::c_int; 12],
+        pub si_value: ::sigval,
+        _pad: [::c_int; 8],
     }
 
     pub struct sigaction {

src/unix/bsd/netbsdlike/mod.rs

@@ -25,6 +25,12 @@ impl ::Clone for sem {
 }
 
 s! {
+    pub struct _timer {
+        _pid: ::pid_t,
+        _uid: ::uid_t,
+        _value: ::sigval,
+    }
+
     pub struct sigaction {
         pub sa_sigaction: ::sighandler_t,
         pub sa_mask: ::sigset_t,

src/unix/bsd/netbsdlike/netbsd/mod.rs

@@ -9,6 +9,24 @@ pub type mqd_t = ::c_int;
 type __pthread_spin_t = __cpu_simple_lock_nv_t;
 pub type vm_size_t = ::uintptr_t;
 
+impl siginfo_t {
+    pub unsafe fn si_value(&self) -> ::sigval {
+        self.timer()._value
+    }
+
+    pub unsafe fn timer(&self) -> ::_timer {
+        #[repr(C)]
+        struct siginfo_timer {
+            _si_signo: ::c_int,
+            _si_errno: ::c_int,
+            _si_code: ::c_int,
+            __pad1: ::c_int,
+            timer: ::_timer,
+        }
+        (*(self as *const siginfo_t as *const siginfo_timer)).timer
+    }
+}
+
 s! {
     pub struct aiocb {
         pub aio_offset: ::off_t,

src/unix/bsd/netbsdlike/openbsd/mod.rs

@@ -308,6 +308,23 @@ s! {
     }
 }
 
+impl siginfo_t {
+    pub unsafe fn si_value(&self) -> ::sigval {
+        self.timer()._value
+    }
+
+    pub unsafe fn timer(&self) -> ::_timer {
+        #[repr(C)]
+        struct siginfo_timer {
+            _si_signo: ::c_int,
+            _si_errno: ::c_int,
+            _si_code: ::c_int,
+            timer: ::_timer,
+        }
+        (*(self as *const siginfo_t as *const siginfo_timer)).timer
+    }
+}
+
 s_no_extra_traits! {
     pub struct dirent {
         pub d_fileno: ::ino_t,

src/unix/linux_like/android/mod.rs

@@ -2192,3 +2192,20 @@ cfg_if! {
         // Unknown target_pointer_width
     }
 }
+
+impl siginfo_t {
+    pub unsafe fn si_value(&self) -> ::sigval {
+        self.timer().si_sigval
+    }
+
+    pub unsafe fn timer(&self) -> ::_timer {
+        #[repr(C)]
+        struct siginfo_timer {
+            _si_signo: ::c_int,
+            _si_errno: ::c_int,
+            _si_code: ::c_int,
+            timer: ::_timer,
+        }
+        (*(self as *const siginfo_t as *const siginfo_timer)).timer
+    }
+}

src/unix/linux_like/linux/gnu/mod.rs

@@ -193,6 +193,21 @@ impl siginfo_t {
         }
         (*(self as *const siginfo_t as *const siginfo_sigfault)).si_addr
     }
+
+    pub unsafe fn si_value(&self) -> ::sigval {
+        self.timer().si_sigval
+    }
+
+    pub unsafe fn timer(&self) -> ::_timer {
+        #[repr(C)]
+        struct siginfo_timer {
+            _si_signo: ::c_int,
+            _si_errno: ::c_int,
+            _si_code: ::c_int,
+            timer: ::_timer,
+        }
+        (*(self as *const siginfo_t as *const siginfo_timer)).timer
+    }
 }
 
 s_no_extra_traits! {

src/unix/linux_like/linux/musl/mod.rs

@@ -13,6 +13,34 @@ pub type fsblkcnt_t = ::c_ulonglong;
 pub type fsfilcnt_t = ::c_ulonglong;
 pub type rlim_t = ::c_ulonglong;
 
+impl siginfo_t {
+    pub unsafe fn si_addr(&self) -> *mut ::c_void {
+        #[repr(C)]
+        struct siginfo_sigfault {
+            _si_signo: ::c_int,
+            _si_errno: ::c_int,
+            _si_code: ::c_int,
+            si_addr: *mut ::c_void
+        }
+
+        (*(self as *const siginfo_t as *const siginfo_sigfault)).si_addr
+    }
+
+    pub unsafe fn si_value(&self) -> ::sigval {
+        #[repr(C)]
+        struct siginfo_si_value {
+            _si_signo: ::c_int,
+            _si_errno: ::c_int,
+            _si_code: ::c_int,
+            _si_timerid: ::c_int,
+            _si_overrun: ::c_int,
+            si_value: ::sigval,
+        }
+
+        (*(self as *const siginfo_t as *const siginfo_si_value)).si_value
+    }
+}
+
 s! {
     pub struct aiocb {
         pub aio_fildes: ::c_int,

src/unix/linux_like/mod.rs

@@ -13,6 +13,12 @@ impl ::Clone for timezone {
 }
 
 s! {
+    pub struct _timer {
+        pub si_tid: ::c_int,
+        pub si_overrun: ::c_int,
+        pub si_sigval: ::sigval,
+    }
+
     pub struct in_addr {
         pub s_addr: ::in_addr_t,
     }