Merge branch 'jD91mZM2/epoll' into 'epoll'

Add completely untested redox epoll implementation

See merge request redox-os/relibc!211

src/header/poll/mod.rs

@@ -54,6 +54,7 @@ pub fn poll_epoll(fds: &mut [pollfd], timeout: c_int) -> c_int {
             data: epoll_data {
                 u64: i as u64,
             },
+            ..Default::default()
         };
 
         for (p, ep) in event_map.iter() {

src/header/sys_epoll/linux.rs

 use platform::types::*;
 
 pub const EPOLL_CLOEXEC: c_int = 0x8_0000;
+
+pub const EPOLLIN: c_uint = 0x001;
+pub const EPOLLPRI: c_uint = 0x002;
+pub const EPOLLOUT: c_uint = 0x004;
+pub const EPOLLRDNORM: c_uint = 0x040;
+pub const EPOLLNVAL: c_uint = 0x020;
+pub const EPOLLRDBAND: c_uint = 0x080;
+pub const EPOLLWRNORM: c_uint = 0x100;
+pub const EPOLLWRBAND: c_uint = 0x200;
+pub const EPOLLMSG: c_uint = 0x400;
+pub const EPOLLERR: c_uint = 0x008;
+pub const EPOLLHUP: c_uint = 0x010;
+pub const EPOLLRDHUP: c_uint = 0x2000;
+pub const EPOLLEXCLUSIVE: c_uint = 1 << 28;
+pub const EPOLLWAKEUP: c_uint = 1 << 29;
+pub const EPOLLONESHOT: c_uint = 1 << 30;
+pub const EPOLLET: c_uint = 1 << 31;

src/header/sys_epoll/mod.rs

@@ -20,31 +20,32 @@ pub const EPOLL_CTL_ADD: c_int = 1;
 pub const EPOLL_CTL_DEL: c_int = 2;
 pub const EPOLL_CTL_MOD: c_int = 3;
 
-pub const EPOLLIN: u32 =     0x0001;
-pub const EPOLLPRI: u32 =    0x0002;
-pub const EPOLLOUT: u32 =    0x0004;
-pub const EPOLLERR: u32 =    0x0008;
-pub const EPOLLHUP: u32 =    0x0010;
-pub const EPOLLNVAL: u32 =   0x0020;
-pub const EPOLLRDNORM: u32 = 0x0040;
-pub const EPOLLRDBAND: u32 = 0x0080;
-pub const EPOLLWRNORM: u32 = 0x0100;
-pub const EPOLLWRBAND: u32 = 0x0200;
-pub const EPOLLMSG: u32 =    0x0400;
-pub const EPOLLRDHUP: u32 =  0x2000;
-
 #[repr(C)]
+#[derive(Clone, Copy)]
 pub union epoll_data {
     pub ptr: *mut c_void,
     pub fd: c_int,
     pub u32: u32,
     pub u64: u64,
 }
+impl Default for epoll_data {
+    fn default() -> Self {
+        Self { u64: 0 }
+    }
+}
 
 #[repr(C)]
+#[derive(Clone, Copy, Default)]
+// This will match in size with syscall::Event (24 bytes on 64-bit
+// systems) on redox. The `Default` trait is here so we don't need to
+// worry about the padding when using this type.
 pub struct epoll_event {
-    pub events: u32,
-    pub data: epoll_data,
+    pub events: u32, // 4 bytes
+    // 4 automatic alignment bytes
+    pub data: epoll_data, // 8 bytes
+
+    #[cfg(target_os = "redox")]
+    pub _pad: u64, // 8 bytes
 }
 
 #[no_mangle]

src/header/sys_epoll/redox.rs

+use syscall::flag::{EVENT_READ, EVENT_WRITE};
+use header::fcntl::O_CLOEXEC;
 use platform::types::*;
 
-pub const EPOLL_CLOEXEC: c_int = 0x0100_0000;
+pub const EPOLL_CLOEXEC: c_int = O_CLOEXEC;
+
+pub const EPOLLIN: c_uint = EVENT_READ as c_uint;
+pub const EPOLLPRI: c_uint = 0;
+pub const EPOLLOUT: c_uint = EVENT_WRITE as c_uint;
+pub const EPOLLRDNORM: c_uint = 0;
+pub const EPOLLNVAL: c_uint = 0;
+pub const EPOLLRDBAND: c_uint = 0;
+pub const EPOLLWRNORM: c_uint = 0;
+pub const EPOLLWRBAND: c_uint = 0;
+pub const EPOLLMSG: c_uint = 0;
+pub const EPOLLERR: c_uint = 0;
+pub const EPOLLHUP: c_uint = 0;
+pub const EPOLLRDHUP: c_uint = 0;
+pub const EPOLLEXCLUSIVE: c_uint = 0;
+pub const EPOLLWAKEUP: c_uint = 0;
+pub const EPOLLONESHOT: c_uint = 0;
+pub const EPOLLET: c_uint = 0;

src/header/sys_select/mod.rs

@@ -80,6 +80,7 @@ pub fn select_epoll(
                     data: epoll_data {
                         fd: fd,
                     },
+                    ..Default::default()
                 };
                 if epoll_ctl(*ep, EPOLL_CTL_ADD, fd, &mut event) < 0 {
                     return -1;
@@ -93,6 +94,7 @@ pub fn select_epoll(
                     data: epoll_data {
                         fd: fd,
                     },
+                    ..Default::default()
                 };
                 if epoll_ctl(*ep, EPOLL_CTL_ADD, fd, &mut event) < 0 {
                     return -1;
@@ -106,6 +108,7 @@ pub fn select_epoll(
                     data: epoll_data {
                         fd: fd,
                     },
+                    ..Default::default()
                 };
                 if epoll_ctl(*ep, EPOLL_CTL_ADD, fd, &mut event) < 0 {
                     return -1;

src/platform/redox/epoll.rs

+use super::super::types::*;
+use super::super::{Pal, PalEpoll};
+use super::Sys;
+
+use c_str::CStr;
+use core::{mem, slice};
+use fs::File;
+use io::prelude::*;
+use header::errno::*;
+use header::fcntl::*;
+use header::signal::sigset_t;
+use header::sys_epoll::*;
+use syscall::data::{Event, TimeSpec};
+use syscall::flag::EVENT_READ;
+
+impl PalEpoll for Sys {
+    fn epoll_create1(flags: c_int) -> c_int {
+        Sys::open(
+            CStr::from_bytes_with_nul(b"event:\0").unwrap(),
+            O_RDWR | flags,
+            0
+        )
+    }
+
+    fn epoll_ctl(epfd: c_int, op: c_int, fd: c_int, event: *mut epoll_event) -> c_int {
+        Sys::write(epfd, &Event {
+            id: fd as usize,
+            flags: unsafe { (*event).events as usize },
+
+            // NOTE: Danger when using non 64-bit systems. If this is
+            // needed, use a box or something
+            data: unsafe { mem::transmute((*event).data) }
+        }) as c_int
+    }
+
+    fn epoll_pwait(epfd: c_int, mut events: *mut epoll_event, maxevents: c_int, timeout: c_int, _sigset: *const sigset_t) -> c_int {
+        // TODO: sigset
+
+        let _timer;
+        if timeout != -1 {
+            _timer = File::open(CStr::from_bytes_with_nul(b"time:\0").unwrap(), O_RDWR);
+            match _timer {
+                Err(_) => return -1,
+                Ok(mut timer) => {
+                    let mut time = TimeSpec::default();
+                    if let Err(err) = timer.read(&mut time) {
+                        return -1;
+                    }
+                    time.tv_nsec += timeout;
+                    if let Err(err) = timer.write(&time) {
+                        return -1;
+                    }
+
+                    if Sys::write(epfd, &Event {
+                        id: timer.fd as usize,
+                        flags: EVENT_READ,
+                        data: 0
+                    }) == -1 {
+                        return -1;
+                    }
+                }
+            }
+        }
+
+        let bytes_read = Sys::read(epfd, unsafe { slice::from_raw_parts_mut(
+            events as *mut u8,
+            maxevents as usize
+        ) });
+        if bytes_read == -1 {
+            return -1;
+        }
+        let read = bytes_read as usize / mem::size_of::<Event>();
+
+        for i in 0..maxevents {
+            unsafe {
+                let event = *(events as *mut Event);
+                if event.data == 0 {
+                    return EINTR;
+                }
+                *events = epoll_event {
+                    events: event.flags as _,
+                    data: mem::transmute(event.data),
+                    ..Default::default()
+                };
+                events = events.add(mem::size_of::<epoll_event>());
+            }
+        }
+
+        read as c_int
+    }
+}

src/platform/redox/mod.rs

 //! sys/socket implementation, following http://pubs.opengroup.org/onlinepubs/009696699/basedefs/sys/socket.h.html
 
-use cbitset::BitSet;
 use core::result::Result as CoreResult;
 use core::{mem, ptr, slice};
 use syscall::data::Map;
@@ -27,6 +26,7 @@ use io::{self, BufReader, SeekFrom};
 use super::types::*;
 use super::{errno, Pal, Read};
 
+mod epoll;
 mod extra;
 mod signal;
 mod socket;