From 443b401dacc4f976955c563b5c7aee3bcc467313 Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jeremy@system76.com>
Date: Tue, 1 Jan 2019 09:02:54 -0700
Subject: Add poll and mmap support

---
 src/redox/mod.rs | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/src/redox/mod.rs b/src/redox/mod.rs
index 9f68632a0f..d329514294 100644
--- a/src/redox/mod.rs
+++ b/src/redox/mod.rs
@@ -43,6 +43,16 @@ pub type uid_t = usize;
 pub type suseconds_t = i64;
 
 s! {
+    pub struct fd_set {
+        fds_bits: [::c_ulong; FD_SETSIZE / ULONG_SIZE],
+    }
+
+    pub struct pollfd {
+        pub fd: ::c_int,
+        pub events: ::c_short,
+        pub revents: ::c_short,
+    }
+
     pub struct timeval {
         pub tv_sec: time_t,
         pub tv_usec: suseconds_t,
@@ -64,6 +74,27 @@ pub const STDERR_FILENO: ::c_int = 2;
 pub const EXIT_FAILURE: ::c_int = 1;
 pub const EXIT_SUCCESS: ::c_int = 0;
 
+pub const FD_SETSIZE: usize = 1024;
+
+pub const MAP_SHARED: ::c_int = 1;
+pub const MAP_PRIVATE: ::c_int = 2;
+pub const MAP_ANONYMOUS: ::c_int = 4;
+pub const MAP_ANON: ::c_int = MAP_ANONYMOUS;
+
+pub const MAP_FAILED: *mut ::c_void = !0 as *mut ::c_void;
+
+pub const POLLIN: ::c_short = 0x001;
+pub const POLLPRI: ::c_short = 0x002;
+pub const POLLOUT: ::c_short = 0x004;
+pub const POLLERR: ::c_short = 0x008;
+pub const POLLHUP: ::c_short = 0x010;
+pub const POLLNVAL: ::c_short = 0x020;
+
+pub const PROT_NONE: ::c_int = 0;
+pub const PROT_EXEC: ::c_int = 1;
+pub const PROT_WRITE: ::c_int = 2;
+pub const PROT_READ: ::c_int = 4;
+
 pub const S_ISUID: ::c_int = 0x800;
 pub const S_ISGID: ::c_int = 0x400;
 pub const S_ISVTX: ::c_int = 0x200;
@@ -152,6 +183,18 @@ pub const SIGSYS:    ::c_int = 31;
 pub enum FILE {}
 pub enum fpos_t {} // TODO: fill this out with a struct
 
+
+// intentionally not public, only used for fd_set
+cfg_if! {
+    if #[cfg(target_pointer_width = "32")] {
+        const ULONG_SIZE: usize = 32;
+    } else if #[cfg(target_pointer_width = "64")] {
+        const ULONG_SIZE: usize = 64;
+    } else {
+        // Unknown target_pointer_width
+    }
+}
+
 extern {
     pub fn isalnum(c: c_int) -> c_int;
     pub fn isalpha(c: c_int) -> c_int;
@@ -262,9 +305,20 @@ extern {
     pub fn close(fd: ::c_int) -> ::c_int;
     pub fn fchown(fd: ::c_int, uid: ::uid_t, gid: ::gid_t) -> ::c_int;
     pub fn fcntl(fd: ::c_int, cmd: ::c_int, ...) -> ::c_int;
+    pub fn fsync(fd: ::c_int) -> ::c_int;
     pub fn gethostname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
     pub fn getpid() -> pid_t;
     pub fn memalign(align: ::size_t, size: ::size_t) -> *mut ::c_void;
+    pub fn mmap(addr: *mut ::c_void,
+         len: ::size_t,
+         prot: ::c_int,
+         flags: ::c_int,
+         fd: ::c_int,
+         offset: off_t)
+         -> *mut ::c_void;
+    pub fn mprotect(addr: *mut ::c_void, len: ::size_t, prot: ::c_int)
+                    -> ::c_int;
+    pub fn munmap(addr: *mut ::c_void, len: ::size_t) -> ::c_int;
     pub fn read(fd: ::c_int, buf: *mut ::c_void, count: ::size_t) -> ::ssize_t;
     pub fn setenv(name: *const c_char, val: *const c_char, overwrite: ::c_int)
                   -> ::c_int;
-- 
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