Move a few bindings behind features

3 files changed, 7 insertions, 4 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 75f67c72..69a06632 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,8 @@ exclude     = [
 [features]
 eventfd = []
 execvpe = []
+preadv_pwritev = []
+signalfd = []
 
 [dependencies]
 libc     = "0.1.10"
diff --git a/src/sys/mod.rs b/src/sys/mod.rs
index 61c8d688..aee1257d 100644
--- a/src/sys/mod.rs
+++ b/src/sys/mod.rs
@@ -18,6 +18,7 @@ pub mod ioctl;
 pub mod signal;
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg(feature = "signalfd")]
 pub mod signalfd;
 
 pub mod socket;
diff --git a/src/sys/uio.rs b/src/sys/uio.rs
index bb944641..b43ede3c 100644
--- a/src/sys/uio.rs
+++ b/src/sys/uio.rs
@@ -23,13 +23,13 @@ mod ffi {
 
         // vectorized write at a specified offset
         // doc: http://man7.org/linux/man-pages/man2/pwritev.2.html
-        #[cfg(target_os = "linux")]
+        #[cfg(feature = "preadv_pwritev")]
         pub fn pwritev(fd: RawFd, iov: *const IoVec<&[u8]>, iovcnt: c_int,
                        offset: off_t) -> ssize_t;
 
         // vectorized read at a specified offset
         // doc: http://man7.org/linux/man-pages/man2/preadv.2.html
-        #[cfg(target_os = "linux")]
+        #[cfg(feature = "preadv_pwritev")]
         pub fn preadv(fd: RawFd, iov: *const IoVec<&mut [u8]>, iovcnt: c_int,
                       offset: off_t) -> ssize_t;
 
@@ -64,7 +64,7 @@ pub fn readv(fd: RawFd, iov: &mut [IoVec<&mut [u8]>]) -> Result<usize> {
     return Ok(res as usize)
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(feature = "preadv_pwritev")]
 pub fn pwritev(fd: RawFd, iov: &[IoVec<&[u8]>],
                offset: off_t) -> Result<usize> {
     let res = unsafe {
@@ -77,7 +77,7 @@ pub fn pwritev(fd: RawFd, iov: &[IoVec<&[u8]>],
     }
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(feature = "preadv_pwritev")]
 pub fn preadv(fd: RawFd, iov: &mut [IoVec<&mut [u8]>],
               offset: off_t) -> Result<usize> {
     let res = unsafe {