Fix cfg, take &str instead of String

src/backend/libc/net/mod.rs

@@ -8,7 +8,7 @@ pub(crate) mod ext;
     target_os = "wasi"
 )))]
 pub(crate) mod msghdr;
-#[cfg(target_os = "linux")]
+#[cfg(all(target_os = "linux", feature = "alloc"))]
 pub(crate) mod netdevice;
 pub(crate) mod read_sockaddr;
 pub(crate) mod send_recv;

src/backend/libc/net/netdevice.rs

@@ -2,15 +2,17 @@
 
 use crate::backend::io::syscalls::ioctl;
 use crate::fd::AsFd;
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
+#[cfg(all(target_os = "linux", feature = "alloc"))]
+use crate::ffi::CString;
 use crate::io;
 use crate::net::netdevice::open_socket;
 use core::mem::MaybeUninit;
 use core::ptr::{addr_of, addr_of_mut};
 use libc::{c_char, ifreq, IFNAMSIZ, SIOCGIFINDEX, SIOCGIFNAME};
 
-#[cfg(target_os = "linux")]
-pub(crate) fn index_to_name(if_name: String) -> io::Result<u32> {
+#[cfg(all(target_os = "linux", feature = "alloc"))]
+pub(crate) fn index_to_name(if_name: &str) -> io::Result<u32> {
     if if_name.len() >= IFNAMSIZ as usize {
         return Err(io::Errno::NODEV);
     }
@@ -36,7 +38,7 @@ pub(crate) fn index_to_name(if_name: String) -> io::Result<u32> {
     Ok(index as u32)
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(all(target_os = "linux", feature = "alloc"))]
 pub(crate) fn name_to_index(index: u32) -> io::Result<String> {
     let mut uninit_ifreq = MaybeUninit::<ifreq>::uninit();
     let uninit_ifreq_ptr = uninit_ifreq.as_mut_ptr();

src/backend/linux_raw/net/mod.rs

@@ -1,6 +1,6 @@
 pub(crate) mod addr;
 pub(crate) mod msghdr;
-#[cfg(target_os = "linux")]
+#[cfg(all(target_os = "linux", feature = "alloc"))]
 pub(crate) mod netdevice;
 pub(crate) mod read_sockaddr;
 pub(crate) mod send_recv;

src/backend/linux_raw/net/netdevice.rs

@@ -2,17 +2,20 @@
 
 use crate::backend::io::syscalls::ioctl;
 use crate::fd::AsFd;
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
+#[cfg(all(target_os = "linux", feature = "alloc"))]
+use crate::ffi::CString;
 use crate::io;
 use crate::net::netdevice::open_socket;
+use crate::path::Arg;
 use core::mem::MaybeUninit;
 use core::ptr::{addr_of, addr_of_mut};
 use linux_raw_sys::ctypes::c_char;
 use linux_raw_sys::ioctl::{SIOCGIFINDEX, SIOCGIFNAME};
 use linux_raw_sys::net::{ifreq, IFNAMSIZ};
 
-#[cfg(target_os = "linux")]
-pub(crate) fn index_to_name(if_name: String) -> io::Result<u32> {
+#[cfg(all(target_os = "linux", feature = "alloc"))]
+pub(crate) fn index_to_name(if_name: &str) -> io::Result<u32> {
     if if_name.len() >= IFNAMSIZ as usize {
         return Err(io::Errno::NODEV);
     }
@@ -38,7 +41,7 @@ pub(crate) fn index_to_name(if_name: String) -> io::Result<u32> {
     Ok(index as u32)
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(all(target_os = "linux", feature = "alloc"))]
 pub(crate) fn name_to_index(index: u32) -> io::Result<String> {
     let mut uninit_ifreq = MaybeUninit::<ifreq>::uninit();
     let uninit_ifreq_ptr = uninit_ifreq.as_mut_ptr();

src/net/mod.rs

@@ -16,7 +16,8 @@ mod types;
 #[cfg(windows)]
 mod wsa;
 
-#[cfg(target_os = "linux")]
+// Currently limited to feature = "alloc" as it only contains methods requiring alloc at this time.
+#[cfg(all(target_os = "linux", feature = "alloc"))]
 pub mod netdevice;
 pub mod sockopt;
 

src/net/netdevice.rs

@@ -5,13 +5,15 @@
 //!
 //! [Linux]: https://man7.org/linux/man-pages/man7/netdevice.7.html
 
+use crate::fd::OwnedFd;
 use crate::io;
 use crate::io::Errno;
 use crate::net::{socket, AddressFamily, SocketType};
-use std::os::fd::OwnedFd;
 
 /// Creates a socket used to communicate with the kernel in the ioctl calls.
-#[cfg(target_os = "linux")]
+// Currently limited to feature = "alloc" as it is only used by methods
+// requiring alloc at this time.
+#[cfg(all(target_os = "linux", feature = "alloc"))]
 pub(crate) fn open_socket() -> io::Result<OwnedFd> {
     if let Ok(fd) = socket(AddressFamily::UNIX, SocketType::DGRAM, None) {
         Ok(fd)
@@ -24,38 +26,38 @@ pub(crate) fn open_socket() -> io::Result<OwnedFd> {
     }
 }
 
-/// `ioctl(fd, SIOCGIFNAME, ifreq)`—Returns the interface name for a given index.
+/// `ioctl(fd, SIOCGIFINDEX, ifreq)`—Returns the interface index for a given name.
 ///
 /// # References
 ///  - [Linux]
 ///
 /// [Linux]: https://man7.org/linux/man-pages/man7/netdevice.7.html
 #[inline]
-#[doc(alias = "SIOCGIFNAME")]
-#[cfg(target_os = "linux")]
-pub fn name_to_index(index: u32) -> io::Result<String> {
-    crate::backend::net::netdevice::name_to_index(index)
+#[doc(alias = "SIOCGIFINDEX")]
+#[cfg(all(target_os = "linux", feature = "alloc"))]
+pub fn index_to_name(if_name: &str) -> io::Result<u32> {
+    crate::backend::net::netdevice::index_to_name(if_name)
 }
 
-/// `ioctl(fd, SIOCGIFINDEX, ifreq)`—Returns the interface index for a given name.
+/// `ioctl(fd, SIOCGIFNAME, ifreq)`—Returns the interface name for a given index.
 ///
 /// # References
 ///  - [Linux]
 ///
 /// [Linux]: https://man7.org/linux/man-pages/man7/netdevice.7.html
 #[inline]
-#[doc(alias = "SIOCGIFINDEX")]
-#[cfg(target_os = "linux")]
-pub fn index_to_name(if_name: String) -> io::Result<u32> {
-    crate::backend::net::netdevice::index_to_name(if_name)
+#[doc(alias = "SIOCGIFNAME")]
+#[cfg(all(target_os = "linux", feature = "alloc"))]
+pub fn name_to_index(index: u32) -> io::Result<String> {
+    crate::backend::net::netdevice::name_to_index(index)
 }
 
 #[cfg(test)]
 mod tests {
     use crate::backend::net::netdevice::{index_to_name, name_to_index};
 
     #[test]
-    #[cfg(target_os = "linux")]
+    #[cfg(all(target_os = "linux", feature = "alloc"))]
     fn test_index_to_name() {
         let loopback_index = std::fs::read_to_string("/sys/class/net/lo/ifindex")
             .unwrap()
@@ -64,11 +66,11 @@ mod tests {
             .0
             .parse::<u32>()
             .unwrap();
-        assert_eq!(Ok(loopback_index), index_to_name("lo".to_owned()));
+        assert_eq!(Ok(loopback_index), index_to_name("lo"));
     }
 
     #[test]
-    #[cfg(target_os = "linux")]
+    #[cfg(all(target_os = "linux", feature = "alloc"))]
     fn test_name_to_index() {
         let loopback_index = std::fs::read_to_string("/sys/class/net/lo/ifindex")
             .unwrap()