Change impl trait arguments to explicit generic parameters. (#1283)

As discussed [here], use generic parameters instead of impl trait
argumentst.

[here]: #753 (comment)

src/event/epoll.rs

@@ -123,9 +123,9 @@ pub fn create(flags: epoll::CreateFlags) -> io::Result<OwnedFd> {
 /// [faq]: https://man7.org/linux/man-pages/man7/epoll.7.html#:~:text=Will%20closing%20a%20file%20descriptor%20cause%20it%20to%20be%20removed%20from%20all%0A%20%20%20%20%20%20%20%20%20%20epoll%20interest%20lists%3F
 #[doc(alias = "epoll_ctl")]
 #[inline]
-pub fn add(
-    epoll: impl AsFd,
-    source: impl AsFd,
+pub fn add<EpollFd: AsFd, SourceFd: AsFd>(
+    epoll: EpollFd,
+    source: SourceFd,
     data: epoll::EventData,
     event_flags: epoll::EventFlags,
 ) -> io::Result<()> {
@@ -154,9 +154,9 @@ pub fn add(
 /// [illumos]: https://www.illumos.org/man/3C/epoll_ctl
 #[doc(alias = "epoll_ctl")]
 #[inline]
-pub fn modify(
-    epoll: impl AsFd,
-    source: impl AsFd,
+pub fn modify<EpollFd: AsFd, SourceFd: AsFd>(
+    epoll: EpollFd,
+    source: SourceFd,
     data: epoll::EventData,
     event_flags: epoll::EventFlags,
 ) -> io::Result<()> {
@@ -183,7 +183,7 @@ pub fn modify(
 /// [illumos]: https://www.illumos.org/man/3C/epoll_ctl
 #[doc(alias = "epoll_ctl")]
 #[inline]
-pub fn delete(epoll: impl AsFd, source: impl AsFd) -> io::Result<()> {
+pub fn delete<EpollFd: AsFd, SourceFd: AsFd>(epoll: EpollFd, source: SourceFd) -> io::Result<()> {
     syscalls::epoll_del(epoll.as_fd(), source.as_fd())
 }
 
@@ -202,7 +202,11 @@ pub fn delete(epoll: impl AsFd, source: impl AsFd) -> io::Result<()> {
 #[cfg(feature = "alloc")]
 #[cfg_attr(docsrs, doc(cfg(feature = "alloc"), alias = "epoll_wait"))]
 #[inline]
-pub fn wait(epoll: impl AsFd, event_list: &mut EventVec, timeout: c::c_int) -> io::Result<()> {
+pub fn wait<EpollFd: AsFd>(
+    epoll: EpollFd,
+    event_list: &mut EventVec,
+    timeout: c::c_int,
+) -> io::Result<()> {
     // SAFETY: We're calling `epoll_wait` via FFI and we know how it
     // behaves.
     unsafe {

src/event/kqueue.rs

@@ -415,8 +415,8 @@ pub fn kqueue() -> io::Result<OwnedFd> {
 /// [OpenBSD]: https://man.openbsd.org/kevent.2
 /// [NetBSD]: https://man.netbsd.org/kevent.2
 /// [DragonFly BSD]: https://man.dragonflybsd.org/?command=kevent&section=2
-pub unsafe fn kevent(
-    kqueue: impl AsFd,
+pub unsafe fn kevent<Fd: AsFd>(
+    kqueue: Fd,
     changelist: &[Event],
     eventlist: &mut Vec<Event>,
     timeout: Option<Duration>,

src/event/port.rs

@@ -58,9 +58,9 @@ pub fn port_create() -> io::Result<OwnedFd> {
 ///
 /// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_associate/
 /// [illumos]: https://illumos.org/man/3C/port_associate
-pub unsafe fn port_associate_fd(
-    port: impl AsFd,
-    object: impl AsRawFd,
+pub unsafe fn port_associate_fd<Fd: AsFd, RawFd: AsRawFd>(
+    port: Fd,
+    object: RawFd,
     events: PollFlags,
     userdata: *mut ffi::c_void,
 ) -> io::Result<()> {
@@ -87,7 +87,10 @@ pub unsafe fn port_associate_fd(
 ///
 /// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_dissociate
 /// [illumos]: https://illumos.org/man/3C/port_dissociate
-pub unsafe fn port_dissociate_fd(port: impl AsFd, object: impl AsRawFd) -> io::Result<()> {
+pub unsafe fn port_dissociate_fd<Fd: AsFd, RawFd: AsRawFd>(
+    port: Fd,
+    object: RawFd,
+) -> io::Result<()> {
     syscalls::port_dissociate(port.as_fd(), c::PORT_SOURCE_FD, object.as_raw_fd() as _)
 }
 
@@ -99,7 +102,7 @@ pub unsafe fn port_dissociate_fd(port: impl AsFd, object: impl AsRawFd) -> io::R
 ///
 /// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_get/
 /// [illumos]: https://illumos.org/man/3C/port_get
-pub fn port_get(port: impl AsFd, timeout: Option<Duration>) -> io::Result<Event> {
+pub fn port_get<Fd: AsFd>(port: Fd, timeout: Option<Duration>) -> io::Result<Event> {
     let mut timeout = timeout.map(|timeout| c::timespec {
         tv_sec: timeout.as_secs().try_into().unwrap(),
         tv_nsec: timeout.subsec_nanos() as _,
@@ -125,8 +128,8 @@ pub fn port_get(port: impl AsFd, timeout: Option<Duration>) -> io::Result<Event>
 /// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_getn/
 /// [illumos]: https://illumos.org/man/3C/port_getn
 #[cfg(feature = "alloc")]
-pub fn port_getn(
-    port: impl AsFd,
+pub fn port_getn<Fd: AsFd>(
+    port: Fd,
     events: &mut Vec<Event>,
     min_events: usize,
     timeout: Option<Duration>,
@@ -157,7 +160,7 @@ pub fn port_getn(
 ///
 /// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_getn/
 /// [illumos]: https://illumos.org/man/3C/port_getn
-pub fn port_getn_query(port: impl AsFd) -> io::Result<u32> {
+pub fn port_getn_query<Fd: AsFd>(port: Fd) -> io::Result<u32> {
     syscalls::port_getn_query(port.as_fd())
 }
 
@@ -169,6 +172,6 @@ pub fn port_getn_query(port: impl AsFd) -> io::Result<u32> {
 ///
 /// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_send/
 /// [illumos]: https://illumos.org/man/3C/port_send
-pub fn port_send(port: impl AsFd, events: i32, userdata: *mut ffi::c_void) -> io::Result<()> {
+pub fn port_send<Fd: AsFd>(port: Fd, events: i32, userdata: *mut ffi::c_void) -> io::Result<()> {
     syscalls::port_send(port.as_fd(), events, userdata.cast())
 }

src/fs/inotify.rs

@@ -71,8 +71,8 @@ pub fn init(flags: inotify::CreateFlags) -> io::Result<OwnedFd> {
 /// application should keep track of this externally to avoid logic errors.
 #[doc(alias = "inotify_add_watch")]
 #[inline]
-pub fn add_watch<P: crate::path::Arg>(
-    inot: impl AsFd,
+pub fn add_watch<P: crate::path::Arg, Fd: AsFd>(
+    inot: Fd,
     path: P,
     flags: inotify::WatchFlags,
 ) -> io::Result<i32> {
@@ -85,7 +85,7 @@ pub fn add_watch<P: crate::path::Arg>(
 /// [`inotify::add_watch`] and not previously have been removed.
 #[doc(alias = "inotify_rm_watch")]
 #[inline]
-pub fn remove_watch(inot: impl AsFd, wd: i32) -> io::Result<()> {
+pub fn remove_watch<Fd: AsFd>(inot: Fd, wd: i32) -> io::Result<()> {
     syscalls::inotify_rm_watch(inot.as_fd(), wd)
 }
 

src/net/netdevice.rs

@@ -33,7 +33,7 @@ use alloc::string::String;
 /// [Linux]: https://man7.org/linux/man-pages/man7/netdevice.7.html
 #[inline]
 #[doc(alias = "SIOCGIFINDEX")]
-pub fn name_to_index(fd: impl AsFd, if_name: &str) -> io::Result<u32> {
+pub fn name_to_index<Fd: AsFd>(fd: Fd, if_name: &str) -> io::Result<u32> {
     crate::backend::net::netdevice::name_to_index(fd, if_name)
 }
 
@@ -50,7 +50,7 @@ pub fn name_to_index(fd: impl AsFd, if_name: &str) -> io::Result<u32> {
 #[inline]
 #[doc(alias = "SIOCGIFNAME")]
 #[cfg(feature = "alloc")]
-pub fn index_to_name(fd: impl AsFd, index: u32) -> io::Result<String> {
+pub fn index_to_name<Fd: AsFd>(fd: Fd, index: u32) -> io::Result<String> {
     crate::backend::net::netdevice::index_to_name(fd, index)
 }
 

src/net/send_recv/msg.rs

@@ -617,8 +617,8 @@ impl FusedIterator for AncillaryDrain<'_> {}
 /// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
 /// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
 #[inline]
-pub fn sendmsg(
-    socket: impl AsFd,
+pub fn sendmsg<Fd: AsFd>(
+    socket: Fd,
     iov: &[IoSlice<'_>],
     control: &mut SendAncillaryBuffer<'_, '_, '_>,
     flags: SendFlags,
@@ -647,8 +647,8 @@ pub fn sendmsg(
 /// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
 /// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
 #[inline]
-pub fn sendmsg_v4(
-    socket: impl AsFd,
+pub fn sendmsg_v4<Fd: AsFd>(
+    socket: Fd,
     addr: &SocketAddrV4,
     iov: &[IoSlice<'_>],
     control: &mut SendAncillaryBuffer<'_, '_, '_>,
@@ -678,8 +678,8 @@ pub fn sendmsg_v4(
 /// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
 /// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
 #[inline]
-pub fn sendmsg_v6(
-    socket: impl AsFd,
+pub fn sendmsg_v6<Fd: AsFd>(
+    socket: Fd,
     addr: &SocketAddrV6,
     iov: &[IoSlice<'_>],
     control: &mut SendAncillaryBuffer<'_, '_, '_>,
@@ -711,8 +711,8 @@ pub fn sendmsg_v6(
 /// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
 #[inline]
 #[cfg(unix)]
-pub fn sendmsg_unix(
-    socket: impl AsFd,
+pub fn sendmsg_unix<Fd: AsFd>(
+    socket: Fd,
     addr: &super::SocketAddrUnix,
     iov: &[IoSlice<'_>],
     control: &mut SendAncillaryBuffer<'_, '_, '_>,
@@ -729,8 +729,8 @@ pub fn sendmsg_unix(
 /// [Linux]: https://man7.org/linux/man-pages/man2/sendmsg.2.html
 #[inline]
 #[cfg(target_os = "linux")]
-pub fn sendmsg_xdp(
-    socket: impl AsFd,
+pub fn sendmsg_xdp<Fd: AsFd>(
+    socket: Fd,
     addr: &super::SocketAddrXdp,
     iov: &[IoSlice<'_>],
     control: &mut SendAncillaryBuffer<'_, '_, '_>,
@@ -760,8 +760,8 @@ pub fn sendmsg_xdp(
 /// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
 /// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
 #[inline]
-pub fn sendmsg_any(
-    socket: impl AsFd,
+pub fn sendmsg_any<Fd: AsFd>(
+    socket: Fd,
     addr: Option<&SocketAddrAny>,
     iov: &[IoSlice<'_>],
     control: &mut SendAncillaryBuffer<'_, '_, '_>,
@@ -807,8 +807,8 @@ pub fn sendmsg_any(
 /// [DragonFly BSD]: https://man.dragonflybsd.org/?command=recvmsg&section=2
 /// [illumos]: https://illumos.org/man/3SOCKET/recvmsg
 #[inline]
-pub fn recvmsg(
-    socket: impl AsFd,
+pub fn recvmsg<Fd: AsFd>(
+    socket: Fd,
     iov: &mut [IoSliceMut<'_>],
     control: &mut RecvAncillaryBuffer<'_>,
     flags: RecvFlags,

src/process/prctl.rs

@@ -1091,8 +1091,10 @@ const PR_PAC_SET_ENABLED_KEYS: c_int = 60;
 /// [`prctl(PR_PAC_SET_ENABLED_KEYS,…)`]: https://www.kernel.org/doc/html/v6.10/arch/arm64/pointer-authentication.html
 #[inline]
 #[doc(alias = "PR_PAC_SET_ENABLED_KEYS")]
-pub unsafe fn configure_pointer_authentication_keys(
-    config: impl Iterator<Item = (PointerAuthenticationKeys, bool)>,
+pub unsafe fn configure_pointer_authentication_keys<
+    Config: Iterator<Item = (PointerAuthenticationKeys, bool)>,
+>(
+    config: Config,
 ) -> io::Result<()> {
     let mut affected_keys: u32 = 0;
     let mut enabled_keys: u32 = 0;

src/process/wait.rs

@@ -361,8 +361,8 @@ pub fn wait(waitopts: WaitOptions) -> io::Result<Option<(Pid, WaitStatus)>> {
 /// state.
 #[cfg(not(any(target_os = "openbsd", target_os = "redox", target_os = "wasi")))]
 #[inline]
-pub fn waitid<'a>(
-    id: impl Into<WaitId<'a>>,
+pub fn waitid<'a, Id: Into<WaitId<'a>>>(
+    id: Id,
     options: WaitIdOptions,
 ) -> io::Result<Option<WaitIdStatus>> {
     backend::process::syscalls::waitid(id.into(), options)