fix: resolve 6 compilation errors from patch absorption

- fcntl/mod.rs: Remove misplaced F_DUPFD_CLOEXEC fallback code from
  inside the flock struct definition (bad patch merge artifact)
- fcntl/mod.rs: Remove unused 'close' import
- signal/mod.rs: Remove duplicate 'mod signalfd' declaration
- pthread/mod.rs: Add Pal+Sys imports for sched_yield() in pthread_yield
- time/mod.rs: Remove duplicate From<&TimeSpec> impl (already in
  bits_timespec/mod.rs)
- pthread/mod.rs: Add FINISHED flag to PthreadFlags and set it on
  thread exit (referenced by pthread_kill in signal/mod.rs)

src/header/fcntl/mod.rs

@@ -7,7 +7,6 @@ use core::num::NonZeroU64;
 use crate::{
     c_str::CStr,
     error::ResultExt,
-    header::unistd::close,
     platform::{
         Pal, Sys,
         types::{c_char, c_int, c_short, c_ulonglong, mode_t, off_t, pid_t},
@@ -74,23 +73,6 @@ pub struct flock {
     /// Type of lock; `F_RDLCK`, `F_WRLCK`, `F_UNLCK`.
     pub l_type: c_short,
     /// Flag for starting offset.
-
-    if cmd == F_DUPFD_CLOEXEC {
-        let new_fd = Sys::fcntl(fildes, F_DUPFD_CLOEXEC, arg).or_minus_one_errno();
-        if new_fd >= 0 {
-            return new_fd;
-        }
-
-        let new_fd = Sys::fcntl(fildes, F_DUPFD, arg).or_minus_one_errno();
-        if new_fd < 0 {
-            return -1;
-        }
-        if Sys::fcntl(new_fd, F_SETFD, FD_CLOEXEC as c_ulonglong).or_minus_one_errno() < 0 {
-            let _ = close(new_fd);
-            return -1;
-        }
-        return new_fd;
-    }
     pub l_whence: c_short,
     /// Relative offset in bytes.
     pub l_start: off_t,

src/header/pthread/mod.rs

@@ -8,11 +8,11 @@ use core::{cell::Cell, ptr::NonNull};
 use crate::{
     error::Errno,
     header::{sched::sched_param, time::timespec},
-    platform::types::{
+    platform::{Pal, Sys, types::{
         c_int, c_uchar, c_uint, c_void, clockid_t, pthread_attr_t, pthread_barrier_t,
         pthread_barrierattr_t, pthread_key_t, pthread_mutex_t, pthread_mutexattr_t, pthread_once_t,
         pthread_rwlock_t, pthread_rwlockattr_t, pthread_t, size_t,
-    },
+    }},
     pthread,
 };
 

src/header/signal/mod.rs

@@ -40,9 +40,6 @@ pub mod sys;
 mod signalfd;
 pub use self::signalfd::*;
 
-mod signalfd;
-pub use self::signalfd::*;
-
 type SigSet = BitSet<[u64; 1]>;
 
 /// cbindgen:ignore

src/header/time/mod.rs

@@ -50,16 +50,6 @@ pub(crate) const NANOSECONDS: c_long = 1_000_000_000;
 /// cbindgen:ignore
 const UTC_STR: &core::ffi::CStr = c"UTC";
 
-#[cfg(target_os = "redox")]
-impl<'a> From<&'a syscall::TimeSpec> for timespec {
-    fn from(tp: &syscall::TimeSpec) -> Self {
-        Self {
-            tv_sec: tp.tv_sec as _,
-            tv_nsec: tp.tv_nsec as _,
-        }
-    }
-}
-
 /// timer_t internal data, ABI unstable
 #[repr(C)]
 #[derive(Clone)]

src/pthread/mod.rs

@@ -66,6 +66,7 @@ pub unsafe fn terminate_from_main_thread() {
 bitflags::bitflags! {
     pub struct PthreadFlags: usize {
         const DETACHED = 1;
+        const FINISHED = 2;
     }
 }
 
@@ -316,6 +317,9 @@ pub unsafe fn exit_current_thread(retval: Retval) -> ! {
         thread_fd.dup_into_upper(b"status").unwrap()
     };
 
+    this.flags
+        .fetch_or(PthreadFlags::FINISHED.bits(), Ordering::AcqRel);
+
     if this.flags.load(Ordering::Acquire) & PthreadFlags::DETACHED.bits() != 0 {
         // When detached, the thread state no longer makes any sense, and can immediately be
         // deallocated.