input: rename input_{start,stop}_stdin()

- "stdin" is misleading because it may read from stdout or stderr
- also remove some unused includes

src/nvim/main.c

@@ -279,7 +279,7 @@ int main(int argc, char **argv)
       // read the "-" file (eg: cat file | nvim -)
       fd = params.err_isatty ? fileno(stderr) : fileno(stdout);
     }
-    input_start_stdin(fd);
+    input_start(fd);
   }
 
   // open terminals when opening files that start with term://
@@ -386,8 +386,8 @@ int main(int argc, char **argv)
   }
 
   if (!params.headless) {
-    // Stop reading from stdin, the UI layer will take over now
-    input_stop_stdin();
+    // Stop reading from input stream, the UI layer will take over now.
+    input_stop();
     ui_builtin_start();
   }
 

src/nvim/os/event.c

@@ -73,7 +73,7 @@ void event_teardown(void)
   // is required because the `process_events_from` above may call `event_push`
   // which will set the stop_flag to 1(uv_stop)
   uv_default_loop()->stop_flag = 0;
-  input_stop_stdin();
+  input_stop();
   channel_teardown();
   job_teardown();
   server_teardown();

src/nvim/os/input.c

@@ -1,6 +1,5 @@
 #include <assert.h>
 #include <string.h>
-#include <stdint.h>
 #include <stdbool.h>
 
 #include <uv.h>
@@ -8,7 +7,6 @@
 #include "nvim/api/private/defs.h"
 #include "nvim/os/input.h"
 #include "nvim/os/event.h"
-#include "nvim/os/os.h"
 #include "nvim/os/rstream_defs.h"
 #include "nvim/os/rstream.h"
 #include "nvim/ascii.h"
@@ -54,7 +52,7 @@ int input_global_fd(void)
   return global_fd;
 }
 
-void input_start_stdin(int fd)
+void input_start(int fd)
 {
   if (read_stream) {
     return;
@@ -67,7 +65,7 @@ void input_start_stdin(int fd)
   rstream_start(read_stream);
 }
 
-void input_stop_stdin(void)
+void input_stop(void)
 {
   if (!read_stream) {
     return;