fs/streams: Move the file streams from the group structure into TLS

This is preparation for flushing streams from user space, like it should
be done.

- Move tg_streamlist (group, kernel space) ->
       ta_streamlist (TLS, user space)
- Access stream list via tg_info in kernel
- Access stream list via TLS in user space
- Remove / rename nxsched_get_streams -> lib_getstreams
- Remove system call for nxsched_get_streams

include/nuttx/lib/lib.h

@@ -107,7 +107,12 @@ extern "C"
 struct task_group_s;
 void lib_stream_initialize(FAR struct task_group_s *group);
 void lib_stream_release(FAR struct task_group_s *group);
-#endif
+
+/* Functions contained in lib_getstreams.c **********************************/
+
+struct streamlist;
+FAR struct streamlist *lib_get_streams(void);
+#endif /* CONFIG_FILE_STREAM */
 
 /* Functions defined in lib_srand.c *****************************************/
 

include/nuttx/sched.h

@@ -495,21 +495,6 @@ struct task_group_s
 
   struct filelist tg_filelist;      /* Maps file descriptor to file         */
 
-#ifdef CONFIG_FILE_STREAM
-  /* FILE streams ***********************************************************/
-
-  /* In a flat, single-heap build.  The stream list is allocated with this
-   * structure.  But kernel mode with a kernel allocator,
-  * it must be separately allocated using a user-space allocator.
-   */
-
-#ifdef CONFIG_MM_KERNEL_HEAP
-  FAR struct streamlist *tg_streamlist;
-#else
-  struct streamlist tg_streamlist;  /* Holds C buffered I/O info            */
-#endif
-#endif
-
 #ifdef CONFIG_ARCH_ADDRENV
   /* Address Environment ****************************************************/
 
@@ -841,9 +826,6 @@ int nxsched_release_tcb(FAR struct tcb_s *tcb, uint8_t ttype);
  */
 
 FAR struct filelist *nxsched_get_files(void);
-#ifdef CONFIG_FILE_STREAM
-FAR struct streamlist *nxsched_get_streams(void);
-#endif /* CONFIG_FILE_STREAM */
 
 /****************************************************************************
  * Name: nxtask_init

include/nuttx/tls.h

@@ -29,6 +29,7 @@
 
 #include <nuttx/arch.h>
 #include <nuttx/atexit.h>
+#include <nuttx/fs/fs.h>
 
 #include <sys/types.h>
 #include <pthread.h>
@@ -146,6 +147,9 @@ struct task_info_s
 #if CONFIG_LIBC_MAX_EXITFUNS > 0
   struct atexit_list_s ta_exit; /* Exit functions */
 #endif
+#ifdef CONFIG_FILE_STREAM
+  struct streamlist ta_streamlist; /* Holds C buffered I/O info */
+#endif
 };
 
 /* struct pthread_cleanup_s *************************************************/

include/stdio.h

@@ -32,7 +32,7 @@
 #include <time.h>
 
 #include <nuttx/fs/fs.h>
-#include <nuttx/sched.h>
+#include <nuttx/lib/lib.h>
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -63,9 +63,9 @@
 
 /* The first three _iob entries are reserved for standard I/O */
 
-#define stdin      (&nxsched_get_streams()->sl_std[0])
-#define stdout     (&nxsched_get_streams()->sl_std[1])
-#define stderr     (&nxsched_get_streams()->sl_std[2])
+#define stdin      (&lib_get_streams()->sl_std[0])
+#define stdout     (&lib_get_streams()->sl_std[1])
+#define stderr     (&lib_get_streams()->sl_std[2])
 
 /* Path to the directory where temporary files can be created */
 

include/sys/syscall_lookup.h

@@ -268,7 +268,6 @@ SYSCALL_LOOKUP(futimens,                   2)
 
 #ifdef CONFIG_FILE_STREAM
   SYSCALL_LOOKUP(fs_fdopen,                4)
-  SYSCALL_LOOKUP(nxsched_get_streams,      0)
 #endif
 
 #ifndef CONFIG_DISABLE_MOUNTPOINT