[libc] Update libc.

1. Add POSIX termios implementation;
2. Add POSIX signals implementation;
3. Add stdio for each libc.

components/libc/compilers/newlib/libc.c

@@ -1,52 +1,60 @@
+/*
+ * File     : libc.c
+ * Brief    : gcc libc header file
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
 #include <rtthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
 #include <sys/time.h>
+
 #include "libc.h"
 
 #ifdef RT_USING_PTHREADS
 #include <pthread.h>
 #endif
 
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-
-#ifdef RT_USING_DFS_DEVFS
-#include <devfs.h>
-#endif
-
-#endif
-
 int libc_system_init(void)
 {
 #ifdef RT_USING_DFS
-    int fd;
-    struct rt_device *console_dev;
+    rt_device_t dev_console;
 
-#ifndef RT_USING_DFS_DEVFS
-#error Please enable devfs by defining RT_USING_DFS_DEVFS in rtconfig.h
-#endif
-
-    console_dev = rt_console_get_device();
-    if (console_dev)
+    dev_console = rt_console_get_device();
+    if (dev_console)
     {
-        /* initialize console device */
-        rt_console_init(console_dev->parent.name);
-
-        /* open console as stdin/stdout/stderr */
-        fd = open("/dev/console", O_RDONLY, 0); /* for stdin */
-        fd = open("/dev/console", O_WRONLY, 0); /* for stdout */
-        fd = open("/dev/console", O_WRONLY, 0); /* for stderr */
-
-        /* skip warning */
-        fd = fd;
+    #if defined(RT_USING_DFS_DEVFS) && defined(RT_USING_POSIX_STDIN)
+        libc_stdio_set_console(dev_console->parent.name, O_RDWR);
+    #else
+        libc_stdio_set_console(dev_console->parent.name, O_WRONLY);
+    #endif
     }
 #endif
 
     /* set PATH and HOME */
     putenv("PATH=/bin");
     putenv("HOME=/home");
+
 #if defined RT_USING_PTHREADS && !defined RT_USING_COMPONENTS_INIT
     pthread_system_init();
 #endif

components/libc/compilers/newlib/libc.h

@@ -1,3 +1,28 @@
+/*
+ * File     : libc.h
+ * Brief    : gcc libc header file
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
 #ifndef __RTT_LIBC_H__
 #define __RTT_LIBC_H__
 
@@ -12,6 +37,7 @@
 #define NANOSECOND_PER_TICK     (NANOSECOND_PER_SECOND  / RT_TICK_PER_SECOND)
 
 int libc_system_init(void);
+int libc_stdio_set_console(const char* device_name, int mode);
 
 /* some time related function */
 int libc_set_time(const struct timespec *time);

components/libc/compilers/newlib/libc_sym.c

@@ -1,47 +0,0 @@
-#include <rtthread.h>
-#include <rtm.h>
-
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-RTM_EXPORT(strcpy);
-RTM_EXPORT(strncpy);
-RTM_EXPORT(strlen);
-RTM_EXPORT(strcat);
-RTM_EXPORT(strstr);
-RTM_EXPORT(strchr);
-RTM_EXPORT(strcmp);
-RTM_EXPORT(strtol);
-RTM_EXPORT(strtoul);
-RTM_EXPORT(strncmp);
-
-RTM_EXPORT(memcpy);
-RTM_EXPORT(memcmp);
-RTM_EXPORT(memmove);
-RTM_EXPORT(memset);
-RTM_EXPORT(memchr);
-
-RTM_EXPORT(putchar);
-RTM_EXPORT(puts);
-RTM_EXPORT(printf);
-RTM_EXPORT(sprintf);
-RTM_EXPORT(snprintf);
-
-RTM_EXPORT(fwrite);
-
-#include <time.h>
-RTM_EXPORT(localtime);
-RTM_EXPORT(time);
-
-#include <setjmp.h>
-RTM_EXPORT(longjmp);
-RTM_EXPORT(setjmp);
-
-RTM_EXPORT(exit);
-RTM_EXPORT(abort);
-
-RTM_EXPORT(rand);
-
-#include <assert.h>
-RTM_EXPORT(__assert_func);

components/libc/compilers/newlib/libc_syms.c

@@ -0,0 +1,72 @@
+/*
+ * File     : libc_syms.c
+ * Brief    : exported symbols for libc.
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#include <rtthread.h>
+#include <rtm.h>
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+RTM_EXPORT(strcpy);
+RTM_EXPORT(strncpy);
+RTM_EXPORT(strlen);
+RTM_EXPORT(strcat);
+RTM_EXPORT(strstr);
+RTM_EXPORT(strchr);
+RTM_EXPORT(strcmp);
+RTM_EXPORT(strtol);
+RTM_EXPORT(strtoul);
+RTM_EXPORT(strncmp);
+
+RTM_EXPORT(memcpy);
+RTM_EXPORT(memcmp);
+RTM_EXPORT(memmove);
+RTM_EXPORT(memset);
+RTM_EXPORT(memchr);
+
+RTM_EXPORT(putchar);
+RTM_EXPORT(puts);
+RTM_EXPORT(printf);
+RTM_EXPORT(sprintf);
+RTM_EXPORT(snprintf);
+
+RTM_EXPORT(fwrite);
+
+#include <time.h>
+RTM_EXPORT(localtime);
+RTM_EXPORT(time);
+
+#include <setjmp.h>
+RTM_EXPORT(longjmp);
+RTM_EXPORT(setjmp);
+
+RTM_EXPORT(exit);
+RTM_EXPORT(abort);
+
+RTM_EXPORT(rand);
+
+#include <assert.h>
+RTM_EXPORT(__assert_func);

components/libc/compilers/newlib/stdio.c

@@ -0,0 +1,85 @@
+/*
+ * File     : stdio.c
+ * Brief    : stdio for newlib
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <rtthread.h>
+#include "libc.h"
+
+#define STDIO_DEVICE_NAME_MAX   32
+
+static FILE* std_console = NULL;
+
+int libc_stdio_set_console(const char* device_name, int mode)
+{
+    FILE *fp;
+    char name[STDIO_DEVICE_NAME_MAX];
+    char *file_mode;
+
+    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
+    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
+
+    if (mode == O_RDWR) file_mode = "r+";
+    else if (mode == O_WRONLY) file_mode = "wb";
+    else if (mode == O_RDONLY) file_mode = "rb";
+
+    fp = fopen(name, file_mode);
+    if (fp)
+    {
+        setvbuf(fp, NULL, _IONBF, 0);
+
+        if (std_console)
+        {
+            fclose(std_console);
+            std_console = NULL;
+        }
+        std_console = fp;
+
+        if (mode == O_RDWR)
+        {
+            _GLOBAL_REENT->_stdin  = std_console;
+        }
+        else 
+        {
+            _GLOBAL_REENT->_stdin  = NULL;
+        }
+
+        if (mode == O_RDONLY)
+        {
+            _GLOBAL_REENT->_stdout = NULL;
+            _GLOBAL_REENT->_stderr = NULL;
+        }
+        else
+        {
+            _GLOBAL_REENT->_stdout = std_console;
+            _GLOBAL_REENT->_stderr = std_console;
+        }
+
+        _GLOBAL_REENT->__sdidinit = 1;
+    }
+
+    return fileno(std_console);
+}

components/libc/compilers/newlib/sys/fcntl.h

@@ -13,6 +13,4 @@
 #define O_DIRECTORY     0x0200000
 #define O_BINARY        0x0008000
 
-#include <unistd.h>
-
 #endif

components/libc/compilers/newlib/syscalls.c

@@ -205,30 +205,23 @@ _wait_r(struct _reent *ptr, int *status)
 _ssize_t
 _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
-	if (fd < 3)
+#ifndef RT_USING_DFS
+	if (fd == 0)
 	{
-#ifdef RT_USING_CONSOLE
-		rt_device_t console_device;
-		extern rt_device_t rt_console_get_device(void);
+		rt_device_t console;
 
-		console_device = rt_console_get_device();
-		if (console_device != 0) rt_device_write(console_device, 0, buf, nbytes);
-		return nbytes;
-#else
-        return 0;
-#endif
+		console = rt_console_get_device();
+		if (console) return rt_device_write(console, -1, buf, nbytes);
 	}
-	else
-	{
-#ifdef RT_USING_DFS
-	    _ssize_t rc;
 
-	    rc = write(fd, buf, nbytes);
-	    return rc;
+    return 0;
+
 #else
-        return 0;
+	_ssize_t rc;
+
+	rc = write(fd, buf, nbytes);
+	return rc;
 #endif
-	}
 }
 #endif