Undo part of a previous change. Move get/sethostname back from net/netdb to libc/unistd

2026-06-06 08:36:24 +08:00 · 2015-07-08 11:11:52 -06:00
parent 4e98d01098
commit f94fe747ae
13 changed files with 73 additions and 530 deletions
@@ -172,6 +172,8 @@ struct hostent
                            * terminated by a null pointer. */
 };
 #define h_addr h_addr_list[0] /* For backward compatibility */
 struct netent
 {
  FAR char  *n_name;       /* Official, fully-qualified (including the domain)
@@ -1,127 +0,0 @@
 /****************************************************************************
 * include/nuttx/net/netdb.h
 *
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author:  Gregory Nutt <gnutt@nuttx.org>
 *
 * Includes some definitions that a compatible with the LGPL GNU C Library
 * header file of the same name.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/
 #ifndef __INCLUDE_NUTTX_NET_NETDB_H
 #define __INCLUDE_NUTTX_NET_NETDB_H
 /****************************************************************************
 * Included Files
 ****************************************************************************/
 #include <nuttx/config.h>
 #include <sys/types.h>
 #include <nuttx/net/netconfig.h>
 /****************************************************************************
 * Public Type Definitions
 ****************************************************************************/
 /****************************************************************************
 * Public Data
 ****************************************************************************/
 /****************************************************************************
 * Public Data
 ****************************************************************************/
 #ifdef __cplusplus
 #define EXTERN extern "C"
 extern "C"
 {
 #else
 #define EXTERN extern
 #endif
 /****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/
 /****************************************************************************
 * Name: netdb_gethostname
 *
 * Description:
 *   The netdb_gethostname() function will return the standard host name for
 *   the current machine. The namelen argument will specify the size of the
 *   array pointed to by the name argument. The returned name will be null-
 *   terminated, except that if namelen is an insufficient length to hold the
 *   host name, then the returned name will be truncated and it is
 *   unspecified whether the returned name is null-terminated.
 *
 *   Host names are limited to {HOST_NAME_MAX} bytes.
 *
 * Input Parameters:
 *   name - The user-provided buffer to receive the host name.
 *   namelen - The size of the user provided buffer in bytes.
 *
 * Returned Value:
 *   Upon successful completion, 0 will be returned; otherwise, -1 will be
 *   returned.  No errors are defined;  errno variable is not set.
 *
 ****************************************************************************/
 int netdb_gethostname(FAR char *name, size_t namelen);
 /****************************************************************************
 * Name: netdb_sethostname
 *
 * Description:
 *
 *   netdb_sethostname() sets the hostname to the value given in the
 *   character array name. The len argument specifies the number of bytes in
 *   name.  (Thus, name does not require a terminating null byte.)
 *
 * Input Parameters:
 *   name - The user buffer to providing the new host name.
 *   namelen - The size of the user buffer in bytes.
 *
 * Returned Value:
 *   Upon successful completion, 0 will be returned; otherwise, -1 will be
 *   returned.  No errors are defined;  errno variable is not set.
 *
 ****************************************************************************/
 int netdb_sethostname(FAR const char *name, size_t size);
 #undef EXTERN
 #ifdef __cplusplus
 }
 #endif
 #endif /* __INCLUDE_NUTTX_NET_NETDB_H */
@@ -43,7 +43,6 @@
 #include <string.h>
 #include <nuttx/version.h>
 #include <nuttx/net/netdb.h>
 /* In the protected and kernel build modes where kernel and application code
 * are separated, some of these common system property must reside only in
@@ -101,7 +100,7 @@ int uname(FAR struct utsname *name)
 #ifdef CONFIG_NET
  /* Get the hostname */
-  if (-1 == netdb_gethostname(name->nodename, HOST_NAME_MAX))
+  if (-1 == gethostname(name->nodename, HOST_NAME_MAX))
    {
      ret = -1;
    }
@@ -2,7 +2,9 @@
 * libc/unistd/lib_gethostname.c
 *
 *   Copyright (C) 2015 Stavros Polymenis. All rights reserved.
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Stavros Polymenis <sp@orbitalfox.com>
 *           Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
@@ -43,7 +45,7 @@
 #include <string.h>
 #include <unistd.h>
-#include <nuttx/net/netdb.h>
+#include <arch/irq.h>
 /* This file is only compiled if network support is enabled */
@@ -53,6 +55,22 @@
 * Pre-processor Definitions
 ****************************************************************************/
 /* The default host name is a system configuration setting.  This may be
 * changed via sethostname(), however.
 */
 #ifndef CONFIG_NET_HOSTNAME
 #  define CONFIG_NET_HOSTNAME ""
 #endif
 /****************************************************************************
 * Public Data
 ****************************************************************************/
 /* This is the system hostname */
 char g_hostname[HOST_NAME_MAX + 1] = CONFIG_NET_HOSTNAME;
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@@ -94,6 +112,21 @@ int gethostname(FAR char *name, size_t namelen)
 #if (!defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL)) || \
      defined(__KERNEL__)
  irqstate_t flags;
  /* Return the host name, truncating to fit into the user provided buffer.
   * The hostname is global resource.  There is a microscopic possibility
   * that it could change while we are copying it.
   */
  flags = irqsave();
  strncpy(name, g_hostname, namelen);
  irqrestore(flags);
  return 0;
 #else
  struct utsname info;
  int ret;
@@ -110,12 +143,6 @@ int gethostname(FAR char *name, size_t namelen)
  strncpy(name, info.nodename, namelen);
  return 0;
 #else
  /* Otherwise, this function is just a thin wrapper around
   * netdb_gethostname().
   */
  return netdb_gethostname(name, namelen);
 #endif
 }
@@ -39,9 +39,10 @@
 #include <nuttx/config.h>
 #include <string.h>
 #include <unistd.h>
-#include <nuttx/net/netdb.h>
+#include <arch/irq.h>
 /* This file is only compiled if network support is enabled */
@@ -60,6 +61,26 @@
 * Pre-processor Definitions
 ****************************************************************************/
 /****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
 #ifndef MIN
 #  define MIN(a,b) ((a) < (b) ? (a) : (b))
 #endif
 #ifndef MAX
 #  define MAX(a,b) ((a) > (b) ? (a) : (b))
 #endif
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
 /* This is the system hostname (defined in lib_gethostname). */
 extern char g_hostname[HOST_NAME_MAX + 1];
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@@ -89,9 +110,20 @@
 int sethostname(FAR const char *name, size_t size)
 {
-  /* This is just a thin layer over netdb_sethostname() */
+  irqstate_t flags;
-  return netdb_sethostname(name, size);
+  /* Save the new host name, truncating to HOST_NAME_MAX if necessary.  This
   * internal copy is always NUL terminated.  The hostname is global resource.
   * There is a microscopic possibility that it could be accessed while we
   * are setting it.
   */
  flags = irqsave();
  strncpy(g_hostname, name, MIN(HOST_NAME_MAX, size));
  g_hostname[HOST_NAME_MAX] = '\0';
  irqrestore(flags);
  return 0;
 }
 #endif /* CONFIG_NET */
@@ -68,7 +68,6 @@ include local/Make.defs
 include tcp/Make.defs
 include udp/Make.defs
 include devif/Make.defs
 include netdb/Make.defs
 include route/Make.defs
 include utils/Make.defs
 endif
@@ -21,7 +21,6 @@ Directory Structure
       +- route    - Routing table support
       +- tcp      - Transmission Control Protocol
       +- udp      - User Datagram Protocol
       +- netdb    - Host name support
       `- utils    - Miscellaneous utility functions
@@ -1,43 +0,0 @@
 ############################################################################
 # net/netdb/Make.defs
 #
 #   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1. Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above copyright
 #    notice, this list of conditions and the following disclaimer in
 #    the documentation and/or other materials provided with the
 #    distribution.
 # 3. Neither the name NuttX nor the names of its contributors may be
 #    used to endorse or promote products derived from this software
 #    without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 # COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 # OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 #
 ############################################################################
 # Network database interface source files
 NET_CSRCS += netdb_gethostname.c netdb_sethostname.c netdb_globals.c
 # Include database device interface build support
 DEPPATH += --dep-path netdb
 VPATH += :netdb
@@ -1,76 +0,0 @@
 /****************************************************************************
 * net/netdb/netdb.h
 *
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/
 #ifndef _NET_NETDB_NETDB_H
 #define _NET_NETDB_NETDB_H
 /****************************************************************************
 * Included Files
 ****************************************************************************/
 #include <nuttx/config.h>
 #include <unistd.h>
 /****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
 /****************************************************************************
 * Public Data
 ****************************************************************************/
 #ifdef __cplusplus
 #define EXTERN extern "C"
 extern "C"
 {
 #else
 #define EXTERN extern
 #endif
 /* This is the system hostname */
 EXTERN char g_hostname[HOST_NAME_MAX + 1];
 /****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/
 #undef EXTERN
 #ifdef __cplusplus
 }
 #endif
 #endif /* _NET_NETDB_NETDB_H */
@@ -1,98 +0,0 @@
 /****************************************************************************
 * net/netdb/netdb_gethostname.c
 *
 *   Copyright (C) 2015 Stavros Polymenis. All rights reserved.
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Stavros Polymenis <sp@orbitalfox.com>
 *           Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/
 /****************************************************************************
 * Included Files
 ****************************************************************************/
 #include <nuttx/config.h>
 #include <string.h>
 #include <unistd.h>
 #include <unistd.h>
 #include <nuttx/net/netdb.h>
 #include <arch/irq.h>
 #include "netdb/netdb.h"
 /****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
 /****************************************************************************
 * Name: netdb_gethostname
 *
 * Description:
 *   The netdb_gethostname() function will return the standard host name for
 *   the current machine. The namelen argument will specify the size of the
 *   array pointed to by the name argument. The returned name will be null-
 *   terminated, except that if namelen is an insufficient length to hold the
 *   host name, then the returned name will be truncated and it is
 *   unspecified whether the returned name is null-terminated.
 *
 *   Host names are limited to {HOST_NAME_MAX} bytes.
 *
 * Input Parameters:
 *   name - The user-provided buffer to receive the host name.
 *   namelen - The size of the user provided buffer in bytes.
 *
 * Returned Value:
 *   Upon successful completion, 0 will be returned; otherwise, -1 will be
 *   returned.  No errors are defined;  errno variable is not set.
 *
 ****************************************************************************/
 int netdb_gethostname(FAR char *name, size_t namelen)
 {
  irqstate_t flags;
  /* Return the host name, truncating to fit into the user provided buffer.
   * The hostname is global resource.  There is a microscopic possibility
   * that it could change while we are copying it.
   */
  flags = irqsave();
  strncpy(name, g_hostname, namelen);
  irqrestore(flags);
  return 0;
 }
@@ -1,68 +0,0 @@
 /****************************************************************************
 * net/netdb/netdb_globals.c
 *
 *   Copyright (C) 2015 Stavros Polymenis. All rights reserved.
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Stavros Polymenis <sp@orbitalfox.com>
 *           Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/
 /****************************************************************************
 * Included Files
 ****************************************************************************/
 #include <nuttx/config.h>
 #include "netdb/netdb.h"
 /****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
 /* The default host name is a system configuration setting.  This may be
 * changed via sethostname(), however.
 */
 #ifndef CONFIG_NET_HOSTNAME
 #  define CONFIG_NET_HOSTNAME ""
 #endif
 /****************************************************************************
 * Public Data
 ****************************************************************************/
 /* This is the system hostname */
 char g_hostname[HOST_NAME_MAX + 1] = CONFIG_NET_HOSTNAME;
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@@ -1,103 +0,0 @@
 /****************************************************************************
 * net/netdb/netdb_sethostname.c
 *
 *   Copyright (C) 2015 Stavros Polymenis. All rights reserved.
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Stavros Polymenis <sp@orbitalfox.com>
 *           Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/
 /****************************************************************************
 * Included Files
 ****************************************************************************/
 #include <nuttx/config.h>
 #include <string.h>
 #include <unistd.h>
 #include <nuttx/net/netdb.h>
 #include <arch/irq.h>
 #include "netdb/netdb.h"
 /****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
 #ifndef MIN
 #  define MIN(a,b) ((a) < (b) ? (a) : (b))
 #endif
 #ifndef MAX
 #  define MAX(a,b) ((a) > (b) ? (a) : (b))
 #endif
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
 /****************************************************************************
 * Name: netdb_sethostname
 *
 * Description:
 *
 *   netdb_sethostname() sets the hostname to the value given in the
 *   character array name. The len argument specifies the number of bytes in
 *   name.  (Thus, name does not require a terminating null byte.)
 *
 * Input Parameters:
 *   name - The user buffer to providing the new host name.
 *   namelen - The size of the user buffer in bytes.
 *
 * Returned Value:
 *   Upon successful completion, 0 will be returned; otherwise, -1 will be
 *   returned.  No errors are defined;  errno variable is not set.
 *
 ****************************************************************************/
 int netdb_sethostname(FAR const char *name, size_t size)
 {
  irqstate_t flags;
  /* Save the new host name, truncating to HOST_NAME_MAX if necessary.  This
   * internal copy is always NUL terminated.  The hostname is global resource.
   * There is a microscopic possibility that it could be accessed while we
   * are setting it.
   */
  flags = irqsave();
  strncpy(g_hostname, name, MIN(HOST_NAME_MAX, size));
  g_hostname[HOST_NAME_MAX] = '\0';
  irqrestore(flags);
  return 0;
 }