cf99fb40c9
Squashed commit of the following:
libs/libxx: Fix some confusing in naming. If the directory is called libxx, then the library must be libxx.a (unless perhaps LIBCXX is selected).
libs/: Fix paths in moved library directories.
libs: Brute force move of libc, libnx, and libxx to libs. Cannot yet build it in that configuration.
150 lines
5.2 KiB
C
150 lines
5.2 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_gethostname.c
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*
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* Copyright (C) 2015 Stavros Polymenis. All rights reserved.
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* Copyright (C) 2015, 2016 Gregory Nutt. All rights reserved.
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* Author: Stavros Polymenis <sp@orbitalfox.com>
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* Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/utsname.h>
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#include <string.h>
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#include <unistd.h>
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#include <nuttx/irq.h>
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/* This file is only compiled if network support is enabled */
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#ifdef CONFIG_NET
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The default host name is a system configuration setting. This may be
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* changed via sethostname(), however.
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*/
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#ifndef CONFIG_NET_HOSTNAME
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# define CONFIG_NET_HOSTNAME ""
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* This is the system hostname */
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char g_hostname[HOST_NAME_MAX + 1] = CONFIG_NET_HOSTNAME;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gethostname
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*
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* Description:
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* The gethostname() function will return the standard host name for the
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* current machine. The namelen argument will specify the size of the
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* array pointed to by the name argument. The returned name will be null-
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* terminated, except that if namelen is an insufficient length to hold the
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* host name, then the returned name will be truncated and it is
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* unspecified whether the returned name is null-terminated.
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*
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* Host names are limited to {HOST_NAME_MAX} bytes.
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*
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* Input Parameters:
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* name - The user-provided buffer to receive the host name.
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* namelen - The size of the user provided buffer in bytes.
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*
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* Returned Value:
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* Upon successful completion, 0 will be returned; otherwise, -1 will be
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* returned. No errors are defined; errno variable is not set.
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*
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****************************************************************************/
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int gethostname(FAR char *name, size_t namelen)
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{
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/* In the protected and kernel build modes where kernel and application code
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* are separated, the hostname is a common system property and must reside
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* only in the kernel. In that case, we need to do things differently.
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*
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* uname() is implemented as a system call and can be called from user space.
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* So, in these configurations we will get the hostname via the uname
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* function.
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*/
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#if (!defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL)) || \
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defined(__KERNEL__)
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irqstate_t flags;
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/* Return the host name, truncating to fit into the user provided buffer.
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* The hostname is global resource. There is a microscopic possibility
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* that it could change while we are copying it.
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*/
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flags = enter_critical_section();
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strncpy(name, g_hostname, namelen);
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leave_critical_section(flags);
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return 0;
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#else
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struct utsname info;
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int ret;
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/* Get uname data */
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ret = uname(&info);
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if (ret < 0)
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{
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return ret;
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}
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/* Return the nodename from the uname data */
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strncpy(name, info.nodename, namelen);
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return 0;
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#endif
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}
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#endif /* CONFIG_NET */
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