115 lines
4.5 KiB
C
115 lines
4.5 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_sethostname.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 <string.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include <nuttx/irq.h>
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/* Further, in the protected and kernel build modes where kernel and
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* application code are separated, the hostname is a common system property
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* and must reside only in the kernel. In that case, this accessor
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* function only be called from user space is only via a kernel system call.
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*/
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#if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/* This is the system hostname (defined in lib_gethostname). */
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extern char g_hostname[HOST_NAME_MAX + 1];
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sethostname
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*
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* Description:
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*
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* sethostname() sets the hostname to the value given in the character
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* array name. The len argument specifies the number of bytes in name.
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* (Thus, name does not require a terminating null byte.)
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*
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* Conforming To
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* SVr4, 4.4BSD (these interfaces first appeared in 4.2BSD). POSIX.1-2001
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* specifies gethostname() but not sethostname().
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*
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* Input Parameters:
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* name - The user buffer to providing the new host name.
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* namelen - The size of the user 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 sethostname(FAR const char *name, size_t namelen)
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{
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irqstate_t flags;
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/* Save the new host name, truncating to HOST_NAME_MAX if necessary. This
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* internal copy is always NUL terminated. The hostname is global resource.
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* There is a microscopic possibility that it could be accessed while we
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* are setting it.
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*/
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flags = enter_critical_section();
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strlcpy(g_hostname, name, sizeof(g_hostname));
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leave_critical_section(flags);
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return 0;
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}
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#endif /* CONFIG_BUILD_FLAT || __KERNEL__ */
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