/**************************************************************************** * libs/libc/unistd/lib_gethostname.c * * Copyright (C) 2015 Stavros Polymenis. All rights reserved. * Copyright (C) 2015, 2016 Gregory Nutt. All rights reserved. * Author: Stavros Polymenis * Gregory Nutt * * 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 #include #include #include /* This file is only compiled if network support is enabled */ #ifdef CONFIG_NET /* Further, in the protected and kernel build modes where kernel and * application code are separated, the hostname is a common system property * and must reside only in the kernel. In that case, this accessor * function only be called from user space is only via a kernel system call. */ #if (!defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL)) || \ defined(__KERNEL__) /**************************************************************************** * 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 ****************************************************************************/ /**************************************************************************** * Name: sethostname * * Description: * * 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.) * * Conforming To * SVr4, 4.4BSD (these interfaces first appeared in 4.2BSD). POSIX.1-2001 * specifies gethostname() but not sethostname(). * * 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 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 = enter_critical_section(); strncpy(g_hostname, name, MIN(HOST_NAME_MAX, size)); g_hostname[HOST_NAME_MAX] = '\0'; leave_critical_section(flags); return 0; } #endif /* CONFIG_NET */ #endif /* (!CONFIG_BUILD_PROTECTED && !CONFIG_BUILD_KERNEL) || __KERNEL__ */