diff --git a/include/nuttx/net/netdb.h b/include/nuttx/net/netdb.h new file mode 100644 index 0000000000..bdccd140fc --- /dev/null +++ b/include/nuttx/net/netdb.h @@ -0,0 +1,127 @@ +/**************************************************************************** + * include/nuttx/net/netdb.h + * + * Copyright (C) 2015 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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 + +#include + +#include + +/**************************************************************************** + * 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 */ diff --git a/libc/unistd/lib_sethostname.c b/libc/unistd/lib_sethostname.c new file mode 100644 index 0000000000..20ac5bbc77 --- /dev/null +++ b/libc/unistd/lib_sethostname.c @@ -0,0 +1,98 @@ +/**************************************************************************** + * libc/unistd/lib_gethostname.c + * + * Copyright (C) 2015 Stavros Polymenis. All rights reserved. + * Author: Stavros Polymenis + * + * 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 + +/* 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 + ****************************************************************************/ + +/**************************************************************************** + * 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) +{ + /* This is just a thin layer over netdb_sethostname() */ + + return netdb_sethostname(name, size); +} + +#endif /* CONFIG_NET */ +#endif /* (!CONFIG_BUILD_PROTECTED && !CONFIG_BUILD_KERNEL) || __KERNEL__ */ diff --git a/net/Makefile b/net/Makefile index ce3faf0f3a..413f159609 100644 --- a/net/Makefile +++ b/net/Makefile @@ -68,6 +68,7 @@ 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 diff --git a/net/README.txt b/net/README.txt index db0a59452a..c4f12ffd22 100644 --- a/net/README.txt +++ b/net/README.txt @@ -21,6 +21,7 @@ Directory Structure +- route - Routing table support +- tcp - Transmission Control Protocol +- udp - User Datagram Protocol + +- netdb - Host name support `- utils - Miscellaneous utility functions diff --git a/net/netdb/Make.defs b/net/netdb/Make.defs new file mode 100644 index 0000000000..b4ac51d7e8 --- /dev/null +++ b/net/netdb/Make.defs @@ -0,0 +1,43 @@ +############################################################################ +# net/netdb/Make.defs +# +# Copyright (C) 2015 Gregory Nutt. All rights reserved. +# Author: 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. +# +############################################################################ + +# 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 diff --git a/net/netdb/netdb.h b/net/netdb/netdb.h new file mode 100644 index 0000000000..cb86302db7 --- /dev/null +++ b/net/netdb/netdb.h @@ -0,0 +1,76 @@ +/**************************************************************************** + * net/netdb/netdb.h + * + * Copyright (C) 2015 Gregory Nutt. All rights reserved. + * Author: 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. + * + ****************************************************************************/ + +#ifndef _NET_NETDB_NETDB_H +#define _NET_NETDB_NETDB_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include + +#include + +/**************************************************************************** + * 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 */ diff --git a/net/netdb/netdb_gethostname.c b/net/netdb/netdb_gethostname.c new file mode 100644 index 0000000000..a7667ec2ce --- /dev/null +++ b/net/netdb/netdb_gethostname.c @@ -0,0 +1,98 @@ +/**************************************************************************** + * net/netdb/netdb_gethostname.c + * + * Copyright (C) 2015 Stavros Polymenis. All rights reserved. + * Copyright (C) 2015 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 + +#include +#include + +#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; +} diff --git a/net/netdb/netdb_globals.c b/net/netdb/netdb_globals.c new file mode 100644 index 0000000000..fe29864b43 --- /dev/null +++ b/net/netdb/netdb_globals.c @@ -0,0 +1,68 @@ +/**************************************************************************** + * net/netdb/netdb_globals.c + * + * Copyright (C) 2015 Stavros Polymenis. All rights reserved. + * Copyright (C) 2015 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 "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 + ****************************************************************************/ diff --git a/net/netdb/netdb_sethostname.c b/net/netdb/netdb_sethostname.c new file mode 100644 index 0000000000..8114534aa5 --- /dev/null +++ b/net/netdb/netdb_sethostname.c @@ -0,0 +1,103 @@ +/**************************************************************************** + * net/netdb/netdb_sethostname.c + * + * Copyright (C) 2015 Stavros Polymenis. All rights reserved. + * Copyright (C) 2015 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 +#include + +#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; +}