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/* gethostname emulation for SysV and POSIX.1.
Copyright (C) 1992, 2003, 2006, 2008-2020 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* David MacKenzie <djm@gnu.ai.mit.edu>
Windows port by Simon Josefsson <simon@josefsson.org> */
#include <config.h>
#if !(defined _WIN32 && !defined __CYGWIN__)
/* Unix API. */
/* Specification. */
#include <unistd.h>
#ifdef HAVE_UNAME
# include <sys/utsname.h>
#endif
#include <string.h>
/* Put up to LEN chars of the host name into NAME.
Null terminate it if the name is shorter than LEN.
Return 0 if ok, -1 if error. */
#include <stddef.h>
int
gethostname (char *name, size_t len)
{
#ifdef HAVE_UNAME
struct utsname uts;
if (uname (&uts) == -1)
return -1;
if (len > sizeof (uts.nodename))
{
/* More space than we need is available. */
name[sizeof (uts.nodename)] = '\0';
len = sizeof (uts.nodename);
}
strncpy (name, uts.nodename, len);
#else
strcpy (name, ""); /* Hardcode your system name if you want. */
#endif
return 0;
}
#else
/* Native Windows API. Which primitive to choose?
- gethostname() requires linking with -lws2_32.
- GetComputerName() does not return the right kind of hostname.
- GetComputerNameEx(ComputerNameDnsHostname,...) returns the right hostname,
but it is hard to use portably:
- It requires defining _WIN32_WINNT to at least 0x0500.
- With mingw, it also requires
"#define GetComputerNameEx GetComputerNameExA".
- With older versions of mingw, none of the declarations are present at
all, not even of the enum value ComputerNameDnsHostname.
So we use gethostname(). Linking with -lws2_32 is the least evil. */
#define WIN32_LEAN_AND_MEAN
/* Get winsock2.h. */
#include <unistd.h>
/* Get INT_MAX. */
#include <limits.h>
/* Get set_winsock_errno. */
#include "w32sock.h"
#include "sockets.h"
#undef gethostname
int
rpl_gethostname (char *name, size_t len)
{
int r;
if (len > INT_MAX)
len = INT_MAX;
gl_sockets_startup (SOCKETS_1_1);
r = gethostname (name, (int) len);
if (r < 0)
set_winsock_errno ();
return r;
}
#endif
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