88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2014.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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hostname.cpp
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System calls for managing the hostname of the current system.
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*******************************************************************************/
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#include <errno.h>
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#include <string.h>
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#include <sortix/limits.h>
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#include <sortix/kernel/copy.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/syscall.h>
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#include "hostname.h"
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namespace Sortix {
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namespace Hostname {
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static kthread_mutex_t hostname_lock = KTHREAD_MUTEX_INITIALIZER;
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static char hostname[HOST_NAME_MAX + 1] = "sortix";
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static size_t hostname_length = 6;
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static int sys_gethostname(char* dst_name, size_t dst_name_size)
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{
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if ( dst_name_size == 0 )
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return errno = EINVAL, -1;
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size_t dst_name_length = dst_name_size - 1;
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ScopedLock lock(&hostname_lock);
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if ( dst_name_length < hostname_length )
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errno = ERANGE;
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if ( hostname_length < dst_name_length )
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dst_name_length = hostname_length;
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if ( !CopyToUser(dst_name, hostname, dst_name_length) )
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return -1;
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char nul = '\0';
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if ( !CopyToUser(dst_name + dst_name_length, &nul, 1) )
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return -1;
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return 0;
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}
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static int sys_sethostname(const char* src_name, size_t src_name_size)
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{
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char new_hostname[HOST_NAME_MAX + 1];
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if ( sizeof(new_hostname) < src_name_size )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(new_hostname, src_name, src_name_size) )
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return -1;
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size_t new_hostname_length = strnlen(new_hostname, sizeof(new_hostname));
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if ( HOST_NAME_MAX < new_hostname_length )
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return errno = EINVAL, -1;
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new_hostname[new_hostname_length] = '\0';
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ScopedLock lock(&hostname_lock);
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memcpy(hostname, new_hostname, new_hostname_length + 1);
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hostname_length = new_hostname_length;
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return 0;
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}
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void Init()
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{
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Syscall::Register(SYSCALL_GETHOSTNAME, (void*) sys_gethostname);
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Syscall::Register(SYSCALL_SETHOSTNAME, (void*) sys_sethostname);
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}
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} // namespace Hostname
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} // namespace Sortix
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