kernel/lib: Use the hostname.cpp from libroot.

The libroot version contains one minor bugfix but otherwise is the same.

src/system/kernel/lib/Jamfile

@@ -106,6 +106,7 @@ KernelMergeObject kernel_lib_posix.o :
 	close.c
 	directory.c
 	dup.c
+	hostname.cpp
 	ioctl.c
 	link.c
 	lseek.c

src/system/kernel/util/Jamfile

@@ -6,7 +6,6 @@ KernelMergeObject kernel_util.o :
 	AVLTreeBase.cpp
 	Bitmap.cpp
 	convertutf.cpp
-	hostname.cpp
 	inet_addr.c
 	inet_ntop.c
 	kernel_cpp.cpp

src/system/kernel/util/hostname.cpp

@@ -1,92 +0,0 @@
-/*
- * Copyright 2002-2007, Axel Dörfler, [email protected]. All rights reserved.
- * Distributed under the terms of the MIT License.
- */
-
-
-#include <errno.h>
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <FindDirectory.h>
-#include <StorageDefs.h>
-
-#include <errno_private.h>
-#include <find_directory_private.h>
-
-
-static status_t
-get_path(char *path, bool create)
-{
-	status_t status = __find_directory(B_SYSTEM_SETTINGS_DIRECTORY, -1, create,
-		path, B_PATH_NAME_LENGTH);
-	if (status != B_OK)
-		return status;
-
-	strlcat(path, "/network", B_PATH_NAME_LENGTH);
-	if (create)
-		mkdir(path, 0755);
-	strlcat(path, "/hostname", B_PATH_NAME_LENGTH);
-	return B_OK;
-}
-
-
-extern "C" int
-sethostname(const char *hostName, size_t nameSize)
-{
-	char path[B_PATH_NAME_LENGTH];
-	if (get_path(path, false) != B_OK) {
-		__set_errno(B_ERROR);
-		return -1;
-	}
-
-	int file = open(path, O_WRONLY | O_CREAT, 0644);
-	if (file < 0)
-		return -1;
-
-	nameSize = min_c(nameSize, MAXHOSTNAMELEN);
-
-	if (write(file, hostName, nameSize) != (ssize_t)nameSize
-		|| write(file, "\n", 1) != 1) {
-		close(file);
-		return -1;
-	}
-
-	close(file);
-	return 0;
-}
-
-
-extern "C" int
-gethostname(char *hostName, size_t nameSize)
-{
-	// look up hostname from network settings hostname file
-
-	char path[B_PATH_NAME_LENGTH];
-	if (get_path(path, false) != B_OK) {
-		__set_errno(B_ERROR);
-		return -1;
-	}
-
-	int file = open(path, O_RDONLY);
-	if (file < 0)
-		return -1;
-
-	nameSize = min_c(nameSize, MAXHOSTNAMELEN);
-
-	int length = read(file, hostName, nameSize - 1);
-	close(file);
-
-	if (length < 0)
-		return -1;
-
-	hostName[length] = '\0';
-
-	char *end = strpbrk(hostName, "\r\n\t");
-	if (end != NULL)
-		end[0] = '\0';
-
-	return 0;
-}
-