Kernel: Move syscall implementations out of Process.cpp

This is something I've been meaning to do for a long time, and here we
finally go. This patch moves all sys$foo functions out of Process.cpp
and into files in Kernel/Syscalls/.

It's not exactly one syscall per file (although it could be, but I got
a bit tired of the repetitive work here..)

This makes hacking on individual syscalls a lot less painful since you
don't have to rebuild nearly as much code every time. I'm also hopeful
that this makes it easier to understand individual syscalls. :^)

1 files changed, 73 insertions, 0 deletions

diff --git a/Kernel/Syscalls/ttyname.cpp b/Kernel/Syscalls/ttyname.cpp
new file mode 100644
index 0000000000..fb5f33e81e
--- /dev/null
+++ b/Kernel/Syscalls/ttyname.cpp
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * 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 HOLDER 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.
+ */
+
+#include <Kernel/FileSystem/FileDescription.h>
+#include <Kernel/Process.h>
+#include <Kernel/TTY/MasterPTY.h>
+#include <Kernel/TTY/TTY.h>
+
+namespace Kernel {
+
+int Process::sys$ttyname_r(int fd, char* buffer, ssize_t size)
+{
+    REQUIRE_PROMISE(tty);
+    if (size < 0)
+        return -EINVAL;
+    if (!validate_write(buffer, size))
+        return -EFAULT;
+    auto description = file_description(fd);
+    if (!description)
+        return -EBADF;
+    if (!description->is_tty())
+        return -ENOTTY;
+    String tty_name = description->tty()->tty_name();
+    if ((size_t)size < tty_name.length() + 1)
+        return -ERANGE;
+    copy_to_user(buffer, tty_name.characters(), tty_name.length() + 1);
+    return 0;
+}
+
+int Process::sys$ptsname_r(int fd, char* buffer, ssize_t size)
+{
+    REQUIRE_PROMISE(tty);
+    if (size < 0)
+        return -EINVAL;
+    if (!validate_write(buffer, size))
+        return -EFAULT;
+    auto description = file_description(fd);
+    if (!description)
+        return -EBADF;
+    auto* master_pty = description->master_pty();
+    if (!master_pty)
+        return -ENOTTY;
+    auto pts_name = master_pty->pts_name();
+    if ((size_t)size < pts_name.length() + 1)
+        return -ERANGE;
+    copy_to_user(buffer, pts_name.characters(), pts_name.length() + 1);
+    return 0;
+}
+
+}