8 files changed, 128 insertions, 1 deletions
diff --git a/src/io/dir.cpp b/src/io/dir.cpp
new file mode 100644
index 0000000..2acb75a
--- /dev/null
+++ b/src/io/dir.cpp
@@ -0,0 +1,54 @@
+#include "dir.hpp"
+//    io/dir.cpp - rooted file operations
+//
+//    Copyright © 2014 Ben Longbons <b.r.longbons@gmail.com>
+//
+//    This file is part of The Mana World (Athena server)
+//
+//    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 <http://www.gnu.org/licenses/>.
+
+#include <fcntl.h>
+
+#include "../strings/zstring.hpp"
+
+#include "../poison.hpp"
+
+
+namespace tmwa
+{
+namespace io
+{
+    DirFd::DirFd()
+    : dirfd(FD::cast_dammit(AT_FDCWD))
+    {}
+
+    DirFd::DirFd(ZString path)
+    : dirfd(FD::open(path, O_DIRECTORY | O_RDONLY, 0))
+    {}
+
+    DirFd::DirFd(const DirFd& root, ZString path)
+    : dirfd(FD::openat(root.dirfd, path, O_DIRECTORY | O_RDONLY, 0))
+    {}
+
+    DirFd::~DirFd()
+    {
+        dirfd.close();
+    }
+
+    FD DirFd::open_fd(ZString name, int flags, int mode) const
+    {
+        return FD::openat(dirfd, name, flags, mode);
+    }
+} // namespace io
+} // namespace tmwa
diff --git a/src/io/dir.hpp b/src/io/dir.hpp
new file mode 100644
index 0000000..071f309
--- /dev/null
+++ b/src/io/dir.hpp
@@ -0,0 +1,50 @@
+#pragma once
+//    io/dir.hpp - rooted file operations
+//
+//    Copyright © 2014 Ben Longbons <b.r.longbons@gmail.com>
+//
+//    This file is part of The Mana World (Athena server)
+//
+//    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 <http://www.gnu.org/licenses/>.
+
+#include "fwd.hpp"
+
+#include "../strings/fwd.hpp"
+
+#include "fd.hpp"
+
+
+namespace tmwa
+{
+namespace io
+{
+    class DirFd
+    {
+    private:
+        FD dirfd;
+
+    public:
+        DirFd();
+        explicit
+        DirFd(ZString);
+        DirFd(const DirFd&, ZString);
+
+        DirFd(const DirFd&) = delete;
+        ~DirFd();
+        DirFd& operator = (const DirFd&) = delete;
+
+        FD open_fd(ZString name, int flags, int mode=FD::DEFAULT_MODE) const;
+    };
+} // namespace io
+} // namespace tmwa
diff --git a/src/io/fd.cpp b/src/io/fd.cpp
index 4c61a6f..c0b44e8 100644
--- a/src/io/fd.cpp
+++ b/src/io/fd.cpp
@@ -34,6 +34,10 @@ namespace io
     {
         return FD(::open(path.c_str(), flags, mode));
     }
+    FD FD::openat(FD dirfd, ZString path, int flags, int mode)
+    {
+        return FD(::openat(dirfd.fd, path.c_str(), flags, mode));
+    }
     FD FD::socket(int domain, int type, int protocol)
     {
         return FD(::socket(domain, type, protocol));
diff --git a/src/io/fd.hpp b/src/io/fd.hpp
index 6fb745d..d04d5bf 100644
--- a/src/io/fd.hpp
+++ b/src/io/fd.hpp
@@ -56,8 +56,13 @@ namespace io
         FD stdout() { return FD(1); }
         static
         FD stderr() { return FD(2); }
+
+        static const int DEFAULT_MODE = 0666;
+
         static
-        FD open(ZString path, int flags, int mode=0666);
+        FD open(ZString path, int flags, int mode=DEFAULT_MODE);
+        static
+        FD openat(FD dirfd, ZString path, int flags, int mode=DEFAULT_MODE);
         static
         FD socket(int domain, int type, int protocol);
         FD accept(struct sockaddr *addr, socklen_t *addrlen);
@@ -65,6 +70,7 @@ namespace io
         int pipe(FD& r, FD& w);
         static
         int pipe2(FD& r, FD& w, int flags);
+
         static
         FD sysconf_SC_OPEN_MAX();
 
diff --git a/src/io/read.cpp b/src/io/read.cpp
index d057ca6..3ae5246 100644
--- a/src/io/read.cpp
+++ b/src/io/read.cpp
@@ -42,6 +42,10 @@ namespace io
     : fd(FD::open(name, O_RDONLY | O_CLOEXEC)), start(0), end(0)
     {
     }
+    ReadFile::ReadFile(const DirFd& dir, ZString name)
+    : fd(dir.open_fd(name, O_RDONLY | O_CLOEXEC)), start(0), end(0)
+    {
+    }
     ReadFile::~ReadFile()
     {
         fd.close();
diff --git a/src/io/read.hpp b/src/io/read.hpp
index 6a44de6..1ec26ca 100644
--- a/src/io/read.hpp
+++ b/src/io/read.hpp
@@ -22,6 +22,7 @@
 
 #include "../strings/fwd.hpp"
 
+#include "dir.hpp"
 #include "fd.hpp"
 
 namespace tmwa
@@ -39,6 +40,8 @@ namespace io
         ReadFile(FD fd);
         explicit
         ReadFile(ZString name);
+        ReadFile(const DirFd& dir, ZString name);
+
         ReadFile& operator = (ReadFile&&) = delete;
         ReadFile(ReadFile&&) = delete;
         ~ReadFile();
diff --git a/src/io/write.cpp b/src/io/write.cpp
index 3326d2c..833b173 100644
--- a/src/io/write.cpp
+++ b/src/io/write.cpp
@@ -41,6 +41,9 @@ namespace io
     WriteFile::WriteFile(ZString name, bool linebuffered)
     : fd(FD::open(name, O_WRONLY | O_CREAT | O_TRUNC, 0666)), lb(linebuffered), buflen(0)
     {}
+    WriteFile::WriteFile(const DirFd& dir, ZString name, bool linebuffered)
+    : fd(dir.open_fd(name, O_WRONLY | O_CREAT | O_TRUNC, 0666)), lb(linebuffered), buflen(0)
+    {}
     WriteFile::~WriteFile()
     {
         if (fd != FD())
diff --git a/src/io/write.hpp b/src/io/write.hpp
index 11bc679..1ab05f3 100644
--- a/src/io/write.hpp
+++ b/src/io/write.hpp
@@ -24,6 +24,7 @@
 
 #include "../strings/fwd.hpp"
 
+#include "dir.hpp"
 #include "fd.hpp"
 
 
@@ -43,6 +44,8 @@ namespace io
         WriteFile(FD fd, bool linebuffered=false);
         explicit
         WriteFile(ZString name, bool linebuffered=false);
+        WriteFile(const DirFd& dir, ZString name, bool linebuffered=false);
+
         WriteFile(WriteFile&&) = delete;
         WriteFile& operator = (WriteFile&&) = delete;
         ~WriteFile();