From c1280bedb0e06d39fbeedb1980ace693b2982b54 Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Wed, 24 Oct 2012 19:52:28 +0200
Subject: [PATCH] Add fchown(2).

---
 libc/Makefile                      |  1 +
 libc/fchown.cpp                    | 35 ++++++++++++++++++++++++++++++
 libc/include/unistd.h              |  2 +-
 sortix/include/sortix/syscallnum.h |  3 ++-
 sortix/io.cpp                      | 10 ++++++++-
 5 files changed, 48 insertions(+), 3 deletions(-)
 create mode 100644 libc/fchown.cpp

diff --git a/libc/Makefile b/libc/Makefile
index 57399489..48dcf069 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -142,6 +142,7 @@ faccessat.o \
 fchdir.o \
 fchmod.o \
 fchownat.o \
+fchown.o \
 fcloseall.o \
 fcntl.o \
 fddir-sortix.o \
diff --git a/libc/fchown.cpp b/libc/fchown.cpp
new file mode 100644
index 00000000..b4344c82
--- /dev/null
+++ b/libc/fchown.cpp
@@ -0,0 +1,35 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2012.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    fchown.cpp
+    Changes the owner and group of a file.
+
+*******************************************************************************/
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+#include <unistd.h>
+
+DEFN_SYSCALL3(int, sys_fchown, SYSCALL_FCHOWN, int, uid_t, gid_t);
+
+extern "C" int fchown(int fd, uid_t owner, gid_t group)
+{
+	return sys_fchown(fd, owner, group);
+}
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 866399c4..d20b506e 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -92,7 +92,6 @@ size_t confstr(int, char*, size_t);
 char* crypt(const char*, const char*);
 char* ctermid(char*);
 void encrypt(char [64], int);
-int fchown(int, uid_t, gid_t);
 int fdatasync(int);
 int fexecve(int, char* const [], char* const []);
 long fpathconf(int, int);
@@ -160,6 +159,7 @@ int execvp(const char*, char* const []);
 pid_t fork(void);
 int faccessat(int, const char*, int, int);
 int fchdir(int);
+int fchown(int, uid_t, gid_t);
 int fchownat(int, const char*, uid_t, gid_t, int);
 int ftruncate(int, off_t);
 char* getcwd(char*, size_t);
diff --git a/sortix/include/sortix/syscallnum.h b/sortix/include/sortix/syscallnum.h
index 26c07234..60cce093 100644
--- a/sortix/include/sortix/syscallnum.h
+++ b/sortix/include/sortix/syscallnum.h
@@ -88,6 +88,7 @@
 #define SYSCALL_FCHDIR 64
 #define SYSCALL_TRUNCATEAT 65
 #define SYSCALL_FCHOWNAT 66
-#define SYSCALL_MAX_NUM 67 /* index of highest constant + 1 */
+#define SYSCALL_FCHOWN 67
+#define SYSCALL_MAX_NUM 68 /* index of highest constant + 1 */
 
 #endif
diff --git a/sortix/io.cpp b/sortix/io.cpp
index 0f1ed73d..146128a8 100644
--- a/sortix/io.cpp
+++ b/sortix/io.cpp
@@ -351,7 +351,14 @@ static int sys_chdir(const char* path)
 	return 0;
 }
 
-// TODO: fchown(2)
+static int sys_fchown(int fd, uid_t owner, gid_t group)
+{
+	Ref<Descriptor> desc = CurrentProcess()->GetDescriptor(fd);
+	if ( !desc )
+		return -1;
+	ioctx_t ctx; SetupUserIOCtx(&ctx);
+	return desc->chown(&ctx, owner, group);
+}
 
 static int sys_fchownat(int dirfd, const char* path, uid_t owner, gid_t group, int flags)
 {
@@ -472,6 +479,7 @@ void Init()
 	Syscall::Register(SYSCALL_FACCESSAT, (void*) sys_faccessat);
 	Syscall::Register(SYSCALL_FCHDIR, (void*) sys_fchdir);
 	Syscall::Register(SYSCALL_FCHOWNAT, (void*) sys_fchownat);
+	Syscall::Register(SYSCALL_FCHOWN, (void*) sys_fchown);
 	Syscall::Register(SYSCALL_FCNTL, (void*) sys_fcntl);
 	Syscall::Register(SYSCALL_FSTATAT, (void*) sys_fstatat);
 	Syscall::Register(SYSCALL_FSTAT, (void*) sys_fstat);