From 05196f49b25d704b27e5e97b3af978e945c43d7f Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Thu, 17 Nov 2011 20:34:04 +0100
Subject: [PATCH] Added dup(2).

---
 libmaxsi/c/hsrc/unistd.h | 2 +-
 libmaxsi/io.cpp          | 5 +++++
 sortix/io.cpp            | 9 +++++++++
 sortix/syscallnum.h      | 3 ++-
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/libmaxsi/c/hsrc/unistd.h b/libmaxsi/c/hsrc/unistd.h
index f150ce2b..25e3b506 100644
--- a/libmaxsi/c/hsrc/unistd.h
+++ b/libmaxsi/c/hsrc/unistd.h
@@ -84,7 +84,6 @@ int close(int);
 size_t confstr(int, char*, size_t);
 char* crypt(const char*, const char*);
 char* ctermid(char*);
-int dup(int);
 int dup2(int, int);
 void encrypt(char [64], int);
 int execl(const char*, const char*, ...);
@@ -159,6 +158,7 @@ extern char* optarg;
 extern int opterr, optind, optopt;
 #endif
 
+int dup(int);
 void _exit(int);
 pid_t fork(void);
 pid_t getpid(void);
diff --git a/libmaxsi/io.cpp b/libmaxsi/io.cpp
index 6217652c..0e6126cc 100644
--- a/libmaxsi/io.cpp
+++ b/libmaxsi/io.cpp
@@ -33,6 +33,7 @@ namespace Maxsi
 	DEFN_SYSCALL3(ssize_t, SysRead, 18, int, void*, size_t);
 	DEFN_SYSCALL3(ssize_t, SysWrite, 19, int, const void*, size_t);
 	DEFN_SYSCALL1(int, SysPipe, 20, int*);
+	DEFN_SYSCALL1(int, SysDup, 21, int);
 
 	size_t Print(const char* Message)
 	{
@@ -78,6 +79,10 @@ namespace Maxsi
 		return SysPipe(pipefd);
 	}
 
+	extern "C" int dup(int fd)
+	{
+		return SysDup(fd);
+	}
 #endif
 
 }
diff --git a/sortix/io.cpp b/sortix/io.cpp
index 75bba0f4..f0f7b0be 100644
--- a/sortix/io.cpp
+++ b/sortix/io.cpp
@@ -117,10 +117,19 @@ namespace Sortix
 			return 0;		
 		}
 
+		int SysDup(int fd)
+		{
+			Process* process = CurrentProcess();
+			Device* dev = process->descriptors.Get(fd);
+			if ( !dev ) { return -1; /* TODO: EBADF */ }
+			return process->descriptors.Allocate(dev);
+		}
+
 		void Init()
 		{
 			Syscall::Register(SYSCALL_WRITE, (void*) SysWrite);
 			Syscall::Register(SYSCALL_READ, (void*) SysRead);
+			Syscall::Register(SYSCALL_DUP, (void*) SysDup);
 		}
 	}
 }
diff --git a/sortix/syscallnum.h b/sortix/syscallnum.h
index c420ea7f..73b7708d 100644
--- a/sortix/syscallnum.h
+++ b/sortix/syscallnum.h
@@ -46,7 +46,8 @@
 #define SYSCALL_READ 18
 #define SYSCALL_WRITE 19
 #define SYSCALL_PIPE 20
-#define SYSCALL_MAX_NUM 21 /* index of highest constant + 1 */
+#define SYSCALL_DUP 21
+#define SYSCALL_MAX_NUM 22 /* index of highest constant + 1 */
 
 #endif