Implemented the pipe() command - ready for the upcoming pipefs implementation.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3675 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/libroot/posix/unistd/Jamfile

@@ -15,6 +15,7 @@ KernelMergeObject posix_unistd.o :
 	<$(SOURCE_GRIST)>lseek.c
 	<$(SOURCE_GRIST)>mount.c
 	<$(SOURCE_GRIST)>open.c
+	<$(SOURCE_GRIST)>pipe.c
 	<$(SOURCE_GRIST)>read.c
 	<$(SOURCE_GRIST)>sleep.c
 	<$(SOURCE_GRIST)>terminal.c

src/kernel/libroot/posix/unistd/pipe.c

@@ -0,0 +1,34 @@
+/* 
+** Copyright 2003, Axel Dörfler, [email protected]. All rights reserved.
+** Distributed under the terms of the OpenBeOS License.
+*/
+
+
+#include <OS.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+
+int
+pipe(int streams[2])
+{
+	// ToDo: if the thread manages to call this function during the
+	//	the same microsecond twice, we're doomed :)
+	char pipeName[64];
+	sprintf(pipeName, "/pipe/%lx-%Ld\n", find_thread(NULL), system_time());
+
+	streams[0] = open(pipeName, O_CREAT | O_RDONLY, 0777);
+	if (streams[0] < 0)
+		return -1;
+
+	streams[1] = open(pipeName, O_WRONLY);
+	if (streams[1] < 0) {
+		close(streams[0]);
+		return -1;
+	}
+
+	return 0;
+}
+