From ab654573e5e3b627839cd4a11ab7e7ce8eef3c44 Mon Sep 17 00:00:00 2001
From: Martin Lenders <mail@martin-lenders.de>
Date: Mon, 30 Sep 2013 15:12:40 +0200
Subject: [PATCH] Implementation of close()
---
sys/posix/include/unistd.h | 49 ++++++++++++++++++++++++++++++++++++++
sys/posix/unistd.c | 30 +++++++++++++++++++++++
2 files changed, 79 insertions(+)
create mode 100644 sys/posix/include/unistd.h
create mode 100644 sys/posix/unistd.c
diff --git a/sys/posix/include/unistd.h b/sys/posix/include/unistd.h
new file mode 100644
index 0000000000..a051e8a144
--- /dev/null
+++ b/sys/posix/include/unistd.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2013 Freie Universität Berlin
+ *
+ * This file subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @addtogroup posix
+ * @{
+ */
+
+/**
+ * @file unistd.h
+ * @brief standard symbolic constants and types
+ * @see <a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html">
+ * The Open Group Base Specifications Issue 7, <unistd.h>
+ * </a>
+ *
+ * @author Freie Universität Berlin
+ * @author Martin Lenders <mlenders@inf.fu-berlin.de>
+ */
+#ifndef _UNISTD_H
+#define _UNISTD_H
+
+/**
+ * @brief Close a file descriptor.
+ * @details shall deallocate the file descriptor indicated by *fildes*. To
+ * deallocate means to make the file descriptor available for return
+ * by subsequent calls to open() or other functions that allocate file
+ * descriptors. All outstanding record locks owned by the process on
+ * the file associated with the file descriptor shall be removed (that
+ * is, unlocked).
+ *
+ * @see <a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/close.html">
+ * The Open Group Base Specification Issue 7, close
+ * </a>
+ *
+ * @param[in] fildes The file descriptor to the file which is to close.
+ * @return Upon successful completion, 0 shall be returned; otherwise, -1
+ * shall be returned and errno set to indicate the error.
+ */
+int close(int fildes);
+
+/**
+ * @}
+ */
+#endif /* _UNISTD_H */
diff --git a/sys/posix/unistd.c b/sys/posix/unistd.c
new file mode 100644
index 0000000000..0030a0d446
--- /dev/null
+++ b/sys/posix/unistd.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2013 Freie Universität Berlin
+ *
+ * This file subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file LICENSE in the top level directory for more
+ * details.
+ */
+#include <errno.h>
+
+#include "fd.h"
+#include "unistd.h"
+
+int close(int fildes)
+{
+ fd_t *fd_obj = fd_get(fildes);
+
+ if (!fd_obj) {
+ errno = EBADF;
+ return -1;
+ }
+
+ if (fd_obj->close(fd_obj->fd) < 0) {
+ errno = EIO; // EINTR may not occur since RIOT has no signals yet.
+ return -1;
+ }
+
+ fd_destroy(fd_obj->fd);
+
+ return 0;
+}
--
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