From 60f2ae4d3cee0cbf200a89df21a3949c92125cf4 Mon Sep 17 00:00:00 2001
From: zhangjun <2281979437@qq.com>
Date: Thu, 26 Sep 2019 10:22:33 +0800
Subject: [PATCH 1/4] =?UTF-8?q?[components][dfs]=E6=B7=BB=E5=8A=A0ftruncat?=
 =?UTF-8?q?e=E6=8E=A5=E5=8F=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 components/dfs/filesystems/elmfat/dfs_elm.c | 25 +++++++++++
 components/dfs/include/dfs_file.h           |  4 ++
 components/dfs/include/dfs_posix.h          |  1 +
 components/dfs/src/dfs_file.c               | 29 +++++++++++++
 components/dfs/src/dfs_posix.c              | 46 +++++++++++++++++++++
 5 files changed, 105 insertions(+)

diff --git a/components/dfs/filesystems/elmfat/dfs_elm.c b/components/dfs/filesystems/elmfat/dfs_elm.c
index 3825fd9108..b6d2c2388a 100644
--- a/components/dfs/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/filesystems/elmfat/dfs_elm.c
@@ -478,6 +478,31 @@ int dfs_elm_close(struct dfs_fd *file)
 
 int dfs_elm_ioctl(struct dfs_fd *file, int cmd, void *args)
 {
+    switch (cmd)
+    {
+    case RT_FIOFTRUNCATE:
+        {
+            FIL *fd;
+            FSIZE_t fptr, length;
+            FRESULT result = FR_OK;
+            fd = (FIL *)(file->data);
+            RT_ASSERT(fd != RT_NULL);
+
+            /* save file read/write point */
+            fptr = fd->fptr;
+            length = *(off_t*)args;
+            if (length <= fd->obj.objsize)
+            {
+                fd->fptr = length;
+                result = f_truncate(fd);
+            }else{
+                result = f_lseek(fd, length);
+            }
+            /* restore file read/write point */
+            fd->fptr = fptr;
+            return elm_result_to_dfs(result);
+        }
+    }
     return -ENOSYS;
 }
 
diff --git a/components/dfs/include/dfs_file.h b/components/dfs/include/dfs_file.h
index aaff3f6e9c..2dfacd653e 100644
--- a/components/dfs/include/dfs_file.h
+++ b/components/dfs/include/dfs_file.h
@@ -66,6 +66,10 @@ int dfs_file_lseek(struct dfs_fd *fd, off_t offset);
 
 int dfs_file_stat(const char *path, struct stat *buf);
 int dfs_file_rename(const char *oldpath, const char *newpath);
+int dfs_file_ftruncate(struct dfs_fd *fd, off_t length);
+
+/* 0x5254 is just a magic number to make these relatively unique ("RT") */
+#define RT_FIOFTRUNCATE 0x52540000U
 
 #ifdef __cplusplus
 }
diff --git a/components/dfs/include/dfs_posix.h b/components/dfs/include/dfs_posix.h
index 9fd76debe2..87d5f0771e 100644
--- a/components/dfs/include/dfs_posix.h
+++ b/components/dfs/include/dfs_posix.h
@@ -58,6 +58,7 @@ int fstat(int fildes, struct stat *buf);
 int fsync(int fildes);
 int fcntl(int fildes, int cmd, ...);
 int ioctl(int fildes, int cmd, ...);
+int ftruncate(int fd, off_t length);
 
 /* directory api*/
 int rmdir(const char *path);
diff --git a/components/dfs/src/dfs_file.c b/components/dfs/src/dfs_file.c
index 5f090a7f6b..1063a278ab 100644
--- a/components/dfs/src/dfs_file.c
+++ b/components/dfs/src/dfs_file.c
@@ -482,6 +482,35 @@ __exit:
     return result;
 }
 
+/**
+ * this function is will cause the regular file referenced by fd
+ * to be truncated to a size of precisely length bytes.
+ *
+ * @param fd the file descriptor.
+ * @param length the length to be truncated.
+ *
+ * @return the status of truncated.
+ */
+int dfs_file_ftruncate(struct dfs_fd *fd, off_t length)
+{
+    int result;
+
+    /* fd is null or not a regular file system fd, or length is invalid */
+    if (fd == NULL || fd->type != FT_REGULAR || length < 0)
+        return -EINVAL;
+
+    if (fd->fops->ioctl == NULL)
+        return -ENOSYS;
+
+    result = fd->fops->ioctl(fd, RT_FIOFTRUNCATE, (void*)&length);
+
+    /* update current size */
+    if (result == 0)
+        fd->size = length;
+
+    return result;
+}
+
 #ifdef RT_USING_FINSH
 #include <finsh.h>
 
diff --git a/components/dfs/src/dfs_posix.c b/components/dfs/src/dfs_posix.c
index 69fe56a84e..fc603df437 100644
--- a/components/dfs/src/dfs_posix.c
+++ b/components/dfs/src/dfs_posix.c
@@ -471,6 +471,52 @@ int ioctl(int fildes, int cmd, ...)
 }
 RTM_EXPORT(ioctl);
 
+/**
+ *
+ * this function is a POSIX compliant version, which cause the regular file
+ * referenced by fd to be truncated to a size of precisely length bytes.
+ * @param fd the file descriptor.
+ * @param length the length to be truncated.
+ *
+ * @return Upon successful completion, ftruncate() shall return 0;
+ * otherwise, -1 shall be returned and errno set to indicate the error.
+ */
+int ftruncate(int fd, off_t length)
+{
+    int result;
+    struct dfs_fd *d;
+
+    d = fd_get(fd);
+    if (d == NULL)
+    {
+        rt_set_errno(-EBADF);
+
+        return -1;
+    }
+
+    if (length < 0)
+    {
+        fd_put(d);
+        rt_set_errno(-EINVAL);
+
+        return -1;
+    }
+    result = dfs_file_ftruncate(d, length);
+    if (result < 0)
+    {
+        fd_put(d);
+        rt_set_errno(result);
+
+        return -1;
+    }
+
+    /* release the ref-count of fd */
+    fd_put(d);
+
+    return 0;
+}
+RTM_EXPORT(ftruncate);
+
 /**
  * this function is a POSIX compliant version, which will return the
  * information about a mounted file system.

From 8ed3daed5f1b5fb411b4ca01f5e367b715db12d3 Mon Sep 17 00:00:00 2001
From: zhangjun <2281979437@qq.com>
Date: Thu, 26 Sep 2019 11:27:37 +0800
Subject: [PATCH 2/4] =?UTF-8?q?[components][libc][compilers][newlib]?=
 =?UTF-8?q?=E6=B7=BB=E5=8A=A0getuid=E5=92=8Cumask=E5=87=BD=E6=95=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 components/libc/compilers/newlib/syscalls.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/components/libc/compilers/newlib/syscalls.c b/components/libc/compilers/newlib/syscalls.c
index 9919e11727..24506476c6 100644
--- a/components/libc/compilers/newlib/syscalls.c
+++ b/components/libc/compilers/newlib/syscalls.c
@@ -442,3 +442,14 @@ void abort(void)
 
     while (1);
 }
+
+uid_t getuid(void)
+{
+    return 0;
+}
+
+mode_t umask(mode_t mask)
+{
+    return 022;
+}
+

From f7e7170536324f7ecce68e2bbf56607f15926fa4 Mon Sep 17 00:00:00 2001
From: zhangjun <2281979437@qq.com>
Date: Thu, 26 Sep 2019 14:34:59 +0800
Subject: [PATCH 3/4] =?UTF-8?q?[components][libc][compilers][newlib]?=
 =?UTF-8?q?=E6=B7=BB=E5=8A=A0flock=E6=8E=A5=E5=8F=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 components/libc/compilers/newlib/syscalls.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/libc/compilers/newlib/syscalls.c b/components/libc/compilers/newlib/syscalls.c
index 24506476c6..59c1881ad1 100644
--- a/components/libc/compilers/newlib/syscalls.c
+++ b/components/libc/compilers/newlib/syscalls.c
@@ -453,3 +453,7 @@ mode_t umask(mode_t mask)
     return 022;
 }
 
+int flock(int fd, int operation)
+{
+    return 0;
+}

From d08f53365994a2cf0bfe446c27ba3fe59706f2fc Mon Sep 17 00:00:00 2001
From: zhangjun <2281979437@qq.com>
Date: Tue, 8 Oct 2019 09:11:35 +0800
Subject: [PATCH 4/4] =?UTF-8?q?[components][dfs][filesystems][elmfat]?=
 =?UTF-8?q?=E4=BF=AE=E6=AD=A3=E4=BB=A3=E7=A0=81=E9=A3=8E=E6=A0=BC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 components/dfs/filesystems/elmfat/dfs_elm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/components/dfs/filesystems/elmfat/dfs_elm.c b/components/dfs/filesystems/elmfat/dfs_elm.c
index b6d2c2388a..b4c4c627aa 100644
--- a/components/dfs/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/filesystems/elmfat/dfs_elm.c
@@ -495,7 +495,9 @@ int dfs_elm_ioctl(struct dfs_fd *file, int cmd, void *args)
             {
                 fd->fptr = length;
                 result = f_truncate(fd);
-            }else{
+            }
+            else
+            {
                 result = f_lseek(fd, length);
             }
             /* restore file read/write point */