modify nuttx bug of lack of files

2021-06-11 11:25:07 +08:00
parent 4a7f51a5e9
commit 6d0f2ca39a
6752 changed files with 1528133 additions and 0 deletions
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+/****************************************************************************
+ * include/sys/uio.h
+ *
+ *   Copyright (C) 2017 Grefory Nutt. All rights reserved.
+ *   Copyright (C) 2015 Stavros Polymenis. All rights reserved.
+ *   Author: Stavros Polymenis <sp@orbitalfox.com>
+ *           Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_SYS_UIO_H
+#define __INCLUDE_SYS_UIO_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct iovec
+{
+  FAR void *iov_base;  /* Base address of I/O memory region */
+  size_t    iov_len;   /* Size of the memory pointed to by iov_base */
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: readv()
+ *
+ * Description:
+ *   The readv() function is equivalent to read(), except as described below.
+ *   The readv() function places the input data into the 'iovcnt' buffers
+ *   specified by the members of the 'iov' array: iov[0], iov[1], ...,
+ *   iov['iovcnt'-1].  The 'iovcnt' argument is valid if greater than 0 and
+ *   less than or equal to IOV_MAX as defined in limits.h.
+ *
+ *   Each iovec entry specifies the base address and length of an area in
+ *   memory where data should be placed.  The readv() function will always
+ *   fill an area completely before proceeding to the next.
+ *
+ *   TODO: pon successful completion, readv() will mark for update the
+ *   st_atime field of the file.
+ *
+ * Input Parameters:
+ *   filedes - The open file descriptor for the file to be read
+ *   iov     - Array of read buffer descriptors
+ *   iovcnt  - Number of elements in iov[]
+ *
+ * Returned Value:
+ *   Upon successful completion, readv() will return a non-negative integer
+ *   indicating the number of bytes actually read.  Otherwise, the functions
+ *   will return -1 and set errno to indicate the error.  See read() for the
+ *   list of returned errno values.  In addition, the readv() function will
+ *   fail if:
+ *
+ *    EINVAL.
+ *      The sum of the iov_len values in the iov array overflowed an ssize_t
+ *      or The 'iovcnt' argument was less than or equal to 0, or greater than
+ *      IOV_MAX (Not implemented).
+ *
+ ****************************************************************************/
+
+ssize_t readv(int fildes, FAR const struct iovec *iov, int iovcnt);
+
+/****************************************************************************
+ * Name: writev()
+ *
+ * Description:
+ *   The writev() function is equivalent to write(), except as described
+ *   below. The writev() function will gather output data from the 'iovcnt'
+ *   buffers specified by the members of the 'iov' array: iov[0], iov[1],
+ *   ..., iov[iovcnt-1]. The 'iovcnt' argument is valid if greater than 0
+ *   and less than or equal to IOV_MAX, as defined in limits.h.
+ *
+ *   Each iovec entry specifies the base address and length of an area in
+ *   memory from which data should be written. The writev() function always
+ *   writes a complete area before proceeding to the next.
+ *
+ *   If 'filedes' refers to a regular file and all of the iov_len members in
+ *   the array pointed to by iov are 0, writev() will return 0 and have no
+ *   other effect. For other file types, the behavior is unspecified.
+ *
+ *   TODO: If the sum of the iov_len values is greater than SSIZE_MAX, the
+ *   operation will fail and no data will be transferred.
+ *
+ * Input Parameters:
+ *   filedes - The open file descriptor for the file to be read
+ *   iov     - Array of read buffer descriptors
+ *   iovcnt  - Number of elements in iov[]
+ *
+ * Returned Value:
+ *   Upon successful completion, writev() shall return the number of bytes
+ *   actually written. Otherwise, it shall return a value of -1, the file-
+ *   pointer shall remain unchanged, and errno shall be set to indicate an
+ *   error. See write for the list of returned errno values. In addition,
+ *   the readv() function will fail if:
+ *
+ *    EINVAL.
+ *      The sum of the iov_len values in the iov array overflowed an ssize_t
+ *      or The 'iovcnt' argument was less than or equal to 0, or greater than
+ *      IOV_MAX (Not implemented).
+ *
+ ****************************************************************************/
+
+ssize_t writev(int fildes, FAR const struct iovec *iov, int iovcnt);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __INCLUDE_SYS_UIO_H */