131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/****************************************************************************
|
|
* libs/libc/modlib/modlib_read.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <inttypes.h>
|
|
#include <stdint.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <debug.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/fs/fs.h>
|
|
#include <nuttx/lib/modlib.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#undef ELF_DUMP_READDATA /* Define to dump all file data read */
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: modlib_dumpreaddata
|
|
****************************************************************************/
|
|
|
|
#ifdef ELF_DUMP_READDATA
|
|
# define modlib_dumpreaddata(b,n) binfodumpbuffer("modlib_read",b,n)
|
|
#else
|
|
# define modlib_dumpreaddata(b,n)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: modlib_read
|
|
*
|
|
* Description:
|
|
* Read 'readsize' bytes from the object file at 'offset'. The data is
|
|
* read into 'buffer.'
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int modlib_read(FAR struct mod_loadinfo_s *loadinfo, FAR uint8_t *buffer,
|
|
size_t readsize, off_t offset)
|
|
{
|
|
size_t nsize = readsize;
|
|
ssize_t nbytes; /* Number of bytes read */
|
|
off_t rpos; /* Position returned by lseek */
|
|
int errval;
|
|
|
|
binfo("Read %zu bytes from offset %" PRIdOFF "\n", readsize, offset);
|
|
|
|
/* Loop until all of the requested data has been read. */
|
|
|
|
/* Seek to the read position */
|
|
|
|
rpos = _NX_SEEK(loadinfo->filfd, offset, SEEK_SET);
|
|
if (rpos != offset)
|
|
{
|
|
errval = _NX_GETERRNO(rpos);
|
|
berr("ERROR: Failed to seek to position %" PRIdOFF ": %d\n",
|
|
offset, errval);
|
|
return -errval;
|
|
}
|
|
|
|
while (readsize > 0)
|
|
{
|
|
/* Read the file data at offset into the user buffer */
|
|
|
|
nbytes = _NX_READ(loadinfo->filfd,
|
|
buffer + nsize - readsize, readsize);
|
|
if (nbytes < 0)
|
|
{
|
|
errval = _NX_GETERRNO(nbytes);
|
|
|
|
/* EINTR just means that we received a signal */
|
|
|
|
if (errval != EINTR)
|
|
{
|
|
berr("ERROR: Read from offset %" PRIdOFF " failed: %d\n",
|
|
(off_t)(offset + nsize - readsize), errval);
|
|
return -errval;
|
|
}
|
|
}
|
|
else if (nbytes == 0)
|
|
{
|
|
berr("ERROR: Unexpected end of file\n");
|
|
return -ENODATA;
|
|
}
|
|
else
|
|
{
|
|
readsize -= nbytes;
|
|
}
|
|
}
|
|
|
|
modlib_dumpreaddata(buffer, nsize);
|
|
return OK;
|
|
}
|