| /**************************************************************************** |
| * 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; |
| } |