Modules: Move next five of many C files from sched/module to libc/modlib

2026-06-06 16:50:55 +08:00 · 2017-01-29 11:17:29 -06:00
parent 5e94dd22bb
commit 6da66fb5c8
13 changed files with 251 additions and 187 deletions
@@ -0,0 +1,160 @@
+/****************************************************************************
+ * libc/modlib/modlib_read.c
+ *
+ *   Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
+ *   Author: 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <elf32.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/module.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
+ ****************************************************************************/
+
+#if defined(ELF_DUMP_READDATA)
+static inline void modlib_dumpreaddata(FAR char *buffer, int buflen)
+{
+  FAR uint32_t *buf32 = (FAR uint32_t *)buffer;
+  int i;
+  int j;
+
+  for (i = 0; i < buflen; i += 32)
+    {
+      syslog(LOG_DEBUG, "%04x:", i);
+      for (j = 0; j < 32; j += sizeof(uint32_t))
+        {
+          syslog(LOG_DEBUG, "  %08x", *buf32++);
+        }
+
+      syslog(LOG_DEBUG, "\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)
+{
+  ssize_t nbytes;      /* Number of bytes read */
+  off_t   rpos;        /* Position returned by lseek */
+
+  sinfo("Read %ld bytes from offset %ld\n", (long)readsize, (long)offset);
+
+  /* Loop until all of the requested data has been read. */
+
+  while (readsize > 0)
+    {
+      /* Seek to the next read position */
+
+      rpos = lseek(loadinfo->filfd, offset, SEEK_SET);
+      if (rpos != offset)
+        {
+          int errval = errno;
+          serr("ERROR: Failed to seek to position %lu: %d\n",
+               (unsigned long)offset, errval);
+          return -errval;
+        }
+
+      /* Read the file data at offset into the user buffer */
+
+       nbytes = read(loadinfo->filfd, buffer, readsize);
+       if (nbytes < 0)
+         {
+           int errval = errno;
+
+           /* EINTR just means that we received a signal */
+
+           if (errval != EINTR)
+             {
+               serr("ERROR: Read from offset %lu failed: %d\n",
+                    (unsigned long)offset, errval);
+               return -errval;
+             }
+         }
+       else if (nbytes == 0)
+         {
+           serr("ERROR: Unexpected end of file\n");
+           return -ENODATA;
+         }
+       else
+         {
+           readsize -= nbytes;
+           buffer   += nbytes;
+           offset   += nbytes;
+         }
+    }
+
+  modlib_dumpreaddata(buffer, readsize);
+  return OK;
+}