ChangeLog:

	* inf-child.c (inf_child_fileio_pwrite): If pwrite fails, fall back
	to attempting lseek/write.
	(inf_child_fileio_pread): Likewise for pread.

gdbserver/ChangeLog:

	* hostio.c (handle_pread): If pread fails, fall back to attempting
	lseek/read.
	(handle_pwrite): Likewise for pwrite.

4 files changed, 44 insertions, 12 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index f284746..b4c1545 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2012-08-02  Ulrich Weigand  <ulrich.weigand@linaro.org>
+
+	* inf-child.c (inf_child_fileio_pwrite): If pwrite fails, fall back
+	to attempting lseek/write.
+	(inf_child_fileio_pread): Likewise for pread.
+
 2012-08-02  Yao Qi  <yao@codesourcery.com>
 
 	* dwarf2loc.c (entry_values_debug): Add 'unsigned'.
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 6a1259b..d446361 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,9 @@
+2012-08-02  Ulrich Weigand  <ulrich.weigand@linaro.org>
+
+	* hostio.c (handle_pread): If pread fails, fall back to attempting
+	lseek/read.
+	(handle_pwrite): Likewise for pwrite.
+
 2012-08-01  Ulrich Weigand  <ulrich.weigand@linaro.org>
 
 	* linux-arm-low.c (arm_linux_hw_point_initialize): Distinguish
diff --git a/gdb/gdbserver/hostio.c b/gdb/gdbserver/hostio.c
index 03aab58..72e334c 100644
--- a/gdb/gdbserver/hostio.c
+++ b/gdb/gdbserver/hostio.c
@@ -328,10 +328,15 @@ handle_pread (char *own_buf, int *new_packet_len)
 #ifdef HAVE_PREAD
   ret = pread (fd, data, len, offset);
 #else
-  ret = lseek (fd, offset, SEEK_SET);
-  if (ret != -1)
-    ret = read (fd, data, len);
+  ret = -1;
 #endif
+  /* If we have no pread or it failed for this file, use lseek/read.  */
+  if (ret == -1)
+    {
+      ret = lseek (fd, offset, SEEK_SET);
+      if (ret != -1)
+	ret = read (fd, data, len);
+    }
 
   if (ret == -1)
     {
@@ -376,10 +381,15 @@ handle_pwrite (char *own_buf, int packet_len)
 #ifdef HAVE_PWRITE
   ret = pwrite (fd, data, len, offset);
 #else
-  ret = lseek (fd, offset, SEEK_SET);
-  if (ret != -1)
-    ret = write (fd, data, len);
+  ret = -1;
 #endif
+  /* If we have no pwrite or it failed for this file, use lseek/write.  */
+  if (ret == -1)
+    {
+      ret = lseek (fd, offset, SEEK_SET);
+      if (ret != -1)
+	ret = write (fd, data, len);
+    }
 
   if (ret == -1)
     {
diff --git a/gdb/inf-child.c b/gdb/inf-child.c
index 54e65c5..ae2dd1e 100644
--- a/gdb/inf-child.c
+++ b/gdb/inf-child.c
@@ -265,10 +265,15 @@ inf_child_fileio_pwrite (int fd, const gdb_byte *write_buf, int len,
 #ifdef HAVE_PWRITE
   ret = pwrite (fd, write_buf, len, (long) offset);
 #else
-  ret = lseek (fd, (long) offset, SEEK_SET);
-  if (ret != -1)
-    ret = write (fd, write_buf, len);
+  ret = -1;
 #endif
+  /* If we have no pwrite or it failed for this file, use lseek/write.  */
+  if (ret == -1)
+    {
+      ret = lseek (fd, (long) offset, SEEK_SET);
+      if (ret != -1)
+	ret = write (fd, write_buf, len);
+    }
 
   if (ret == -1)
     *target_errno = inf_child_errno_to_fileio_error (errno);
@@ -288,10 +293,15 @@ inf_child_fileio_pread (int fd, gdb_byte *read_buf, int len,
 #ifdef HAVE_PREAD
   ret = pread (fd, read_buf, len, (long) offset);
 #else
-  ret = lseek (fd, (long) offset, SEEK_SET);
-  if (ret != -1)
-    ret = read (fd, read_buf, len);
+  ret = -1;
 #endif
+  /* If we have no pread or it failed for this file, use lseek/read.  */
+  if (ret == -1)
+    {
+      ret = lseek (fd, (long) offset, SEEK_SET);
+      if (ret != -1)
+	ret = read (fd, read_buf, len);
+    }
 
   if (ret == -1)
     *target_errno = inf_child_errno_to_fileio_error (errno);