[PATCH] gdb/linux-nat: xfer_memory_partial return E_IO on error

[Lancelot SIX <lancelot.six@amd.com>]

When accessing /proc/PID/mem, if pread64/pwrite64/read/write encounters
an error and return -1, linux_proc_xfer_memory_partial return
TARGET_XFER_EOF.

I think it should return TARGET_XFER_E_IO in this case.  TARGET_XFER_EOF
is returned when pread64/pwrite64/read/frite returns 0, which indicates
that the address space is gone and the whole process has exited or
execed.

This patch makes this change.

Regression tested on x86_64-linux-gnu.

Change-Id: I6030412459663b8d7933483fdda22a6c2c5d7221
---
 gdb/linux-nat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 3b5400896bc..b9164e621db 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -3917,7 +3917,7 @@ linux_proc_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf,
       linux_nat_debug_printf ("accessing fd %d for pid %d failed: %s (%d)",
 			      fd, inferior_ptid.pid (),
 			      safe_strerror (errno), errno);
-      return TARGET_XFER_EOF;
+      return TARGET_XFER_E_IO;
     }
   else if (ret == 0)
     {

base-commit: 51498ab9abc6122817428198e831d36923e293a4
-- 
2.25.1