Re: [PATCH] Fix attach-twice.c testcase for AIX.

[Aditya Kamath1 <Aditya.Kamath1@ibm.com>]

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Respected Ulrich and community members,

Please find attached the patch. (See: 0001-Fix-attach-twice.c-testcase-for-AIX.patch)

>- It doesn't seem really useful to introduce the PTRACE_FUNC macro;
  >just put the #ifdef _AIX directly in place instead.

We now have this.

>- In addition to the fifth argument, your patch also changes ptrace to
 >ptrace64 - is that necessary?  If not, it seems leaving it as ptrace
 > would be less surprising.

Yes it is. Thank you for reminding me. As per this document (https://www.ibm.com/docs/en/aix/7.2?topic=p-ptrace-ptracex-ptrace64-subroutine) we will need to keep it as ptrace64 if we execute in 64 bit mode. So I have taken care of the same in this version of the patch.

Kindly let me know if this version is okay.

Have a nice day ahead.

Thanks and regards,
Aditya.



From: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
Date: Thursday, 25 January 2024 at 4:59 PM
To: gdb-patches@sourceware.org <gdb-patches@sourceware.org>, Aditya Kamath1 <Aditya.Kamath1@ibm.com>
Cc: Sangamesh Mallayya <sangamesh.swamy@in.ibm.com>
Subject: Re: [PATCH] Fix attach-twice.c testcase for AIX.
Aditya Kamath1 <Aditya.Kamath1@ibm.com> wrote:

>This is a small fix to resolve the attach-twice untested test case in AIX.
>Currently we are getting an error
>
>gdb/testsuite/gdb.base/attach-twice.c:43:7: error: too few arguments to function 'ptrace'
>
>which is why this testcase is untested. In AIX, we use 5 arguments for ptrace.

I see.  I guess the change is reasonable, however:

- It doesn't seem really useful to introduce the PTRACE_FUNC macro;
  just put the #ifdef _AIX directly in place instead.

- In addition to the fifth argument, your patch also changes ptrace to
  ptrace64 - is that necessary?  If not, it seems leaving it as ptrace
  would be less surprising.

Bye,
Ulrich

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From 9b2deb724046d86e9744db6b90bb94756eb666b7 Mon Sep 17 00:00:00 2001
From: Aditya Vidyadhar Kamath <Aditya.Kamath1@ibm.com>
Date: Thu, 25 Jan 2024 06:28:29 -0600
Subject: [PATCH] Fix attach-twice.c testcase for AIX.

Currently, in AIX attach-twice.exp testcase is untested due to the below error.
gdb/testsuite/gdb.base/attach-twice.c:43:7: error: too few arguments to function 'ptrace'

This is because in AIX ptrace has five arguments. This patch is a fix for the same such that
this test case runs in AIX and other targets as well.
---
 gdb/testsuite/gdb.base/attach-twice.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gdb/testsuite/gdb.base/attach-twice.c b/gdb/testsuite/gdb.base/attach-twice.c
index ecb882a0e7b..7b0af35a566 100644
--- a/gdb/testsuite/gdb.base/attach-twice.c
+++ b/gdb/testsuite/gdb.base/attach-twice.c
@@ -38,9 +38,15 @@ main (void)
       exit (1);
     case 0:
       errno = 0;
+      #if defined(_AIX) && defined (__64BIT__)
+      ptrace64 (PTRACE_ATTACH, getppid (), NULL, 0, NULL);
+      #elif defined(_AIX) && !defined (__64BIT__)
+      ptrace (PTRACE_ATTACH, getppid (), NULL, 0, NULL);
+      #else
       /* The 4th argument to ptrace () is 0 on purpose, as it is compatible
 	 between kernels that accept void* (like Linux) and int (NetBSD).  */
       ptrace (PTRACE_ATTACH, getppid (), NULL, 0);
+      #endif
       if (errno != 0)
 	perror ("PTRACE_ATTACH");
       break;
-- 
2.41.0