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Date:   Sat, 24 Nov 2018 15:54:02 -1000
From:   Joey Pabalinas <joeypabalinas@gmail.com>
To:     Elvira Khabirova <lineprinter@altlinux.org>
Cc:     oleg@redhat.com, rostedt@goodmis.org, mingo@redhat.com,
        linux-api@vger.kernel.org, esyr@redhat.com,
        linux-kernel@vger.kernel.org, luto@kernel.org, ldv@altlinux.org,
        strace-devel@lists.strace.io,
        Joey Pabalinas <joeypabalinas@gmail.com>
Subject: Re: [PATCH RESEND v3 1/3] ptrace: pass type of a syscall-stop in
 ptrace_message
Message-ID: <20181125015402.glcaw3kghcu4pr22@gmail.com>
Mail-Followup-To: Joey Pabalinas <joeypabalinas@gmail.com>,
        Elvira Khabirova <lineprinter@altlinux.org>, oleg@redhat.com,
        rostedt@goodmis.org, mingo@redhat.com, linux-api@vger.kernel.org,
        esyr@redhat.com, linux-kernel@vger.kernel.org, luto@kernel.org,
        ldv@altlinux.org, strace-devel@lists.strace.io
References: <20181125022150.46258a20@akathisia>
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On Sun, Nov 25, 2018 at 02:22:27AM +0100, Elvira Khabirova wrote:
> Define two constants, PTRACE_EVENTMSG_SYSCALL_ENTRY and
> PTRACE_EVENTMSG_SYSCALL_EXIT, and place them in ptrace_message
> for the duration of syscall-stops.
> This way ptracers can distinguish syscall-enter-stops
> from syscall-exit-stops using PTRACE_GETEVENTMSG request.

Is there an advantage to using two constants instead of a single
sys_exit bit (set/unset for syscall-exit-stop/syscall-enter-stop)?

--=20
Cheers,
Joey Pabalinas

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