Re: [man-pages PATCH 2/5] s390_runtime_instr.2: document the removal of the second argument

On Wed, Jan 31, 2018 at 08:41:39AM +0000, Eugene Syromyatnikov wrote:

On Wed, Jan 31, 2018 at 7:20 AM, Heiko Carstens
[off-list ref] wrote:

quoted

@@ -85,6 +91,12 @@ The run-time instrumentation facility is available beginning with System z EC12.
 Glibc does not provide a wrapper for this system call, use
 .BR syscall (2)
 to call it.
+.PP
+Support for signalling was removed with Linux 4.4. With Linux 4.4
+also the check if
+.IR signum
+is a valid real-time signal was removed. For backwards compatibility with old
+kernels it is recommended to pass a valid real-time signal number.

I would recommend passing 0 instead, as passing non-zero signal number
implies that the userspace process expects to receive this signal in
the future in case of aforementioned events, and this will not happen
on Linux 4.4 onwards.

Passing 0 as signum is not backwards compatible, since that will result in
an error with old kernels.

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