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manual: Update signal descriptions (RHEL-67593)

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Resolves: RHEL-67593
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DJ Delorie 2025-02-18 18:11:02 -05:00
parent cadb5c6bdc
commit 0d550037a2
2 changed files with 90 additions and 1 deletions
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glibc-RHEL-67593.patch Normal file
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@ -0,0 +1,85 @@
From bb6496b96444dfd55d7105396780f6eba14b1cd9 Mon Sep 17 00:00:00 2001
From: DJ Delorie <dj@redhat.com>
Date: Fri, 17 Jan 2025 17:34:02 -0500
Subject: manual: Update signal descriptions
Based on auditing all the signals and source trees for Hurd and
Linux...
SIGSYS - This is not used for a bad system call (ENOSYS is used
for that). This is used by SECCOMP and some cases where an invalid
sub-function was requested.
SIGSTKFLT - Note it used to be a coprocessor stack fault but is now
obsolete and available for general user use.
SIGLOST - Hurd only now; note that its original purpose as an NFS
lock lost signal is obsolete.
SIGPWR - Note this is for power lost *and* power restored, and is
more a user-mode signal than a kernel-generated signal.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
diff --git a/manual/signal.texi b/manual/signal.texi
index 2012980efe..842b4e49a2 100644
--- a/manual/signal.texi
+++ b/manual/signal.texi
@@ -427,9 +427,18 @@ failure to properly emulate them.
@deftypevr Macro int SIGSYS
@standards{Unix, signal.h}
-Bad system call; that is to say, the instruction to trap to the
-operating system was executed, but the code number for the system call
-to perform was invalid.
+System call event. This signal may be generated by a valid system
+call which requested an invalid sub-function, and also by the SECCOMP
+filter when it filters or traps a system call.
+
+If the system call itself is invalid or unsupported by the kernel, the
+call will not raise this signal, but will return @code{ENOSYS}.
+@end deftypevr
+
+@deftypevr Macro int SIGSTKFLT
+Coprocessor stack fault. Obsolete, no longer generated. This signal
+may be used by applications in much the way @code{SIGUSR1} and
+@code{SIGUSR2} are.
@end deftypevr
@node Termination Signals
@@ -752,12 +761,11 @@ that isn't connected. @xref{Sending Data}.
@deftypevr Macro int SIGLOST
@standards{GNU, signal.h}
@cindex lost resource signal
-Resource lost. This signal is generated when you have an advisory lock
-on an NFS file, and the NFS server reboots and forgets about your lock.
-
-On @gnuhurdsystems{}, @code{SIGLOST} is generated when any server program
-dies unexpectedly. It is usually fine to ignore the signal; whatever
-call was made to the server that died just returns an error.
+Resource lost. On @gnuhurdsystems{}, @code{SIGLOST} is generated when
+any server program dies unexpectedly. It is usually fine to ignore
+the signal; whatever call was made to the server that died just
+returns an error. This signal's original purpose of signalling a lost
+NFS lock is obsolete.
@end deftypevr
@deftypevr Macro int SIGXCPU
@@ -817,6 +825,17 @@ to print some status information about the system and what the process
is doing. Otherwise the default is to do nothing.
@end deftypevr
+@deftypevr Macro int SIGPWR
+@cindex power event signal
+Power lost or restored. On s390x Linux systems, this signal is
+generated when a machine check warning is issued, and is sent to the
+process designated to receive ctrl-alt-del notifications. Otherwise,
+it is up to userspace applications to generate this signal and manage
+notifications as to the type of power event that happened.
+
+The default action is to terminate the process.
+@end deftypevr
+
@node Signal Messages
@subsection Signal Messages
@cindex signal messages

6
glibc.spec
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@ -157,7 +157,7 @@ end \
Summary: The GNU libc libraries
Name: glibc
Version: %{glibcversion}
Release: 169%{?dist}
Release: 170%{?dist}
# In general, GPLv2+ is used by programs, LGPLv2+ is used for
# libraries.
@ -1119,6 +1119,7 @@ Patch811: glibc-RHEL-57585-2.patch
Patch812: glibc-RHEL-57585-3.patch
Patch813: glibc-RHEL-57585-4.patch
Patch814: glibc-RHEL-57585-5.patch
Patch815: glibc-RHEL-67593.patch
##############################################################################
# Continued list of core "glibc" package information:
@ -3112,6 +3113,9 @@ update_gconv_modules_cache ()
%endif
%changelog
* Fri Feb 28 2025 DJ Delorie <dj@redhat.com> - 2.34-170
- manual: Update signal descriptions (RHEL-67593)
* Fri Feb 14 2025 Tulio Magno Quites Machado Filho <tuliom@redhat.com> - 2.34-169
- Backport documentation for time functions (RHEL-57585)