[gcc r14-4687] fortran/intrinsic.texi: Improve SIGNAL intrinsic entry

[Tobias Burnus <burnus@gcc.gnu.org>]

https://gcc.gnu.org/g:43c2f85f52c8400b7204e24400c52c3173c50735

commit r14-4687-g43c2f85f52c8400b7204e24400c52c3173c50735
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Tue Oct 17 18:23:09 2023 +0200

    fortran/intrinsic.texi: Improve SIGNAL intrinsic entry
    
    gcc/fortran/ChangeLog:
    
            * intrinsic.texi (signal): Mention that the argument
            passed to the signal handler procedure is passed by reference.
            Extend example.

Diff:
---
 gcc/fortran/intrinsic.texi | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/gcc/fortran/intrinsic.texi b/gcc/fortran/intrinsic.texi
index 6c7ad03a02c7..0db557d5a38c 100644
--- a/gcc/fortran/intrinsic.texi
+++ b/gcc/fortran/intrinsic.texi
@@ -13168,10 +13168,10 @@ end program test_sign
 @table @asis
 @item @emph{Description}:
 @code{SIGNAL(NUMBER, HANDLER [, STATUS])} causes external subroutine
-@var{HANDLER} to be executed with a single integer argument when signal
-@var{NUMBER} occurs.  If @var{HANDLER} is an integer, it can be used to
-turn off handling of signal @var{NUMBER} or revert to its default
-action.  See @code{signal(2)}.
+@var{HANDLER} to be executed with a single integer argument passed by
+value when signal @var{NUMBER} occurs.  If @var{HANDLER} is an integer,
+it can be used to turn off handling of signal @var{NUMBER} or revert to
+its default action.  See @code{signal(2)}.
 
 If @code{SIGNAL} is called as a subroutine and the @var{STATUS} argument
 is supplied, it is set to the value returned by @code{signal(2)}.
@@ -13197,19 +13197,25 @@ Subroutine, function
 @item @var{STATUS} @tab (Optional) @var{STATUS} shall be a scalar
 integer. It has @code{INTENT(OUT)}.
 @end multitable
-@c TODO: What should the interface of the handler be?  Does it take arguments?
 
 @item @emph{Return value}:
 The @code{SIGNAL} function returns the value returned by @code{signal(2)}.
 
 @item @emph{Example}:
 @smallexample
+module m_handler
+contains
+  ! POSIX.1-2017:  void (*func)(int)
+  subroutine handler_print(signum) bind(C)
+    use iso_c_binding, only: c_int
+    integer(c_int), value :: signum
+    print *, 'handler_print invoked with signum =', signum
+  end subroutine
+end module
 program test_signal
-  intrinsic signal
-  external handler_print
-
-  call signal (12, handler_print)
-  call signal (10, 1)
+  use m_handler
+  call signal (12, handler_print)  ! 12 = SIGUSR2 (on some systems)
+  call signal (10, 1)  ! 10 = SIGUSR1 and 1 = SIG_IGN (on some systems)
 
   call sleep (30)
 end program test_signal