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* [gcc r14-4687] fortran/intrinsic.texi: Improve SIGNAL intrinsic entry
@ 2023-10-17 16:24 Tobias Burnus
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From: Tobias Burnus @ 2023-10-17 16:24 UTC (permalink / raw)
To: gcc-cvs
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
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