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Re: [PATCH] sig_num, etc.

Gurusamy Sarathy
March 13, 2003 23:41
Re: [PATCH] sig_num, etc.
Message ID:
On Fri, 14 Mar 2003 01:07:56 CST, "Craig A. Berry" wrote:
>You may be right, but after an hour or two I gave up trying to figure
>out what the comments in config_h.SH and the docs in Porting/Glossary
>were trying to tell me and went with what I thought Configure was
>actually doing.  One of the confusing things is that the SIG_NUM
>macro in config_h.SH derives from the sig_num_init variable in
>, not from sig_num.  So when the comments in config_h.SH say
>that SIG_NUM should be comma-separated, that means
>$Config{sig_num_init} should be comma-separated, but says nothing at
>all about $Config{sig_num}.  $Config{sig_num} and
>$Config{sig_num_init} are apparently two different views of the same
>data, the former to be viewed from Perl, and the latter for
>constructing the SIG_NUM macro in config.h for C and XS.

Porting/Glossary is quite clear, IMO:

:sig_num (sig_name.U):
:        This variable holds the signal numbers, space separated. A ZERO is
:        prepended to the list (corresponding to the fake SIGZERO), and
:        the list is terminated with a 0.  Those numbers correspond to
:        the value of the signal listed in the same place within the
:        sig_name list.
:sig_num_init (sig_name.U):
:        This variable holds the signal numbers, enclosed in double quotes and
:        separated by commas, suitable for use in the SIG_NUM definition
:        below.  A "ZERO" is prepended to the list, and the list is
:        terminated with a plain 0.
:sig_size (sig_name.U):
:        This variable contains the number of elements of the sig_name
:        and sig_num arrays, excluding the final NULL entry.

Note that both sig_num and sig_num_init have the "terminated with a 0".
The sig_size definition clearly says "excluding the final NULL", so
I don't think there is any ambiguity here: split(' ', $sig_num)
should yield $sig_size+1 elements according the above, but the test
wasn't doing that before change#18967.

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