Cool! the ARGV method you suggested works just fine. I would not be able to figure that out from perlembed. Thanks.

And you were right about buffering. Ending the message with a line feed fixed that. So now I get the sighandler message BUT still the Perl code terminates even if Perl's sighandler has no die() and is meant to just ignore it/print message.

Update: just a warning that an infinite loop ensues if argc==0

Update2: of course argc is always > 0.

Update3: it turns out one can send parameters to perl -e ... using perl -e 'print join(",",@ARGV)."\n"' -- -a -b -c 12, ikegami adds -- before any user-specified arguments to perl.

Update4: I have changed perlargv[i+3] to perlargv[i+4] so that -- is not overwritten.

Update5: kschwab found out why ctrl-c kills the program (because of the long sleep, sleep(1000)),

Update6: based on all the suggestions by ikegami and kschwab, this works for me:

/* harness for embedding Perl into C
   modified by Bliako
    from https://perldoc.perl.org/perlembed.html
   Compile:
    $(perl -MConfig -e 'print $Config{cc}') perl_embed_argv_signal.c $
+(perl -MExtUtils::Embed -e ccopts -e ldopts) -o perl_embed_argv_signa
+l
   30/01/2019
*/
#include <stdio.h>
#include <signal.h>
#include <EXTERN.h>    /* from the Perl distribution     */
#include <perl.h>    /* from the Perl distribution     */
 
static PerlInterpreter *my_perl;  /***    The Perl interpreter    ***/

void cleanup(void);
//let perl handle it
void signal_handler(int signum){ printf("got signal %d\n", signum); }

int main(int argc, char **argv, char **env){
    signal(SIGINT, signal_handler);
    PERL_SYS_INIT3(&argc,&argv,&env);
    my_perl = perl_alloc();
    printf("%s : perl_alloc()\n", argv[0]);
    perl_construct(my_perl);
    printf("%s : perl_construct()\n", argv[0]);
    PL_exit_flags |= PERL_EXIT_DESTRUCT_END;

    char** perlargv = malloc( (argc+3) * sizeof(char*) );
    perlargv[0] = "perl";
    perlargv[1] = "-e";
    perlargv[2] = "1";
    perlargv[3] = "--";

    int i = argc-1;
    while (i--) perlargv[i+4] = argv[i+1];

    perl_parse(my_perl, NULL, argc+3, perlargv, NULL);

    const char perlcode[] =
"#$SIG{INT} = sub { print \"Caught your ctrl-c and exiting!\\n\"; exit
+(0); };\n"
"$SIG{INT} = sub { print \"Caught your ctrl-c but ignoring it!\\n\" };
+\n"
"print \"$0: ARGV:\"; print ' '.$_ foreach(@ARGV); print \"\\n\";\n"
"print \"my pid $$\\n\";\n"
"print \"now sleeping, and you ctrl-c me\\n\";\n"
"for(1..100){sleep(1);print\"$_\\n\";}\n"
;
    printf("%s : executing :\n%s\n", argv[0], perlcode);
    SV *ret = eval_pv(perlcode, FALSE);
    if( SvTRUE(ERRSV) ){ fprintf(stderr, "%s : eval_sv() has failed wi
+th:\n%s\nfor the code:\n%s\n", argv[0], SvPVx_nolen(ERRSV), perlcode)
+; cleanup(); exit(1); }

    printf("%s : done.\n", argv[0]);
    exit(EXIT_SUCCESS);
}
void cleanup(void){
    perl_destruct(my_perl);
    perl_free(my_perl);
    PERL_SYS_TERM();
}

[download]

In reply to Re^2: Pass signals and argv from C to embedded Perl by bliako
in thread Pass signals and argv from C to embedded Perl by bliako

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.