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wr.c (C wrapper):

...
   sArgv[4] = 0;
   execv("/usr/bin/perl", sArgv);
}

Example Perl script t1.pl:

...
print "arg1='$arg1'\n";
dump_user_details($<);
dump_user_details($>) if $> != $<;

cc -o wr wr.c
chown root wr t1.pl
...
chmod 4710 wr
./wr test