focal (3) FFI::Platypus::Memory.3pm.gz

NAME

       FFI::Platypus::Memory - Memory functions for FFI

VERSION

       version 1.10

SYNOPSIS

        use FFI::Platypus::Memory;

        # allocate 64 bytes of memory using the
        # libc malloc function.
        my $pointer = malloc 64;

        # use that memory wisely
        ...

        # free the memory when you are done.
        free $pointer;

DESCRIPTION

       This module provides an interface to common memory functions provided by the standard C library.  They
       may be useful when constructing interfaces to C libraries with FFI.  It works mostly with the "opaque"
       type and it is worth reviewing the section on opaque pointers in FFI::Platypus::Type.

FUNCTIONS

   calloc
        my $pointer = calloc $count, $size;

       The "calloc" function contiguously allocates enough space for $count objects that are $size bytes of
       memory each.

   free
        free $pointer;

       The "free" function frees the memory allocated by "malloc", "calloc", "realloc" or "strdup".  It is
       important to only free memory that you yourself have allocated.  A good way to crash your program is to
       try and free a pointer that some C library has returned to you.

   malloc
        my $pointer = malloc $size;

       The "malloc" function allocates $size bytes of memory.

   memcpy
        memcpy $dst_pointer, $src_pointer, $size;

       The "memcpy" function copies $size bytes from $src_pointer to $dst_pointer.  It also returns
       $dst_pointer.

   memset
        memset $buffer, $value, $length;

       The "memset" function writes $length bytes of $value to the address specified by $buffer.

   realloc
        my $new_pointer = realloc $old_pointer, $size;

       The "realloc" function reallocates enough memory to fit $size bytes.  It copies the existing data and
       frees $old_pointer.

       If you pass "undef" in as $old_pointer, then it behaves exactly like "malloc":

        my $pointer = realloc undef, 64; # same as malloc 64

   strdup
        my $pointer = strdup $string;

       The "strdup" function allocates enough memory to contain $string and then copies it to that newly
       allocated memory.  This version of "strdup" returns an opaque pointer type, not a string type.  This may
       seem a little strange, but returning a string type would not be very useful in Perl.

   strndup
        my $pointer = strndup $string, $max;

       The same as "strdup" above, except at most $max characters will be copied in the new string.

SEE ALSO

       FFI::Platypus
           Main Platypus documentation.

AUTHOR

       Author: Graham Ollis <plicease@cpan.org>

       Contributors:

       Bakkiaraj Murugesan (bakkiaraj)

       Dylan Cali (calid)

       pipcet

       Zaki Mughal (zmughal)

       Fitz Elliott (felliott)

       Vickenty Fesunov (vyf)

       Gregor Herrmann (gregoa)

       Shlomi Fish (shlomif)

       Damyan Ivanov

       Ilya Pavlov (Ilya33)

       Petr Pisar (ppisar)

       Mohammad S Anwar (MANWAR)

       Håkon Hægland (hakonhagland, HAKONH)

       Meredith (merrilymeredith, MHOWARD)

       Diab Jerius (DJERIUS)

COPYRIGHT AND LICENSE

       This software is copyright (c) 2015,2016,2017,2018,2019 by Graham Ollis.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5
       programming language system itself.