comment on

Your quite right about being passed on fork (but it is not copied across exec's if working at the C level).

And zentara I think your right about the octal to decimal conversion.

As for using mmap(2) for IPC, Stevens demonstrates a technique for mmap across related processes (you cant use mmap across unrelated processes, because the address is for that process family. If an unrelated process tries to use it, you'll get a SIGSEGV or SIGBUS core dump). He creates a mmap'd area from /dev/zero, then has co-operating parent and child increment a long integer in turn.

Stevens last word on mmap and shared memory is "If shared memory is required between unrelated processes, the shmXXX functions must be used"

...it is better to be approximately right than precisely wrong. - Warren Buffet

In reply to Re^2: Mmap question by leriksen
in thread Mmap question by zentara

Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
Want more info? How to link or How to display code and escape characters are good places to start.


more useful options
	PerlMonks