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Shared Memory Between C Programs

 
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Old 04-13-2011
Shared Memory Between C Programs
I'm involved in a project with multiple teams which are developing C code for a Linux machine and we would like to have our program pass data to one of the other group's programs. The immediate idea is to have shared memory between the programs which would simply consist of variables whose size and offset from the beginning of the file are specified and have one program read from it while the other writes to it.

Will we run into any problems if we simply treat this file like any other file in our respective programs (i.e. fd = open(....) and just write to/read from fd at our leisure) or are there special steps that need to be taken in order to avoid simultaneously accessing the same data or something of that nature?
 
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group

GROUP(5)						     Linux Programmer's Manual							  GROUP(5)

NAME

       group - user group file

DESCRIPTION

       The /etc/group file is a text file that defines the groups on the system.  There is one entry per line, with the following format:

	      group_name:password:GID:user_list

       The fields are as follows:

       group_name  the name of the group.

       password    the (encrypted) group password.  If this field is empty, no password is needed.

       GID	   the numeric group ID.

       user_list   a list of the usernames that are members of this group, separated by commas.

FILES

       /etc/group

BUGS

       As the 4.2BSD initgroups(3) man page says: No-one seems to keep /etc/group up-to-date.

SEE ALSO

       login(1), newgrp(1), getgrent(3), getgrnam(3), passwd(5)

COLOPHON

       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2010-10-21								  GROUP(5)