c - Converting string to key_t -



c - Converting string to key_t -

how possible convert string key_t, in order utilize creating shared memory segment using shmget?

this because key mapping shared memory beingness transmitted on tcp/ip.

thanks in advance!

the key created phone call ftok(). latter uses file path , 8bit value so.

for same file path , same 8bit value ftok() (re-)creates same key.

so transfer file path , 8bit value (typically char) , allow receiver phone call ftok() on values received. create same key sender uses.

from ftok()'s documentation:

the ftok() function uses identity of file named given pathname (which must refer existing, accessible file) , to the lowest degree important 8 bits of proj_id (which must nonzero) generate key_t type scheme v ipc key, suitable utilize msgget(2), semget(2), or shmget(2).

the resulting value same pathnames name same file, when same value of proj_id used. value returned should different when (simultaneously existing) files or project ids differ.

c linux shared-memory sysv-ipc

Comments

Post a Comment

Popular posts from this blog

php - Android app custom user registration and login with cookie using facebook sdk -

php - Android app custom user registration and login with cookie using facebook sdk - i developing android application in users need register , log in using facebook. approximately, flow. open app first time, authenticate facebook, data, send info server create them business relationship in application, start session new business relationship in server, cookie perform later interactions. so far good. what need know wich info have send server, can able identify users when log in seccond time. because need start session in server , send cookie android app farther interactions. i'm using php server side language. i thinking getting getaccesstoken() in android facebook sdk, pass server on business relationship creation , storing in android app. but can't manage how login users on sec time utilize app. any suggestions ? in advance ! to uniquely identify user within app, should create request /me , user's id. guaranteed unique , remain con...
Read more

ruby on rails - Devise Logout Error in RoR -

ruby on rails - Devise Logout Error in RoR - while using devise in ror, encountering unusual error when trying log out url different root url. displays me : actioncontroller::invalidauthenticitytoken in devise::sessionscontroller#destroy" for illustration if rooting path after log in '/structure', , seek log out '/general' error, while logging out '/structure' fine. any help highly appreciated. ruby-on-rails ruby devise
Read more

c# - Create a Notification Object (Email or Page) At Run Time -- Dependency Injection or Factory -

c# - Create a Notification Object (Email or Page) At Run Time -- Dependency Injection or Factory - i have code emails me notification when happens. trying add together page , also remove dependency on email. for reference; have name of notification want send stored string in database. @ runtime have list of people , string representation of want receive. i thought dependency injection ninject, kernel bindings got big , seemed hacking together. then thought simple factory, activator.createinstance(email/page) inotifcation, don't know how handle differing constructor parameters (unless utilize common, complex property, employee, has info need). so far have this: public interface inotification { void sendmessage(); } public class email: inotification { private readonly string _toemailaddress; private string body { { homecoming "email"; } } private static string smtphost { ...
Read more