I am working on some network server which has to monitor the os events and report it to some GUI. For that I want to read the /dev/log and process it and report it to the GUI. So here my aim is not to write but I want to read the messages coming to /dev/log. I made some changes in the code which I pasted in my first post. And found out working with some limitation. My program has to come up before the syslogd comes up. And second is once I bind and start reading syslogd is not able to read anything with which I can not live with. Now I want to know, Is there any possiblity that My program and syslogd both can listen and read the messages? I mean once I or syslogd reads message buffre for /dev/log does not emptied. I don't want to consume message from the /dev/log, I just want to read it. If I summerise my question than, Is there any possibility to read the datagram socket whithout consuming data from the socket? I want to keep the data for other applications to read. -----Original Message----- From: Rick Stevens [mailto:ricks@xxxxxxxx] Sent: Thursday, July 22, 2010 9:52 PM To: Community support for Fedora users Subject: Re: bind() to /dev/log failed On 07/21/2010 11:29 PM, Mansuri, Wasim (NSN - IN/Bangalore) wrote: > > > Hello All, > > I want to listen to /dev/log. For that I am using the following code. > > Please let me know whats the issue in the following code snip. Code I am running with root user. > > Thanks, wasim > > if ((sockfd = socket(AF_UNIX,SOCK_STREAM, 0)) == -1) > { > printf("Failed To open AF_UNIX Socket"); > return -1; > } > sunx.sun_family = AF_UNIX; > strncpy(sunx.sun_path, PR_PATH_LOG, sizeof(sunx.sun_path)); > /*if (connect(sockfd,&syslog_addr, sizeof(syslog_addr)) == -1) { //Connect call goes successful, But after that I am not able to recv any data.*/ > if (bind(sockfd, (struct sockaddr *)&sunx,sizeof(sunx.sun_family)+strlen(sunx.sun_path))< 0) { /* bind fails saying 98 : Address already in use Even if I kill syslogd*/ > printf("Connect failed with the errno %s %d : %s\n",PR_PATH_LOG, errno,strerror(errno)); > close(sockfd); > } > > if(recv( sockfd, (void *) buff, 1024,0)<=0) /* recv never come out if I use connect even after I do logger */ > { > printf("Error in recv call... errno = %d : %s : %s\n", errno, strerror(errno),buff); > break; > } I can see a couple of things. First, [r|ng]syslogd _listens_ to /dev/log, it is not the output. If you want to log things, you write to /dev/log and syslogd will log it. This, for example, is how the utility "logger(1)" works. If you're trying to monitor what's being fed _to_ [r|ng]syslogd, this probably won't work as syslogd has already opened the socket for read. Second, If you're going to do a bind(), you must do it before the connect(), not after. Third, a bind() is not necessary if you are a client--only if you're the server. You can bind() as a client if you wish to have a specific address assigned to you. However your code is trying to use the already existing data for syslogd. You'd need to create a unique pathname to bind to you. ---------------------------------------------------------------------- - Rick Stevens, Systems Engineer, C2 Hosting ricks@xxxxxxxx - - AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 - - - - "Celibacy is not hereditary." - - -- Guy Goden - ---------------------------------------------------------------------- -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
