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  • Read from socket

    - by Alberto
    I need to read from an AF_UNIX socket to a buffer using the function read from C, but I don't know the buffer size. I think the best way is to read N bytes until the read returns 0 (no more writers in the socket). Is this correct? Is there a way to guess the size of the buffer being written on the socket? I was thinking that a socket is a special file. Opening the file in binary mode and getting the size would help me in knowing the correct size to give to the buffer? I'm a very new to C, so please keep that in mind.

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  • Understanding behaviour of read() and write()

    - by neo730
    hi i am a student and just start learning low level c programming.i tried to understand read() and write() methods with this program. #include <unistd.h> #include <stdlib.h> main() { char *st; st=calloc(sizeof(char),2);//allocate memory for 2 char read(0,st,2); write(1,st,2); } i was expecting that it would give segmentation fault when i would try to input more than 2 input characters.but when i execute program and enter " asdf " after giving " as " as output it executes "df" command. i want to know why it doesn't give segmentation fault when we assign more than 2 char to a string of size 2.and why is it executing rest(after 2 char)of input as command instead of giving it as output only? also reading man page of read() i found read() should give EFAULT error,but it doesn't. I am using linux.

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  • How can make a variable (not class member) "read only" in C#

    - by devfreak
    Hi, I'm new to the C# world and I can't find a method to declare read only variable in C# (something like declaring "const" variable in c++). Is there one? I'll give you an example: ... int f() { return x; } // x is not const member ... void g() { int readOnlyVar = f(); // is there a method to declare readOnlyVar as read only or const // Some code in which I want to restrict access to readOnlyVar to read only }

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  • How to export SQL Server data from corrupted database (with disk write error)

    - by damitamit
    IT realised there was a disk write error on our production SQL Server 2005 and hence was causing the backups to fail. By the time they had realised this the nightly backup was old, so were not able to just restore the backup on another server. The database is still running and being used constantly. However DBCC CheckDB fails. Also the SQL Server backup task fails, Copy Database fails, Export Data Wizard fails. However it seems all the data can be read from the tables (i.e using bcp etc) Another observation I have made is that the Transaction Log is nearly double the size of the Database. (Does that mean all the changes arent being written to the MDF?) What would be the best plan of attack to get the database to a state where backups are working and the data is safe? Take the database offline and use the MDF/LDF to somehow create the database on another sql server? Export the data from the database using bcp. Create the database (use the Generate Scripts function on the corrupt db to create the schema on the new db) on another sql server and use bcp again to import the data. Some other option that is the right course of action in this situation? The IT manager says the data is safe as if the server fails, the data can be restored from the mdf/ldf. I'm not sure so insisted that we start exporting the data each night as a failsafe (using bcp for example). IT are also having issues on the hardware side of things as supposedly the disk error in on a virtualized disk and can't be rebuilt like a normal raid array (or something like that). Please excuse my use of incorrect terminology and incorrect assumptions on how Sql Server operates. I'm the application developer and have been called to help (as it seems IT know less about SQL Server than I do). Many Thanks, Amit Results of DBBC CheckDB: Msg 1823, Level 16, State 2, Line 1 A database snapshot cannot be created because it failed to start. Msg 7928, Level 16, State 1, Line 1 The database snapshot for online checks could not be created. Either the reason is given in a previous error or one of the underlying volumes does not support sparse files or alternate streams. Attempting to get exclusive access to run checks offline. Msg 5030, Level 16, State 12, Line 1 The database could not be exclusively locked to perform the operation. Msg 7926, Level 16, State 1, Line 1 Check statement aborted. The database could not be checked as a database snapshot could not be created and the database or table could not be locked. See Books Online for details of when this behavior is expected and what workarounds exist. Also see previous errors for more details. Msg 823, Level 24, State 3, Line 1 The operating system returned error 1(error not found) to SQL Server during a write at offset 0x00000674706000 in file 'G:\AX40_Dynamics_Live.mdf'. Additional messages in the SQL Server error log and system event log may provide more detail. This is a severe system-level error condition that threatens database integrity and must be corrected immediately. Complete a full database consistency check (DBCC CHECKDB). This error can be caused by many factors; for more information, see SQL Server Books Online.

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  • WMI Rights required to read root\MicrosoftIISv2 in IIS7 with IIS6 compatibility mode

    - by JoeBilly
    I need to manage my IIS7 (Windows Server 2008) remotely with a WMI IIS6 API. So I added the IIS6 WMI Compatibility and IIS6 Metabase Compatibility roles to access the root\MicrosoftIIsv2 namespace. I have a domain account which is not administrator on the remote machine ; with this right, everything is ok. I configured these rights for my domain account to access the root\MicrosoftIIsv2 WMI namespace remotely ; note that these rights work perfectly on a IIS6 and Windows Server 2003 : DCOM : Account in Distributed COM Users Remote & local access to DCOM WMI : Root\CIMV2 (I need access here too) Execute methods, Enable Account, Remote Enable Root\Default (I need access here too) Execute methods, Enable Account, Remote Enable Root\MicrosoftIISv2 Execute methods, Enable Account, Provider Write, Remote Enable IIS Metabase (Metabase Explorer) : LM Full Control (W3SVC inherits these permissions) I tried to give some access on C:\Windows\System32\inetsrv too ; don't know if needed. My issue is : I can't list the IIS WebSites (\root\MicrosoftIISv2:IIsWebServerSetting.Name="W3SVC/*"). I don't get an 'access denied' but nothing is returned. My API and powershell tests can connect and execute queries in the root\MicrosoftIISv2 namespace I can read the IIsComputer class ex: Get-WmiObject IIsComputer -namespace "ROOT\MicrosoftIISv2" -authentication PacketPrivacy | SELECT * I can't read the IIsWebServerSetting, IIsWebServer ... to list the WebSites : the query returns an empty collection ex: Get-WmiObject IIsWebServerSetting -namespace "ROOT\MicrosoftIISv2" -authentication PacketPrivacy | SELECT ServerComment All queries work perfectly if the account is administrator as already said I am using PacketPrivacy authentication FI: I got a Warning Event 5605 with the Administrator right or not, that does not seem to have an impact : The root\MicrosoftIISv2 namespace is marked with the RequiresEncryption flag. Access to this namespace might be denied if the script or application does not have the appropriate authentication level. Change the authentication level to Pkt_Privacy and run the script or application again Ok, I have some more informations, when I use IIS 6 Metabase Explorer with my administrator account I can see the rights are correctly inherited for my non-administrator account. But when I try to connect using my non-administrator account, I can list the LM node, but get an "access denied, failed to get a key's data" when I try to browse the child nodes. I'll check further. I tried to Trace the WMI Activity, and everything seems OK ; this tends to confirm that the problem lies in IIS Rights.

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  • ubuntu bind9 AppArmor read permission denied (chroot jail)

    - by Richard Whitman
    I am trying to run bind9 with chroot jail. I followed the steps mentioned at : http://www.howtoforge.com/debian_bind9_master_slave_system I am getting the following errors in my syslog: Jul 27 16:53:49 conf002 named[3988]: starting BIND 9.7.3 -u bind -t /var/lib/named Jul 27 16:53:49 conf002 named[3988]: built with '--prefix=/usr' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--sysconfdir=/etc/bind' '--localstatedir=/var' '--enable-threads' '--enable-largefile' '--with-libtool' '--enable-shared' '--enable-static' '--with-openssl=/usr' '--with-gssapi=/usr' '--with-gnu-ld' '--with-dlz-postgres=no' '--with-dlz-mysql=no' '--with-dlz-bdb=yes' '--with-dlz-filesystem=yes' '--with-dlz-ldap=yes' '--with-dlz-stub=yes' '--with-geoip=/usr' '--enable-ipv6' 'CFLAGS=-fno-strict-aliasing -DDIG_SIGCHASE -O2' 'LDFLAGS=-Wl,-Bsymbolic-functions' 'CPPFLAGS=' Jul 27 16:53:49 conf002 named[3988]: adjusted limit on open files from 4096 to 1048576 Jul 27 16:53:49 conf002 named[3988]: found 4 CPUs, using 4 worker threads Jul 27 16:53:49 conf002 named[3988]: using up to 4096 sockets Jul 27 16:53:49 conf002 named[3988]: loading configuration from '/etc/bind/named.conf' Jul 27 16:53:49 conf002 named[3988]: none:0: open: /etc/bind/named.conf: permission denied Jul 27 16:53:49 conf002 named[3988]: loading configuration: permission denied Jul 27 16:53:49 conf002 named[3988]: exiting (due to fatal error) Jul 27 16:53:49 conf002 kernel: [74323.514875] type=1400 audit(1343433229.352:108): apparmor="DENIED" operation="open" parent=3987 profile="/usr/sbin/named" name="/var/lib/named/etc/bind/named.conf" pid=3992 comm="named" requested_mask="r" denied_mask="r" fsuid=103 ouid=103 Looks like the process can not read the file /var/lib/named/etc/bind/named.conf. I have made sure that the owner of this file is user bind, and it has the read/write access to it: root@test:/var/lib/named/etc/bind# ls -atl total 64 drwxr-xr-x 3 bind bind 4096 2012-07-27 16:35 .. drwxrwsrwx 2 bind bind 4096 2012-07-27 15:26 zones drwxr-sr-x 3 bind bind 4096 2012-07-26 21:36 . -rw-r--r-- 1 bind bind 666 2012-07-26 21:33 named.conf.options -rw-r--r-- 1 bind bind 514 2012-07-26 21:18 named.conf.local -rw-r----- 1 bind bind 77 2012-07-25 00:25 rndc.key -rw-r--r-- 1 bind bind 2544 2011-07-14 06:31 bind.keys -rw-r--r-- 1 bind bind 237 2011-07-14 06:31 db.0 -rw-r--r-- 1 bind bind 271 2011-07-14 06:31 db.127 -rw-r--r-- 1 bind bind 237 2011-07-14 06:31 db.255 -rw-r--r-- 1 bind bind 353 2011-07-14 06:31 db.empty -rw-r--r-- 1 bind bind 270 2011-07-14 06:31 db.local -rw-r--r-- 1 bind bind 2994 2011-07-14 06:31 db.root -rw-r--r-- 1 bind bind 463 2011-07-14 06:31 named.conf -rw-r--r-- 1 bind bind 490 2011-07-14 06:31 named.conf.default-zones -rw-r--r-- 1 bind bind 1317 2011-07-14 06:31 zones.rfc1918 What could be wrong here?

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  • 'Memory read error',Sever hardware error?

    - by wss8848
    hello I got a error about my server which is running CentOS5.5. MCE 20 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor CPU 1 BANK 8 TSC 6ab9ff9745f62 [at 2394 Mhz 9 days 1:50:52 uptime (unreliable)] MISC cf36ad0100081186 ADDR 203376500 MCG status: MCi status: MCi_MISC register valid MCi_ADDR register valid MCA: MEMORY CONTROLLER RD_CHANNELunspecified_ERR Transaction: Memory read error STATUS 8c0000400001009f MCGSTATUS 0 what is the matter? is memory card error or memory controller error?

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  • Win7 - DVD drive spins up but fails to read, fails write

    - by MA
    Running Windows 7 x64. DVD drive is a BenQ DC DQ60 ATA dvd-dl rw. Everything functions correctly in linux, and I can boot to cd/dvds, so the drive itself does work. Symptom: when I insert any CD or DVD (burned or retail), the drive spins up the disk, and (usually) displays the disk title in My Computer, but just continues to spin indefinitely. I cannot browse the disk in the drive, install from it, or read anything.

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  • Read/Select:Connection reset by peer (10054) during remote logoff in RealVNC

    - by Santhosh
    I am using RealVNC 4.5 Enterprise on my Windows 7 client. I use this to connect to a remote system which is also running RealVNC 4.5 (on Windows 7 again). And then i logoff the remote system (server) and all of a sudden the realvnc viewer on the client closes with the message : "Read/Select:Connection reset by peer (10054)" It also asks if i want to reconnect again. Any idea why this is happening and how do i resolve this?

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  • Mac can write to samba share

    - by David
    I have a samba share that works fine for PCs, but we have a mac user who seems to only be able to edit and rename existing files, he cannot add new files. Any ideas? Here is the share setup: path = /media/freeagent/officeshare read only = No guest ok = Yes writeable = yes public = yes

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  • How does NFS read cache work on Debian?

    - by Ztyx
    I am planning to use NFS to serve out many small files. They will be read very often so client side caching is crucial. Does NFS handle this? Is there a way to increase the client side caching in some way? ...or should I look at another solution? Syncing using rsync or unison periodically is not an option since the files are modified on the client side from time to time.

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  • Read/Select:Connection reset by peer (10054) during remote logoff in RealVNC

    - by Santhosh
    I am using RealVNC 4.5 Enterprise on my Windows 7 client. I use this to connect to a remote system which is also running RealVNC 4.5 (on Windows 7 again). And then i logoff the remote system (server) and all of a sudden the realvnc viewer on the client closes with the message : "Read/Select:Connection reset by peer (10054)" It also asks if i want to reconnect again. Any idea why this is happening and how do i resolve this?

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  • Likewise: joined Active Directory but cannot write shares.

    - by Aron Rotteveel
    I have never used a Linux system in an AD environment before and am trying to join my laptop running Ubuntu to join our Active Directory (DC is a Windows Server 2008 machine) using Likewise-open. Using the GUI wizard, I have joined the domain. I can mount network shares using CIFS Problem: I only have read access to our fileserver. What more is needed to get the AD to recognize me as a user who has the appropriate rights? Any help is appreciated.

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  • how to give read access to logs

    - by skomak
    Hi, How can i give read access to logs for other users? Perhaps the solution is to set group for this files and add some users there. But how to do that for /var/log/maillog? I mean, logrotate will reset perms? If i change group from root to another won't it generate any problems? Actual state: -rw------- 1 root root 337M kwi 22 15:40 maillog

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  • Is the /etc/inittab file read top down?

    - by PeanutsMonkey
    When the init process is executed when the kernel has loaded, does it read the /etc/inittab file in a top down approach i.e. it executes each line as it appears in the file. If so and based on my reading and understanding, does this mean that it enters the documented run level and then launch sysinit process or vice versa? For example the common examples I have seen are id:3:initdefault: # System initialization. si::sysinit:/etc/rc.d/rc.sysinit

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  • PPTP VPN Not Working - Peer failed CHAP authentication, PTY read or GRE write failed

    - by armani
    Brand-new install of CentOS 6.3. Followed this guide: http://www.members.optushome.com.au/~wskwok/poptop_ads_howto_1.htm And I got PPTPd running [v1.3.4]. I got the VPN to authenticate users against our Active Directory using winbind, smb, etc. All my tests to see if I'm still authenticated to the AD server pass ["kinit -V [email protected]", "smbclient", "wbinfo -t"]. VPN users were able to connect for like . . . an hour. I tried connecting from my Android phone using domain credentials and saw that I got an IP allocated for internal VPN users [which I've since changed the range, but even setting it back to the initial doesn't work]. Ever since then, no matter what settings I try, I pretty much consistently get this in my /var/log/messages [and the VPN client fails]: [root@vpn2 ~]# tail /var/log/messages Aug 31 15:57:22 vpn2 pppd[18386]: pppd 2.4.5 started by root, uid 0 Aug 31 15:57:22 vpn2 pppd[18386]: Using interface ppp0 Aug 31 15:57:22 vpn2 pppd[18386]: Connect: ppp0 <--> /dev/pts/1 Aug 31 15:57:22 vpn2 pptpd[18385]: GRE: Bad checksum from pppd. Aug 31 15:57:24 vpn2 pppd[18386]: Peer armaniadm failed CHAP authentication Aug 31 15:57:24 vpn2 pppd[18386]: Connection terminated. Aug 31 15:57:24 vpn2 pppd[18386]: Exit. Aug 31 15:57:24 vpn2 pptpd[18385]: GRE: read(fd=6,buffer=8059660,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs Aug 31 15:57:24 vpn2 pptpd[18385]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7) Aug 31 15:57:24 vpn2 pptpd[18385]: CTRL: Client 208.54.86.242 control connection finished Now before you go blaming the firewall [all other forum posts I find seem to go there], this VPN server is on our DMZ network. We're using a Juniper SSG-5 Gateway, and I've assigned a WAN IP to the VPN box itself, zoned into the DMZ zone. Then, I have full "Any IP / Any Protocol" open traffic rules between DMZ<--Untrust Zone, and DMZ<--Trust Zone. I'll limit this later to just the authenticating traffic it needs, but for now I think we can rule out the firewall blocking anything. Here's my /etc/pptpd.conf [omitting comments]: option /etc/ppp/options.pptpd logwtmp localip [EXTERNAL_IP_ADDRESS] remoteip [ANOTHER_EXTERNAL_IP_ADDRESS, AND HAVE TRIED AN ARBITRARY GROUP LIKE 5.5.0.0-100] Here's my /etc/ppp/options.pptpd.conf [omitting comments]: name pptpd refuse-pap refuse-chap refuse-mschap require-mschap-v2 require-mppe-128 ms-dns 192.168.200.42 # This is our internal domain controller ms-wins 192.168.200.42 proxyarp lock nobsdcomp novj novjccomp nologfd auth nodefaultroute plugin winbind.so ntlm_auth-helper "/usr/bin/ntlm_auth --helper-protocol=ntlm-server-1" Any help is GREATLY appreciated. I can give you any more info you need to know, and it's a new test server, so I can perform any tests/reboots required to get it up and going. Thanks a ton.

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  • Git push write access for deployment denied

    - by Stepchik
    I have strange issue when try git push. Git clone and commit works fine. W access for my_project DENIED to deploy_my_project_ My gitolite.conf repo my_project R = deploy_my_project_111 RW+ = my_name I wonder why git push takes wrong user (deploy_project_111) with read access. This error is float. Twice i had to change rsa key(rsa keys is unchangeble) and restart computer. May be my computer do something wrong.

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  • /etc/exports file not read on boot

    - by netimen
    I added some entries into my /etc/exports file. But when I boot my system, the file is not read. I check it by sudo exportfs — it returns nothing (also I can't mount the exported folders on other systems). Then I run sudo expotfs -a and then again sudo exportfs — and now all my exported folders are listed (and now I can mount the exported folders on other systems). I'm running kubuntu 9.04 with 2.6.28-11-generic kernel

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