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Install QtCreator4.5 in Ubuntu

. Execute the installation command /Qt-sdk-linux-x86-opensource-2009.02.bin After QtCreator is installed to build a helloworld project for compilation, the following error may occur during compilation: /Usr/bin/ld: cannot find-lfreetype Collect2: ld returns 1 Make [1]: *** [text] Error 1 Make [1]: leaving the directory '/home/noah/qtWorkPlace/text' Make: Leave the directory "/home/noah/qtWorkPlace/text" Make: *** [debug] Error 2 Exited with code 2. Er

Process of programming in Linux (II): fork function Summary

system is called, the Parent and Child processes are executed alternately.If the parent process exits first and the child process has not exited, the parent process of the child process will become the INIT process. (Note: Any process must have a parent process)If the sub-process exits first and the parent process has not exited, the sub-process must wait until the sub-process is captured and

NFS configuration in Embedded Linux

. d/nfs startMount NFS on an Embedded Target machine:Mnfs: #! /Bin/sh Mount-t nfs 192.168.0.20:/home/work/nfs/mnt/nfs-O nolock ========================================================== ================================================ ====================================== Problems on my PC # Systemctl status nfs-server.serviceNfs-server.service-NFS serverLoaded: loaded (/usr/lib/systemd/system/nfs-server.service; Enabled)Active: Failed (Result: Exit-code) Since Thu, 14 mar 2013 10:07:58 + 0800

How to Control submission and rollback of stored procedures in Oracle

Create table test1 (id number, name varchar2 (20 ));Create table test2 (id number, name varchar2 (20 ));Create table test3 (id number, name varchar2 (20 )); 1. No commit is displayed in t1; Create or replace procedure t1AsBeginFor I in 1 .. 10000 loopInsert into test1 (id, name) values (I, 'leng' | I );End loop;End; No commit is displayed in t1; After exec t1, if the session is not exited, it will not be submitted. At this time, if rollback is used, i

Shell programming structure, shell programming structure

parameter of the function is passed to the function when the function is called, rather than the parameter passed to the script. Therefore, the location variable of the script is different from the location variable of the function, but $0 is consistent with the location variable $0 of the script. In addition, the function also accepts the special variable "$ #". Like the script's "$ #", it also indicates the number of location variables.(7) The return command can be used inside the function bo

Coreos practice (1)-coreos initial experience

. Service-my service Loaded: loaded (/run/fleet/units/Hello. Service; linked-runtime) Active: active (running) Since mon 2014-09-08 04:21:13 UTC; 1 min 25 s ago Process: 1117 execstartpre =/usr/bin/docker pull busybox (code = exited, status = 0/success) Process: 1108 execstartpre =/usr/bin/docker RM Hello (code = exited, status = 1/failure) Process: 1046 execstartpre =/usr/bin/docker kill Hello (code =

Android Implementation Click on the notification bar, first start the application and then open the target activity, the aurora push and other push can also refer to

I have integrated the Aurora push in the project, push the notification bar point open need to determine which interface to refer to this article, thank the author's selfless.Situation BriefIn the process of developing an Android app, there is a need to launch a service in the app that runs in a standalone process, keeps a long connection to the server, displays the message that the server pushes over the notification bar, and sets the click action. Click to jump to the corresponding activity in

Installed virtual machine Suddenly can't surf the internet, the error is very strange, the specific error is as follows

installed virtual machine suddenly can't surf the internet, the error is very strange, the specific error is as follows: /etc/init.d/network restart Restarting network (via Systemctl): Job for Network.service failed because the control process exited with error code. "Systemctl status Network.service" and "Journalctl-xe" for details. [Failed] Use the Systemctl status Network.service command to see the results as follows: Network.service-lsb:bring Up/d

Configure httpd High Availability Service Based on Heartbeat in Linux

15Heartbeat [4374]: 2015/11/06 _ 11:53:16 info: killing HBWRITE process 4380 with signal 15Heartbeat [4374]: 2015/11/06 _ 11:53:16 info: Core process 4378 exited. 5 remainingHeartbeat [4374]: 2015/11/06 _ 11:53:16 info: Core process 4379 exited. 4 remainingHeartbeat [4374]: 2015/11/06 _ 11:53:16 info: Core process 4381 exited. 3 remainingHeartbeat [4374]: 2015/1

An OpenStack installation detects that Apache is not booting

when installing the OpenStack kilo version, there is a step to detect that Apache could not start, searched all the information Google did not search to do their own, I use the centos-7-x86_64-bit system, The error message is as follows:Error:error appeared during Puppet run:192.168.209.143_horizon.ppError:could not start service[httpd]: Execution of '/usr/bin/systemctl start httpd ' returned 1:job for Httpd.service FAI LED because the control process exited

Apache suspended animation, Apache maintenance, thank you

Apache suspended animation, Apache maintenance, Master Please come in, thank you A few days ago, Apache still died every 1 days, I have been trying to solve, but these two days, every one hours to die once, if after his death, I do not manually end the process in the Httpd.exe, will appear the following log: HTML Code ...... [Sun 16 09:20:45 2009] [Notice] Parent:child process exited with status 1--restarting. [Sun 16 09:20:45 2009] [Notice] a

Linux thread, process classic article

value 2 * pthread_threads_max + 1 does not conflict with the ID of any common user thread. The management thread runs as a subthread of the caller thread of pthread_create (), while the user thread created by pthread_create () is created by the management thread by calling clone, therefore, it is actually a sub-thread of the Management thread. (The Sub-thread concept should be understood as a sub-process .) _ Pthread_manager () is the main loop of the Management thread. After a series of initia

TCP/IP network duplicate Server Communication Software Design

loop, the communication sub-process first queries whether there are new records in the shared memory. If yes, it establishes a connection with this client and then polls all the read sockets with established connections, check whether the data is readable. If yes, read the data and indicate which records of the shared memory are obtained from the read socket, another communication sub-process obtains the corresponding write socket from the shared memory according to the record number, and final

Modify the default storage path of MySQL

their paths. Of course, this my. cnf may appear elsewhere. If it is a new user, it may not be found, but it does not matter, Ls/usr/share/mysql/ You can see some mysql-XXX-cnf. You can select some of them as the template, modify them, and drop/etc. Get_mysql_option In addition to cnf, you also need to modify the get_mysql_option setting... Most of the files on the Internet are previous versions, and the file "/etc/rc. d/init. d/mysqld" should be modified. In fact, this script does not exist for

Centos7 modify the ssh port !, Centos7 modify ssh port

-m tcp --dport 22 -j ACCEPT-A INPUT -p tcp -m state --state NEW -m tcp --dport 2218 -j ACCEPT Save and exit Restart iptables [root@niche sysconfig]# systemctl stop iptables[root@niche sysconfig]# systemctl start iptables[root@niche sysconfig]# systemctl status iptablesiptables.service - IPv4 firewall with iptables Loaded: loaded (/usr/lib/systemd/system/iptables.service; enabled) Active: active (exited) since Thu 2014-12-18 10:11:13 EST; 5s ago

Learn more about adorner usage in Python

relatively low to accomplish the same thing: def foo (): Passfoo = Staticmethod (foo) Because with this decorator operator, you can get the same result very gracefully: @staticmethoddef foo (): Pass But there are a lot of people who oppose adorners because of this, but @ is just a small syntactic sugar, passing a function object to another function and replacing the original method with the return value.I think the reason the decorator has such a big impact is because this little syntactic su

Waitpid and wait usage in linux

# Include # Include Int main (void) {pid_t childpid; int status; childpid = fork (); if (-1 = childpid) {perror ("fork ()"); exit (EXIT_FAILURE);} else if (0 = childpid) {puts ("In child process"); sleep (3); // let the sub-process sleep for 3 seconds, look at the behavior of the parent process printf ("\ tchild pid = % d \ n", getpid (); printf ("\ tchild ppid = % d \ n ", getppid (); exit (EXIT_SUCCESS);} else {waitpid (childpid, status, 0);

PHP multi-process programming example

after two seconds after the child process is output, and the parent process is blocked until the child process exits.7. pcntl_getpriority ([int $ pid [, int $ process_identifier])Get the priority of the process, that is, the nice value. The default value is 0. In my testing environment linux (CentOS release 5.2 (Final), the priority is-20 to 19, -20 is the highest priority, and 19 is the lowest. (From-20 to 20 in the manual ).8. pcntl_setpriority (int $ priority [, int $ pid [, int $ process_id

Learn how to use the annotator in Python and how to use python.

thing: def foo(): passfoo = staticmethod(foo) With the @ operator, you can get the same result elegantly: @staticmethoddef foo(): pass However, many people oppose the decorator because of this, But @ is only a small syntactic sugar. It passes a function object to another function and then replaces the original method with the return value.I think the reason why the decorator has such a big impact is that this small syntactic sugar has completely changed the way people think about programming. I

Android broadcast mechanism overview

exited, the main has a corresponding broadcast issued, still can receive, but this kind of description from the beginning of Android 3.1 may no longer be established, detailed analysis is detailed in the later part of this article.2). Dynamic registration:When registering dynamically, you do not need to register the 1 Registerreceiver (broadcastreceiver receiver, Intentfilter filter)2 Registerreceiver (broadcastreceiver receiver, Intentfilter filter,

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