linux practice test

we process 4 times, where one of the instantiated related built-in variables is Gl_invocationid, which represents the call value of the geometry shader request (invocation) Assignment ( Invocation), can also be simply understood as the first few calls, through Gl_invocation to give Gl_viewportindex assignment to which viewport, and Model_matrix is the viewport rendering matrix, So the process of this geometry shader is to set the viewport index first, and then use the viewport's matrix to trans

Shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown Halt:x:7:0:halt:/sbin:/sbin/halt Mail:x : 8:12:mail:/var/spool/mail:/sbin/nologin Operator:x:11:0:operator:/root:/sbin/nologin games:x:12:100: Games:/usr/games:/sbin/nologin ftp:x:14:50:ftp user:/var/ftp:/sbin/nologin nobody:x:99:99:nobody:/:/sbin/ Nologin Systemd-network:x:192:192:systemd Network management:/:/sbin/nologin Dbus:x:81:81:system message bus :/:/sbin/nologin Polkitd:x:999:997:user for Polkitd:/:/sbin/nologin postfix:x:89:89::

/sysconfig/test | Egrep-o "[^/][a-za-z0-9]+$"650) this.width=650; "title=" 9.png "src=" Http://s3.51cto.com/wyfs02/M01/72/76/wKioL1XkUtnSQKNuAACz26y4F1Q779.jpg " alt= "Wkiol1xkutnsqknuaacz26y4f1q779.jpg"/>10. Find out the number of 1-255 in the execution result of IP add commandIP Add | Egrep "\650) this.width=650; "Width=" 907 "height=" 142 "title=" 8.png "style=" width:601px;height:131px; "alt=" Wkiol1xj9chceefxaagqhdrnzq8567.jpg "src=" Http://s3.51

situation, when a thread ends, the system resources it consumes are not released, that is, there is no real termination. only when the Pthread_join () function returns does the created thread release the system resources that it occupies . In the case of detached attributes, the system resources that it occupies are released immediately at the end of a thread. one thing to note here is that if you set the Detach property of a thread, and the thread runs very fast, it is likely to terminate befo

Linux Process understanding and practice (2) zombie and orphan processes and file sharingOrphan process and zombie process orphan process: 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) # Include Zombie process: if the child process exits first and the parent process

pthread_setspecific bound thread 2, at which time thread 1 calls pthread_getspecific returns the key_t bound TSD pointer, which is still a TSD pointer to thread 1, even though key_t There is only one, but each thread has its own TSD.Specific data. With the key-value Implementation, a thread creates a keyand other threads are created. but not the same fast memory pointing to. They point to their own data.This is thread-specific data.In the above code, even Sleeep (2), thread 1 's data is not a

another host. It can be used with the default settings by just specifying a hostname (e.g. ping raspberrypi.org ) or an IP address (e.g. ping 8.8.8.8 ). It can specify the number of packets to send with the -c flag.Nmapnmapis a network exploration and scanning tool. It can return port and OS information about a host or a range of hosts. Running just would display the options available as well as nmap example usage.HOSTNAMEThe hostname command displays the current hostname of the system. A privi

EXECVP start a new program in the program:To create a new process with fork:Forkdemo2 Code:When testing the fork, refer to the Linux authoritative guide reading notes (3) using patches:[Email protected] programming]#diff-C forkdemo2.c forkdemo2_new.c > Forkdemo2.Patch[email protected] programming]#PatchPatchPatchingfileForkdemo2.c[[email protected] programming]#ls-Lrttotal7-rwxrwxrwx1Root root4953Sep6 One: toForkdemo2-rwxrwxrwx1Root root4957Sep6 One

CP command to save the/etc/directory for archiving, storage location is/backups/etc-yyyy-mm-dd;[Email protected] ~]# mkdir/backups[Email protected] ~]# CRONTAB-E* * 1-6/bin/tar-czvf/backups/etc.$ (date +%y-%m-%d) tar.gz/etc/650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/CE/wKiom1XtZ5vxm_IHAABP_rACL_Q488.jpg "/>Third, every Sunday 2:30 A.M., run the CP command to backup the/etc/fstab file, the storage location is/backup/fstab-yyyy-mm-dd-hh-mm-ss;[Email protected] ~]# crontab E* *

; /* Band event (is int in GLIBC 2.3.2 and earlier) */int si_fd; /* File Descriptor */short SI_ADDR_LSB; /* Least significant bit of address (since Linux 2.6.32) */}Sigqueue #include FunctionSigqueue is a new signaling signalling system called, mainly for real-time signal support signal with parameters , and function sigaction () with the use.One more parameter than the KILL function:Const Union sigval value (

graph bar will change depending on the scale;Press J or press K to scroll up or down the screen to display the connection record;Press 1 or 2 or 3 to sort by the three-column traffic data displayed on the right;Sort by Sort by > According to the host name or IP of the remote target host;Press O to toggle whether the current connection is fixed only;Press F to edit the filter code, this is translated by the saying, I have not used this!You can use the shell command, this is useless! I don't know

OpenGL ShadowsIn a three-dimensional scenario, in order to make the scene look more realistic, you often need to add a shadow to it, OpenGL can use many techniques to achieve the shadow, and one of the very classic implementations is to use a shadow map implementation, in this section we will use a shadow map to achieve a simple scene of the shadow.PrincipleUsing shadow maps to implement shading, the principle is to use OpenGL rendering to the map to render the current scene through depth