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The ioctl20160705 of Linux

user space, such as i/ o The device can be opened with open (2), the network protocol may be opened with a socket (2), etc., and after obtaining a file descriptor, it is possible to invoke the IOCTL (2) on this descriptor to exchange data to the kernel.3. IOCTL (2)The basic use format for the IOCTL (2) function is:int ioctl (int fd, int cmd, void *data)The first parameter is the file descriptor; cmd is an operation command, generally divided into get, set and other types of commands, get is the

Paper 69:haar-like Rectangle Traversal Detection window demo MATLAB source code [reprint]

; % Haar window Width nr = num-r (I) +1; % moving number in line direction NC = num-c (J) +1; Number of moves in the% column direction Px0 = [0 R]; % Rectangle coordinate initialization Py0 = [0 c/2 c]; For i = 1:nr for j = 1:nc Px = px0+ (i-1) *delta; % sliding Pick-point Py = py0+ (j-1) *

Linux Soft Interrupt Summary

half application is also the reason for motivating the kernel to develop the current Soft Interrupt mechanism. Therefore, we should first start with the implementation of bottom half.  Ii. bottom half  In the Linux kernel, bottom half usually uses "bh" to indicate that it is initially used to complete non-critical time-consuming actions for service interruption in lower-privilege context, now it is also used for all asynchronous actions that can be performed in lower-priority context. The earli

5G Base Station: please call brother! __soc

to as NR, the full name new Radio access Technology in 3GPP, this article is called 5G-NR. 5G-NR Scenarios and KPIs See TR 38.913 "Study on Scenarios and Requirements for Next Generation Access Technologies" The 5G defines three main scenarios: EMBB (Enhanced mobile broadband), enhanced mobile broadband MMTC (Massive Machine Type Communications), large

Common commands for website server troubleshooting

: '{print $1}'|sort|uniq -c|sort -nr|head -n20netstat -ant |awk '/:80/{split($5,ip,":");++A[ip[1]]}END{for(i in A) print A,i}' |sort -rn|head -n20 3. Use tcpdump to sniff access to port 80 to see who is the highest tcpdump -i eth0 -tnn dst port 80 -c 1000 | awk -F"." '{print $1"."$2"."$3"."$4}' | sort | uniq -c | sort -nr |head -20 4. Search for more time_wait connections netstat -n|grep TIME_WAIT|awk

Linux tasklet Analysis notes

tasklet_schedule function to run tasklet. Static inline void tasklet_schedule (struct tasklet_struct * t){If (! Test_and_set_bit (tasklet_state_sched, T-> State ))_ Tasklet_schedule (t );} Function _ tasklet_schedule obtains the tasklet_vec linked list of the current CPU, and executes the tasklet_softirq Soft Interrupt. Void fastcall _ tasklet_schedule (struct tasklet_struct * t){Unsigned long flags; Local_irq_save (flags );T-> next = _ get_cpu_var (tasklet_vec). List;_ Get_cpu_var (tasklet_ve

Standard File Read process (read)

Read routine, and uses* Mapping-> a_ops-> readpage () function for the actual low-level stuff.*/Void do_generic_mapping_read (struct address_space * mapping,Struct file_ra_state * _ Ra,Struct file * filp,Loff_t * PPOs,Read_descriptor_t * DESC,Read_actor_t actor){Struct inode * inode = mapping-> host;Unsigned long index;Unsigned long end_index;Unsigned long offset;Unsigned long last_index;Unsigned long next_index;Unsigned long prev_index;Loff_t isize;Struct page * cached_page;Int error;Struct fi

PHP Access Message Board Program _php Tutorial

($name = = $adminname $PWS = = $ADMINPWS) {Setcookie ("admin", $admincookie, Time () +3600); Header ("location:./");}else{echo "";}} if ($ABC = = "Exit") {Setcookie ("admin", "", Time ()-3600); Header ("location:./");} if ($abc = = "Editadmin") {if (! $webname | |! $name | |! $pws) {echo "";}if ($PWS! = $ADMINPWS) {echo "";}if ($NEWPWS! = "") {$conn->execute ("Update [web] set [webname] = ' $webname ', [name] = ' $name ', [PWS] = ' $NEWPWS '");$conn->close (); $conn =null;echo "";}else{$conn

Common command lines for troubleshooting in LINUX

Common command line 1 for troubleshooting in LINUX. view TCP connection status netstat-nat | awk '{print $6}' | sort | uniq-c | sort-rn www.2cto.com netstat-n | awk '/^ tcp/{++ S [$ NF]}; END {for (a in S) print a, S [a]} 'netstat-n | awk'/^ tcp/{++ state [$ NF]}; END {for (key in state) print key, "\ t ", state [key]} 'netstat-n | awk'/^ tcp/{++ arr [$ NF]}; END {for (k in arr) print k, "\ t ", arr [k]} 'netstat-n | awk'/^ tcp/{print $ NF} '| sort | uniq-c | sort-rn netstat-ant | awk' {print $

Linux-related Interview Questions & amp; answers, linux-related questions

Linux-related Interview Questions answers, linux-related questions Linux-related Interview Questions Answers Linux Interview Questions Answers Assume that the apache log format is:118.78.199.98--[09/Jan/2010: 00: 59: 59 + 0800] "GET/Public/Css/index.css HTTP/1.1" 304-"http://www.a.cn/common/index.php" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.3 )" Problem 1: In apachelog, find the top 10 IP addresses with the most accesses.Awk '{print $1}' apache_log | sort | uniq-c | sor

21 Instances of SED

1. Delete the first character of each line of the file.Sed ' s/.//' install.logSed-n ' S/^.//GP '/etc/passwd Sed-nr ' s/(.) (. *)/\2/p '/etc/passwd2. Delete the second character of each line of the file.Sed ' S/.//2 ' install.logSed ' s/(.) (.) (. *)/1\3\/' Install.logSed-nr ' s/(.) (.) (. *)/\1\3/p '/etc/passwd3. Delete the last character of each line of the file.sed ' s/.$//' install.logSed-

Common commands for website server troubleshooting

1. View TCP connection status netstat -nat |awk '{print $6}'|sort|uniq -c|sort -rnnetstat -n | awk '/^tcp/ {++S[$NF]};END {for(a in S) print a, S[a]}'netstat -n | awk '/^tcp/ {++state[$NF]}; END {for(key in state) print key,"\t",state[key]}'netstat -n | awk '/^tcp/ {++arr[$NF]};END {for(k in arr) print k,"\t",arr[k]}'netstat -n |awk '/^tcp/ {print $NF}'|sort|uniq -c|sort -rnnetstat -ant | awk '{print $NF}' | grep -v '[a-z]' | sort | uniq -cnetstat -ant|awk '/ip:80/{split($5,ip,":");++S[ip[1]]}EN

The SED of Shell scripting learning

$ Sed-e '/test/h '-e '/check/x ' example Swaps the pattern space and preserves the contents of the buffer. That is, the line that contains test and check is swapped.Nine, practice1. Delete the first character of each line of the file. Sed-n ' S/^.//GP '/etc/passwd Sed-nr ' s/(.) (. *)/\2/p '/etc/passwd 2. Delete the second character of each line of the file. Sed-nr

Linux System Management Tools SAR (i)

)(4) MAJFLT/S: The number of main pages generated per second(5) pgfree/s: Number of pages per second that are placed in the idle queue(6) pgscank/s: Number of pages scanned by KSWAPD per second(7) pgscand/s: Number of pages scanned directly per second(8) PGSTEAL/S: The number of pages per second that are purged from the cache to meet memory requirements(9)%vmeff: The percentage of pages (Pgsteal) purged per second that are the Total Scan page (Pgscank+pgscand). Monitoring of I nodes, files and

Use Shell to view Apache IP traffic under Linux

1. View TCP connection StatusNetstat-nat |awk ' {print $6} ' |sort|uniq-c|sort-rnNetstat-n | awk '/^tcp/{++s[$NF]}; END {for (a in S) print A, s[a]} 'Netstat-n | awk '/^tcp/{++state[$NF]}; END {for (key in) print key, "T", State[key]} 'Netstat-n | awk '/^tcp/{++arr[$NF]}; END {for (k in arr) print K, "T", arr[k]} 'Netstat-n |awk '/^tcp/{print $NF} ' |sort|uniq-c|sort-rnNetstat-ant | awk ' {print $NF} ' | Grep-v ' [A-z] | Sort | Uniq-cNetstat-ant|awk '/ip:80/{split ($5,ip, ":"); ++s[ip[1]]}end{fo

AWK programming language

tabawk built-in variablesSave the content of Awk's current read releaseFileName to save the file name of awk currently working on filesNR Save the number of rows that awk is currently working onFNR Save the number of rows in the file that awk is currently working onNF Store the number of the current row, column (field) after splitting with the specified split symbol$ ... $n represents the field after the data is split with the specified separatorVariable 1th column $2nd ColumnFS save field spli

Common command lines for troubleshooting in LINUX

a "\ t" COUNT [a] "\ n"} 'www.2cto.com 2. for more than 20 requests, see netstat-anlp | grep 80 | grep tcp | awk '{print $5}' | awk-F: '{print $1}' | sort | uniq-c | sort-nr | head-n20 netstat-ant | awk '/: 80/{split ($5, ip, ":"); ++ A [ip [1]} END {for (I in A) print A [I], i} '| sort-rn | head-n20 3. use tcpdump to sniff access to port 80 to see who has the highest tcpdump-I eth0-tnn dst port 80-c 1000 | awk-F ". "'{print $1 ". "$2 ". "$3 ". "$4}

Phpaccess message board project_php tutorial

again! '); Location = '? Abc = exit '; script ";} Else {$ Conn-> execute ("update [web] set [webname] = '$ webn', [name] =' $ name '");$ Conn-> close (); // $ conn = null;Echo "script" alert ('modification successful! '); Location ='./'; script ";}}?> 【 ]Management Modify data security and exit $ Id = $ _ get ['id'];$ Sj = date ('Y-m-D ');If ($ abc = "add "){$ Nr = $ _ post ['NR

Application of SED in 21 cases

sed jobs:1. Delete the first character of each line of the file.Sed ' s/.//' install.logSed-n ' S/^.//GP '/etc/passwd sed-nr ' s/(.) (. *)/\2/p '/etc/passwd2, delete the second character of each line of the file.Sed ' S/.//2 ' install.logSed ' s/(.) (.) (. *)/1\3\/' Install.logSed-nr ' s/(.) (.) (. *)/\1\3/p '/etc/passwd3. Delete the last character of each line of the file.Sed ' s/.$//' install.logSed-

Common troubleshooting command lines in linux

Common troubleshooting command lines in linux 1. view TCP connection status netstat-nat | awk '{print $6}' | sort | uniq-c | sort-rnnetstat-n | awk '/^ tcp/{++ S [$ NF]}; END {for (a in S) print a, S [a]} 'netstat-n | awk'/^ tcp/{++ state [$ NF]}; END {for (key in state) print key, "\ t ", state [key]} 'www.2cto.com netstat-n | awk'/^ tcp/{++ arr [$ NF]}; END {for (k in arr) print k, "\ t ", arr [k]} 'netstat-n | awk'/^ tcp/{print $ NF} '| sort | uniq-c | sort-rnnetstat-ant | awk' {print $ NF} '

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