oss bss

Environment: Linux,redhatWhen a program is compiled into an executable file, it is divided into sections of code, data segments, stacks,. BSS, heaps, and so on.The functions of each paragraph are:1. Code snippet (. Text): Code, Global constant (const), read-only variable and string constant (possibly in the code snippet, generally placed in the read-only data " . Rodata" section, and possibly in the ". Data" segment).2. Data segment (.): Global variab

Center Frequency (MHz) channel low/High frequency 1 2412 2401/2423 2 2417 2406/2428 3 2422 2411/2433 4 2427 2416/2438 5 2432 2421/2443 6 2437 2426/2448 7 2442 2431/2453 8 2447 2426/2448 9 2452 2441/2463 Ten 2457 2446/2468 One 2462 2451/2473 of 2467

original link: http://blog.csdn.net/myarrow/article/details/9306961 1.802.11 management function – User access process STA (workstation) to start initialization, formal use, AP transfer data frame before, to go through three stages to access: (1) scan (SCAN)(2) Certification (authentication) (3) Association (Association) 1.1 802.11 admin – scan (SCAN) 1 if the wireless site STA set into Ad-hoc (no AP) mode: The STA first looks for IBSS (the same SSID to which the STA belongs) and, if so, parti

For a C language program, the memory space consists primarily of five parts of the code segment (. Text), the data segment (. data), the BSS segment (. BSS), the heap and the stack, where code snippets, data segments, and BSS segments are compiled by the compiler, and the heap and stack are allocated by the system when the program runs. The layout is as follows

1. View the user branch level:runlevel (total six: 0-6,0 shutdown, 1 single user, 2 multi-user (without Network File system NFS), 3 multi-user (full-featured), 4 reserved, 5 interface (desktop), 6 restart)Default mode modification in:Vim/etc/inittab can see the relevant instructions and modifications.Id:3:initdefault:Init (0-6) can , for the shutdown Restart interface, interchange, etc.;2. Single-User mode entryAfter the boot, will be in the system, stop the system for three seconds, and then, w

First, installation LAMP Environment:# yum-y Install httpd mariadb-server php-mysql phpPackage version:httpd:2.4.6mariadb-server:5.5.56 php-mysql( The driver to use when php connects to MySQL ): 5.4.16php:5.4.16Note:CentOS 7.4 is no longer available Mysql-server the packagehttpd configuration file:1. Main configuration file:/etc/httpd/conf/httpd.conf2. Auxiliary configuration file:/etc/httpd/conf.d/*.conf3. Module configuration file:/etc/httpd/conf.modules.d/*.confMARIADB configuration file:/et

* (. Text) Other code segments }. = Align (4 ); . Rodata: {* (. rodata)} specifies the read-only data segment. = align (4 ); . Data: {* (. Data)} specifies the read/write data segment. = align (4 ); . Got :{*(. got)} specifies the got segment. The got segment is a custom segment of uboot, and the non-standard segment _ u_boot_cmd_start = .; the value is assigned to the current position, that is, the starting position. . U_boot_cmd: {* (. u_boot_cmd)} u_boot_cmd segment. uboot puts all uboot com

(. Text): http://www.cnblogs.com/nibuyaoni/p/5724013.htmlWe then compile the linker with makefile to specify that the code should be linked in the order of the linked script: arm-linux-ld-tlink.lds -o led.elf $^Link.lds is the name of the link script1 SECTIONS2 {3. =0x20000000; Specify a link address of 0x200000004 5 . Text: {//code snippet6 START.O//Specify the order of links for:start.o->sdram_init.o-> other files7 SDRAM_INIT.O8*(. Text)//Here are some other. o Files9 }Ten

) operations--it is not writable.Data Segment : A data segment is used to hold a global variable initialized in an executable file, in other words, a variable and a global variable that holds the program statically assigned [1].BSS segment [2]: The BSS segment contains uninitialized global variables in the program, all zeros in the in-memory BSS segment.Heap (Hea

For a C language program, the memory space consists mainly of five parts of the code snippet (. Text), data segment (. data), BSS segment (. BSS), heap and stack, where the code snippet, data segment, and BSS segment are compiled by the compiler, and the heap and stack are allocated by the system when the program runs. The layout is as followsIn, the address spac

. The two-channel, also known as stereo, has two lines in the hardware, with better sound quality and timbre than mono, but the amount of storage space occupied by digitizing is one-fold more than mono.Second, sound card driverFor security reasons, applications under Linux cannot operate directly on a hardware device such as a sound card, but must pass through a kernel-supplied driver to complete it. The essence of audio programming on Linux is to use a driver to complete various operations on t

Safe conversion In the ADMT tools console, right-click the Ad Migration Tool and select the Security Conversion Wizard. 650) this.width=650; "src=" Http://s3.51cto.com/oss/201711/12/50aa894908c7711c92c8acb4897cac2a.png "/> Click Next650) this.width=650; "src=" Http://s3.51cto.com/oss/201711/12/d4c1c221daa868712bb712ed6a530866.png "/> Select the previously migrated object and click Next65

The hardware needs to be configured, including CPU, memory, NIC, disk, mirror, etc. These in the previous study we can automatically create through the script. After configuring the hardware, start the installation, there are many options we need to manually select, so we can also create automatic answer script. This allows us to implement a virtual machine configuration installation via an instruction that is fully automated and unattended.1. Build a good yum source;2. Install kickstart;650) th