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RSS订阅原创 CS APP第三章Ubuntu生成对应汇编代码
昨天晚上在阅读CS APP的时候，忽然发现生成的是Intel风格的代码，而书本上的代码是AT&T风格。编译的时候应该输入gcc -Og -S -masm=att chapter3.c这样的代码才是AT&T风格的。
2024-10-11 09:23:13
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原创 TCP/IP Illustrated Episode 34
Mobility and Handoff Information (MoS and ANDSF)In response to the increased use of mobile computers and smartphones accessing the Internet with cellular technology, frameworks and related DHCP optio...
2024-10-11 09:22:41
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原创 Unix Network Programming Episode 103
#include "unp.h"void str_client(FILE *fp, int sockfd){ pid_t pid; char sendline[MAXLINE], recvline[MAXLINE]; if((pid=Fork())==0) { while(Readline(socfd, recvline, MAXLINE)&...
2024-10-11 09:21:51
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原创 Unix Network Programming Episode 102
if(FD_ISSET(STDIN_FILENO, &rset)) { if((n=read(STDIN_FILENO, toiptr, &to[MAXLINE]-toiptr))<0) { if(errno!=EWOULDBLOCK) err_sys("read...
2024-10-11 09:21:26
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原创 Windows记事本打开某些文件后假死如何处理
后来看到评论上说将默认输入法设置成英文输入法就好了。最近打开了一个超大的文件，导致记事本假死。然后无论我怎么卸载重装这个应用都不行。记录一下，方便以后查询。是英语（美国）输入法。
2024-09-03 09:07:18
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原创 TCP/IP Illustrated Episode 33
Lease Query and Bulk Lease QueryIn some environments it is useful to allow a third-party system (such as a relay or access concentrator) to learn the address bindings for a particular DHCP client. Th...
2024-09-03 09:06:43
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原创 Unix Network Programming Episode 101
在这里插入代码片str_echo function: asks for client’s credentials
2024-09-03 09:06:13
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原创 Unix Network Programming Episode 100
Receiving Sender CredentialsIn Figure 14.13(See 9.3.6), we showed another type of data that can be passed along a Unix domain socket as ancillary data: user credentials. Exactly how credentials are p...
2024-09-03 09:05:54
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原创 Windows编译Boost需要注意的问题
如果你想用2022，需要搜索msvc.jam文件并根据链接。如果你想不修改文件，就装个2019，效果是一样的。增加对2022版本的支持。
2024-08-05 13:16:12
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原创 TCP/IP Illustrated Episode 32
Protocol OperationThe DHCPv6 protocol operates much like its DHCPv4 counterpart. Whether or not a client initiates the use of DHCP is dependent on configuration options carried in an ICMPv6 Router Ad...
2024-08-05 13:15:27
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原创 Unix Network Programming Episode 99
#include "unp.h"ssize_t read_fd(int fd, void *ptr, size_t nbytes, int *recvfd){ struct msghdr msg; struct iovec iov[1]; ssize_t n;#ifdef HAVE_MSGHDR_MSG_CONTROL union{ str...
2024-08-05 13:14:59
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原创 Unix Network Programming Episode 98
#include "unp.h"int my_open(const char *, int);int main(int argc, char **argv){ int fd, n; char buff[BUFFSIZE]; if(argc!=2) err_quit("usage: mycat <pathname>"); ...
2024-08-05 13:14:42
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原创 旧版本Compose项目如何迁移到Koltin 2.0版本
除了删除composeOptions外，链接给出了使用libs.versions.toml的方法。并不是说官方给的教程不好，而是有很多旧版本的gradle文件没有做这样的配置。1.非常老的，以buildscript为顶级节点的，修改如下。所以就为老版本提供相关迁移方法，并做具体记录。对应模块的build.gradle增加。2.较新的，以plugin为根节点的。
2024-07-01 10:48:37
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原创 TCP/IP Illustrated Episode 31
NoteThere has been some difficulty in Windows environments regarding the use of the broadcast flag. Windows XP and Windows 7 DHCP clients do not set the flag, but Windows Vista clients do. Some DHCP...
2024-07-01 10:47:35
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原创 Unix Network Programming Episode 97
Unix Domain Datagram Client/Server#include "unp.h"int main(int argc, char **argv){ int sockfd; struct sockaddr_un servaddr; sockfd=Socket(AF_LOCAL, SOCK_STREAM,0); bzero(&ser...
2024-07-01 10:47:09
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原创 Unix Network Programming Episode 96
‘socketpair’ FunctionThe socketpair function creates two sockets that are then connected together. This function applies only to Unix domain sockets.#include &lt;sys/socket.h&gt;int socketpair(int ...
2024-07-01 10:46:52
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原创 TCP/IP Illustrated Episode 30
Attacks Involving IPThere have been a number of attacks on the IP protocol over the years, based primarily on the operation of options, or by exploiting bugs in specialized code (such as fragment rea...
2024-06-03 14:00:46
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原创 TCP/IP Illustrated Episode 29
Host ModelsAlthough it may appear to be a straightforward decision to determine whether a received unicast datagram matches one of a host’s IP addresses and should be processed, this decision depends...
2024-06-03 14:00:24
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原创 Unix Network Programming Episode 95
Unix Domain ProtocolsIntroductionThe Unix domain protocols are not an actual protocol suite, but a way of performing client/server communication on a single host using the same API that is used for ...
2024-06-03 13:59:56
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原创 Unix Network Programming Episode 94
The kqueue interface includes the following two functions and macro:#include &lt;sys/types.h&gt;#include &lt;sys/event.h&gt;#include &lt;sys/time.h&gt;int kqueue(void);int kevent(int kq, const st...
2024-06-03 13:59:45
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原创 Leetcode 547 Number of Provinces
There are n cities. Some of them are connected, while some are not. If city a is connected directly with city b, and city b is connected directly with city c, then city a is connected indirectly with city c.A province is a group of directly or indirectly
2024-05-06 13:18:41
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原创 TCP/IP Illustrated Episode 28
DiscussionIn the examples we have just seen there are a few key points that should be kept in mind regarding the operation of IP unicast forwarding:1.Most of the hosts and routers in this example us...
2024-05-06 13:17:57
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原创 Unix Network Programming Episode 93
The problem here is the buffering performed automatically by the standard I/O library on the server. There are three types of buffering performed by the standard I/O library:1.Fully buffered means th...
2024-05-06 13:16:59
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原创 Unix Network Programming Episode 92
The difference between CMSG_LEN and CMSG_SPACE is that the former does not account for any padding following the data portion of the ancillary data object and is therefore the value to store in cmsg_l...
2024-05-06 13:16:44
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原创 LeetCode 2041 Accepted Candidates From the Interviews
答案select candidate_idfrom Candidates cjoin Rounds r on c.interview_id = r.interview_idgroup by candidate_id, years_of_exphaving years_of_exp >= 2 and sum(score) >= 16
2024-04-07 11:02:08
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原创 TCP/IP Illustrated Episode 27
Fragment HeaderThe Fragment header is used by an IPv6 source when sending a datagram larger than the path MTU of the datagram’s intended destination. Path MTU and how it is determined are discussed i...
2024-04-07 11:01:46
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原创 Unix Network Programming Episode 91
Both functions package most arguments into a msghdr structure.struct msghdr { void *msg_name; /* protocol address */ socklen_t msg_namelen; /* size of protocol address */ struct iovec *msg_iov; /*...
2024-04-07 11:01:18
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原创 Unix Network Programming Episode 90
#include &amp;quot;unp.h&amp;quot;int readable_timeo(int fd, int second){ fd_set rset; struct timeval tv; FD_ZERO(&amp;amp;amp;rset); FD_SET(fd, &amp;amp;amp;rset); tv.tv_sec=second; t
2024-04-07 11:01:01
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原创 TCP/IP Illustrated Episode 26
Pad1 and PadNIPv6 options are aligned to 8-byte offsets, so options that are naturally smaller are padded with 0 bytes to round out their lengths to the nearest 8 bytes. Two padding options are avail...
2024-03-04 17:51:11
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原创 Unix Network Programming Episode 89
Advanced I/O FunctionsIntroductionThis chapter covers a variety of functions and techniques that we lump into the category of “advanced I/O.” First is setting a timeout on an I/O operation, which ca...
2024-03-04 17:50:41
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原创 Unix Network Programming Episode 88
‘inetd’ DaemonOn a typical Unix system, there could be many servers in existence, just waiting for a client request to arrive. Examples are FTP, Telnet, Rlogin, TFTP, and so on. With systems before 4...
2024-03-04 17:50:24
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原创 TCP/IP Illustrated Episode 25
Mathematics of the Internet ChecksumFor the mathematically inclined, the set of 16-bit hexadecimal values V = {0001, . . . , FFFF} and the one’s complement sum operation + together form an Abelian gr...
2024-02-02 09:14:29
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原创 TCP/IP Illustrated Episode 24
Using ARP to Set an Embedded Device’s IPv4 AddressAs more embedded devices are made compatible with Ethernet and the TCP/IP protocols, it is increasingly common to find network-attached devices that ...
2024-02-02 09:13:30
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原创 Unix Network Programming Episode 87
‘daemon_init’ FunctionFigure 13.4 shows a function named daemon_init that we can call (normally from a server) to daemonize the process. This function should be suitable for use on all variants of Un...
2024-02-02 09:12:57
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原创 Unix Network Programming Episode 86
Source Code PortabilityMost existing network applications are written assuming IPv4. sockaddr_in structures are allocated and filled in and the calls to socket specify AF_INET as the first argument. ...
2024-02-02 09:12:33
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原创 Swift 5将AnyObject转成String
let valueData=try! JSONSerialization.data(withJSONObject: value)let valueString=String(data: valueData, encoding: .utf8)
2024-01-12 11:50:01
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原创 TCP/IP Illustrated Episode 23
ARP CacheEssential to the efficient operation of ARP is the maintenance of an ARP cache (or table) on each host and router. This cache maintains the recent mappings from network-layer addresses to ha...
2024-01-12 11:49:39
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原创 Unix Network Programming Episode 85
‘gethostbyname_r’ and ‘gethostbyaddr_r’ FunctionsThere are two ways to make a nonre-entrant function such as gethostbyname re-entrant.1.Instead of filling in and returning a static structure, the ca...
2024-01-12 11:49:12
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原创 Unix Network Programming Episode 84
#include "unp.h"#include &lt;time.h&gt;int main(int argc, char **argv){ int sockfd; ssize_t n; char buff[MAXLINE]; time_t ticks; socklen_t len; struct sockaddr_storage clie...
2024-01-12 11:48:56
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