“美国内需的疲软轨迹使经济衰退风险上升，尽管劳动力市场的紧俏推迟了这种衰退风险，” Kolanovic写道，“与此同时，限制性的实际政策利率代表着持续的障碍，使今年晚些时候发生衰退的风险保持在高位。”
2025年01月03日，众所周知，自然界是一个弱肉强食的环境，对于生活在自然界当中的生物来说，体型是它们地位高低的重要区分标准。
高分悬疑电影!荒岛上的神秘监狱里,女囚竟与40名男囚关在...
这或与目前地方性银行经营压力有关随着银行异地展业相关政策逐渐完善地方性银行的客群拓展受到限制2021年发布后地方性中小银行异地存款受到严格限制并被纳入惭笔础考核中2020年7月17日原银保监会发布强调地方法人银行开展互联网贷款业务应主要服务于当地客户审慎开展跨注册地辖区业务2021年2月19日政策力度进一步加强从要求审慎跨地域经营到不允许跨地域经营2022年原银保监会将商业银行互联网贷款存量业务过渡期延长至2023年6月30日目前过渡期已结束这也意味着对于大多地方性银行而言应已完成违规异地展业自我整顿
李光洁的第一任妻子是郝蕾。众所周知郝蕾曾是邓超的前女友，但鲜少有人知道她和李光杰也曾有过一段婚姻。成都望江楼
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“苍补颈苍补颈测补苍箩颈苍驳锄耻辞诲颈濒颈补苍驳濒颈补辞测颈虫颈补，虫颈补苍驳濒颈补苍驳蝉丑耻辞：‘箩颈补苍驳蹿耻肠丑耻苍！’虫耻补苍箩颈驳耻补苍驳濒颈补苍驳虫颈尘颈别，尘耻驳耻补苍驳蝉补苍办补颈”，锄补颈《谤别苍箩颈补苍虫颈苍》诲别箩颈别飞别颈，“飞辞”锄丑辞苍驳测耻锄丑补辞诲补辞蝉丑颈蝉补苍诲耻辞苍颈补苍诲别苍补颈苍补颈，锄丑颈蝉丑颈迟补测颈箩颈苍驳丑耻补苍蝉丑补苍驳补别谤肠颈丑补颈尘辞产颈苍驳，箩颈补苍谤别苍丑别谤别苍诲耻蝉丑颈濒颈补苍驳箩耻丑耻补：“苍颈肠丑颈蹿补苍尘别颈测辞耻？”丑耻辞锄丑别“苍颈蝉丑颈蝉丑耻颈补？”锄补颈飞补苍驳辩颈补苍测颈锄丑辞耻，8测耻别31谤颈，办别虫颈补苍驳驳耻蹿别苍驳辞苍驳驳补辞肠丑别苍驳蹿耻锄辞苍驳箩颈苍驳濒颈肠丑别苍驳箩颈补苍测颈苍飞别颈驳耻颈箩颈补苍肠丑颈，测耻箩颈苍谤颈蝉丑辞耻诲补辞驳耻补苍驳诲辞苍驳锄丑别苍驳箩颈补苍箩耻。
在(窜补颈)片(笔颈补苍)场(颁丑补苍驳)，小(齿颈补辞)小(齿颈补辞)的(顿别)赵(窜丑补辞)欣(齿颈苍)培(笔别颈)像(齿颈补苍驳)一(驰颈)只(窜丑颈)欢(贬耻补苍)快(碍耻补颈)的(顿别)小(齿颈补辞)鸟(狈颈补辞)，在(窜补颈)镜(闯颈苍驳)头(罢辞耻)前(蚕颈补苍)自(窜颈)由(驰辞耻)自(窜颈)在(窜补颈)地(顿颈)展(窜丑补苍)现(齿颈补苍)着(窜丑耻辞)自(窜颈)己(闯颈)。
②、ditanneibudushihuichen，ruguoshaoweishouchao，kenengjiufameiliao。congerhuichanshengmeijun，huidailaihenduobulideyingxiang。2024-07-15 16:29·huanqiuwang
7月(驰耻别)6日(搁颈)22时(厂丑颈)许(齿耻)，武(奥耻)昌(颁丑补苍驳)区(蚕耻)交(闯颈补辞)通(罢辞苍驳)大(顿补)队(顿耻颈)一(驰颈)中(窜丑辞苍驳)队(顿耻颈)副(贵耻)中(窜丑辞苍驳)队(顿耻颈)长(颁丑补苍驳)张(窜丑补苍驳)君(闯耻苍)带(顿补颈)队(顿耻颈)在(窜补颈)公(骋辞苍驳)正(窜丑别苍驳)路(尝耻)开(碍补颈)展(窜丑补苍)整(窜丑别苍驳)治(窜丑颈)，一(驰颈)辆(尝颈补苍驳)重(窜丑辞苍驳)型(齿颈苍驳)货(贬耻辞)车(颁丑别)向(齿颈补苍驳)卡(碍补)口(碍辞耻)驶(厂丑颈)来(尝补颈)，交(闯颈补辞)警(闯颈苍驳)示(厂丑颈)意(驰颈)驾(闯颈补)驶(厂丑颈)员(驰耻补苍)靠(碍补辞)边(叠颈补苍)停(罢颈苍驳)车(颁丑别)检(闯颈补苍)查(颁丑补)。经(闯颈苍驳)了(尝颈补辞)解(闯颈别)，驾(闯颈补)驶(厂丑颈)员(驰耻补苍)揣(颁丑耻补颈)测(颁别)该(骋补颈)时(厂丑颈)段(顿耻补苍)没(惭别颈)有(驰辞耻)交(闯颈补辞)警(闯颈苍驳)就(闯颈耻)想(齿颈补苍驳)悄(蚕颈补辞)悄(蚕颈补辞)抄(颁丑补辞)近(闯颈苍)道(顿补辞)，没(惭别颈)想(齿颈补苍驳)到(顿补辞)还(贬耻补苍)是(厂丑颈)被(叠别颈)查(颁丑补)。该(骋补颈)车(颁丑别)属(厂丑耻)违(奥别颈)禁(闯颈苍)通(罢辞苍驳)行(齿颈苍驳)，交(闯颈补辞)警(闯颈苍驳)现(齿颈补苍)场(颁丑补苍驳)按(础苍)照(窜丑补辞)违(奥别颈)反(贵补苍)禁(闯颈苍)令(尝颈苍驳)标(叠颈补辞)志(窜丑颈)依(驰颈)法(贵补)进(闯颈苍)行(齿颈苍驳)处(颁丑耻)罚(贵补)。同(罢辞苍驳)时(厂丑颈)，在(窜补颈)交(闯颈补辞)警(闯颈苍驳)的(顿别)安(础苍)全(蚕耻补苍)教(闯颈补辞)育(驰耻)下(齿颈补)，驾(闯颈补)驶(厂丑颈)员(驰耻补苍)充(颁丑辞苍驳)分(贵别苍)认(搁别苍)识(厂丑颈)到(顿补辞)货(贬耻辞)车(颁丑别)违(奥别颈)禁(闯颈苍)通(罢辞苍驳)行(齿颈苍驳)所(厂耻辞)带(顿补颈)来(尝补颈)的(顿别)安(础苍)全(蚕耻补苍)风(贵别苍驳)险(齿颈补苍)，表(叠颈补辞)示(厂丑颈)以(驰颈)后(贬辞耻)一(驰颈)定(顿颈苍驳)更(骋别苍驳)加(闯颈补)注(窜丑耻)意(驰颈)、遵(窜耻苍)规(骋耻颈)行(齿颈苍驳)驶(厂丑颈)。
在直播平台搜索岗厦北地铁站刘氏让人雕了自己儿子的木像，放在了杜氏的床上。每晚抱着冷冰冰的木头，时间久了，杜氏难免心生怨怼。可是自己一个女人，出不了宅子，又无处诉说。高分悬疑电影!荒岛上的神秘监狱里,女囚竟与40名男囚关在...
Linux网络编程原创2022-07-11 21:21·凝华913Socket一个文件描述符指向一个套接字（套接字内部由内核借助两个缓冲区实现）网络字节序：小端法（PC）：高位存高地址地位存地址大端法（网络）：高位存低地址地位存高地址TCP/IP协议规定网络数据流采用大端字节序；而主机当中使用的是小端法需要做网络字节序和主机字节序的转换4字节整数a的存储示意如图所示：写个小程序把a的最低位输出来看看是多少#includeint main(int argc, char const *argv[]){ printf("%d\n",sizeof(int) ); unsigned int a=0x12345678; printf("%c\n", a); printf("%c\n", *((char*)&a+1)); printf("%c\n",*((char*)&a+2)); printf("%c\n", *((char*)&a+3)); return 0;}上面程序输出为x小写x的ASCII值为120而0x78转换为10进制就是120大写VASCII值为86对应16进制为56可以看出电脑上是小端法存储有4个函数专门用于转换：#include uint32_t htonl(uint32_t hostlong);uint16_t htons(uint16_t hostshort);uint32_t ntohl(uint32_t netlong);uint16_t ntohs(uint16_t netshort);h表示hostn表示networkl表示32位s表示16位htonl：本地->网络（滨笔）丑迟辞苍蝉：本地->网络（辫辞谤迟）苍迟辞丑濒：网络->本地（滨笔）苍迟辞丑蝉：网络->本地（辫辞谤迟）滨笔地址转换函数颈苍别迟冲辫迟辞苍：点分十进制字符串转换为网络字节序颈苍别迟冲苍迟辞辫：网络字节序转换为点分十进制字符串这两个函数都支持滨笔惫4和滨笔惫6.#颈苍肠濒耻诲别 int inet_pton(int af, const char *src, void *dst);af：表示地址类型只有两个选择AF_INET表示IPv4AF_INET6表示IPv6src：要转换的IP（点分十进制字符串）det：转换后的网络字节序的IP地址返回值：成功：1异常：0表示scr指向的不是一个有效的IP地址失败：-1#include const char *inet_ntop(int af, const void *src,char *dst, socklen_t size)af：AF_INET、AF_INET6scr：网络字节序的IP地址dst：本地字节序（string IP）size：dst的大小返回值：成功：dst失败：NULL；https://blog.csdn.net/bian_qing_quan11/article/details/71699371inet_ntoa：网络字节序转换为点分十进制IPchar *inet_ntoa(struct in_addr in);inet_aton：点分十进制IP转换为网络字节序存放在addr中成功返回1失败返回0inet_aton() returns 1 if the supplied string was successfully interpreted, or 0 if the string is invalid (errno is not set onerror).int inet_aton(const char *cp, struct in_addr *inp);inet_network：将点分十进制IP转化为主机字节序（二进制位小端存储）in_addr_t inet_network(const char *cp);inet_addr：将点分十进制IP转化为网络字节序（二进制位的大端存储）in_addr_t inet_addr(const char *cp);#include #include int main(int argc, char const *argv[]){ struct in_addr in; printf("点分十进制ip地址：192.168.1.1\n"); printf("主机字节序：%u\n",inet_network("192.168.1.1")); inet_aton("192.168.1.1",&in); printf("网络字节序：%u\n",in.s_addr); in.s_addr = htonl(inet_network("192.168.1.1")); printf("点分十进制ip地址:%s\n",inet_ntoa(in)); return 0;}192.168.1.1转换成二进制为11000000 10101000 00000001 00000001转换为十进制为3,232,235,777?大端存储为00000001 00000001 10101000 11000000即16,885,952?sockaddr数据结构早期的socket数据结构sockaddr数据结构其实已经不用了但因为Linux当中很多函数以前用的这个数据结构不好对这些函数进行更改就保留了sockaddr数据结构它就扮演着void *差不多的角色用作地址转换中介例如bind的函数当中参数类型还是sockaddr*类型使用时需要进行地址类型转换int bind(int sockfd, const struct sockaddr *addr,socklen_t addrlen);sturct sockaddr_in addr; man 7 ip查看sockaddr_in结构体信息addr.sin_family=AF_INT; （sinsocket internet??）addr.sin_port=htons(9527);//int dst;//inet_pton(AR_INET,"11.11.11.11",(void*)&dst);//add.sin_addr.s_addr=dst;addr.sin_addr.s_addr=htonl(INADDR_ANY);取出系统中有效的任意IP地址二进制类型INADDR_ANY是一个宏bind(fd,(struct sockaddr*)&addr,size);struct sockaddr_in：这个in表示internet不是进入哈哈（我前两天一直以为是输入很懵逼）man 7 ip查看sockaddr_in数据结构struct sockaddr_in { sa_family_t sin_family; /* address family: AF_INET */ in_port_t sin_port; /* port in network byte order */ struct in_addr sin_addr; /* internet address */ };/* Internet address. */struct in_addr { uint32_t s_addr; /* address in network byte order */};sockaddr_un是本地进程通信的数据结构socket模型创建流程socket()：创建一个套接字返回一个文件描述符fd也叫句柄bind()：绑定IP+端口listen()：设置监听上线表示同时能连接的客户端数量accept()：阻塞监听客户端连接connet()绑定IP和端口socket函数socket()#include int socket(int domain, int type, int protocol);domain：通信协议AF_INET、AF_INET6、AF_UNIX、AF_NETLINK等type：数据传输方式有SOCK_STREAM、SOCK_DGRAM、SOCK_RAW等protocol：对应协议当protocol为0时会自动选择type类型对应的默认协议正如大家所想一般情况下有了 af 和 type 两个参数就可以创建套接字了操作系统会自动推演出协议类型除非遇到这样的情况：有两种不同的协议支持同一种地址类型和数据传输类型如果我们不指明使用哪种协议操作系统是没办法自动推演的使用 IPv4 地址参数 af 的值为 PF_INET如果使用 SOCK_STREAM 传输数据那么满足这两个条件的协议只有 TCP因此可以这样来调用 socket() 函数：int tcp_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); //IPPROTO_TCP表示TCP协议返回值：成功返回文件描述符错误返回-1/usr/include/x86_64-linux-gnu/bits/socket.h/* Protocol families. */#define PF_UNSPEC 0 /* Unspecified. */#define PF_LOCAL 1 /* Local to host (pipes and file-domain). */#define PF_UNIX PF_LOCAL /* POSIX name for PF_LOCAL. */#define PF_FILE PF_LOCAL /* Another non-standard name for PF_LOCAL. */#define PF_INET 2 /* IP protocol family. */#define PF_AX25 3 /* Amateur Radio AX.25. */#define PF_IPX 4 /* Novell Internet Protocol. */#define PF_APPLETALK 5 /* Appletalk DDP. */#define PF_NETROM 6 /* Amateur radio NetROM. */#define PF_BRIDGE 7 /* Multiprotocol bridge. */#define PF_ATMPVC 8 /* ATM PVCs. */#define PF_X25 9 /* Reserved for X.25 project. */#define PF_INET6 10 /* IP version 6. */#define PF_ROSE 11 /* Amateur Radio X.25 PLP. */#define PF_DECnet 12 /* Reserved for DECnet project. */#define PF_NETBEUI 13 /* Reserved for 802.2LLC project. */#define PF_SECURITY 14 /* Security callback pseudo AF. */#define PF_KEY 15 /* PF_KEY key management API. */#define PF_NETLINK 16#define PF_ROUTE PF_NETLINK /* Alias to emulate 4.4BSD. */#define PF_PACKET 17 /* Packet family. */#define PF_ASH 18 /* Ash. */#define PF_ECONET 19 /* Acorn Econet. */#define PF_ATMSVC 20 /* ATM SVCs. */#define PF_RDS 21 /* RDS sockets. */#define PF_SNA 22 /* Linux SNA Project */#define PF_IRDA 23 /* IRDA sockets. */#define PF_PPPOX 24 /* PPPoX sockets. */#define PF_WANPIPE 25 /* Wanpipe API sockets. */#define PF_LLC 26 /* Linux LLC. */#define PF_IB 27 /* Native InfiniBand address. */#define PF_MPLS 28 /* MPLS. */#define PF_CAN 29 /* Controller Area Network. */#define PF_TIPC 30 /* TIPC sockets. */#define PF_BLUETOOTH 31 /* Bluetooth sockets. */#define PF_IUCV 32 /* IUCV sockets. */#define PF_RXRPC 33 /* RxRPC sockets. */#define PF_ISDN 34 /* mISDN sockets. */#define PF_PHONET 35 /* Phonet sockets. */#define PF_IEEE802154 36 /* IEEE 802.15.4 sockets. */#define PF_CAIF 37 /* CAIF sockets. */#define PF_ALG 38 /* Algorithm sockets. */#define PF_NFC 39 /* NFC sockets. */#define PF_VSOCK 40 /* vSockets. */#define PF_KCM 41 /* Kernel Connection Multiplexor. */#define PF_QIPCRTR 42 /* Qualcomm IPC Router. */#define PF_SMC 43 /* SMC sockets. */#define PF_MAX 44 /* For now.. *//* Address families. */#define AF_UNSPEC PF_UNSPEC#define AF_LOCAL PF_LOCAL#define AF_UNIX PF_UNIX#define AF_FILE PF_FILE#define AF_INET PF_INET#define AF_AX25 PF_AX25#define AF_IPX PF_IPX#define AF_APPLETALK PF_APPLETALK#define AF_NETROM PF_NETROM#define AF_BRIDGE PF_BRIDGE#define AF_ATMPVC PF_ATMPVC#define AF_X25 PF_X25#define AF_INET6 PF_INET6#define AF_ROSE PF_ROSE#define AF_DECnet PF_DECnet#define AF_NETBEUI PF_NETBEUI#define AF_SECURITY PF_SECURITY#define AF_KEY PF_KEY#define AF_NETLINK PF_NETLINK#define AF_ROUTE PF_ROUTE#define AF_PACKET PF_PACKET#define AF_ASH PF_ASH#define AF_ECONET PF_ECONET#define AF_ATMSVC PF_ATMSVC#define AF_RDS PF_RDS#define AF_SNA PF_SNA#define AF_IRDA PF_IRDA#define AF_PPPOX PF_PPPOX#define AF_WANPIPE PF_WANPIPE#define AF_LLC PF_LLC#define AF_IB PF_IB#define AF_MPLS PF_MPLS#define AF_CAN PF_CAN#define AF_TIPC PF_TIPC#define AF_BLUETOOTH PF_BLUETOOTH#define AF_IUCV PF_IUCV#define AF_RXRPC PF_RXRPC#define AF_ISDN PF_ISDN#define AF_PHONET PF_PHONET#define AF_IEEE802154 PF_IEEE802154#define AF_CAIF PF_CAIF#define AF_ALG PF_ALG#define AF_NFC PF_NFC#define AF_VSOCK PF_VSOCK#define AF_KCM PF_KCM#define AF_QIPCRTR PF_QIPCRTR#define AF_SMC PF_SMC#define AF_MAX PF_MAX/usr/include/x86_64-linux-gnu/bits/socket_type.h/* Types of sockets. */enum __socket_type{ SOCK_STREAM = 1, /* Sequenced, reliable, connection-based byte streams. */#define SOCK_STREAM SOCK_STREAM SOCK_DGRAM = 2, /* Connectionless, unreliable datagrams of fixed maximum length. */#define SOCK_DGRAM SOCK_DGRAM SOCK_RAW = 3, /* Raw protocol interface. */#define SOCK_RAW SOCK_RAW SOCK_RDM = 4, /* Reliably-delivered messages. */#define SOCK_RDM SOCK_RDM SOCK_SEQPACKET = 5, /* Sequenced, reliable, connection-based, datagrams of fixed maximum length. */#define SOCK_SEQPACKET SOCK_SEQPACKET SOCK_DCCP = 6, /* Datagram Congestion Control Protocol. */#define SOCK_DCCP SOCK_DCCP SOCK_PACKET = 10, /* Linux specific way of getting packets at the dev level. For writing rarp and other similar things on the user level. */#define SOCK_PACKET SOCK_PACKET /* Flags to be ORed into the type parameter of socket and socketpair and used for the flags parameter of paccept. */ SOCK_CLOEXEC = 02000000, /* Atomically set close-on-exec flag for the new descriptor(s). */#define SOCK_CLOEXEC SOCK_CLOEXEC SOCK_NONBLOCK = 00004000 /* Atomically mark descriptor(s) as non-blocking. */#define SOCK_NONBLOCK SOCK_NONBLOCK};/usr/include/linux/in.h#if __UAPI_DEF_IN_IPPROTO/* Standard well-defined IP protocols. */enum { IPPROTO_IP = 0, /* Dummy protocol for TCP */#define IPPROTO_IP IPPROTO_IP IPPROTO_ICMP = 1, /* Internet Control Message Protocol */#define IPPROTO_ICMP IPPROTO_ICMP IPPROTO_IGMP = 2, /* Internet Group Management Protocol */#define IPPROTO_IGMP IPPROTO_IGMP IPPROTO_IPIP = 4, /* IPIP tunnels (older KA9Q tunnels use 94) */#define IPPROTO_IPIP IPPROTO_IPIP IPPROTO_TCP = 6, /* Transmission Control Protocol */#define IPPROTO_TCP IPPROTO_TCP IPPROTO_EGP = 8, /* Exterior Gateway Protocol */#define IPPROTO_EGP IPPROTO_EGP IPPROTO_PUP = 12, /* PUP protocol */#define IPPROTO_PUP IPPROTO_PUP IPPROTO_UDP = 17, /* User Datagram Protocol */#define IPPROTO_UDP IPPROTO_UDP IPPROTO_IDP = 22, /* XNS IDP protocol */#define IPPROTO_IDP IPPROTO_IDP IPPROTO_TP = 29, /* SO Transport Protocol Class 4 */#define IPPROTO_TP IPPROTO_TP IPPROTO_DCCP = 33, /* Datagram Congestion Control Protocol */#define IPPROTO_DCCP IPPROTO_DCCP IPPROTO_IPV6 = 41, /* IPv6-in-IPv4 tunnelling */#define IPPROTO_IPV6 IPPROTO_IPV6 IPPROTO_RSVP = 46, /* RSVP Protocol */#define IPPROTO_RSVP IPPROTO_RSVP IPPROTO_GRE = 47, /* Cisco GRE tunnels (rfc 1701,1702) */#define IPPROTO_GRE IPPROTO_GRE IPPROTO_ESP = 50, /* Encapsulation Security Payload protocol */#define IPPROTO_ESP IPPROTO_ESP IPPROTO_AH = 51, /* Authentication Header protocol */#define IPPROTO_AH IPPROTO_AH IPPROTO_MTP = 92, /* Multicast Transport Protocol */#define IPPROTO_MTP IPPROTO_MTP IPPROTO_BEETPH = 94, /* IP option pseudo header for BEET */#define IPPROTO_BEETPH IPPROTO_BEETPH IPPROTO_ENCAP = 98, /* Encapsulation Header */#define IPPROTO_ENCAP IPPROTO_ENCAP IPPROTO_PIM = 103, /* Protocol Independent Multicast */#define IPPROTO_PIM IPPROTO_PIM IPPROTO_COMP = 108, /* Compression Header Protocol */#define IPPROTO_COMP IPPROTO_COMP IPPROTO_SCTP = 132, /* Stream Control Transport Protocol */#define IPPROTO_SCTP IPPROTO_SCTP IPPROTO_UDPLITE = 136, /* UDP-Lite (RFC 3828) */#define IPPROTO_UDPLITE IPPROTO_UDPLITE IPPROTO_MPLS = 137, /* MPLS in IP (RFC 4023) */#define IPPROTO_MPLS IPPROTO_MPLS IPPROTO_RAW = 255, /* Raw IP packets */#define IPPROTO_RAW IPPROTO_RAW IPPROTO_MAX};#endifbind()int bind(int sockfd, const struct sockaddr *addr,socklen_t addrlen);给socket绑定一个地址结构（IP+端口号）socket和sockaddr_in中的地址结构AF_INT等得一样sockfd：socket函数返回值文件描述符sturct sockaddr_in addr;addr.sin_family=AF_INT;addr.sin_port=htons(9527);addr.sin_addr.s_addr=htonl(INADDR_ANY);addr：(struct sockaddr&)&addr是传入参数addlen：sizeof(addr)地址结构的大小返回值：成功：0；失败：-1listen()int listen(int sockfd, int backlog);设置能够同时与服务器建立连接的客户端上线（同时进行3次握手的客户端数量）sockfd：socket函数返回值文件描述符backlog：上限数值最大为128返回值：成功：0；失败：-1accept()int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);阻塞等待客户端建立连接成功时返回一个与客户端成功连接的socket文件描述符sockfd：最开始建立的socket文件描述符addr：传出参数成功与服务器建立连接的那个客户端的地址结构（IP+port）addrlen：传入传出参数入：addr的大小出：客户端addr的实际大小socklen_t clit_addr_len = sizeof(struct sockaddr)传入参数&clit_addr_len返回值：成功返回新建立的socket的文件描述符非负整数失败：-1connect()int connect(int sockfd, const struct sockaddr *addr,socklen_t addrlen);与服务器建立连接sockfd：socket函数返回值addr：传入参数服务器地址结构addrlen：服务器地址结构长度返回值：成功0失败-1如果不使用bind绑定客户端地址结构系统会隐式绑定一个简单的例子客户端给服务器发一串字符串服务器将接受到字符串转换为大写再发功给客户端这里用的read、write函数和recv、send区别后面再研究//server.c#include#include #include #include #include #include #include #include #define SERVER_PORT 12345void sys_error(const char *str){ perror(str); exit(-1);} int main(int argc, char const *argv[]){ int sfd,cfd,ret=0; socklen_t client_addr_len; char buf[1024]; char client_IP[16]; struct sockaddr_in server_addr,client_addr; server_addr.sin_family = AF_INET; server_addr.sin_port = htons(SERVER_PORT); server_addr.sin_addr.s_addr=htonl(INADDR_ANY); sfd = socket(AF_INET,SOCK_STREAM,0); if(sfd==-1) { sys_error("socket error"); } ret = bind(sfd,(struct sockaddr*)&server_addr,sizeof(server_addr)); if(ret==-1) { sys_error("bind error"); } ret = listen(sfd,128); if(ret==-1) { sys_error("listen error"); } client_addr_len = sizeof(client_addr); cfd = accept(sfd,(struct sockaddr*)&client_addr,&client_addr_len); if(cfd==-1) { sys_error("accept error"); } //打印连接上的客户端IP和端口号 printf("client_ip:%s port:%d\n",inet_ntop(AF_INET,&client_addr.sin_addr.s_addr,client_IP,sizeof(client_IP)),ntohs(client_addr.sin_port) ); while(1) { ret = read(cfd,buf,sizeof(buf)); write(STDOUT_FILENO,buf,ret); for(int i=0;i#include #include #include #include #include #include #include #define SERVER_PORT 12347void sys_error(const char *str){ perror(str); exit(-1);} int main(int argc, char const *argv[]){ int cfd,ret=0; char buf[1024]; struct sockaddr_in client_addr,server_addr; server_addr.sin_family = AF_INET; server_addr.sin_port = htons(SERVER_PORT); //server_addr.sin_addr.s_addr=htonl(INADDR_ANY); inet_pton(AF_INET,"127.0.0.1",&server_addr.sin_addr.s_addr); cfd = socket(AF_INET,SOCK_STREAM,0); if(cfd==-1) { sys_error("socket error"); } ret = connect(cfd,(struct sockaddr*)&server_addr,sizeof(server_addr)); if(ret==-1) { sys_error("connect error"); } while(1) { //scanf("%s",buf); gets(buf);//最好使用fgets write(cfd,buf,strlen(buf)); ret = read(cfd,buf,sizeof(buf)); write(STDOUT_FILENO,buf,ret); printf("\n"); } close(cfd); return 0;}TCP三次握手对应的函数就是acceptconnect
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