Question

sock = socket(AF_INET, SOCK_STREAM, 0);报错，是不是少什么lib?

sock = socket(AF_INET, SOCK_STREAM, 0);

sin.sin_family = AF_INET;
sin.sin_port = htons(22);
sin.sin_addr.s_addr = hostaddr;
if (connect(sock, (struct sockaddr*)(&sin),
sizeof(struct sockaddr_in)) != 0) {
fprintf(stderr, "failed to connect!\n");
return -1;
}

ssh2.c: In function ‘main’:
ssh2.c:83:24: error: storage size of ‘sin’ isn’t known
ssh2.c:126:19: error: ‘AF_INET’ undeclared (first use in this function)
ssh2.c:126:19: note: each undeclared identifier is reported only once for each function it appears in
ssh2.c:126:28: error: ‘SOCK_STREAM’ undeclared (first use in this function)
ssh2.c:132:24: error: invalid application of ‘sizeof’ to incomplete type ‘struct sockaddr_in’
#include "libssh2_config.h"
#include <libssh2.h>

#ifdef HAVE_WINSOCK2_H
# include <winsock2.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
# ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif

#include <sys/time.h>
#include <sys/types.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>

这个是头

我在linux gcc编译报错的
代码都是从官网上拷贝的
我觉得还是少什么lib

Answer 1

预编译 这里有#ifdef HAVE_SYS_SOCKET_H

所以需要 #define HAVE_SYS_SOCKET_H
不然编译的时候不会载入 sys/socket.h

Answer 2

头文件有木有少？
#include <winsock2.h>
#include <ws2tcpip.h>
#pragma comment(lib,"Ws2_32.lib")