ioctl(ptSocket->m_hSocket, FIONREAD, &nLength)
ptSocket->m_hSocket 为
socket（）
bind（）
listen（）
我自己测试了一下把listen（）注释掉ioctl是不返回错误的 ，难道listen之后socketfd的属性发生变化了？
我自己写了个demo，写的随便了一下
注释掉listen（） 那一行就没问题#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/un.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <malloc.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <stdarg.h>
#include <fcntl.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
int main ()
{
int socketfd;
int nRet = -1;
int len;
int nOn;
int nYes;
int nkeepIdle = 5;
int nkeepInterval = 5;
int nkeepCount = 3;
struct sockaddr_in addr;
socketfd = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
setsockopt(socketfd, IPPROTO_TCP, TCP_NODELAY, (char*)&nOn, sizeof(int));
setsockopt(socketfd, SOL_SOCKET, SO_KEEPALIVE, (char*)&nYes, sizeof(int));
nRet = setsockopt(socketfd, SOL_TCP, TCP_KEEPIDLE, (void *)&nkeepIdle, sizeof(nkeepIdle));
nRet = setsockopt(socketfd, SOL_TCP, TCP_KEEPINTVL, (void *)&nkeepInterval, sizeof(nkeepInterval));
nRet = setsockopt(socketfd, SOL_TCP, TCP_KEEPCNT, (void *)&nkeepCount, sizeof(nkeepCount));
addr.sin_family = AF_INET;
addr.sin_port = htons(8000);
addr.sin_addr.s_addr = INADDR_ANY;
bind(socketfd, (struct sockaddr*)&addr, sizeof(addr));
listen(socketfd, 2);
nRet = ioctl(socketfd, FIONREAD, &len);
printf("the ret = %d, socket = %d, error = %d\n", nRet, socketfd, errno);
return 0;
}
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有大神帮忙看看 ioctl 和 listen 的源码 帮忙分析具体的原因
