我用C语言写了一个非常小的函数,它打开一个套接字,接受连接并立即关闭它们。问题是,每个连接都会占用一些内存,并且在任何时候都不释放它,使进程的内存不断增长(最后几百兆字节)。我知道进程并不总是将它的空闲内存返回给操作系统。但是一旦它超过几兆字节,我认为它应该返回内存,难道我错了吗?这种情况只发生在Windows上,在Linux上我的内存使用率始终接近进程启动时的使用率。使用GCC 4.8.2编译,在Windows Server 2008 R2和Windows 8.1上测试。
void http_server_start(void) {
int rc;
struct sockaddr_in cfg;
#ifdef _WIN32
WORD ver;
WSADATA data;
ver=MAKEWORD(2,2);
rc=WSAStartup(ver, &data);
if(rc != 0){
printf("Error: Unable to initialize WSA (%d)", rc);
}
#endif
memset(&cfg, 0, sizeof(cfg));
cfg.sin_family = AF_INET;
cfg.sin_addr.s_addr = htonl(INADDR_ANY);
cfg.sin_port = htons(PORT);
server = socket(AF_INET, SOCK_STREAM, 6);
int reuseaddr=1;
if (setsockopt(server, SOL_SOCKET, SO_REUSEADDR, (char*)&reuseaddr, sizeof(reuseaddr)) == -1){
rc=GetLastErrorEx();
printf("Error: Unable to set SO_REUSEADDR (%d)\n", rc);
} else if (bind(server, (struct sockaddr *)&cfg, sizeof(cfg)) < 0 ) {
rc=GetLastErrorEx();
printf("Error: Unable to bind socket (%d)\n", rc);
close(server);
} else if (listen(server, QUEUE_SIZE) < 0) {
rc=GetLastErrorEx();
printf("Error: Unable to listen (%d)\n", rc);
close(server);
} else {
printf("Listening on %s:%d\n", inet_ntoa(cfg.sin_addr), ntohs(cfg.sin_port));
int client;
struct sockaddr_in addr;
int addrlen=sizeof(addr);
do {
client=accept(server, (struct sockaddr*)&addr, &addrlen);
if(client != -1){
shutdown(client, SHUT_RDWR);
close(client);
}
} while(1);
}
}
closesocket
иҖҢдёҚжҳҜclose
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