linux中的socket阻塞问题

[nanyun2010]

在网上找了一个ftp的客户端，长时间去文件列表，发生阻塞，有时提示这个错误read: Connection reset by peer
Control socket read failed: Invalid argument。请大家帮忙解决一下，急用。谢谢了。

[nanyun2010]

int ftplib::FtpXfer(const char *localfile, const char *path, ftphandle *nControl, accesstype type, transfermode mode)
{
int l,c;
char *dbuf;
FILE *local = NULL;
ftphandle *nData;
int rv=1; // 3.1-1

if (localfile != NULL)
{
//printf("localfile: -%s-\n", localfile);

//local = fopen(localfile, (typ == ftplib::filewrite) ? "r" : "w");
char ac[3] = " ";
if ((type == ftplib::dir) || (type == ftplib::dirverbose)) { ac[0] = 'w'; ac[1] = '\0'; }
if (type == ftplib::fileread) { ac[0] = 'w'; ac[1] = '\0'; }
if (type == ftplib::filewriteappend) { ac[0] = 'r'; ac[1] = '\0'; }
if (type == ftplib::filereadappend) { ac[0] = 'a'; ac[1] = '\0'; }
if (type == ftplib::filewrite) { ac[0] = 'r'; ac[1] = '\0'; }
if (mode == ftplib::image) ac[1] = 'b';

#ifndef NOLFS
local = fopen64(localfile, ac);
if (type == ftplib::filewriteappend) fseeko64(local,mp_ftphandle->offset,SEEK_SET);
#else
local = fopen(localfile, ac);
if (type == ftplib::filewriteappend) fseek(local,mp_ftphandle->offset,SEEK_SET);
#endif
if (local == NULL)
{
strncpy(nControl->response, strerror(errno), sizeof(nControl->response));
return 0;
}
}
if (local == NULL) local = ((type == ftplib::filewrite)
|| (type == ftplib::filewriteappend)) ? stdin : stdout;
if (!FtpAccess(path, type, mode, nControl, &nData))
{
if (localfile != NULL)
fclose(local);
return 0;
}

dbuf = static_cast<char*>(malloc(FTPLIB_BUFSIZ));
if ((type == ftplib::filewrite) || (type == ftplib::filewriteappend))
{
while ((l = fread(dbuf, 1, FTPLIB_BUFSIZ, local)) > 0)
{
if ((c = FtpWrite(dbuf, l, nData)) < l)
{
printf("short write: passed %d, wrote %d\n", l, c);
rv = 0;
break;
}
}
}
else
{
while ((l = FtpRead(dbuf, FTPLIB_BUFSIZ, nData)) > 0)
{
if (fwrite(dbuf, 1, l, local) <= 0)
{
perror("localfile write");
break;
}
}
}
free(dbuf);
fflush(local);
if (localfile != NULL)
fclose(local);
return FtpClose(nData);
return rv;
}

[龙行天下之Sky]

顶一下，有空再看

[nanyun2010]

求答案，谢谢了。

[nanyun2010]

是read（）的阻塞问题，不知道怎么解决，因为是别人写的函数不想做大的改动，有没有什么简单易行的方法，请各位大虾指教。

[ly1213]

我也遇到了同样的问题！

[ly1213]

不过我刚解决了 他在拿没有的文件时的处理有问题 未释放句柄 你看下吧

[movie0125]

你的socket创建是用的阻塞还是非阻塞（默认是阻塞）

[nanyun2010]

在连接的时候加上

    if(setsockopt(sControl,SOL_SOCKET,SO_SNDTIMEO,&timeout,sizeof(timeout))== -1)
    {
		perror("setsockopt SO_SNDTIMEO");
		net_close(sControl);
		return 0;
    }

    if(setsockopt(sControl,SOL_SOCKET,SO_RCVTIMEO,&timeout,sizeof(timeout))==-1)
    {
		perror("setsockopt SO_RCVTIMEO");
		net_close(sControl);
		return 0;
    }

出现如下错误，且程序退出。
read: Resource temporarily unavailable
Control socket read failed: Invalid argument
read: Resource temporarily unavailable
Control socket read failed: Resource temporarily unavailable
read: Resource temporarily unavailable
Control socket read failed: Resource temporarily unavailable
read: Resource temporarily unavailable
.
.
.
.
.
Control socket read failed: Resource temporarily unavailable
read: Resource temporarily unavailable
Control socket read failed: Resource temporarily unavailable
read: Resource temporarily unavailable
Control socket read failed: Resource temporarily unavailable
read: Resource temporarily unavailable
Control socket read failed: Resource temporarily unavailable
write: Resource temporarily unavailable
write: Resource temporarily unavailable
write: Resource temporarily unavailable
write: Resource temporarily unavailable
write: Resource temporarily unavailable
write: Resource temporarily unavailable
.
.
.
.
write: Resource temporarily unavailable
write: Resource temporarily unavailable
write: Connection timed out

[nanyun2010]

[Quote=引用 7 楼 ly1213 的回复:]
不过我刚解决了 他在拿没有的文件时的处理有问题 未释放句柄 你看下吧
[/Quote]
能具体说一下吗？谢谢了。

[nanyun2010]

我想提示连接超时，程序能继续运行。怎么处理这种错误啊？