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  用valgrind检查程序中的内存泄露情况问题？ - pingzhenyu [ 2006-08-21 13:19 | 2,886 byte(s)]
Re: 用valgrind检查程序中的内存泄露情况问题？ - pingzhenyu [ 2006-08-21 21:54 | 82 byte(s)]
Re: 用valgrind检查程序中的内存泄露情况问题？ - lennonping [ 2006-09-08 23:07 | 112 byte(s)]
Re: 用valgrind检查程序中的内存泄露情况问题？ - pingzhenyu [ 2006-08-21 14:47 | 1,869 byte(s)]
Re: 用valgrind检查程序中的内存泄露情况问题？ - pingzhenyu [ 2006-08-21 14:23 | 1,194 byte(s)]
Re: 用valgrind检查程序中的内存泄露情况问题？ - pingzhenyu [ 2006-08-21 14:10 | 570 byte(s)]
Re: 用valgrind检查程序中的内存泄露情况问题？ - drangon_zhou [ 2006-08-21 13:54 | 254 byte(s)]
Re: 用valgrind检查程序中的内存泄露情况问题？ - pingzhenyu [ 2006-08-21 13:53 | 420 byte(s)]
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我想用valgrind检查程序中的内存泄露情况，可是我程序都没有办法正常运行了！
我用的是异步的socket,为什么socket会收到乱的东西啊?
不用valgrind启动程序时都是正常的。
1、TCP接收数据时，RD_ISSET一直为true，ER_ISSET为true 数据是0。
2、UDP接收数据时，RD_ISSET一直为true，数据长度不为0，但接收到的数据都是0。
系统：
Linux headend1 2.6.8-24-default #1 Wed Oct 6 09:16:23 UTC 2004 i686 i686 i386 GNU/Linux
headend1:/home/he # gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ./configure
Thread model: posix
gcc version 4.1.0
代码如下：
if (fd > 0 && FD_ISSET(fd,&rd))
{
LOGGER_DEBUG(loggerP, "RD_ISSET");
//have data can be read from fd
if(fd == emsFd)
{
int len = read(fd, cmdBufP->rBuf + cmdBufP->rBufLen,
CMD_RD_BUF_MAX_LEN - cmdBufP->rBufLen);
if (fd > 0 && FD_ISSET(fd,&er))
{
LOGGER_DEBUG(loggerP, "ER_ISSET");
//have error for specified fd
char c;
errno = 0;
int r = recv(fd, &c, 1, MSG_OOB);
if ( r < 1 )
{
//clear error fd_set
FD_CLR(fd,&er);
//have really error
LOGGER_DEBUG(loggerP,"connect to client fd occured problem");
shutdownFd(fd);
return;
}
else
{
//may be have MSG_OOB
LOGGER_DEBUG(loggerP,"received MSG_OOB");
}
运行日志如下：
2:40 [CmdTrsvr] RD_ISSET
2:40 [CmdTrsvr] not received one error frame00000
[CmdTrsvr] buffer data:
00 00 00
2:40 [CmdTrsvr] ER_ISSET
2:40 [CmdTrsvr] received MSG_OOB
2:40 [UdpTrsvr] snmp data get:
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00
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检查select()、read()、recv()等函数的返回值，valgrind可能会打断用户系统调用，
从而使这些系统调用返回-1，errno可能是EINTR等值。
就算不用valgrind，这种情况也是会出现的，只不过概率低很多，但只要会出现的情况，
程序中都需要考虑处理。
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----
岂有豪情似旧时，花开花落两由之。
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我当然检查了
问题是一直不断的出现这个无效的数据。程序根本无法正常运行。
肯定不是需要检查错误的问题。
问题是为什么会出现这个错误，如何避免。
len = read(fd, cmdBufP->rBuf + cmdBufP->rBufLen,
CMD_RD_BUF_MAX_LEN - cmdBufP->rBufLen);
if ( len> 0)
{
}
else
{
LOGGER_ERROR(loggerP, "tcp recv data is error !");
shutdownFd(fd);
}
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socket监听：
if ( ( s = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
{
//perror("socket");
LOGGER_ERROR(loggerP,"socket failed");
return -1;
}
yes = -1;
if ( setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&yes, sizeof(yes)) < 0 )
{
//perror("setsockopt");
LOGGER_ERROR(loggerP,"setsockopt failed");
close(s);
return -1;
}
memset(&a, 0, sizeof(a));
a.sin_port = htons(listenPort);
a.sin_family = AF_INET;
if ( bind(s, (struct sockaddr *)&a, sizeof(a)) < 0 )
{
//perror("bind");
LOGGER_ERROR(loggerP,"bind failed");
close(s);
return -1;
}
char buf[1024];
sprintf(buf,"accepting connections on port %d", listenPort);
LOGGER_INFO(loggerP,buf);
listen(s, 10);
return s;
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dTrsvr] buffer data:
--4143-- sigvgkill for lwp 4143 tid 1
00 00 00
--4143-- sigvgkill for lwp 4143 tid 1
00 00 00
--4143-- sigvgkill for lwp 4143 tid 1
--4143-- sigvgkill for lwp 4143 tid 1
--4143-- sigvgkill for lwp 4143 tid 1
dTrsvr] ER_ISSET
--4143-- sigvgkill for lwp 4143 tid 1
vr] ER_ISSET
--4143-- sigvgkill for lwp 4143 tid 1
--4143-- sigvgkill for lwp 4143 tid 1
--4143-- sigvgkill for lwp 4143 tid 1
[CmdTrsvr] received MSG_OOB
++4143++ do_setmask: tid = 1 how = 2 (SIG_SETMASK), set = 0xBEFFF39C 0000000000000000
++4143++ oldset=0xBEFFF29C 8000000000000000
--4143-- poll_signals: got signal 64 for thread 1
--4143-- Polling found signal 64 for tid 1
--4143-- signal 64 ignored
--4143-- sigvgkill for lwp 4143 tid 1
--4143-- poll_signals: got signal 64 for thread 1
--4143-- Polling found signal 64 for tid 1
--4143-- signal 64 ignored
++4143++ do_setmask: tid = 1 how = 2 (SIG_SETMASK), set = 0xBEFFF29C 8000000000000000
--4143-- sigvgkill for lwp 4143 tid 1
--4143-- sigvgkill for lwp 4143 tid 1
--4143-- sigvgkill for lwp 4143 tid 1
6:57 [UdpTrsvr] snmp data get:
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 -- 00 00 00 00 00 00 00 00
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