topic socket recive program in Operating System - HP-UX

socket recive program

alert0952 — Tue, 09 Jun 2015 08:11:34 GMT

I wrote a program but i always run 4 hours and keep loop

program is still alive but the program do nothing,

does any one know how to solve this problem

below is gdb information and source code

int
CHpuxSocket::readn(int fd, char *buf, unsigned int len)
{
//printf("INFO: HpuxSocket::readn\n");
int cnt;
int rc;
cnt = len;
int counter = 0;
try
{
while (cnt > 0)
{
rc = recv(fd,buf,cnt,0);
//printf("rc=%d\n",rc);
if (rc < 0)
{
if (counter >= 3)
{
return -1;
}
if (errno == EAGAIN)
{
counter++;
continue;
}
else
return -1;
}
if (rc == 0)
return len-cnt;
buf += rc;
cnt -= rc;
}
return len;
}
catch (...)
{
printf("ERROR: Exception happen\n");
return len;
}
}

Attaching to program: /usr/local/sbin/ISAgent/isAgent, process 1766

0x60000000c040b3f0:0 in _recv_sys+0x30 () from /usr/lib/hpux32/libc.so.1

(gdb) bt

#0 0x60000000c040b3f0:0 in _recv_sys+0x30 () from /usr/lib/hpux32/libc.so.1

#1 0x60000000c0420dc0:0 in recv+0x80 () from /usr/lib/hpux32/libc.so.1

warning:

ERROR: Use the "objectdir" command to specify the search path for objectfile CHpuxSocket.o.

If NOT specified will behave as a non -g compiled binary.

#2 0x431c190:0 in CHpuxSocket::readn(int,char*,unsigned int)+0xc0 ()

#3 0x431b1f0:0 in CHpuxSocket::GetSessionKey(char*,char*)+0x5b0 ()

warning:

ERROR: Use the "objectdir" command to specify the search path for objectfile irmassock.o.

If NOT specified will behave as a non -g compiled binary.

#4 0x40b4410:0 in irmassock::bAuthenticate()+0x70 ()

warning:

ERROR: Use the "objectdir" command to specify the search path for objectfile irmas.o.

If NOT specified will behave as a non -g compiled binary.

#5 0x40a92c0:0 in irmas::bConnectToServer(char*,int)+0x180 ()

#6 0x409e3a0:0 in irmas::bConnectToServer(int)+0x40 ()

#7 0x40a03c0:0 in irmas::Routine(int)+0x110 ()

warning:

ERROR: Use the "objectdir" command to specify the search path for objectfile irmas_main.o.

If NOT specified will behave as a non -g compiled binary.

#8 0x409afb0:0 in main+0xa90 ()

(gdb)

Re: socket receive program

Dennis Handly — Mon, 15 Jun 2015 17:08:27 GMT

>try/catch

This is useless if you are just calling libc routines. They don't throw C++ exceptions.

#1 0x60000000c0420dc0:0 in recv+0x80 /usr/lib/hpux32/libc.so.1

#2 0x431c190:0 in CHpuxSocket::readn(int,char*,unsigned int)+0xc0

The stacktrace just shows you waiting on a socket read.

(It also would help if you followed a consistent indentation policy.)

Re: socket receive program

alert0952 — Wed, 23 Mar 2016 05:25:40 GMT

Sorry I donot know how to solve this problem with

my problem is hang with recv() os library

(gdb) where
#0 0x60000000c037d010:0 in _recv_sys+0x30 () from /usr/lib/hpux32/libc.so.1
#1 0x60000000c03909b0:0 in recv+0x170 () from /usr/lib/hpux32/libc.so.1
#2 0x43154c0:0 in CHpuxSocket::readn () at hpux/CHpuxSocket.cpp:271
#3 0x43147b0:0 in CHpuxSocket::GetSessionKey () at hpux/CHpuxSocket.cpp:357
#4 0x40b1490:0 in irmassock::bAuthenticate () at irmassock.cpp:223
#5 0x40a6630:0 in irmas::bConnectToServer () at irmas.cpp:424
#6 0x409c730:0 in irmas::bConnectToServer () at irmas.cpp:402
#7 0x409e590:0 in irmas::Routine () at irmas.cpp:1209
#8 0x40994f0:0 in main () at irmas_main.cpp:344

below is my source code ,how to solve it

Re: socket receive program

Dennis Handly — Sat, 26 Mar 2016 07:48:30 GMT

>my problem is hang with recv(2)

This will hang unless you are in non-blocking mode.

(As I mentioned 9 months ago, remove the try/catch as useless on HP-UX.)