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Special Forums IP Networking Getting EAGAIN error while sending
# 1  
Old 10-25-2010
Getting EAGAIN error while sending
Hi Guys

I am using one non blocking socket to send message to the servers.I am using Solaris OS .I am using default buffer size for the socket.The message I am sending roughly size is 20 bytes.I am sending such 18 messages.But I am getting EAGAIN error very occasionally while sending those messages .I observed when I am rebooting the system and send those 18 messages I am getting that EGAIN error .But if Again I am sending those messages afterwards its not giving me any error .Is there any specific reason why its happening after re-boot.

Moreover I want to know when its giving EGAIN its there any way to know how much send buffer is occupied.I dnt have acess to the code of server.So can it be problem of receiving buffer?
# 2  
Old 10-25-2010
You have to delay the send with a timer in a loop, say retry 10 times, then throw a fatal error or just log an error and go on to the next send();
Code:
         struct timespec tsp={0, 200};  // note you may well sleep longer than the interval....
         int rc=0;
         int i=0;
         fprintf(stderr, "%s: OSS port blocking a send\n", now());
         for(i=0; i< 10; i++)
            {
                 nanosleep(&tsp, NULL);
                 if( (rc=send(s, p, len, 0)>0) )
                 {
                          fprintf(stdout, "%s: OSS port send completed\n");
                          break;
                 }
          }

you have to handle the problem in your code;
# 3  
Old 10-25-2010
i think it's not related buffer size..this is probably read (like uncompleted read) on socket problem for some reasons (slow network or high load )..
for this in your code you can set timeout (probably already ) or increase a bit

Code:
 ..........
 
struct timeval {
        int wait_time.tv_sec;   
        int wait_time.tv_usec; 
    }; 
............
 
wait_time.tv_sec  = 30; /* "wait_time.tv_sec  = 1 * 60; " change try to one minute  */
wait_time.tv_usec = 0;
.....
 
select(max_descriptor+1, &read_flags,&write_flags,(fd_set*)0,&wait_time);
......

This User Gave Thanks to ygemici For This Post:
mr_deb
# 4  
Old 10-26-2010
Thanks for your response
Is there any way to identify how much buffer is available for the socket ?
# 5  
Old 10-26-2010
hi

firstly did you try @jim mcnamara and my advices and what is happen?

secondly i m not sure but probably check buff size like below if is already predefined
Code:
getconf -a |grep SOCK_MAXBUF

and set and get send/rec buff size
maybe try like below

for setsocketpacket
Code:
 
#include <sys/types.h>
#include <sys/socket.h> 
..........
..........
int newMaxBuffset = 8192;
int err = setsockopt(socketfd, SOL_SOCKET, SO_SNDBUF, (char *)&newMaxBuffset, (int)sizeof(newMaxBuffset));

or
Code:
int err = setsockopt(socketfd, SOL_SOCKET, SO_RCVBUF, (char *)&newMaxBuffset, (int)sizeof(newMaxBuffset));

and for getsocketpacket
Code:
int type, size;
size = sizeof(int);
if(getsockopt(socketfd, SOL_SOCKET, SO_SNDBUF, (char*)&type,&size)<0){
...
....
}
 
if(getsockopt(socketfd, SOL_SOCKET, SO_RCVBUF, (char*)&type,&size)<0){
....
.....
}

# 6  
Old 10-27-2010
Thanks for your Reply.I am getting max buffer size for sending as 65525.Which is not so less I guess.

We are sending 12 messages of size 20Bytes .And we are doing it localserver only.



---------- Post updated 10-27-10 at 01:49 AM ---------- Previous update was 10-26-10 at 05:32 AM ----------




Hi
I am trying use flush(socket) to clean up the buffer.But flush is blocking the blow .its stuck there only.Any reason that flush is not supported in Non blocking call .Please Clarify
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