poll( ) and brk( ) system calls

[achit]

Hi,

I'm new to network programming on Sun/Solaris. My program is trying to send data to a network by writing the data onto a local socket.

It works fine unless there's a network congestion. When the program cannot send the data out, it requests memory aggressively. And that lead to the large memory growth in my program.

I've used truss to see what happened and below is the snippet.

20.9966 send(7, " c h a n H o s t\0\n04\n".., 32768, 0) Err#11 EAGAIN
21.0509 poll(0xFFBEF270, 6, 49) = 0
21.0512 time() = 1079741694
21.0517 write(6, "\n tek : 0 3 / 1 9 /".., 47) = 47
21.0533 brk(0x05FCE250) = 0
21.0535 brk(0x05FD0250) = 0
21.0539 write(6, " M e s s a g e a n".., 68) = 68
21.0554 brk(0x05FD0250) = 0
21.0556 brk(0x05FD4250) = 0

In my code, only the send function is called. I have no idea where poll and brk come from. Why are they called despite of not being in the code?

Can anyone help me on this? I'd appreciate all answers.
Thanks a lot.