select(2)
----- Original Message -----
From: "Brad Bonkoski" <[email protected]>
To: <[email protected]>
Sent: Friday, August 03, 2001 10:15 AM
Subject: select(2)
Quoted 14 lines
Hello,
this code:
fd_setset;
struct timeval timeout;
intlen_inet;
int n;FD_ZERO(&set);
timeout.tv_sec = 1L;FD_SET(sc_sock,&set);
n =select(sc_sock+1, &set, NULL, NULL, &timeout); if (n == -1)
Quoted 5 lines
perror("select()\n");
exit(1);
}Works just fine on one machine, i.e.
select()does not return a '-1' which
lets it run through the rest of the code. However, on other machines, it does not work fine, -1 is always returned by select() with error of: Invalid arguement
Quoted 2 lines
Any ideas on where I could look to fix this problem? Something in the
syntax of the posted code, or should I be looking at the creation of the socket?
Quoted 7 lines
TIA.
Brad
Quoted 9 lines · Brad Bonkoski
Quoted 9 lines
Hello,
this code:
fd_setset;
struct timeval timeout;
intlen_inet;
int n;FD_ZERO(&set);
timeout.tv_sec = 1L;
I would venture a guess that as you don't EXPLICITELY
initialize the timeout.tv_usec value to be
within 0 to 999999 it may get some system dependent
sometimes random, sometimes fixed value (the joys of these stack-allocated "automatic" variables..)
For short: Smells of UNINITIALIZED PARAMETER DATA.
Quoted 32 lines
Quoted 10 lines
FD_SET(sc_sock,&set);
n =select(sc_sock+1, &set, NULL, NULL, &timeout); if (n == -1)perror("select()\n");
exit(1);
}Works just fine on one machine, i.e.
select()does not return a '-1' whichlets it run through the rest of the code. However, on other machines, it does not work fine, -1 is always returned by
select()with error of: Invalid arguementQuoted 2 lines
Any ideas on where I could look to fix this problem? Something in the
syntax of the posted code, or should I be looking at the creation of the socket?
Quoted 7 lines
TIA.
Brad-
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