I have a question about codes in file snmp_api.c
int
snmp_sess_select_info(void *sessp,
int *numfds,
fd_set * fdset, struct timeval *timeout, int *block)
{
int rc;
netsnmp_large_fd_set lfdset;
netsnmp_large_fd_set_init(&lfdset, FD_SETSIZE);
netsnmp_copy_fd_set_to_large_fd_set(&lfdset, fdset);
rc = snmp_sess_select_info2(sessp, numfds, &lfdset, timeout, block);
if (netsnmp_copy_large_fd_set_to_fd_set(fdset, &lfdset) < 0) {
snmp_log(LOG_ERR,
"Use snmp_sess_select_info2() for processing"
" large file descriptors");
}
netsnmp_large_fd_set_cleanup(&lfdset);
return rc;
}
after call snmp_sess_select_info2 , all infomation is in lfdset, Next they call
netsnmp_copy_large_fd_set_to_fd_set?
in function :
int
netsnmp_copy_large_fd_set_to_fd_set(fd_set * dst,
const netsnmp_large_fd_set * src)
{
/* Report failure if *src is larger than FD_SETSIZE. */
if (src->lfs_setsize > FD_SETSIZE) {
FD_ZERO(dst);
return -1;
}
... ...
because src->lfs_setsize has been resized in the previous (see function
snmp_sess_select_info2,
call NETSNMP_LARGE_FD_SET(slp->transport->sock, fdset); ), it must be greater
than FD_SETSIZE,
function netsnmp_copy_large_fd_set_to_fd_set always returns -1 in large file
descriptor.
Is there a bug?
Thanks!!
2010-06-22
s00110979
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