The rte_pcapng_write_packets() function fails when we try to write more
packets than the IOV_MAX limit. writev() system call is limited by the
IOV_MAX limit. The iovcnt argument is valid if it is greater than 0 and
less than or equal to IOV_MAX as defined in <limits.h>.
To avoid this problem, we can check that all segments of the next
packet will fit into the iovec buffer, whose capacity will be limited
by the IOV_MAX limit. If not, we flush the current iovec buffer to the
file by calling writev() and, if successful, fit the current packet at
the beginning of the flushed iovec buffer.
Fixes: 8d23ce8f5ee9 ("pcapng: add new library for writing pcapng files")
Cc: stable@dpdk.org
Signed-off-by: Mário Kuka <kuka@cesnet.cz>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
0744f1c9f9