static int pcap_mmap_prepare_reading_pcap(int fd)
{
int ret;
struct stat sb;
set_ioprio_be();
spinlock_lock(&lock);
ret = fstat(fd, &sb);
if (ret < 0)
panic("Cannot fstat pcap file!\n");
if (!S_ISREG (sb.st_mode))
panic("pcap dump file is not a regular file!\n");
map_size = sb.st_size;
pstart = mmap(0, map_size, PROT_READ, MAP_SHARED | MAP_LOCKED
/*| MAP_HUGETLB*/, fd, 0);
if (pstart == MAP_FAILED)
panic("mmap of file failed!");
ret = madvise(pstart, map_size, MADV_SEQUENTIAL);
if (ret < 0)
panic("Failed to give kernel mmap advise!\n");
pcurr = pstart + sizeof(struct pcap_filehdr);
spinlock_unlock(&lock);
return 0;
}
static int pcap_mmap_prepare_writing_pcap(int fd)
{
int ret;
off_t pos;
struct stat sb;
set_ioprio_be();
spinlock_lock(&lock);
map_size = get_map_size();
ret = fstat(fd, &sb);
if (ret < 0)
panic("Cannot fstat pcap file!\n");
if (!S_ISREG (sb.st_mode))
panic("pcap dump file is not a regular file!\n");
pos = lseek(fd, map_size, SEEK_SET);
if (pos < 0)
panic("Cannot lseek pcap file!\n");
ret = write_or_die(fd, "", 1);
if (ret != 1)
panic("Cannot write file!\n");
pstart = mmap(0, map_size, PROT_WRITE, MAP_SHARED
/*| MAP_HUGETLB*/, fd, 0);
if (pstart == MAP_FAILED)
panic("mmap of file failed!");
ret = madvise(pstart, map_size, MADV_SEQUENTIAL);
if (ret < 0)
panic("Failed to give kernel mmap advise!\n");
pcurr = pstart + sizeof(struct pcap_filehdr);
spinlock_unlock(&lock);
return 0;
}
static void pcap_mm_init_once(bool enforce_prio)
{
if (enforce_prio)
set_ioprio_be();
}
