our $epoll_wait_events;
our $epoll_wait_size = 0;
sub epoll_wait_mod4 {
- # resize our static buffer if requested size is bigger than we've ever done
- if ($_[1] > $epoll_wait_size) {
- $epoll_wait_size = $_[1];
- $epoll_wait_events = "\0" x 12 x $epoll_wait_size;
- }
- my $ct = syscall($SYS_epoll_wait, $_[0]+0, $epoll_wait_events, $_[1]+0, $_[2]+0);
- for (0..$ct-1) {
- @{$_[3]->[$_]}[1,0] = unpack("LL", substr($epoll_wait_events, 12*$_, 8));
- }
- return $ct;
+ my ($epfd, $maxevents, $timeout_msec, $events) = @_;
+ # resize our static buffer if maxevents bigger than we've ever done
+ if ($maxevents > $epoll_wait_size) {
+ $epoll_wait_size = $maxevents;
+ vec($epoll_wait_events, $maxevents * 12 * 8 - 1, 1) = 0;
+ }
+ @$events = ();
+ my $ct = syscall($SYS_epoll_wait, $epfd, $epoll_wait_events,
+ $maxevents, $timeout_msec);
+ for (0..$ct - 1) {
+ # 12-byte struct epoll_event
+ # 4 bytes uint32_t events mask (skipped, useless to us)
+ # 8 bytes: epoll_data_t union (first 4 bytes are the fd)
+ # So we skip the first 4 bytes and take the middle 4:
+ $events->[$_] = unpack('L', substr($epoll_wait_events,
+ 12 * $_ + 4, 4));
+ }
}
sub epoll_wait_mod8 {
- # resize our static buffer if requested size is bigger than we've ever done
- if ($_[1] > $epoll_wait_size) {
- $epoll_wait_size = $_[1];
- $epoll_wait_events = "\0" x 16 x $epoll_wait_size;
- }
- my $ct;
- if ($no_deprecated) {
- $ct = syscall($SYS_epoll_wait, $_[0]+0, $epoll_wait_events, $_[1]+0, $_[2]+0, undef);
- } else {
- $ct = syscall($SYS_epoll_wait, $_[0]+0, $epoll_wait_events, $_[1]+0, $_[2]+0);
- }
- for (0..$ct-1) {
- # 16 byte epoll_event structs, with format:
- # 4 byte mask [idx 1]
- # 4 byte padding (we put it into idx 2, useless)
- # 8 byte data (first 4 bytes are fd, into idx 0)
- @{$_[3]->[$_]}[1,2,0] = unpack("LLL", substr($epoll_wait_events, 16*$_, 12));
- }
- return $ct;
+ my ($epfd, $maxevents, $timeout_msec, $events) = @_;
+
+ # resize our static buffer if maxevents bigger than we've ever done
+ if ($maxevents > $epoll_wait_size) {
+ $epoll_wait_size = $maxevents;
+ vec($epoll_wait_events, $maxevents * 16 * 8 - 1, 1) = 0;
+ }
+ @$events = ();
+ my $ct = syscall($SYS_epoll_wait, $epfd, $epoll_wait_events,
+ $maxevents, $timeout_msec,
+ $no_deprecated ? undef : ());
+ for (0..$ct - 1) {
+ # 16-byte struct epoll_event
+ # 4 bytes uint32_t events mask (skipped, useless to us)
+ # 4 bytes padding (skipped, useless)
+ # 8 bytes epoll_data_t union (first 4 bytes are the fd)
+ # So skip the first 8 bytes, take 4, and ignore the last 4:
+ $events->[$_] = unpack('L', substr($epoll_wait_events,
+ 16 * $_ + 8, 4));
+ }
}
sub signalfd ($$$) {