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Extend select backend for sockets to work with a poll interface (more

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detail is passed back and forwards).  This mostly came from NetBSD, except
that our interfaces have changed a lot and this funciton is in a different
part of the kernel.

Obtained from: NetBSD
This commit is contained in:
Peter Wemm 1997-09-14 02:34:14 +00:00
parent 42d1175732
commit e25aa68e0c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=29352
1 changed files with 25 additions and 27 deletions
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52
sys/kern/uipc_socket.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
* $Id: uipc_socket.c,v 1.29 1997/08/21 20:33:39 bde Exp $
* $Id: uipc_socket.c,v 1.30 1997/09/02 20:05:57 bde Exp $
*/
#include <sys/param.h>
@ -42,6 +42,7 @@
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/kernel.h>
#include <sys/poll.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
@ -1085,38 +1086,35 @@ sohasoutofband(so)
}
int
soselect(struct socket *so, int which, struct proc *p)
sopoll(struct socket *so, int events, struct ucred *cred, struct proc *p)
{
int revents = 0;
int s = splnet();
switch (which) {
case FREAD:
if (soreadable(so)) {
splx(s);
return (1);
}
selrecord(p, &so->so_rcv.sb_sel);
so->so_rcv.sb_flags |= SB_SEL;
break;
if (events & (POLLIN | POLLRDNORM))
if (soreadable(so))
revents |= events & (POLLIN | POLLRDNORM);
case FWRITE:
if (sowriteable(so)) {
splx(s);
return (1);
}
selrecord(p, &so->so_snd.sb_sel);
so->so_snd.sb_flags |= SB_SEL;
break;
if (events & (POLLOUT | POLLWRNORM))
if (sowriteable(so))
revents |= events & (POLLOUT | POLLWRNORM);
case 0:
if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) {
splx(s);
return (1);
if (events & (POLLPRI | POLLRDBAND))
if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
revents |= events & (POLLPRI | POLLRDBAND);
if (revents == 0) {
if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
selrecord(p, &so->so_rcv.sb_sel);
so->so_rcv.sb_flags |= SB_SEL;
}
if (events & (POLLOUT | POLLWRNORM)) {
selrecord(p, &so->so_snd.sb_sel);
so->so_snd.sb_flags |= SB_SEL;
}
selrecord(p, &so->so_rcv.sb_sel);
so->so_rcv.sb_flags |= SB_SEL;
break;
}
splx(s);
return (0);
return (revents);
}