1 // vim: noet sw=4 ts=4:
3 ==================================================================================
4 Copyright (c) 2020 Nokia
5 Copyright (c) 2020 AT&T Intellectual Property.
7 Licensed under the Apache License, Version 2.0 (the "License");
8 you may not use this file except in compliance with the License.
9 You may obtain a copy of the License at
11 http://www.apache.org/licenses/LICENSE-2.0
13 Unless required by applicable law or agreed to in writing, software
14 distributed under the License is distributed on an "AS IS" BASIS,
15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 See the License for the specific language governing permissions and
17 limitations under the License.
18 ==================================================================================
22 **************************************************************************
24 * Abstract: This routine will poll the sockets that are open for
25 * an event and return after the delay period has expired, or
26 * an event has been processed.
27 * Parms: gptr - Pointer to the global information block
28 * msdelay- 100ths of seconds to delay
29 * Returns: SI_OK if the caller can continue, SI_ERROR if all sessions have been
30 * stopped, or the interface cannot proceed. When SI_ERROR is
31 * returned the caller should cleanup and exit immediatly (we
32 * have probably received a sigter or sigquit.
34 * Author: E. Scott Daniels
36 **************************************************************************
38 #include "sisetup.h" // get the setup stuff
39 #include "sitransport.h"
43 extern int SIpoll( struct ginfo_blk *gptr, int msdelay )
45 //extern int deaths; // number of children that died and are zombies
46 //extern int sigflags; // flags set by the signal handler routine
48 int fd; // file descriptor for use in this routine
49 int ((*cbptr)()); // pointer to callback routine to call
50 int status = SI_OK; // return status
51 int addrlen; // length of address from recvfrom call
52 char *buf; // work buffer pointer
55 struct tp_blk *tpptr; // pointer at tp stuff
56 struct tp_blk *nextone = NULL; // pointer at next block to process
57 int pstat; // poll status
58 int kstat; // keyboard status
59 struct timeval delay; // delay to use on select call
60 struct sockaddr *uaddr; // pointer to udp address
62 if( gptr->flags & GIF_SHUTDOWN ) // cannot do if we should shutdown
63 return( SI_ERROR ); // so just get out
66 if( gptr->magicnum != MAGICNUM ) // if not a valid ginfo block
69 delay.tv_sec = msdelay/100; // user submits 100ths, cvt to seconds and milliseconds
70 delay.tv_usec = (msdelay%100) * 10;
73 SIbldpoll( gptr ); // build the fdlist for poll
74 pstat = 0; // ensure good code
76 if( gptr->fdcount > 0 )
77 pstat = select( gptr->fdcount, &gptr->readfds, &gptr->writefds,
78 &gptr->execpfds, &delay );
80 if( (pstat < 0 && errno != EINTR) )
81 { // poll fail or termination signal rcvd
82 gptr->fdcount = 0; // prevent trying to look at a session
83 gptr->flags |= GIF_SHUTDOWN; // cause cleanup and exit at end
84 //deaths = 0; // dont need to issue waits on dead child
85 //sigflags = 0; // who cares about signals now too
89 while( deaths > 0 ) // there have been death(s) - keep the dead
90 { // from being zombies - send them to heaven
91 wait( NULL ); // issue wait on child
93 } // end while dead children to send to heaven
97 if( sigflags && // if signal received and processing them
98 (cbptr = gptr->cbtab[SI_CB_SIGNAL].cbrtn) != NULL )
100 while( sigflags != 0 )
102 i = sigflags; // hold for call
103 sigflags = 0; // incase we are interrupted while away
104 status = (*cbptr)( gptr->cbtab[SI_CB_SIGNAL].cbdata, i );
105 SIcbstat( gptr, status, SI_CB_SIGNAL ); // handle status
110 if( pstat > 0 && (! (gptr->flags & GIF_SHUTDOWN)) )
112 if( FD_ISSET( 0, &gptr->readfds ) ) // check for keybd input
114 fgets( ibuf, 1024, stdin ); // get the stuff from keyboard
115 if( (cbptr = gptr->cbtab[SI_CB_KDATA].cbrtn) != NULL )
117 status = (*cbptr)( gptr->cbtab[SI_CB_KDATA].cbdata, ibuf );
118 SIcbstat( gptr, status, SI_CB_KDATA ); // handle status
119 } // end if call back was defined
122 // for( tpptr = gptr->tplist; tpptr != NULL; tpptr = tpptr->next )
123 tpptr = gptr->tplist;
124 while( tpptr != NULL ) {
125 nextone = tpptr->next; // allow for a delete in loop
127 if( tpptr->squeue != NULL && (FD_ISSET( tpptr->fd, &gptr->writefds )) )
128 SIsend( gptr, tpptr ); // send if clear to send
130 if( FD_ISSET( tpptr->fd, &gptr->execpfds ) )
132 ; // sunos seems to set except for unknown reasons; ignore
135 if( FD_ISSET( tpptr->fd, &gptr->readfds ) ) // read event pending?
137 fd = tpptr->fd; // quick ref to the fd
139 if( tpptr->flags & TPF_LISTENFD ) // listen port setup by init?
140 { // yes-assume new session req
141 status = SInewsession( gptr, tpptr ); // make new session
143 else // data received on a regular port
144 if( tpptr->type == SOCK_DGRAM ) // udp socket?
146 uaddr = (struct sockaddr *) malloc( sizeof( struct sockaddr ) );
147 status = RECVFROM( fd, gptr->rbuf, MAX_RBUF, 0, uaddr, &addrlen );
148 if( status >= 0 && ! (tpptr->flags & TPF_DRAIN) )
149 { // if good status call cb routine
150 if( (cbptr = gptr->cbtab[SI_CB_RDATA].cbrtn) != NULL )
152 SIaddress( uaddr, (void **) &buf, AC_TODOT );
153 status = (*cbptr)( gptr->cbtab[SI_CB_RDATA].cbdata, gptr->rbuf, status, buf );
154 SIcbstat( gptr, status, SI_CB_RDATA ); // handle status
156 } // end if call back was defined
157 } // end if status was ok
161 { // else receive on tcp session
162 status = RECV( fd, gptr->rbuf, MAX_RBUF, 0 ); // read data
164 if( status > SI_OK && ! (tpptr->flags & TPF_DRAIN) )
166 if( (cbptr = gptr->cbtab[SI_CB_CDATA].cbrtn) != NULL )
168 status = (*cbptr)( gptr->cbtab[SI_CB_CDATA].cbdata, fd, gptr->rbuf, status );
169 SIcbstat( gptr, status, SI_CB_CDATA ); // handle cb status
170 } // end if call back was defined
171 } // end if status was ok
172 else // sunos seems to send 0 bytes as indication of disc
174 if( (cbptr = gptr->cbtab[SI_CB_DISC].cbrtn) != NULL )
176 status = (*cbptr)( gptr->cbtab[SI_CB_DISC].cbdata, tpptr->fd );
177 SIcbstat( gptr, status, SI_CB_DISC ); // handle status
179 SIterm( gptr, tpptr );
182 } // end if event on this fd
185 } // end for each fd in the list
186 } // end if not in shutdown
189 if( gptr->flags & GIF_SHUTDOWN ) // we need to stop for some reason
191 status = SI_ERROR; // status should indicate to user to die
192 SIshutdown( gptr ); // clean things up
195 status = SI_OK; // user can continue to process
197 return( status ); // send status back to caller