2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 /*******************************************************************\
12 * Information Technology Center *
13 * Carnegie-Mellon University *
17 \*******************************************************************/
21 IO Manager routines & server process for VICE server.
24 /* This controls the size of an fd_set; it must be defined early before
25 * the system headers define that type and the macros that operate on it.
26 * Its value should be as large as the maximum file descriptor limit we
27 * are likely to run into on any platform. Right now, that is 65536
28 * which is the default hard fd limit on Solaris 9 */
29 /* We don't do this on Windows because on that platform there is code
30 * which allocates fd_set's on the stack (IOMGR_Sleep on Win9x, and
31 * FDSetAnd on WinNT) */
33 #define FD_SETSIZE 65536
36 #include <afsconfig.h>
37 #include <afs/param.h>
41 #ifdef HAVE_SYS_SELECT_H
42 #include <sys/select.h>
50 typedef unsigned char bool;
55 #define MIN(a,b) (((a)>(b)) ? (b) : (a))
59 #define NSIG 8*sizeof(sigset_t)
62 static int SignalSignals(void);
64 /********************************\
66 * Stuff for managing IoRequests *
68 \********************************/
72 /* Pid of process making request (for use in IOMGR_Cancel */
75 /* Descriptor masks for requests */
81 struct TM_Elem timeout;
83 /* Result of select call */
86 struct IoRequest *next; /* for iorFreeList */
90 /********************************\
92 * Stuff for managing signals *
94 \********************************/
96 #define badsig(signo) (((signo) <= 0) || ((signo) >= NSIG))
97 #define mysigmask(signo) (1 << ((signo)-1))
100 fd_set openMask; /* mask of open files on an IOMGR abort */
101 static afs_int32 sigsHandled; /* sigmask(signo) is on if we handle signo */
102 static int anySigsDelivered; /* true if any have been delivered. */
104 static struct sigaction oldActions[NSIG]; /* the old signal vectors */
106 static char *sigEvents[NSIG]; /* the event to do an LWP signal on */
107 static int sigDelivered[NSIG]; /* True for signals delivered so far.
108 This is an int array to make sure
109 there are no conflicts when trying
111 /* software 'signals' */
113 static void *(*sigProc[NSOFTSIG])(void *);
114 static void *sigRock[NSOFTSIG];
117 static struct IoRequest *iorFreeList = 0;
119 static struct TM_Elem *Requests; /* List of requests */
120 static struct timeval iomgr_timeout; /* global so signal handler can zap it */
122 /* stuff for debugging */
123 static int iomgr_errno;
124 static struct timeval iomgr_badtv;
125 static PROCESS iomgr_badpid;
126 static void SignalIO(int fds, fd_set *rfds, fd_set *wfds, fd_set *efs,
128 static void SignalTimeout(int code, struct timeval *timeout);
130 /* fd_set pool managment.
131 * Use the pool instead of creating fd_set's on the stack. fd_set's can be
132 * 8K in size, so making three could put 24K in the limited space of an LWP
135 struct IOMGR_fd_set {
136 struct IOMGR_fd_set *next;
137 } *iomgrFreeFDSets = (struct IOMGR_fd_set*)0;
140 * Return fd_set to the free list.
142 void IOMGR_FreeFDSet(fd_set *s)
144 struct IOMGR_fd_set *t = (struct IOMGR_fd_set *)s;
146 t->next = iomgrFreeFDSets;
151 * returns a zeroed fd_set or null if could not malloc one.
153 fd_set *IOMGR_AllocFDSet(void)
155 struct IOMGR_fd_set *t;
156 if (iomgrFreeFDSets) {
158 iomgrFreeFDSets = iomgrFreeFDSets->next;
161 t = malloc(sizeof(fd_set));
171 #define FreeRequest(x) ((x)->next = iorFreeList, iorFreeList = (x))
173 static struct IoRequest *NewRequest(void)
175 struct IoRequest *request;
177 if ((request=iorFreeList))
178 iorFreeList = (struct IoRequest *) (request->next);
179 else request = calloc(1, sizeof(struct IoRequest));
184 #define Purge(list) FOR_ALL_ELTS(req, list, { free(req->BackPointer); })
187 /* FD_SET support routines. All assume the fd_set size is a multiple of an int
188 * so we can at least do logical operations on ints instead of chars.
190 * For each routine, nfds is the highest bit set in either fd_set, starting
194 #define FD_N_ZERO(A, x) FD_ZERO(x)
196 #define FDS_P_POS (sizeof(int)*8)
197 #define INTS_PER_FDS(x) (((x)+(FDS_P_POS-1)) / FDS_P_POS)
198 #define FD_N_ZERO(nfds, x) memset((char*)(x), 0, (INTS_PER_FDS(nfds))*sizeof(int))
201 /* On Linux without __USE_XOPEN, we have __fds_bits. With __USE_XOPEN, or
202 * non-Linux, we have fds_bits. */
203 #if defined(AFS_LINUX22_ENV) && (__GLIBC_MINOR__ > 0) && !defined(__USE_XOPEN)
204 # define FDS_BITS __fds_bits
206 # define FDS_BITS fds_bits
209 /* FDSetCmp - returns 1 if any bits in fd_set1 are also set in fd_set2.
210 * If nfds is 0, or one of the fd_sets is null return 0 (since there is no bit
211 * set in both fd_sets).
213 static int FDSetCmp(int nfds, fd_set *fd_set1, fd_set *fd_set2)
217 if (fd_set1 == (fd_set*)0 || fd_set2 == (fd_set*)0)
221 if (fd_set1->fd_count == 0 || fd_set2->fd_count == 0)
224 for (i=0; i<fd_set1->fd_count; i++) {
225 for (j=0; j<fd_set2->fd_count; j++) {
226 if (fd_set1->fd_array[i] == fd_set2->fd_array[j])
234 j = INTS_PER_FDS(nfds);
235 for (i=0; i<j; i++) {
236 if (fd_set1->FDS_BITS[i] & fd_set2->FDS_BITS[i])
243 /* FDSetSet - set bits from fd_set2 into fd_set1
245 static void FDSetSet(int nfds, fd_set *fd_set1, fd_set *fd_set2)
252 if (fd_set1 == (fd_set*)0 || fd_set2 == (fd_set*)0)
256 if (fd_set2->fd_count==0)
259 for (i=0; i<fd_set2->fd_count; i++)
260 FD_SET(fd_set2->fd_array[i], fd_set1);
265 for (i = 0, n = INTS_PER_FDS(nfds); i < n; i++) {
266 fd_set1->FDS_BITS[i] |= fd_set2->FDS_BITS[i];
271 /* FDSetAnd - fd_set1 <- fd_set1 & fd_set2.
274 static void FDSetAnd(int nfds, fd_set *fd_set1, fd_set *fd_set2)
279 if (fd_set1 == NULL || fd_set1->fd_count == 0)
282 if (fd_set2 == NULL || fd_set2->fd_count == 0) {
287 for (i=0; i<fd_set2->fd_count; i++) {
288 if (FD_ISSET(fd_set2->fd_array[i], fd_set1))
289 FD_SET(fd_set2->fd_array[i], &tmpset);
295 static void FDSetAnd(int nfds, fd_set *fd_set1, fd_set *fd_set2)
299 if (nfds == 0 || fd_set1 == (fd_set*)0 || fd_set2 == (fd_set*)0)
302 n = INTS_PER_FDS(nfds);
303 for (i=0; i<n; i++) {
304 fd_set1->FDS_BITS[i] &= fd_set2->FDS_BITS[i];
309 /* FDSetEmpty - return true if fd_set is empty
311 static int FDSetEmpty(int nfds, fd_set *fds)
319 if (fds == (fd_set*)0)
323 if (fds->fd_count == 0)
328 n = INTS_PER_FDS(nfds);
330 for (i=n-1; i>=0; i--) {
331 if (fds->FDS_BITS[i])
342 /* The IOMGR process */
345 * Important invariant: process->iomgrRequest is null iff request not in timer
347 * also, request->pid is valid while request is in queue,
348 * also, don't signal selector while request in queue, since selector frees
352 /* These are not declared in IOMGR so that they don't use up 6K of stack. */
353 static fd_set IOMGR_readfds, IOMGR_writefds, IOMGR_exceptfds;
354 static int IOMGR_nfds = 0;
356 static void *IOMGR(void *dummy)
360 struct TM_Elem *earliest;
361 struct timeval timeout, junk;
364 FD_ZERO(&IOMGR_readfds);
365 FD_ZERO(&IOMGR_writefds);
366 FD_ZERO(&IOMGR_exceptfds);
369 /* Wake up anyone who has expired or who has received a
370 Unix signal between executions. Keep going until we
373 woke_someone = FALSE;
374 /* Wake up anyone waiting on signals. */
375 /* Note: SignalSignals() may yield! */
376 if (anySigsDelivered && SignalSignals ())
378 FT_GetTimeOfDay(&junk, 0); /* force accurate time check */
381 struct IoRequest *req;
382 struct TM_Elem *expired;
383 expired = TM_GetExpired(Requests);
384 if (expired == NULL) break;
386 req = (struct IoRequest *) expired -> BackPointer;
388 if (lwp_debug != 0) puts("[Polling SELECT]");
391 if (req->readfds) FD_N_ZERO(req->nfds, req->readfds);
392 if (req->writefds) FD_N_ZERO(req->nfds, req->writefds);
393 if (req->exceptfds) FD_N_ZERO(req->nfds, req->exceptfds);
395 req->result = 0; /* no fds ready */
396 TM_Remove(Requests, &req->timeout);
398 req -> timeout.Next = (struct TM_Elem *) 2;
399 req -> timeout.Prev = (struct TM_Elem *) 2;
401 LWP_QSignal(req->pid);
402 req->pid->iomgrRequest = 0;
405 if (woke_someone) LWP_DispatchProcess();
406 } while (woke_someone);
408 /* Collect requests & update times */
409 FD_ZERO(&IOMGR_readfds);
410 FD_ZERO(&IOMGR_writefds);
411 FD_ZERO(&IOMGR_exceptfds);
414 FOR_ALL_ELTS(r, Requests, {
415 struct IoRequest *req;
416 req = (struct IoRequest *) r -> BackPointer;
417 FDSetSet(req->nfds, &IOMGR_readfds, req->readfds);
418 FDSetSet(req->nfds, &IOMGR_writefds, req->writefds);
419 FDSetSet(req->nfds, &IOMGR_exceptfds, req->exceptfds);
420 if (req->nfds > IOMGR_nfds)
421 IOMGR_nfds = req->nfds;
423 earliest = TM_GetEarliest(Requests);
424 if (earliest != NULL) {
425 timeout = earliest -> TimeLeft;
430 if (lwp_debug != 0) {
433 printf("[Read Select:");
434 if (IOMGR_readfds.fd_count == 0)
437 for (idbg=0; idbg<IOMGR_readfds.fd_count; idbg++)
438 printf(" %d", IOMGR_readfds.fd_array[idbg]);
441 printf("[Write Select:");
442 if (IOMGR_writefds.fd_count == 0)
445 for (idbg=0; idbg<IOMGR_writefds.fd_count; idbg++)
446 printf(" %d", IOMGR_writefds.fd_array[idbg]);
449 printf("[Except Select:");
450 if (IOMGR_exceptfds.fd_count == 0)
453 for (idbg=0; idbg<IOMGR_exceptfds.fd_count; idbg++)
454 printf(" %d", IOMGR_exceptfds.fd_array[idbg]);
458 /* Only prints first 32. */
459 printf("[select(%d, 0x%x, 0x%x, 0x%x, ", IOMGR_nfds,
460 *(int*)&IOMGR_readfds, *(int*)&IOMGR_writefds,
461 *(int*)&IOMGR_exceptfds);
462 #endif /* AFS_NT40_ENV */
463 if (timeout.tv_sec == -1 && timeout.tv_usec == -1)
466 printf("<%d, %d>)]\n", timeout.tv_sec, timeout.tv_usec);
469 iomgr_timeout = timeout;
470 if (timeout.tv_sec == -1 && timeout.tv_usec == -1) {
471 /* infinite, sort of */
472 iomgr_timeout.tv_sec = 100000000;
473 iomgr_timeout.tv_usec = 0;
475 #if defined(AFS_NT40_ENV) || defined(AFS_LINUX24_ENV)
476 /* On NT, signals don't interrupt a select call. So this can potentially
477 * lead to long wait times before a signal is honored. To avoid this we
478 * dont do select() for longer than IOMGR_MAXWAITTIME (5 secs) */
479 /* Whereas Linux seems to sometimes "lose" signals */
480 if (iomgr_timeout.tv_sec > (IOMGR_MAXWAITTIME - 1)) {
481 iomgr_timeout.tv_sec = IOMGR_MAXWAITTIME;
482 iomgr_timeout.tv_usec = 0;
486 /* Check one last time for a signal delivery. If one comes after
487 this, the signal handler will set iomgr_timeout to zero, causing
488 the select to return immediately. The timer package won't return
489 a zero timeval because all of those guys were handled above.
491 I'm assuming that the kernel masks signals while it's picking up
492 the parameters to select. This may a bad assumption. -DN */
493 if (anySigsDelivered)
494 continue; /* go to the top and handle them. */
497 if (IOMGR_readfds.fd_count == 0 && IOMGR_writefds.fd_count == 0
498 && IOMGR_exceptfds.fd_count == 0) {
501 if (iomgr_timeout.tv_sec || iomgr_timeout.tv_usec) {
502 stime = iomgr_timeout.tv_sec * 1000
503 + iomgr_timeout.tv_usec/1000;
511 { /* select runs much faster if 0's are passed instead of &0s */
512 code = select(IOMGR_nfds,
513 (FDSetEmpty(IOMGR_nfds, &IOMGR_readfds)) ?
514 (fd_set*)0 : &IOMGR_readfds,
515 (FDSetEmpty(IOMGR_nfds, &IOMGR_writefds)) ?
516 (fd_set*)0 : &IOMGR_writefds,
517 (FDSetEmpty(IOMGR_nfds, &IOMGR_exceptfds)) ?
518 (fd_set*)0 : &IOMGR_exceptfds,
525 #if defined(AFS_SUN_ENV)
526 /* Tape drives on Sun boxes do not support select and return ENXIO */
527 if (errno == ENXIO) e=0, code=1;
529 #if defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_OSF_ENV) || defined(AFS_AIX32_ENV)
530 /* For SGI and SVR4 - poll & select can return EAGAIN ... */
531 if (errno == EAGAIN) e=0;
533 #if defined(AFS_SUN5_ENV)
534 /* On sun4x_55, select doesn't block signal. It could be
535 interupted by a signal that changes iomgr_timeout, and
536 then select returns with EINVAL. In this case, we need
539 if (errno==EINVAL && anySigsDelivered)
541 #endif /* AFS_SUN5_ENV */
543 if ((errno != EINTR) && e) {
546 for(i=0; i<FD_SETSIZE; i++) {
547 if (fcntl(i, F_GETFD, 0) < 0 && errno == EBADF)
548 FD_SET(i, &openMask);
556 /* See what happened */
558 /* Action -- wake up everyone involved */
559 SignalIO(IOMGR_nfds, &IOMGR_readfds, &IOMGR_writefds,
560 &IOMGR_exceptfds, code);
563 && (iomgr_timeout.tv_sec != 0 || iomgr_timeout.tv_usec != 0)) {
564 /* Real timeout only if signal handler hasn't set
565 iomgr_timeout to zero. */
567 #if defined(AFS_NT40_ENV) || defined(AFS_LINUX24_ENV)
568 /* On NT, real timeout only if above and if iomgr_timeout
569 * interval is equal to timeout interval (i.e., not adjusted
570 * to check for pseudo-signals).
572 /* And also for Linux as above */
573 if (iomgr_timeout.tv_sec != timeout.tv_sec ||
574 iomgr_timeout.tv_usec != timeout.tv_usec) {
575 /* signal check interval timed out; not real timeout */
578 #endif /* AFS_NT40_ENV */
579 FT_GetTimeOfDay(&junk, 0);
580 SignalTimeout(code, &timeout);
583 LWP_DispatchProcess();
585 return (void *)-1; /* keeps compilers happy. */
588 /************************\
590 * Signalling routines *
592 \************************/
594 static void SignalIO(int fds, fd_set *readfds, fd_set *writefds,
595 fd_set *exceptfds, int code)
598 /* Look at everyone who's bit mask was affected */
599 FOR_ALL_ELTS(r, Requests, {
600 struct IoRequest *req;
602 req = (struct IoRequest *) r -> BackPointer;
603 nfds = MIN(fds, req->nfds);
604 if (FDSetCmp(nfds, req->readfds, readfds) ||
605 FDSetCmp(nfds, req->writefds, writefds) ||
606 FDSetCmp(nfds, req->exceptfds, exceptfds)) {
607 /* put ready fd's into request. */
608 FDSetAnd(nfds, req->readfds, readfds);
609 FDSetAnd(nfds, req->writefds, writefds);
610 FDSetAnd(nfds, req->exceptfds, exceptfds);
611 req -> result = code;
612 TM_Remove(Requests, &req->timeout);
613 LWP_QSignal(pid=req->pid);
614 pid->iomgrRequest = 0;
619 static void SignalTimeout(int code, struct timeval *timeout)
621 /* Find everyone who has specified timeout */
622 FOR_ALL_ELTS(r, Requests, {
623 struct IoRequest *req;
625 req = (struct IoRequest *) r -> BackPointer;
626 if (TM_eql(&r->TimeLeft, timeout)) {
627 req -> result = code;
628 TM_Remove(Requests, &req->timeout);
629 LWP_QSignal(pid=req->pid);
630 pid->iomgrRequest = 0;
636 /*****************************************************\
638 * Signal handling routine (not to be confused with *
639 * signalling routines, above). *
641 \*****************************************************/
642 static void SigHandler (int signo)
644 if (badsig(signo) || (sigsHandled & mysigmask(signo)) == 0)
645 return; /* can't happen. */
646 sigDelivered[signo] = TRUE;
647 anySigsDelivered = TRUE;
648 /* Make sure that the IOMGR process doesn't pause on the select. */
649 iomgr_timeout.tv_sec = 0;
650 iomgr_timeout.tv_usec = 0;
653 /* Alright, this is the signal signalling routine. It delivers LWP signals
654 to LWPs waiting on Unix signals. NOW ALSO CAN YIELD!! */
655 static int SignalSignals (void)
662 anySigsDelivered = FALSE;
664 /* handle software signals */
665 stackSize = (AFS_LWP_MINSTACKSIZE < lwp_MaxStackSeen? lwp_MaxStackSeen : AFS_LWP_MINSTACKSIZE);
666 for (i=0; i < NSOFTSIG; i++) {
668 if ((p=sigProc[i])) /* This yields!!! */
669 LWP_CreateProcess2(p, stackSize, LWP_NORMAL_PRIORITY,
670 sigRock[i], "SignalHandler", &pid);
674 for (i = 1; i <= NSIG; ++i) /* forall !badsig(i) */
675 if ((sigsHandled & mysigmask(i)) && sigDelivered[i] == TRUE) {
676 sigDelivered[i] = FALSE;
677 LWP_NoYieldSignal (sigEvents[i]);
684 /***************************\
686 * User-callable routines *
688 \***************************/
691 /* Keep IOMGR process id */
692 static PROCESS IOMGR_Id = NULL;
694 int IOMGR_SoftSig(void *(*aproc)(void *), void *arock)
697 for (i=0;i<NSOFTSIG;i++) {
698 if (sigProc[i] == 0) {
702 anySigsDelivered = TRUE;
703 iomgr_timeout.tv_sec = 0;
704 iomgr_timeout.tv_usec = 0;
712 int IOMGR_Initialize(void)
716 /* If lready initialized, just return */
717 if (IOMGR_Id != NULL) return LWP_SUCCESS;
719 /* Init LWP if someone hasn't yet. */
720 if (LWP_InitializeProcessSupport (LWP_NORMAL_PRIORITY, &pid) != LWP_SUCCESS)
723 /* Initialize request lists */
724 if (TM_Init(&Requests) < 0) return -1;
726 /* Initialize signal handling stuff. */
728 anySigsDelivered = TRUE; /* A soft signal may have happened before
729 IOMGR_Initialize: so force a check for signals regardless */
731 return LWP_CreateProcess(IOMGR, AFS_LWP_MINSTACKSIZE, 0, (void *) 0,
732 "IO MANAGER", &IOMGR_Id);
735 int IOMGR_Finalize(void)
741 status = LWP_DestroyProcess(IOMGR_Id);
746 /* signal I/O for anyone who is waiting for a FD or a timeout; not too cheap,
747 * since forces select and timeofday check */
748 int IOMGR_Poll(void) {
749 fd_set *readfds, *writefds, *exceptfds;
754 FT_GetTimeOfDay(&tv, 0); /* force accurate time check */
757 struct IoRequest *req;
758 struct TM_Elem *expired;
759 expired = TM_GetExpired(Requests);
760 if (expired == NULL) break;
761 req = (struct IoRequest *) expired -> BackPointer;
763 if (lwp_debug != 0) puts("[Polling SELECT]");
766 if (req->readfds) FD_N_ZERO(req->nfds, req->readfds);
767 if (req->writefds) FD_N_ZERO(req->nfds, req->writefds);
768 if (req->exceptfds) FD_N_ZERO(req->nfds, req->exceptfds);
770 req->result = 0; /* no fds ready */
771 TM_Remove(Requests, &req->timeout);
773 req -> timeout.Next = (struct TM_Elem *) 2;
774 req -> timeout.Prev = (struct TM_Elem *) 2;
776 LWP_QSignal(req->pid);
777 req->pid->iomgrRequest = 0;
780 /* Collect requests & update times */
781 readfds = IOMGR_AllocFDSet();
782 writefds = IOMGR_AllocFDSet();
783 exceptfds = IOMGR_AllocFDSet();
784 if (!(readfds && writefds && exceptfds)) {
785 fprintf(stderr, "IOMGR_Poll: Could not malloc space for fd_sets.\n");
791 FOR_ALL_ELTS(r, Requests, {
792 struct IoRequest *req;
793 req = (struct IoRequest *) r -> BackPointer;
794 FDSetSet(req->nfds, readfds, req->readfds);
795 FDSetSet(req->nfds, writefds, req->writefds);
796 FDSetSet(req->nfds, exceptfds, req->exceptfds);
805 if (readfds->fd_count == 0 && writefds->fd_count == 0
806 && exceptfds->fd_count == 0)
808 code = select(fds, readfds, writefds, exceptfds, &tv);
810 SignalIO(fds, readfds, writefds, exceptfds, code);
813 if (readfds) IOMGR_FreeFDSet(readfds);
814 if (writefds) IOMGR_FreeFDSet(writefds);
815 if (exceptfds) IOMGR_FreeFDSet(exceptfds);
818 LWP_DispatchProcess(); /* make sure others run */
819 LWP_DispatchProcess();
823 int IOMGR_Select(int fds, fd_set *readfds, fd_set *writefds,
824 fd_set *exceptfds, struct timeval *timeout)
826 struct IoRequest *request;
830 if(fds > FD_SETSIZE) {
831 fprintf(stderr, "IOMGR_Select: fds=%d, more than max %d\n",
838 /* See if polling request. If so, handle right here */
839 if (timeout != NULL) {
840 if (timeout->tv_sec == 0 && timeout->tv_usec == 0) {
843 if (lwp_debug != 0) puts("[Polling SELECT]");
845 #if defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_OSF_ENV) || defined(AFS_AIX32_ENV) || defined(AFS_NT40_ENV)
848 code = select(fds, readfds, writefds, exceptfds, timeout);
849 #if defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_OSF_ENV) || defined(AFS_AIX32_ENV)
851 * For SGI and SVR4 - poll & select can return EAGAIN ...
854 * this is basically for SGI, but I believe stock SVR4 (Solaris?)
855 * can also get this error return
857 if (code < 0 && errno == EAGAIN)
861 if (code == SOCKET_ERROR) {
862 if (WSAGetLastError() == WSAEINPROGRESS)
868 return (code > 1 ? 1 : code);
872 /* Construct request block & insert */
873 request = NewRequest(); /* zeroes fd_set's */
874 if (readfds && !FDSetEmpty(fds, readfds))
875 request->readfds = readfds;
876 if (writefds && !FDSetEmpty(fds, writefds))
877 request->writefds = writefds;
878 if (exceptfds && !FDSetEmpty(fds, exceptfds))
879 request->exceptfds = exceptfds;
882 if (timeout == NULL) {
883 request -> timeout.TotalTime.tv_sec = -1;
884 request -> timeout.TotalTime.tv_usec = -1;
886 request -> timeout.TotalTime = *timeout;
887 /* check for bad request */
888 if (timeout->tv_sec < 0 || timeout->tv_usec < 0 || timeout->tv_usec > 999999) {
890 iomgr_badtv = *timeout;
891 iomgr_badpid = LWP_ActiveProcess;
892 /* now fixup request */
893 if(request->timeout.TotalTime.tv_sec < 0)
894 request->timeout.TotalTime.tv_sec = 1;
895 request->timeout.TotalTime.tv_usec = 100000;
899 request -> timeout.BackPointer = (char *) request;
901 /* Insert my PID in case of IOMGR_Cancel */
902 request -> pid = LWP_ActiveProcess;
903 LWP_ActiveProcess -> iomgrRequest = request;
906 request -> timeout.Next = (struct TM_Elem *) 1;
907 request -> timeout.Prev = (struct TM_Elem *) 1;
909 TM_Insert(Requests, &request->timeout);
911 /* Wait for action */
914 /* Update parameters & return */
915 result = request -> result;
917 FreeRequest(request);
918 return (result > 1 ? 1 : result);
921 int IOMGR_Cancel(PROCESS pid)
923 struct IoRequest *request;
925 if ((request = pid->iomgrRequest) == 0) return -1; /* Pid not found */
927 if (request->readfds) FD_N_ZERO(request->nfds, request->readfds);
928 if (request->writefds) FD_N_ZERO(request->nfds, request->writefds);
929 if (request->exceptfds) FD_N_ZERO(request->nfds, request->exceptfds);
932 request -> result = -2;
933 TM_Remove(Requests, &request->timeout);
935 request -> timeout.Next = (struct TM_Elem *) 5;
936 request -> timeout.Prev = (struct TM_Elem *) 5;
938 LWP_QSignal(request->pid);
939 pid->iomgrRequest = 0;
945 /* Cause delivery of signal signo to result in a LWP_SignalProcess of
947 int IOMGR_Signal (int signo, char *event)
954 return LWP_EBADEVENT;
955 sa.sa_handler = SigHandler;
956 sigfillset(&sa.sa_mask); /* mask all signals */
958 sigsHandled |= mysigmask(signo);
959 sigEvents[signo] = event;
960 sigDelivered[signo] = FALSE;
961 if (sigaction (signo, &sa, &oldActions[signo]) == -1)
966 /* Stop handling occurrences of signo. */
967 int IOMGR_CancelSignal (int signo)
969 if (badsig(signo) || (sigsHandled & mysigmask(signo)) == 0)
971 sigaction (signo, &oldActions[signo], NULL);
972 sigsHandled &= ~mysigmask(signo);
975 #endif /* AFS_NT40_ENV */
976 /* This routine calls select is a fashion that simulates the standard sleep routine */
977 void IOMGR_Sleep (int seconds)
979 struct timeval timeout;
981 timeout.tv_sec = seconds;
983 IOMGR_Select(0, 0, 0, 0, &timeout);