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ThreadsUIOStream.c
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1990-09-26
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/* begincopyright
Copyright (c) 1988 Xerox Corporation. All rights reserved.
Use and copying of this software and preparation of derivative works based
upon this software are permitted. Any distribution of this software or
derivative works must comply with all applicable United States export
control laws. This software is made available AS IS, and Xerox Corporation
makes no warranty about the software, its performance or its conformity to
any specification. Any person obtaining a copy of this software is requested
to send their name and post office or electronic mail address to:
PCR Coordinator
Xerox PARC
3333 Coyote Hill Rd.
Palo Alto, CA
endcopyright */
/*
* ThreadsUIOStream.c
*
* Demers, March 30, 1990 0:30:39 am PST
* Boehm, September 26, 1990 3:51:19 pm PDT
*
* Unix I/O for Xerox Runtime threads package, System V streams descriptors.
*/
#include "xr/ThreadsBackdoor.h"
#include "xr/ThreadsSignalsPrivate.h"
#include "xr/ThreadsMsgPrivate.h"
#include "xr/ThreadsStatsPrivate.h"
#include "xr/UIO.h"
#include "xr/UIOPrivate.h"
#include "xr/Errno.h"
#include <sys/types.h>
#include <sys/file.h>
#include <sys/fcntl.h>
#define XR_PROTECT_POLL_FROM_SIGTSTP 1 /* workaround SunOS 4.0.3 bug */
#if XR_PROTECT_POLL_FROM_SIGTSTP
# include <sys/signal.h>
#endif
#undef XR_ASSERT
#define XR_ASSERT(b,s) if(!(b)) XR_Panic(s)
/*
*
* Descriptor utilities
*
*/
int
XR_UIOIOPSetNonBlockingStream (d)
int d;
{
# if STREAMS
int result, cFlags;
if( (cFlags = fcntl(d, F_GETFL, NIL)) < 0 ) {
result = -errno;
goto Out;
}
cFlags |= FNBIO;
if( fcntl(d, F_SETFL, cFlags) < 0 ) {
result = -errno;
goto Out;
}
result = d;
Out:
return(result);
# else
XR_Panic("UIOIOPSetNonBlockingStream 0");
# endif
}
int
XR_UIOPollStream(fds, nfds, timeout, flagp)
XR_WaitReadyData fds;
int nfds;
unsigned timeout;
unsigned *flagp;
{
# if STREAMS
int ans;
if( nfds == 0 ) {
/* ??? this may be unnecessary ??? */
XR_SpinStep(timeout*1000); /* *1000 for msec to usec -mdw 8/6/89 */
errno = EINTR;
ans = (-1);
} else if( (*flagp) ) {
errno = EINTR;
ans = (-1);
} else {
# if XR_PROTECT_POLL_FROM_SIGTSTP
int mask = sigblock(sigmask(SIGTSTP));
# endif
ans = poll(fds, nfds, timeout);
/* We assert XR_ProtectSysCall is inappropriate, since we are in */
/* an IOP. */
if( ans < 0 ) switch(errno) {
case EINTR:
case EAGAIN:
break;
default:
XR_ConsoleMsg("%? fds 0x%x nfds %d \n", fds, nfds);
XR_Panic("UIOPollStream 0");
}
# if XR_PROTECT_POLL_FROM_SIGTSTP
{ int sav = errno; sigsetmask(mask); errno = sav; }
# endif
}
return ans;
# else
XR_Panic("UIOPollStream 1");
return(-1);
# endif
}
/*
* Exported to UIO.h
*/
int
XR_OpenStream (name, flags, mode)
char *name;
unsigned flags;
unsigned mode;
{
return( XR_Open4(name, flags, mode, XR_FD_KIND_STREAM) );
}
#if STREAMS
struct XR_GetMsgArgsRep {
struct strbuf *gma_ctlptr;
struct strbuf *gma_dataptr;
int *gma_flags;
};
#define gma ((struct XR_GetMsgArgsRep *)(x1))
static XR_FDE_FDC_WORKER(XR_GetMsgWorker)
{
struct strbuf myCtl;
struct strbuf myData;
struct strbuf *myCtlPtr, *myDataPtr;
int myFlags;
int * myFlagsPtr;
int ans;
if ( gma->gma_dataptr ) {
myData = *(gma->gma_dataptr);
myDataPtr = &myData;
XR_ProtectSysCall(myData.buf, myData.maxlen);
} else {
myDataPtr = 0;
XR_ProtectSysCall(0,0);
}
if ( gma->gma_ctlptr ) {
myCtl = *(gma->gma_ctlptr);
myCtlPtr = &myCtl;
XR_UnprotectSeg(myCtl.buf, myCtl.maxlen);
} else {
myCtlPtr = 0;
}
if ( gma->gma_flags ) {
myFlags = *(gma->gma_flags);
myFlagsPtr = &myFlags;
} else {
myFlagsPtr = 0;
}
ans = getmsg(fdc->fdc_index, myCtlPtr, myDataPtr, myFlagsPtr);
XR_UnprotectSysCall();
if (ans >= 0) {
if( gma->gma_ctlptr ) gma->gma_ctlptr -> len = myCtl.len;
if( gma->gma_dataptr ) gma->gma_dataptr -> len = myData.len;
if( gma->gma_flags ) *(gma->gma_flags) = myFlags;
}
return( ans );
}
#undef gma
#endif
int
XR_GetMsg(fildes, ctlptr, dataptr, flags)
XR_Fildes fildes;
struct strbuf *ctlptr;
struct strbuf *dataptr;
int *flags;
{
# if STREAMS
struct XR_GetMsgArgsRep args;
XR_UIOWaitReadyProc waitReadyProc;
args.gma_ctlptr = ctlptr;
args.gma_dataptr = dataptr;
args.gma_flags = flags;
waitReadyProc = &XR_UIOInPri0WaitReadyProc;
if( (flags) && (flags[0] == RS_HIPRI) )
waitReadyProc = &XR_UIOPri0WaitReadyProc;
return(
XR_UIODoWithFDEAndFDC(
fildes,
waitReadyProc,
XR_GetMsgWorker,
((unsigned)(&args)),
0
)
);
# else
XR_SetErrno(ENOSTR);
return(-1);
# endif
}
#if STREAMS
struct XR_PutMsgArgsRep {
struct strbuf *pma_ctlptr;
struct strbuf *pma_dataptr;
int pma_flags;
};
#define pma ((struct XR_PutMsgArgsRep *)(x1))
static XR_FDE_FDC_WORKER(XR_PutMsgWorker)
{
int ans;
ans = putmsg(fdc->fdc_index,
pma->pma_ctlptr, pma->pma_dataptr, pma->pma_flags);
return( ans );
}
#undef pma
#endif
int
XR_PutMsg(fildes, ctlptr, dataptr, flags)
XR_Fildes fildes;
struct strbuf *ctlptr;
struct strbuf *dataptr;
int flags;
{
# if STREAMS
struct XR_PutMsgArgsRep args;
args.pma_ctlptr = ctlptr;
args.pma_dataptr = dataptr;
args.pma_flags = flags;
return(
XR_UIODoWithFDEAndFDC(
fildes,
&XR_UIOOut0WaitReadyProc,
XR_PutMsgWorker,
((unsigned)(&args)),
0
)
);
# else
XR_SetErrno(ENOSTR);
return(-1);
# endif
}