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/* $Header: /local/src/CVS/nickle/io.c,v 1.13 2004/12/11 06:02:23 keithp Exp $ */
/*
* Copyright © 1988-2004 Keith Packard and Bart Massey.
* All Rights Reserved. See the file COPYING in this directory
* for licensing information.
*/
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/types.h>
#include "nickle.h"
#include "ref.h"
volatile Bool signalIo;
Bool ownTty[3];
Bool anyTtyUnowned;
Bool ioTimeoutQueued;
#ifdef HAVE_SIGACTION
#define RESTART_SIGNAL(sig,func)
#else
#define RESTART_SIGNAL(sig,func) (void) signal (sig,func)
#endif
static RETSIGTYPE
sigio (int sig)
{
resetSignal (SIGIO, sigio);
SetSignalIo ();
}
void
IoInterrupt (void)
{
FileCheckBlocked (False);
}
void
IoStop (void)
{
int fd;
for (fd = 0; fd < 3; fd++)
{
ownTty[fd] = False;
FileResetFd (fd);
}
anyTtyUnowned = True;
}
#ifdef GETPGRP_VOID
#define GetPgrp() getpgrp()
#else
#define GetPgrp() getpgrp(0)
#endif
static Bool
IoOwnTty (int fd)
{
int tpgrp;
tpgrp = tcgetpgrp (fd);
if (tpgrp == -1 || tpgrp == GetPgrp())
return True;
return False;
}
void
IoStart (void)
{
int fd;
anyTtyUnowned = False;
for (fd = 0; fd < 3; fd++)
{
ownTty[fd] = IoOwnTty (fd);
if (!ownTty[fd])
anyTtyUnowned = True;
}
if (anyTtyUnowned)
IoNoticeTtyUnowned ();
else if (stdin_interactive)
for (fd = 0; fd < 3; fd++)
FileSetFd (fd);
}
void
IoFini (void)
{
FileStdin->file.flags |= FileBlockWrites;
FileClose (FileStdin);
FileStdout->file.flags |= FileBlockWrites;
FileClose (FileStdout);
FileStderr->file.flags |= FileBlockWrites;
FileClose (FileStderr);
}
Value FileStdin, FileStdout, FileStderr;
Bool
IoTimeout (void *closure)
{
if (anyTtyUnowned)
IoStart ();
FileCheckBlocked (False);
if (anyFileWriteBlocked || anyPipeReadBlocked || anyTtyUnowned)
return True;
ioTimeoutQueued = False;
return False;
}
static void
IoSetupTimeout (void)
{
if (!ioTimeoutQueued)
{
ioTimeoutQueued = True;
TimerInsert (0, IoTimeout, 100, 100);
}
}
void
IoNoticeTtyUnowned (void)
{
IoSetupTimeout();
}
void
IoNoticeWriteBlocked (void)
{
IoSetupTimeout ();
}
void
IoNoticeReadBlocked (void)
{
IoSetupTimeout ();
}
void
IoInit (void)
{
ENTER ();
catchSignal (SIGIO, sigio);
FileStdin = FileCreate (0, FileReadable);
FileStdout = FileCreate (1, FileWritable);
FileStderr = FileCreate (2, FileWritable);
MemAddRoot (FileStdin);
MemAddRoot (FileStdout);
MemAddRoot (FileStderr);
IoStart ();
EXIT ();
}
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