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/*
* 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 stdinOwned;
Bool stdinPolling;
Bool ioTimeoutQueued;
Bool anyFileWriteBlocked;
#ifdef HAVE_SIGACTION
#define RESTART_SIGNAL(sig,func)
#else
#define RESTART_SIGNAL(sig,func) (void) signal (sig,func)
#endif
static void
sigio (int sig)
{
(void) sig;
resetSignal (SIGIO, sigio);
SetSignalIo ();
}
void
IoInterrupt (void)
{
FileCheckBlocked (False);
}
void
IoStop (void)
{
if (stdin_interactive)
{
FileResetFd (0);
stdinOwned = False;
}
}
#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)
{
if (stdin_interactive)
{
stdinOwned = IoOwnTty (0);
if (stdinOwned)
{
stdinPolling = False;
FileSetFd (0);
}
}
else
stdinOwned = True;
}
void
IoFini (void)
{
FileStdin->file.flags |= FileBlockWrites;
FileClose (FileStdin);
FileStdout->file.flags |= FileBlockWrites;
FileClose (FileStdout);
FileStderr->file.flags |= FileBlockWrites;
FileClose (FileStderr);
}
BoxPtr FileStdinBox, FileStdoutBox, FileStderrBox;
Bool
IoTimeout (void *closure)
{
(void) closure;
if (!stdinOwned)
IoStart ();
FileCheckBlocked (False);
if (anyFileWriteBlocked || (!stdinOwned && stdinPolling)
#ifdef NO_PIPE_SIGIO
|| anyPipeReadBlocked
#endif
)
return True;
ioTimeoutQueued = False;
return False;
}
static void
IoSetupTimeout (void)
{
if (!ioTimeoutQueued)
{
ioTimeoutQueued = True;
TimerInsert (0, IoTimeout, 100, 100);
}
}
void
IoNoticeTtyUnowned (void)
{
if (!stdinOwned && !stdinPolling)
{
stdinPolling = True;
IoSetupTimeout();
}
}
void
IoNoticeWriteBlocked (void)
{
IoSetupTimeout ();
}
#ifdef NO_PIPE_SIGIO
void
IoNoticeReadBlocked (void)
{
IoSetupTimeout ();
}
#endif
static BoxPtr
IoMakeFile(int fd, int flags)
{
BoxPtr box = NewBox(False, False, 1, typePrim[rep_file]);
MemAddRoot(box);
BoxValueSet(box, 0, FileCreate(fd, flags));
return box;
}
void
IoInit (void)
{
ENTER ();
catchSignal (SIGIO, sigio);
FileStdinBox = IoMakeFile(0, FileReadable);
FileStdoutBox = IoMakeFile(1, FileWritable);
FileStderrBox = IoMakeFile(2, FileWritable);
IoStart ();
EXIT ();
}
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