1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
|
/*
* 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)
{
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)
{
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 ();
}
|