/*
* Sync the memory file *mfp to disk.
* Flags:
* MFS_ALL If not given, blocks with negative numbers are not synced,
* even when they are dirty!
* MFS_STOP Stop syncing when a character becomes available, but sync at
* least one block.
* MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a
* system crash.
* MFS_ZERO Only write block 0.
*
* Return FAIL for failure, OK otherwise
*/
int
mf_sync(memfile_T *mfp, int flags)
{
int status;
bhdr_T *hp;
#if defined(SYNC_DUP_CLOSE)
int fd;
#endif
int got_int_save = got_int;
if (mfp->mf_fd < 0) /* there is no file, nothing to do */
{
mfp->mf_dirty = FALSE;
return FAIL;
}
/* Only a CTRL-C while writing will break us here, not one typed
* previously. */
got_int = FALSE;
/*
* sync from last to first (may reduce the probability of an inconsistent
* file) If a write fails, it is very likely caused by a full filesystem.
* Then we only try to write blocks within the existing file. If that also
* fails then we give up.
*/
status = OK;
for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev)
if (((flags & MFS_ALL) || hp->bh_bnum >= 0)
&& (hp->bh_flags & BH_DIRTY)
&& (status == OK || (hp->bh_bnum >= 0
&& hp->bh_bnum < mfp->mf_infile_count)))
{
if ((flags & MFS_ZERO) && hp->bh_bnum != 0)
continue;
if (mf_write(mfp, hp) == FAIL)
{
if (status == FAIL) /* double error: quit syncing */
break;
status = FAIL;
}
if (flags & MFS_STOP)
{
/* Stop when char available now. */
if (ui_char_avail())
break;
}
else
ui_breakcheck();
if (got_int)
break;
}
/*
* If the whole list is flushed, the memfile is not dirty anymore.
* In case of an error this flag is also set, to avoid trying all the time.
*/
if (hp == NULL || status == FAIL)
mfp->mf_dirty = FALSE;
if ((flags & MFS_FLUSH) && *p_sws != NUL)
{
#if defined(UNIX)
# ifdef HAVE_FSYNC
/*
* most Unixes have the very useful fsync() function, just what we need.
* However, with OS/2 and EMX it is also available, but there are
* reports of bad problems with it (a bug in HPFS.IFS).
* So we disable use of it here in case someone tries to be smart
* and changes os_os2_cfg.h... (even though there is no __EMX__ test
* in the #if, as __EMX__ does not have sync(); we hope for a timely
* sync from the system itself).
*/
# if defined(__EMX__)
error "Don't use fsync with EMX! Read emxdoc.doc or emxfix01.doc for info."
# endif
if (STRCMP(p_sws, "fsync") == 0)
{
if (fsync(mfp->mf_fd))
status = FAIL;
}
else
# endif
/* OpenNT is strictly POSIX (Benzinger) */
/* Tandem/Himalaya NSK-OSS doesn't have sync() */
/* No sync() on Stratus VOS */
# if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__)
fflush(NULL);
# else
sync();
# endif
#endif
#ifdef VMS
if (STRCMP(p_sws, "fsync") == 0)
{
if (fsync(mfp->mf_fd))
status = FAIL;
}
#endif
#ifdef SYNC_DUP_CLOSE
/*
* Win32 is a bit more work: Duplicate the file handle and close it.
* This should flush the file to disk.
*/
if ((fd = dup(mfp->mf_fd)) >= 0)
close(fd);
#endif
#ifdef AMIGA
# if defined(__AROS__) || defined(__amigaos4__)
if (fsync(mfp->mf_fd) != 0)
status = FAIL;
# else
/*
* Flush() only exists for AmigaDos 2.0.
* For 1.3 it should be done with close() + open(), but then the risk
* is that the open() may fail and lose the file....
*/
# ifdef FEAT_ARP
if (dos2)
# endif
# ifdef SASC
{
struct UFB *fp = chkufb(mfp->mf_fd);
if (fp != NULL)
Flush(fp->ufbfh);
}
# else
# if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__)
{
# if defined(__GNUC__) && !defined(__MORPHOS__) && defined(__libnix__)
/* Have function (in libnix at least),
* but ain't got no prototype anywhere. */
extern unsigned long fdtofh(int filedescriptor);
# endif
# if !defined(__libnix__)
fflush(NULL);
# else
BPTR fh = (BPTR)fdtofh(mfp->mf_fd);
if (fh != 0)
Flush(fh);
# endif
}
# else /* assume Manx */
Flush(_devtab[mfp->mf_fd].fd);
# endif
# endif
# endif
#endif /* AMIGA */
}
/*
* rpipe() - gets a `cmd' to run and a `file descriptor' to use as its stdin.
*/
int
rpipe(UBYTE * cmd, int fd)
{
BPTR fdFH = 0, /* FileHandle of passed file descriptor */
outPH = 0, /* Pipe (File) Handle for child to write to. */
inPH = 0, /* Pipe (File) Handle for child to read from. */
lock = 0;
int fdr = 0;
char pname[32], *pc;
extern char o_shell[];
if (isOldDOS())
return -1;
/*-
* Sorry, I'm playing with an AZTEC internal here:
* _devtab[fd].fd is Aztec's FileHandle for the file descriptor `fd'.
*
* HINT: For your compiler, look in your compiler's fcntl.h.
*/
switch (fd)
{
case 0:
inPH = Open((UBYTE *) "*", MODE_READWRITE);
break;
default:
#ifdef AZTEC_C
fdFH = _devtab[fd].fd; /* Grab FileHandle from fd */
#elif _DCC
fdFH = fdtofh(fd); /* DCC does it right! */
#else
return -1; /* Sorry, can't help you. */
#endif
/*
* Get a FileHandle to use for the child's stdin.
* The only reason we Dup is because we'll run the child ASynch,
* and it will close its Input and Output on exit.
*/
lock = DupLockFromFH(fdFH);
if (!lock)
return -1;
inPH = OpenFromLock(lock);
}
if (!inPH)
{
if (lock)
UnLock(lock);
return -1;
}
/*
* Get a pipe to use for the child's stdout, which we will read from.
*/
strcpy(pname, "PIPE:ElvisXXX.XXX");
pc = mktemp(pname); /* Get a unique PIPE: */
if (!*pc)
{
Close(inPH);
return -1; /* Failure. */
}
/*
* Get a FileHandle to use for the child's stdout.
*/
if ((BPTR) 0 == (outPH = Open((UBYTE *) pc, MODE_NEWFILE)))
{
Close(inPH);
return -1; /* Failure. */
}
/* Get a file descriptor to return to the calling function */
if ((fdr = open(pc, O_RDONLY)) < 0)
{
Close(inPH);
Close(outPH);
return -1; /* Failure. */
}
/* exec the cmd */
systags[0].ti_Data = inPH; /* Input FileHandle for child */
systags[1].ti_Data = outPH; /* Output FileHandle for child */
systags[2].ti_Data = (long) o_shell;/* which shell to use */
if (System((UBYTE *) cmd, systags))
{
close(fdr);
return -1; /* Failure. */
}
return fdr; /* Success! */
}
