/*
* open a file in an arbitrary directory
*
* NB: if the passed pathname is relative (which it usually is),
* it will be interpreted relative to the process' working directory
* (which should always be $PGDATA when this code is running).
*/
File
PathNameOpenFile(FileName fileName, int fileFlags, int fileMode)
{
char *fnamecopy;
File file;
Vfd *vfdP;
DO_DB(elog(LOG, "PathNameOpenFile: %s %x %o",
fileName, fileFlags, fileMode));
/*
* We need a malloc'd copy of the file name; fail cleanly if no room.
*/
fnamecopy = strdup(fileName);
if (fnamecopy == NULL)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
file = AllocateVfd();
vfdP = &VfdCache[file];
while (nfile + numAllocatedDescs >= max_safe_fds)
{
if (!ReleaseLruFile())
break;
}
vfdP->fd = BasicOpenFile(fileName, fileFlags, fileMode);
if (vfdP->fd < 0)
{
FreeVfd(file);
free(fnamecopy);
return -1;
}
++nfile;
DO_DB(elog(LOG, "PathNameOpenFile: success %d",
vfdP->fd));
Insert(file);
vfdP->fileName = fnamecopy;
/* Saved flags are adjusted to be OK for re-opening file */
vfdP->fileFlags = fileFlags & ~(O_CREAT | O_TRUNC | O_EXCL);
vfdP->fileMode = fileMode;
vfdP->seekPos = 0;
vfdP->fdstate = 0x0;
vfdP->resowner = NULL;
return file;
}
/* VARARGS2 */
static File
fileNameOpenFile(FileName fileName,
int fileFlags,
int fileMode)
{
static int osRanOut = 0;
File file;
Vfd *vfdP;
int tmpfd;
DO_DB(printf("DEBUG: FileNameOpenFile: %s %x %o\n",
fileName, fileFlags, fileMode));
file = AllocateVfd();
vfdP = &VfdCache[file];
if (nfile >= MAXFILES || (FreeFd == 0 && osRanOut)) {
AssertLruRoom();
}
tryAgain:
tmpfd = open(Nulldev, O_CREAT|O_RDWR, 0666);
if (tmpfd < 0) {
DO_DB(printf("DB: not enough descs, retry, er= %d\n",
errno));
errno = 0;
FreeFd = 0;
osRanOut = 1;
AssertLruRoom();
goto tryAgain;
} else {
close(tmpfd);
}
#ifdef WIN32
fileFlags |= _O_BINARY;
#endif /* WIN32 */
vfdP->fd = open(fileName,fileFlags,fileMode);
vfdP->fdstate = 0x0;
if (vfdP->fd < 0) {
FreeVfd(file);
return -1;
}
++nfile;
DO_DB(printf("DB: FNOF success %d\n",
vfdP->fd));
(void)LruInsert(file);
if (fileName==NULL) {
elog(WARN, "fileNameOpenFile: NULL fname");
}
vfdP->fileName = malloc(strlen(fileName)+1);
strcpy(vfdP->fileName,fileName);
vfdP->fileFlags = fileFlags & ~(O_TRUNC|O_EXCL);
vfdP->fileMode = fileMode;
vfdP->seekPos = 0;
return file;
}
