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-rw-r--r--runtime/stream.c103
1 files changed, 79 insertions, 24 deletions
diff --git a/runtime/stream.c b/runtime/stream.c
index 3e890c71..00afcdaa 100644
--- a/runtime/stream.c
+++ b/runtime/stream.c
@@ -81,6 +81,7 @@ static void *asyncWriterThread(void *pPtr);
static rsRetVal doZipWrite(strm_t *pThis, uchar *pBuf, size_t lenBuf, int bFlush);
static rsRetVal doZipFinish(strm_t *pThis);
static rsRetVal strmPhysWrite(strm_t *pThis, uchar *pBuf, size_t lenBuf);
+static rsRetVal strmSeekCurrOffs(strm_t *pThis);
/* methods */
@@ -197,6 +198,7 @@ static rsRetVal
doPhysOpen(strm_t *pThis)
{
int iFlags = 0;
+ struct stat statOpen;
DEFiRet;
ISOBJ_TYPE_assert(pThis, strm);
@@ -234,15 +236,71 @@ doPhysOpen(strm_t *pThis)
ABORT_FINALIZE(RS_RET_FILE_NOT_FOUND);
else
ABORT_FINALIZE(RS_RET_IO_ERROR);
+ }
+
+ if(pThis->tOperationsMode == STREAMMODE_READ) {
+ if(fstat(pThis->fd, &statOpen) == -1) {
+ DBGPRINTF("Error: cannot obtain inode# for file %s\n", pThis->pszCurrFName);
+ ABORT_FINALIZE(RS_RET_IO_ERROR);
+ }
+ pThis->inode = statOpen.st_ino;
+ }
+
+ if(!ustrcmp(pThis->pszCurrFName, UCHAR_CONSTANT(_PATH_CONSOLE)) || isatty(pThis->fd)) {
+ DBGPRINTF("file %d is a tty-type file\n", pThis->fd);
+ pThis->bIsTTY = 1;
} else {
- if(!ustrcmp(pThis->pszCurrFName, UCHAR_CONSTANT(_PATH_CONSOLE)) || isatty(pThis->fd)) {
- DBGPRINTF("file %d is a tty-type file\n", pThis->fd);
- pThis->bIsTTY = 1;
+ pThis->bIsTTY = 0;
+ }
+
+finalize_it:
+ RETiRet;
+}
+
+
+static rsRetVal
+strmSetCurrFName(strm_t *pThis)
+{
+ DEFiRet;
+
+ if(pThis->sType == STREAMTYPE_FILE_CIRCULAR) {
+ CHKiRet(genFileName(&pThis->pszCurrFName, pThis->pszDir, pThis->lenDir,
+ pThis->pszFName, pThis->lenFName, pThis->iCurrFNum, pThis->iFileNumDigits));
+ } else {
+ if(pThis->pszDir == NULL) {
+ if((pThis->pszCurrFName = ustrdup(pThis->pszFName)) == NULL)
+ ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
} else {
- pThis->bIsTTY = 0;
+ CHKiRet(genFileName(&pThis->pszCurrFName, pThis->pszDir, pThis->lenDir,
+ pThis->pszFName, pThis->lenFName, -1, 0));
}
}
+finalize_it:
+ RETiRet;
+}
+
+/* This function checks if the actual file has changed and, if so, resets the
+ * offset. This is support for monitoring files. It should be called after
+ * deserializing the strm object and before doing any other operation on it
+ * (most importantly not an open or seek!).
+ */
+static rsRetVal
+CheckFileChange(strm_t *pThis)
+{
+ struct stat statName;
+ DEFiRet;
+ CHKiRet(strmSetCurrFName(pThis));
+ if(stat((char*) pThis->pszCurrFName, &statName) == -1)
+ ABORT_FINALIZE(RS_RET_IO_ERROR);
+ DBGPRINTF("stream/after deserialize checking for file change on '%s', "
+ "inode %u/%u, size/currOffs %llu/%llu\n",
+ pThis->pszCurrFName, (unsigned) pThis->inode,
+ (unsigned) statName.st_ino, statName.st_size, pThis->iCurrOffs);
+ if(pThis->inode != statName.st_ino || statName.st_size < pThis->iCurrOffs) {
+ DBGPRINTF("stream: file %s has changed\n", pThis->pszCurrFName);
+ pThis->iCurrOffs = 0;
+ }
finalize_it:
RETiRet;
}
@@ -265,19 +323,8 @@ static rsRetVal strmOpenFile(strm_t *pThis)
if(pThis->pszFName == NULL)
ABORT_FINALIZE(RS_RET_FILE_PREFIX_MISSING);
- if(pThis->sType == STREAMTYPE_FILE_CIRCULAR) {
- CHKiRet(genFileName(&pThis->pszCurrFName, pThis->pszDir, pThis->lenDir,
- pThis->pszFName, pThis->lenFName, pThis->iCurrFNum, pThis->iFileNumDigits));
- } else {
- if(pThis->pszDir == NULL) {
- if((pThis->pszCurrFName = ustrdup(pThis->pszFName)) == NULL)
- ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
- } else {
- CHKiRet(genFileName(&pThis->pszCurrFName, pThis->pszDir, pThis->lenDir,
- pThis->pszFName, pThis->lenFName, -1, 0));
- }
- }
-
+ CHKiRet(strmSetCurrFName(pThis));
+
CHKiRet(doPhysOpen(pThis));
pThis->iCurrOffs = 0;
@@ -357,6 +404,7 @@ static rsRetVal strmCloseFile(strm_t *pThis)
if(pThis->fd != -1) {
close(pThis->fd);
pThis->fd = -1;
+ pThis->inode = 0;
}
if(pThis->fdDir != -1) {
@@ -432,18 +480,15 @@ static rsRetVal
strmHandleEOFMonitor(strm_t *pThis)
{
DEFiRet;
- struct stat statOpen;
struct stat statName;
ISOBJ_TYPE_assert(pThis, strm);
- if(fstat(pThis->fd, &statOpen) == -1)
- ABORT_FINALIZE(RS_RET_IO_ERROR);
if(stat((char*) pThis->pszCurrFName, &statName) == -1)
ABORT_FINALIZE(RS_RET_IO_ERROR);
- DBGPRINTF("stream checking for file change on '%s', inode %u/%u",
- pThis->pszCurrFName, (unsigned) statOpen.st_ino,
+ DBGPRINTF("stream checking for file change on '%s', inode %u/%u\n",
+ pThis->pszCurrFName, (unsigned) pThis->inode,
(unsigned) statName.st_ino);
- if(statOpen.st_ino == statName.st_ino) {
+ if(pThis->inode == statName.st_ino) {
ABORT_FINALIZE(RS_RET_EOF);
} else {
/* we had a file change! */
@@ -1343,7 +1388,11 @@ static rsRetVal strmSeek(strm_t *pThis, off64_t offs)
}
long long i;
DBGOPRINT((obj_t*) pThis, "file %d seek, pos %llu\n", pThis->fd, (long long unsigned) offs);
- i = lseek64(pThis->fd, offs, SEEK_SET); // TODO: check error!
+ i = lseek64(pThis->fd, offs, SEEK_SET);
+ if(i != offs) {
+ DBGPRINTF("strmSeek: error %lld seeking to offset %lld\n", i, offs);
+ ABORT_FINALIZE(RS_RET_IO_ERROR);
+ }
pThis->iCurrOffs = offs; /* we are now at *this* offset */
pThis->iBufPtr = 0; /* buffer invalidated */
@@ -1697,6 +1746,9 @@ static rsRetVal strmSerialize(strm_t *pThis, strm_t *pStrm)
l = pThis->iCurrOffs;
objSerializeSCALAR_VAR(pStrm, iCurrOffs, INT64, l);
+ l = pThis->inode;
+ objSerializeSCALAR_VAR(pStrm, inode, INT64, l);
+
objSerializePTR(pStrm, prevLineSegment, PSZ);
CHKiRet(obj.EndSerialize(pStrm));
@@ -1796,6 +1848,8 @@ static rsRetVal strmSetProperty(strm_t *pThis, var_t *pProp)
CHKiRet(strmSettOpenMode(pThis, pProp->val.num));
} else if(isProp("iCurrOffs")) {
pThis->iCurrOffs = pProp->val.num;
+ } else if(isProp("inode")) {
+ pThis->inode = (ino_t) pProp->val.num;
} else if(isProp("iMaxFileSize")) {
CHKiRet(strmSetiMaxFileSize(pThis, pProp->val.num));
} else if(isProp("iMaxFiles")) {
@@ -1865,6 +1919,7 @@ CODESTARTobjQueryInterface(strm)
pIf->GetCurrOffset = strmGetCurrOffset;
pIf->Dup = strmDup;
pIf->SetWCntr = strmSetWCntr;
+ pIf->CheckFileChange = CheckFileChange;
/* set methods */
pIf->SetbDeleteOnClose = strmSetbDeleteOnClose;
pIf->SetiMaxFileSize = strmSetiMaxFileSize;
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-25 12:58:30 +0000