static Oid lo_import_internal(PGconn *conn, const char *filename, const Oid oid) { int fd; int nbytes, tmp; char buf[LO_BUFSIZE]; Oid lobjOid; int lobj; char sebuf[256]; /* * open the file to be read in */ fd = open(filename, O_RDONLY | PG_BINARY, 0666); if (fd < 0) { /* error */ printfPQExpBuffer(&conn->errorMessage, libpq_gettext("could not open file \"%s\": %s\n"), filename, pqStrerror(errno, sebuf, sizeof(sebuf))); return InvalidOid; } /* * create an inversion object */ if (oid == InvalidOid) lobjOid = lo_creat(conn, INV_READ | INV_WRITE); else lobjOid = lo_create(conn, oid); if (lobjOid == InvalidOid) { /* we assume lo_create() already set a suitable error message */ (void) close(fd); return InvalidOid; } lobj = lo_open(conn, lobjOid, INV_WRITE); if (lobj == -1) { /* we assume lo_open() already set a suitable error message */ (void) close(fd); return InvalidOid; } /* * read in from the file and write to the large object */ while ((nbytes = read(fd, buf, LO_BUFSIZE)) > 0) { tmp = lo_write(conn, lobj, buf, nbytes); if (tmp != nbytes) { /* * If lo_write() failed, we are now in an aborted transaction so * there's no need for lo_close(); furthermore, if we tried it * we'd overwrite the useful error result with a useless one. So * just nail the doors shut and get out of town. */ (void) close(fd); return InvalidOid; } } if (nbytes < 0) { printfPQExpBuffer(&conn->errorMessage, libpq_gettext("could not read from file \"%s\": %s\n"), filename, pqStrerror(errno, sebuf, sizeof(sebuf))); lobjOid = InvalidOid; } (void) close(fd); if (lo_close(conn, lobj) != 0) { /* we assume lo_close() already set a suitable error message */ return InvalidOid; } return lobjOid; }
int lobject_open(lobjectObject *self, connectionObject *conn, Oid oid, int mode, Oid new_oid, const char *new_file) { int retvalue = -1; PGresult *pgres = NULL; char *error = NULL; Py_BEGIN_ALLOW_THREADS; pthread_mutex_lock(&(self->conn->lock)); retvalue = pq_begin_locked(self->conn, &pgres, &error); if (retvalue < 0) goto end; /* if the oid is InvalidOid we create a new lob before opening it or we import a file from the FS, depending on the value of new_name */ if (oid == InvalidOid) { if (new_file) self->oid = lo_import(self->conn->pgconn, new_file); else self->oid = lo_create(self->conn->pgconn, new_oid); Dprintf("lobject_open: large object created with oid = %d", self->oid); if (self->oid == InvalidOid) { collect_error(self->conn, &error); retvalue = -1; goto end; } mode = INV_WRITE; } else { self->oid = oid; if (mode == 0) mode = INV_READ; } /* if the oid is a real one we try to open with the given mode, unless the mode is -1, meaning "don't open!" */ if (mode != -1) { self->fd = lo_open(self->conn->pgconn, self->oid, mode); Dprintf("lobject_open: large object opened with fd = %d", self->fd); if (self->fd == -1) { collect_error(self->conn, &error); retvalue = -1; goto end; } } /* set the mode for future reference */ switch (mode) { case -1: self->smode = "n"; break; case INV_READ: self->smode = "r"; break; case INV_WRITE: self->smode = "w"; break; case INV_READ+INV_WRITE: self->smode = "rw"; break; } retvalue = 0; end: pthread_mutex_unlock(&(self->conn->lock)); Py_END_ALLOW_THREADS; if (retvalue < 0) pq_complete_error(self->conn, &pgres, &error); return retvalue; }
RAISES_NEG int lobject_open(lobjectObject *self, connectionObject *conn, Oid oid, const char *smode, Oid new_oid, const char *new_file) { int retvalue = -1; PGresult *pgres = NULL; char *error = NULL; int pgmode = 0; int mode; if (0 > (mode = _lobject_parse_mode(smode))) { return -1; } Py_BEGIN_ALLOW_THREADS; pthread_mutex_lock(&(self->conn->lock)); retvalue = pq_begin_locked(self->conn, &pgres, &error, &_save); if (retvalue < 0) goto end; /* if the oid is InvalidOid we create a new lob before opening it or we import a file from the FS, depending on the value of new_file */ if (oid == InvalidOid) { if (new_file) self->oid = lo_import(self->conn->pgconn, new_file); else { /* Use lo_creat when possible to be more middleware-friendly. See ticket #88. */ if (new_oid != InvalidOid) self->oid = lo_create(self->conn->pgconn, new_oid); else self->oid = lo_creat(self->conn->pgconn, INV_READ | INV_WRITE); } Dprintf("lobject_open: large object created with oid = %d", self->oid); if (self->oid == InvalidOid) { collect_error(self->conn, &error); retvalue = -1; goto end; } mode = (mode & ~LOBJECT_READ) | LOBJECT_WRITE; } else { self->oid = oid; } /* if the oid is a real one we try to open with the given mode */ if (mode & LOBJECT_READ) { pgmode |= INV_READ; } if (mode & LOBJECT_WRITE) { pgmode |= INV_WRITE; } if (pgmode) { self->fd = lo_open(self->conn->pgconn, self->oid, pgmode); Dprintf("lobject_open: large object opened with mode = %i fd = %d", pgmode, self->fd); if (self->fd == -1) { collect_error(self->conn, &error); retvalue = -1; goto end; } } /* set the mode for future reference */ self->mode = mode; Py_BLOCK_THREADS; self->smode = _lobject_unparse_mode(mode); Py_UNBLOCK_THREADS; if (NULL == self->smode) { retvalue = 1; /* exception already set */ goto end; } retvalue = 0; end: pthread_mutex_unlock(&(self->conn->lock)); Py_END_ALLOW_THREADS; if (retvalue < 0) pq_complete_error(self->conn, &pgres, &error); /* if retvalue > 0, an exception is already set */ return retvalue; }