greenplumn file_perm 源码
greenplumn file_perm 代码
文件路径：/src/common/file_perm.c
/*-------------------------------------------------------------------------
*
* File and directory permission routines
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/common/file_perm.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#include "common/file_perm.h"
/* Modes for creating directories and files in the data directory */
int pg_dir_create_mode = PG_DIR_MODE_OWNER;
int pg_file_create_mode = PG_FILE_MODE_OWNER;
/*
* Mode mask to pass to umask(). This is more of a preventative measure since
* all file/directory creates should be performed using the create modes above.
*/
int pg_mode_mask = PG_MODE_MASK_OWNER;
/*
* Set create modes and mask to use when writing to PGDATA based on the data
* directory mode passed. If group read/execute are present in the mode, then
* create modes and mask will be relaxed to allow group read/execute on all
* newly created files and directories.
*/
void
SetDataDirectoryCreatePerm(int dataDirMode)
{
/* If the data directory mode has group access */
if ((PG_DIR_MODE_GROUP & dataDirMode) == PG_DIR_MODE_GROUP)
{
pg_dir_create_mode = PG_DIR_MODE_GROUP;
pg_file_create_mode = PG_FILE_MODE_GROUP;
pg_mode_mask = PG_MODE_MASK_GROUP;
}
/* Else use default permissions */
else
{
pg_dir_create_mode = PG_DIR_MODE_OWNER;
pg_file_create_mode = PG_FILE_MODE_OWNER;
pg_mode_mask = PG_MODE_MASK_OWNER;
}
}
#ifdef FRONTEND
/*
* Get the create modes and mask to use when writing to PGDATA by examining the
* mode of the PGDATA directory and calling SetDataDirectoryCreatePerm().
*
* Errors are not handled here and should be reported by the application when
* false is returned.
*
* Suppress when on Windows, because there may not be proper support for Unix-y
* file permissions.
*/
bool
GetDataDirectoryCreatePerm(const char *dataDir)
{
#if !defined(WIN32) && !defined(__CYGWIN__)
struct stat statBuf;
/*
* If an error occurs getting the mode then return false. The caller is
* responsible for generating an error, if appropriate, indicating that we
* were unable to access the data directory.
*/
if (stat(dataDir, &statBuf) == -1)
return false;
/* Set permissions */
SetDataDirectoryCreatePerm(statBuf.st_mode);
return true;
#else /* !defined(WIN32) && !defined(__CYGWIN__) */
/*
* On Windows, we don't have anything to do here since they don't have
* Unix-y permissions.
*/
return true;
#endif
}
#endif /* FRONTEND */
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