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glocalfileinfo: Add support for optional/required fields in stat bufs

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This is a step towards supporting `statx()`, which allows the set of
fields it returns to be specified by the caller. Currently, the existing
`stat()` and `fstat()` calls continue to be made, and there are no
behavioural changes — but the new wrapper functions will be extended in
future.

Helps: #1970
This commit is contained in:
Andre Miranda
2020-08-14 15:52:03 +01:00
committed by Philip Withnall
parent 8edbfe8bb0
commit 622806d5cf
4 changed files with 154 additions and 42 deletions
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116
gio/glocalfileinfo.h
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@@ -21,8 +21,11 @@
#ifndef __G_LOCAL_FILE_INFO_H__
#define __G_LOCAL_FILE_INFO_H__
#include <fcntl.h>
#include <gio/gfileinfo.h>
#include <gio/gfile.h>
#include <glib/glib-private.h>
#include <glib/gstdio.h>
#include <glib/gstdioprivate.h>
#include <sys/stat.h>
#include <sys/types.h>
@@ -48,6 +51,119 @@ typedef struct
#define GLocalFileStat struct stat
#endif
/* If the system doesn’t have statx() support, emulate it using traditional
* stat(). It supports fields %G_LOCAL_FILE_STAT_FIELD_BASIC_STATS only, and
* always returns all of them. */
typedef enum
{
G_LOCAL_FILE_STAT_FIELD_TYPE = (1 << 0),
G_LOCAL_FILE_STAT_FIELD_MODE = (1 << 1),
G_LOCAL_FILE_STAT_FIELD_NLINK = (1 << 2),
G_LOCAL_FILE_STAT_FIELD_UID = (1 << 3),
G_LOCAL_FILE_STAT_FIELD_GID = (1 << 4),
G_LOCAL_FILE_STAT_FIELD_ATIME = (1 << 5),
G_LOCAL_FILE_STAT_FIELD_MTIME = (1 << 6),
G_LOCAL_FILE_STAT_FIELD_CTIME = (1 << 7),
G_LOCAL_FILE_STAT_FIELD_INO = (1 << 8),
G_LOCAL_FILE_STAT_FIELD_SIZE = (1 << 9),
G_LOCAL_FILE_STAT_FIELD_BLOCKS = (1 << 10),
G_LOCAL_FILE_STAT_FIELD_BTIME = (1 << 11),
} GLocalFileStatField;
#define G_LOCAL_FILE_STAT_FIELD_BASIC_STATS \
(G_LOCAL_FILE_STAT_FIELD_TYPE | G_LOCAL_FILE_STAT_FIELD_MODE | \
G_LOCAL_FILE_STAT_FIELD_NLINK | G_LOCAL_FILE_STAT_FIELD_UID | \
G_LOCAL_FILE_STAT_FIELD_GID | G_LOCAL_FILE_STAT_FIELD_ATIME | \
G_LOCAL_FILE_STAT_FIELD_MTIME | G_LOCAL_FILE_STAT_FIELD_CTIME | \
G_LOCAL_FILE_STAT_FIELD_INO | G_LOCAL_FILE_STAT_FIELD_SIZE | \
G_LOCAL_FILE_STAT_FIELD_BLOCKS)
#define G_LOCAL_FILE_STAT_FIELD_ALL (G_LOCAL_FILE_STAT_FIELD_BASIC_STATS | G_LOCAL_FILE_STAT_FIELD_BTIME)
static inline int
g_local_file_fstat (int fd,
GLocalFileStatField mask,
GLocalFileStatField mask_required,
GLocalFileStat *stat_buf)
{
if ((G_LOCAL_FILE_STAT_FIELD_BASIC_STATS & (mask_required & mask)) != (mask_required & mask))
{
/* Only G_LOCAL_FILE_STAT_FIELD_BASIC_STATS are supported. */
errno = ERANGE;
return -1;
}
#ifdef G_OS_WIN32
return GLIB_PRIVATE_CALL (g_win32_fstat) (fd, stat_buf);
#else
return fstat (fd, stat_buf);
#endif
}
static inline int
g_local_file_fstatat (int fd,
const char *path,
int flags,
GLocalFileStatField mask,
GLocalFileStatField mask_required,
GLocalFileStat *stat_buf)
{
if ((G_LOCAL_FILE_STAT_FIELD_BASIC_STATS & (mask_required & mask)) != (mask_required & mask))
{
/* Only G_LOCAL_FILE_STAT_FIELD_BASIC_STATS are supported. */
errno = ERANGE;
return -1;
}
#ifdef G_OS_WIN32
/* Currently not supported on Windows */
errno = ENOSYS;
return -1;
#else
return fstatat (fd, path, stat_buf, flags);
#endif
}
static inline int
g_local_file_lstat (const char *path,
GLocalFileStatField mask,
GLocalFileStatField mask_required,
GLocalFileStat *stat_buf)
{
if ((G_LOCAL_FILE_STAT_FIELD_BASIC_STATS & (mask_required & mask)) != (mask_required & mask))
{
/* Only G_LOCAL_FILE_STAT_FIELD_BASIC_STATS are supported. */
errno = ERANGE;
return -1;
}
#ifdef G_OS_WIN32
return GLIB_PRIVATE_CALL (g_win32_lstat_utf8) (path, stat_buf);
#else
return g_lstat (path, stat_buf);
#endif
}
static inline int
g_local_file_stat (const char *path,
GLocalFileStatField mask,
GLocalFileStatField mask_required,
GLocalFileStat *stat_buf)
{
if ((G_LOCAL_FILE_STAT_FIELD_BASIC_STATS & (mask_required & mask)) != (mask_required & mask))
{
/* Only G_LOCAL_FILE_STAT_FIELD_BASIC_STATS are supported. */
errno = ERANGE;
return -1;
}
#ifdef G_OS_WIN32
return GLIB_PRIVATE_CALL (g_win32_stat_utf8) (path, stat_buf);
#else
return stat (path, stat_buf);
#endif
}
inline static gboolean _g_stat_has_field (const GLocalFileStat *buf, GLocalFileStatField field) { return (G_LOCAL_FILE_STAT_FIELD_BASIC_STATS & field) == field; }
#ifndef G_OS_WIN32
inline static mode_t _g_stat_mode (const GLocalFileStat *buf) { return buf->st_mode; }