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Add some functions to fd.c for the convenience of extensions.

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For example, if you want to perform an ioctl() on a file descriptor
opened through the fd.c routines, there's no way to do that without
being able to get at the underlying fd.

KaiGai Kohei
This commit is contained in:
Robert Haas 2016-03-08 10:09:50 -05:00
parent 77a1d1e798
commit 070140ee48
2 changed files with 37 additions and 0 deletions
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34
src/backend/storage/file/fd.c
View File

@ -1577,6 +1577,40 @@ FilePathName(File file)
return VfdCache[file].fileName;
}
/*
* Return the raw file descriptor of an opened file.
*
* The returned file descriptor will be valid until the file is closed, but
* there are a lot of things that can make that happen. So the caller should
* be careful not to do much of anything else before it finishes using the
* returned file descriptor.
*/
int
FileGetRawDesc(File file)
{
Assert(FileIsValid(file));
return VfdCache[file].fd;
}
/*
* FileGetRawFlags - returns the file flags on open(2)
*/
int
FileGetRawFlags(File file)
{
Assert(FileIsValid(file));
return VfdCache[file].fileFlags;
}
/*
* FileGetRawMode - returns the mode bitmask passed to open(2)
*/
int
FileGetRawMode(File file)
{
Assert(FileIsValid(file));
return VfdCache[file].fileMode;
}
/*
* Make room for another allocatedDescs[] array entry if needed and possible.

3
src/include/storage/fd.h
View File

@ -75,6 +75,9 @@ extern int FileSync(File file);
extern off_t FileSeek(File file, off_t offset, int whence);
extern int FileTruncate(File file, off_t offset);
extern char *FilePathName(File file);
extern int FileGetRawDesc(File file);
extern int FileGetRawFlags(File file);
extern int FileGetRawMode(File file);
/* Operations that allow use of regular stdio --- USE WITH CAUTION */
extern FILE *AllocateFile(const char *name, const char *mode);