diff options
Diffstat (limited to 'src/include/storage/fd.h')
| -rw-r--r-- | src/include/storage/fd.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/src/include/storage/fd.h b/src/include/storage/fd.h index 51e2ece3c9d..2085c62b41d 100644 --- a/src/include/storage/fd.h +++ b/src/include/storage/fd.h @@ -35,6 +35,10 @@ * Likewise, use AllocateDir/FreeDir, not opendir/closedir, to allocate * open directories (DIR*), and OpenTransientFile/CloseTransientFile for an * unbuffered file descriptor. + * + * If you really can't use any of the above, at least call AcquireExternalFD + * or ReserveExternalFD to report any file descriptors that are held for any + * length of time. Failure to do so risks unnecessary EMFILE errors. */ #ifndef FD_H #define FD_H @@ -120,7 +124,12 @@ extern int CloseTransientFile(int fd); extern int BasicOpenFile(const char *fileName, int fileFlags); extern int BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode); - /* Make a directory with default permissions */ +/* Use these for other cases, and also for long-lived BasicOpenFile FDs */ +extern bool AcquireExternalFD(void); +extern void ReserveExternalFD(void); +extern void ReleaseExternalFD(void); + +/* Make a directory with default permissions */ extern int MakePGDirectory(const char *directoryName); /* Miscellaneous support routines */ |