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RAD Studio
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O_xxxx #defines
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RAD Studio
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Header File
fcntl.h
Description
These #defines are bit definitions for a file-access argument.
These RTL file-open functions use some (not all) of these definitions:
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Constant |
Description |
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Read/Write flag |
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O_RDONLY |
Open for reading only |
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O_WRONLY |
Open for writing only |
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O_RDWR |
Open for reading and writing |
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Other access flags |
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O_NDELAY |
Not used; for UNIX compatibility. |
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O_APPEND |
Append to end of file |
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If set, the file pointer is set to the end of the file prior to each write. |
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O_CREAT |
Create and open file |
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If the file already exists, has no effect. |
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If the file does not exist, the file is created. |
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O_EXCL |
Exclusive open: Used only with O_CREAT. |
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If the file already exists, an error is returned. |
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O_TRUNC |
Open with truncation |
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If the file already exists, its length is truncated to 0. The file attributes remain unchanged. |
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Binary-mode/Text-mode flags |
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O_BINARY |
No translation: Explicitly opens the file in binary mode |
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O_TEXT |
CR-LF translation: Explicitly opens the file in text mode |
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Additional values available using _rtl_open |
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O_NOINHERIT |
Child processes inherit file |
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O_DENYALL |
Error if opened for read/write |
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O_DENYWRITE |
Error if opened for write |
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O_DENYREAD |
Error if opened for read |
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O_DENYNONE |
Allow concurrent access |
Note: Only one of the O_DENYxxx options can be included in a single open. These file-sharing attributes are in addition to any locking performed on the files.
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Do not modify |
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O_CHANGED |
Special DOS read-only bit |
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O_DEVICE |
Special DOS read-only bit |
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Copyright(C) 2009 Embarcadero Technologies, Inc. All Rights Reserved.
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