July 2002
Beginner to intermediate
96 pages
1h 53m
English
Content preview from Perl Pocket Reference, 4th Edition
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Common constants
Several input/output related constants can be imported from the standard module Fcntl.
Constants related to open and sysopen are imported by default. For some constants, the widely accepted values are shown in octal.
Value | Name | Description |
|---|---|---|
|
| Read-only access. |
|
| Write-only access. |
|
| Read and write access. |
|
| Create the file if nonexistent. |
|
| Fail if the file already exists. |
|
| Append data to the end of the file. |
|
| Truncate the file. |
| Nonblocking input/output. | |
| Same as | |
| Synchronous input/output. | |
| Lock exclusive. | |
| Lock shared. | |
| File must be a directory. | |
| Do not follow symlinks. | |
| Use binary mode for input/output. | |
| Allow file to be larger than 4 GB. | |
| Terminal will not become the controlling tty. |
Constants related to seek and sysseek must be imported explictly by specifying :seek in the import list of Fcntl.
Value | Name | Description |
|---|---|---|
|
| Seek position. |
|
| Seek offset from current position. |
|
| Seek offset from end of file. |
Constants related to flock must be imported explictly by specifying :flock in the import list of Fcntl.
Value | Name | Description |
|---|---|---|
|
| Shared lock. |
|
| Exclusive lock. |
|
| Non-blocking lock. |
|
| Unlock. |
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