GNU/Linux man pages
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GNU/Linux |
CentOS 5.4 |
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FileCache(3pm) |
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FileCache − keep more files open than the system permits
use FileCache;
# or
use FileCache maxopen => 16;
cacheout $mode, $path;
# or
cacheout $path;
print $path @data;
$fh = cacheout $mode, $path;
# or
$fh = cacheout $path;
print $fh @data;
The
"cacheout" function will make sure that
there’s a filehandle open for reading or writing
available as the pathname you give it. It automatically
closes and re-opens files if you exceed your system’s
maximum number of file descriptors, or the suggested maximum
maxopen.
cacheout EXPR
The 1−argument form of cacheout will open a file for writing ('>') on it’s first use, and appending ('>>') thereafter.
Returns EXPR on success for convenience. You may neglect the return value and manipulate EXPR as the filehandle directly if you prefer.
cacheout MODE , EXPR
The 2−argument form of cacheout will use the supplied mode for the initial and subsequent openings. Most valid modes for 3−argument "open" are supported namely; '>', '+>', '<', '<+', '>>', '⎪−' and '−⎪'
To pass supplemental arguments to a program opened with '⎪−' or '−⎪' append them to the command string as you would system EXPR .
Returns EXPR on success for convenience. You may neglect the return value and manipulate EXPR as the filehandle directly if you prefer.
While it is permissible to "close" a FileCache managed file, do not do so if you are calling "FileCache::cacheout" from a package other than which it was imported, or with another module which overrides "close". If you must, use "FileCache::cacheout_close".
Although FileCache can be used with piped opens (’−⎪’ or ’⎪−’) doing so is strongly discouraged. If FileCache finds it necessary to close and then reopen a pipe, the command at the far end of the pipe will be reexecuted − the results of performing IO on FileCache’d pipes is unlikely to be what you expect. The ability to use FileCache on pipes may be removed in a future release.
FileCache does not store the current file offset if it finds it necessary to close a file. When the file is reopened, the offset will be as specified by the original "open" file mode. This could be construed to be a bug.
sys/param.h lies with its "NOFILE" define on some systems, so you may have to set maxopen yourself.
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FileCache(3pm) | |