Name

SPVM::Sys::IO - IO System Call

Usage

use Sys::IO;

Description

Sys::IO is the class for the file IO.

Class Methods

open

static method open : int ($path : string, $flags : int, $mode : int = 0);

Given a pathname for a file, open() returns a file descriptor, a small, nonnegative integer for use in subsequent system calls (read(2), write(2), lseek(2), fcntl(2), etc.). The file descriptor returned by a successful call will be the lowest-numbered file descriptor not currently open for the process.

See the open function in Linux.

See Sys::IO::Constant about the constant value for the flags and the mode.

read

static method read : int ($fd : int, $buf : mutable string, $count : int, $buf_offset : int = 0);

read() attempts to read up to count bytes from file descriptor fd into the buf starting at buf + buf_offset.

See the read function in Linux.

write

static method write : int ($fd : int, $buf : string, $count : int, $buf_offset : int = 0);

write() writes up to count bytes from the buf pointed buf + buf_offset to the file referred to by the file descriptor fd.

See the write function in Linux.

lseek

static method lseek : long ($fd : int, $offset : long, $whence : int);

The lseek() function repositions the offset of the open file associated with the file descriptor fd to the argument offset according to the directive whence as follows:

See the lseek function in Linux.

See Sys::IO::Constant about the constant value for the whence.

close

static method close : int ($fd : int);

close() closes a file descriptor, so that it no longer refers to any file and may be reused. Any record locks (see fcntl(2)) held on the file it was associated with, and owned by the process, are removed (regardless of the file descriptor that was used to obtain the lock).

See the close function in Linux.

fopen

static method fopen : Sys::IO::FileStream ($path : string, $mode : string);

The fopen() function opens the file whose name is the string pointed to by path and associates a stream with it.

See the fopen function in Linux.

The return value is a Sys::IO::FileStream object.

fdopen

static method fdopen : Sys::IO::FileStream ($fd : int, $mode : string);

The fdopen() function associates a stream with the existing file descriptor, fd. The mode of the stream (one of the values "r", "r+", "w", "w+", "a", "a+") must be compatible with the mode of the file descriptor. The file position indicator of the new stream is set to that belonging to fd, and the error and end-of-file indicators are cleared. Modes "w" or "w+" do not cause truncation of the file. The file descriptor is not dup'ed, and will be closed when the stream created by fdopen() is closed. The result of applying fdopen() to a shared memory object is undefined.

See the fdopen function in Linux.

The return value is a Sys::IO::FileStream object.

fileno

static method fileno : int ($stream : Sys::IO::FileStream);

The function fileno() examines the argument stream and returns its integer descriptor.

See the fileno function in Linux.

The file stream is a Sys::IO::FileStream object.

fread

static method fread : int ($ptr : mutable string, $size : int, $nmemb : int, $stream : Sys::IO::FileStream, $ptr_offset : int = 0);

The function fread() reads nmemb elements of data, each size bytes long, from the stream pointed to by stream, storing them at the location given by ptr + ptr_offset.

See the fread function in Linux.

feof

static method feof : int ($stream : Sys::IO::FileStream);

The function feof() tests the end-of-file indicator for the stream pointed to by stream, returning nonzero if it is set. The end-of-file indicator can only be cleared by the function clearerr().

See the feof function in Linux.

The file stream is a Sys::IO::FileStream object.

ferror

static method ferror : int ($stream : Sys::IO::FileStream);

The function ferror() tests the error indicator for the stream pointed to by stream, returning nonzero if it is set. The error indicator can only be reset by the clearerr() function.

See the ferror function in Linux.

The file stream is a Sys::IO::FileStream object.

clearerr

static method clearerr : void ($stream : Sys::IO::FileStream);

The function clearerr() clears the end-of-file and error indicators for the stream pointed to by stream.

See the clearerr function in Linux.

The file stream is a Sys::IO::FileStream object.

getc

static method getc : int ($stream : Sys::IO::FileStream);

getc() is equivalent to fgetc() except that it may be implemented as a macro which evaluates stream more than once.

See the getc function in Linux.

The file stream is a Sys::IO::FileStream object.

fgets

static method fgets : mutable string ($s : mutable string, $size : int, $stream : Sys::IO::FileStream, $s_offset : int = 0);

fgets() reads in at most one less than size characters from stream and stores them into the buf pointed to by s + s_offset. Reading stops after an EOF or a newline. If a newline is read, it is stored into the buf. A terminating null byte (aq\0aq) is stored after the last character in the buf.

See the fgets function in Linux.

fwrite

static method fwrite : int ($ptr : string, $size : int, $nmemb : int, $stream : Sys::IO::FileStream, $ptr_offset : int = 0);

The function fwrite() writes nmemb elements of data, each size bytes long, to the stream pointed to by stream, obtaining them from the location given by ptr + ptr_offset.

See the fread function in Linux.

The file stream is a Sys::IO::FileStream object.

fseek

static method fseek : int ($stream : Sys::IO::FileStream, $offset : long, $whence : int);

The fseek() function sets the file position indicator for the stream pointed to by stream. The new position, measured in bytes, is obtained by adding offset bytes to the position specified by whence. If whence is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is relative to the start of the file, the current position indicator, or end-of-file, respectively. A successful call to the fseek() function clears the end-of-file indicator for the stream and undoes any effects of the ungetc(3) function on the same stream.

See the fseek function in Linux.

The file stream is a Sys::IO::FileStream object.

See Sys::IO::Constant about the constant value for the whence.

ftell

static method ftell : long ($stream : Sys::IO::FileStream);

The ftell() function obtains the current value of the file position indicator for the stream pointed to by stream.

See the ftell function in Linux.

The file stream is a Sys::IO::FileStream object.

fclose

static method fclose : int ($stream : Sys::IO::FileStream);

The fclose() function flushes the stream pointed to by fp (writing any bufed output data using fflush(3)) and closes the underlying file descriptor.

See the fclose function in Linux.

The file stream is a Sys::IO::FileStream object.

fflush

static method fflush : int ($stream : Sys::IO::FileStream);

For output streams, fflush() forces a write of all user-space bufed data for the given output or update stream via the stream's underlying write function. For input streams, fflush() discards any bufed data that has been fetched from the underlying file, but has not been consumed by the application. The open status of the stream is unaffected.

See the fflush function in Linux.

flock

static method flock : int ($fd : int, $operation : int);

Apply or remove an advisory lock on the open file specified by fd. The argument operation is one of the following:

See the flock function in Linux.

See Sys::IO::Constant about the constant value for the operation.

mkdir

static method mkdir : int ($path : string, $mode : int);

mkdir() attempts to create a directory named pathname.

See the mkdir function in Linux.

See Sys::IO::Constant about the constant value for the mode.

umask

static method umask : int ($mode : int);

umask() sets the calling process's file mode creation mask (umask) to mask & 0777 (i.e., only the file permission bits of mask are used), and returns the previous value of the mask.

See the umask function in Linux.

rmdir

static method rmdir : int ($path : string);

rmdir() deletes a directory, which must be empty.

See the rmdir function in Linux.

unlink

static method unlink : int ($pathname : string);

unlink() deletes a name from the file system. If that name was the last link to a file and no processes have the file open the file is deleted and the space it was using is made available for reuse.

See the unlink function in Linux.

rename

static method rename : int ($oldpath : string, $newpath : string);

rename() renames a file, moving it between directories if required. Any other hard links to the file (as created using link(2)) are unaffected. Open file descriptors for oldpath are also unaffected.

See the rename function in Linux.

getcwd

static method getcwd : mutable string ($buf : mutable string, $size : int);

The getcwd() function copies an absolute pathname of the current working directory to the array pointed to by buf, which is of length size.

See the getcwd function in Linux.

_getdcwd

static method _getdcwd : mutable string ($drive : int, $buffer : mutable string, $maxlen : int);

Gets the full path of the current working directory on the specified drive.

See the _getdcwd function in the case of Windows.

realpath

static method realpath : mutable string ($path : string, $resolved_path : mutable string);

realpath() expands all symbolic links and resolves references to /./, /../ and extra '/' characters in the null-terminated string named by path to produce a canonicalized absolute pathname. The resulting pathname is stored as a null-terminated string, up to a maximum of PATH_MAX bytes, in the buf pointed to by resolved_path. The resulting path will have no symbolic link, /./ or /../ components.

See the realpath function in Linux.

_fullpath

native static method _fullpath : mutable string ($absPath : mutable string, $relPath : string, $maxLength : int);

Creates an absolute or full path name for the specified relative path name.

See the _fullpath function in the case of Windows.

chdir

static method chdir : int ($path : string);

chdir() changes the current working directory of the calling process to the directory specified in path.

See the chdir function in Linux.

chmod

static method chmod : int ($path : string, $mode :int);

chmod() changes the permissions of the file specified whose pathname is given in path, which is dereferenced if it is a symbolic link.

See the chmod function in Linux.

See Sys::IO::Constant about the constant value for the mode.

chown

static method chown : int ($path : string, $owner : int, $group : int);

chown() changes the ownership of the file specified by path, which is dereferenced if it is a symbolic link.

See the chown function in Linux.

truncate

static method truncate : int ($path : string, $length : long);

The truncate() and ftruncate() functions cause the regular file named by path or referenced by fd to be truncated to a size of precisely length bytes.

See the truncate function in Linux.

symlink

static method symlink : int ($oldpath : string, $newpath : string);

symlink() creates a symbolic link named newpath which contains the string oldpath.

See the symlink function in Linux.

readlink

static method readlink : int ($path : string, $buf : mutable string, $bufsiz : int);

readlink() places the contents of the symbolic link path in the buf buf, which has size bufsiz. readlink() does not append a null byte to buf. It will truncate the contents (to a length of bufsiz characters), in case the buf is too small to hold all of the contents.

See the readlink function in Linux.

get_readlink_buffer_size

native static method get_readlink_buffer_size : int ($path : string);

Gets the "readlink" needed buffer size.

opendir

static method opendir : Sys::IO::DirStream ($dir : string);

The opendir() function opens a directory stream corresponding to the directory name, and returns a pointer to the directory stream. The stream is positioned at the first entry in the directory.

See the opendir function in Linux.

The return value is a Sys::IO::DirStream object.

closedir

static method closedir : int ($dirp : Sys::IO::DirStream);

The closedir() function closes the directory stream associated with dirp. A successful call to closedir() also closes the underlying file descriptor associated with dirp. The directory stream descriptor dirp is not available after this call.

See the closedir function in Linux.

The directory stream is a Sys::IO::DirStream object.

readdir

static method readdir : Sys::IO::Dirent ($dirp : Sys::IO::DirStream); # Non-thead safe

The readdir() function returns a pointer to a dirent structure representing the next directory entry in the directory stream pointed to by dirp. It returns NULL on reaching the end of the directory stream or if an error occurred.

See the readdir function in Linux.

The directory stream is a Sys::IO::DirStream object.

The return value is a Sys::IO::Dirent object.

rewinddir

static method rewinddir : void ($dirp : Sys::IO::DirStream);

The rewinddir() function resets the position of the directory stream dirp to the beginning of the directory.

See the rewinddir function in Linux.

The directory stream is a Sys::IO::DirStream object.

telldir

static method telldir : long ($dirp : Sys::IO::DirStream);

The telldir() function returns the current location associated with the directory stream dirp.

See the telldir function in Linux.

The directory stream is a Sys::IO::DirStream object.

seekdir

static method seekdir : void ($dirp : Sys::IO::DirStream, $offset : long);

The seekdir() function sets the location in the directory stream from which the next readdir(2) call will start. seekdir() should be used with an offset returned by telldir(3). See the seekdir function in Linux.

The directory stream is a Sys::IO::DirStream object.

utime

static method utime : int ($filename : string, $times : Sys::IO::Utimbuf);

The utime() system call changes the access and modification times of the inode specified by filename to the actime and modtime fields of times respectively.

See the utime function in Linux.

The buf is a Sys::IO::Utimbuf object.

access_raw

static method access_raw : int ($pathname : string, $mode : int);

The same as "access", but even if the return value is -1, an exception will not be thrown.

access

static method access : int ($pathname : string, $mode : int);

access() checks whether the calling process can access the file pathname. If pathname is a symbolic link, it is dereferenced.

See the access function in Linux.

See Sys::IO::Constant about the constant value for the mode.

eaccess_raw

static method eaccess_raw : int ($pathname : string, $mode : int);

The same as "eaccess", but even if the return value is -1, an exception will not be thrown.

eaccess

static method eaccess : int ($pathname : string, $mode : int);

eaccess() checks whether the calling process can eaccess the file pathname. If pathname is a symbolic link, it is dereferenced.

See the eaccess function in Linux.

See Sys::IO::Constant about the constant value for the $mode.

eaccess_raw

static method eaccess : int ($pathname : string, $mode : int)

The same as "eaccess", but even if the return value is -1, an exception will not be thrown.

eaccess

static method eaccess : int ($pathname : string, $mode : int)

Emulates eaccess using "faccessat".

stat_raw

static method stat_raw : int ($path : string, $stat : Sys::IO::Stat);

The same as "stat", but even if the return value is -1, an exception will not be thrown.

stat

static method stat : int ($path : string, $stat : Sys::IO::Stat);

These functions return information about a file. No permissions are required on the file itself, but-in the case of stat() and lstat() - execute (search) permission is required on all of the directories in path that lead to the file.

stat() stats the file pointed to by path and fills in buf.

See the stat function in Linux.

The stat is Sys::IO::Stat object.

lstat_raw

static method lstat_raw : int ($path : string, $stat : Sys::IO::Stat);

The same as "lstat", but even if the return value is -1, an exception will not be thrown.

lstat

static method lstat : int ($path : string, $stat : Sys::IO::Stat);

lstat() is identical to stat(), except that if path is a symbolic link, then the link itself is stat-ed, not the file that it refers to.

See the lstat function in Linux.

The stat is Sys::IO::Stat object.

fcntl

static method fcntl : int ($fd : int, $command : int, $command_arg : object of Int|Sys::IO::Flock|object = undef);

fcntl() performs one of the operations described below on the open file descriptor fd. The operation is determined by cmd.

See the lstat function in Linux.

The command argument can receive a Sys::IO::Flock object.

ftruncate

static method ftruncate : int ($fd : int, $length : long);

The ftruncate() functions cause the regular file named by referenced by fd to be truncated to a size of precisely length bytes.

See ftruncate(2) - Linux man page in Linux.

ungetc

static method ungetc : int ($c : int, $stream : Sys::IO::FileStream);

ungetc() pushes c back to stream, cast to unsigned char, where it is available for subsequent read operations. Pushed-back characters will be returned in reverse order; only one pushback is guaranteed.

See ungetc(3) - Linux man page in Linux.

fsync

static method fsync : int ($fd : int);

fsync() transfers ("flushes") all modified in-core data of (i.e., modified buffer cache pages for) the file referred to by the file descriptor fd to the disk device (or other permanent storage device) so that all changed information can be retrieved even after the system crashed or was rebooted.

See fsync(2) - Linux man page in Linux.

fstat_raw

static method fstat_raw : int ($fd : int, $stat : Sys::IO::Stat);

The same as "fstat", but even if the return value is -1, an exception will not be thrown.

fstat

static method fstat : int ($fd : int, $stat : Sys::IO::Stat);

fstat() is identical to stat(), except that the file to be stat-ed is specified by the file descriptor fd.

See fstat(2) - Linux man page in Linux.

The $stat is a Sys::IO::Stat object.

freopen

static method freopen : Sys::IO::FileStream ($path : string, $mode : string, $stream : Sys::IO::FileStream);

The freopen() function opens the file whose name is the string pointed to by path and associates the stream pointed to by stream with it.

See freopen(3) - Linux man page in Linux.

setvbuf

static method setvbuf : int ($stream : Sys::IO::FileStream, $buf : mutable string, $mode : int, $size : int);

The setvbuf() function may be used on any open stream to change its buffer.

See setvbuf(3) - Linux man page in Linux.

See Sys::IO::Constant about the constant value for the $mode.

setbuf

static method setbuf : void ($stream : Sys::IO::FileStream, $buf : mutable string);

The same as the following code using "setvbuf".

my $mode : int;
if ($buf) {
  $mode = IO->_IOFBF;
}
else {
  $mode = IO->_IONBF;
}

&setvbuf($stream, $buf, $mode, IO->BUFSIZ);

setbuffer

static method setbuffer : void ($stream : Sys::IO::FileStream, $buf : mutable string, $size : int);

The same as the following code using "setvbuf".

my $mode : int;
if ($buf) {
  $mode = IO->_IOFBF;
}
else {
  $mode = IO->_IONBF;
}

&setvbuf($stream, $buf, $mode, $size);

setlinebuf

static method setlinebuf : void ($stream : Sys::IO::FileStream);

The same as the following code using "setvbuf".

my $mode = IO->_IOLBF;
&setvbuf($stream, undef, $mode, IO->BUFSIZ);

stdin

static method stdin : Sys::IO::FileStream ();

Returns a Sys::IO::FileStream object that has the pointer to the stream that stdin in C language returns.

See stdin(3) - Linux man page in Linux.

stdout

static method stdout : Sys::IO::FileStream ();

Returns a Sys::IO::FileStream object that has the pointer to the stream that stdout in C language returns.

See stdout(3) - Linux man page in Linux.

stderr

static method stderr : Sys::IO::FileStream ();

Returns a Sys::IO::FileStream object that has the pointer to the stream that stderr in C language returns.

See stderr(3) - Linux man page in Linux.

Copyright & License

MIT License

To install SPVM::Sys, copy and paste the appropriate command in to your terminal.

cpanm

cpanm SPVM::Sys

CPAN shell

perl -MCPAN -e shell
install SPVM::Sys

For more information on module installation, please visit the detailed CPAN module installation guide.

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Name

Usage

Description

Class Methods

open

read

write

lseek

close

fopen

fdopen

fileno

fread

feof

ferror

clearerr

getc

fgets

fwrite

fseek

ftell

fclose

fflush

flock

mkdir

umask

rmdir

unlink

rename

getcwd

_getdcwd

realpath

_fullpath

chdir

chmod

chown

truncate

symlink

readlink

get_readlink_buffer_size

opendir

closedir

readdir

rewinddir

telldir

seekdir

utime

access_raw

access

eaccess_raw

eaccess

eaccess_raw

eaccess

stat_raw

stat

lstat_raw

lstat

fcntl

ftruncate

ungetc

fsync

fstat_raw

fstat

freopen

setvbuf

setbuf

setbuffer

setlinebuf

stdin

stdout

stderr

Copyright & License

Module Install Instructions