3.9 G 파일을 open 하려고 합니다.

fopen64(3)

fopen64, freopen64
Opens a stream
LIBRARY

Standard C Library (libc.a)

Reentrant Library (libc_r.a)

SYNOPSIS

#include <stdio.h>

FILE *fopen64 (
const char (*path,
const char (*type );

FILE *freopen64 (
const char *path,
const char *type,
FILE *stream );

PARAMETERS

path

Points to a character string that contains the name of the file to be opened. If the final component of the path parameter specifies a symbolic link, the link is traversed and pathname resolution continues.

mode

Points to a character string that has one of the following values:

r or rb
Open file for reading.

w or wb
Truncate to zero length or create file for writing..

a or ab
Append; open or create file for writing at end-of-file.

r+ or rb+ or r+b
Open file for update (reading and writing).

w+ or wb+ pr w+b
Truncate to zero length or create file for update.

a+ or ab+ or a+b
Append; open or create file for update, writing at end-of-file.
The system does not distinguish between text and binary files.

stream

Specifies the input stream.

filedes

Specifies a valid open file descriptor. Note that the largest value that can be represented correctly in an object of type off64_t is established as the offset maximum in the open file description.

DESCRIPTION

The fopen64() function opens the file named by the path parameter and associates a stream with it, returning a pointer to the FILE structure of this stream. Unlike the fopen() function, the fopen64() function is Large File aware, and can access files that are larger than 2GB-1.

When you open a file for update, you can perform both input and output operations on the resulting stream. However, an output operation cannot be directly followed by an input operation without an intervening fflush() function call or a file positioning operation (fseek(), fsetpos64(), or rewind function). Also, an input operation cannot be directly followed by an output operation without an intervening flush or file positioning operation, unless the input operation encounters the end of the file.

When you open a file for append (that is, when the type parameter is a or a+), it is impossible to overwrite information already in the file. You can use the fseek() function to reposition the file pointer to any position in the file, but when output is written to the file, the current file pointer is ignored. All output is written at the end of the file and the file pointer is repositioned to the end of the output.

If two separate processes open the same file for append, each process can write freely to the file without destroying the output being written by the other. The output from the two processes is intermixed in the order in which it is written to the file. Note that if the data is buffered, it is not actually written until it is flushed.

When opened, a stream is fully buffered if and only if it can be determined not to refer to an interactive device. The error and End-of-File indicators for the stream are cleared.

If the type parameter is w, a, w+, or a+ and the file did not previously exist, upon successful completion the fopen64() function marks the st_atime , st_ctime and st_mtime fields of the file and the st_ctime and st_mtime fields of the parent directory for update. If the type parameter is w or w+ and the file did previously exist, upon successful completion the fopen64() function marks the st_ctime and st_mtime fields of the file for update.

The freopen64() function substitutes the named file in place of the open stream. The original stream is closed regardless of whether the open() function succeeds with the named file. The freopen64() function returns a pointer to the FILE structure associated with the stream parameter. The freopen64() function is typically used to attach the preopened streams associated with stdin, stdout, and stderr to other files.

Like fopen64() , freopen64() is Large File Aware, and can access files greater than 2GB-1.

NOTES

POSIX: w and w+ types do not truncate.

The fopen64() and freopen64() functions are supported for element parallel applications; to use a reentrant version, link with libc_r. See f77(1), f90(1) or cc(1) for more information.

AES Support Level:
Full use
RETURN VALUES

If one of these functions fails, it returns a null pointer and may set errno to indicate the error.

ERRORS

fopen64() Function

In case of failure, fopen64() may set errno to one of the following values:

[EACCES]
Search permission is denied on a component of the path prefix, or the file exists and the permissions specified by the type parameter are denied, or the file does not exist and write permission is denied for the parent directory of the file to be created.

[EINTR]
The fopen64() function was interrupted by a signal which was caught.

[EINVAL]
The type parameter is not a valid mode.

[EISDIR]
The named file is a directory and type requires write access.

[ELOOP]
Too many links were encountered in translating path .

[EMFILE]
FOPEN_MAX file descriptors are currently open in the calling process.

[ENAMETOOLONG]
A component of a pathname exceeded PATH_MAX characters; an entire pathname exceeded NAME_MAX characters; or the resolution of a symbolic link exceeded PATH _MAX or NAME_MAX.

[ENFILE]
Too many files are currently open in the system.

[ENOENT]
The named file does not exist or the path parameter points to an empty string.

[ENOSPC]
The directory or file system that would contain the new file cannot be expanded.

[ENOTDIR]
A component of the path prefix is not a directory.

[ENXIO]
The named file is a character special or block special file and the device associated with this special file does not exist.

[EROFS]
The named file resides on a read only file system and type requires write access.

[ETXTBSY]
The requested file is currently opened for writing by some process.
freopen64() Function

The freopen64() function fails if the following is true:

[EACCES]
Search permission is denied on a component of the path prefix, or the file exists and the permissions specified by the type parameter are denied, or the file does not exist and write permission is denied for the parent directory of the file to be created.

[EINTR]
The freopen64() function was interrupted by a signal that was caught.

[EINVAL]
The type parameter is not a valid type.

[EISDIR]
The named file is a directory and type requires write access.

[ELOOP]
Too many symbolic links were encountered in translating path .

[EMFILE]
FOPEN_MAX file descriptors are currently open in the calling process.

[ENAMETOOLONG]
A component of a pathname exceeded PATH_MAX characters; an entire pathname exceeded NAME_MAX characters; or the resolution of a symbolic link exceeded PATH _MAX or NAME_MAX.

[ENFILE]
Too many files are currently open in the system.

[ENOENT]
The named file does not exist or the path parameter points to an empty string.

[ENOSPC]
The directory or file system that would contain the new file cannot be expanded.

[ENOTDIR]
A component of the path prefix is not a directory.

[ENXIO]
The named file is a character special or block special file, and the device associated with this special file does not exist.

[EROFS]
The named file resides on a read only file system and type requires write access.

[ETXTBSY]
The requested file is currently opened for writing by some process.
RELATED INFORMATION

Functions:
open(2), open64(2), fclose(3), fopen(3), fseek(3), setbuf(3)

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Copyright (C) 1990, Open Software Foundation, Inc.