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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man3/fpathconf.3
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-'\" t
-.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
-.\" and Copyright (C) 2017 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified Wed Jul 28 11:12:26 1993 by Rik Faith (faith@cs.unc.edu)
-.\"
-.\" FIXME Probably all of the following should be documented:
-.\" _PC_SYNC_IO,
-.\" _PC_ASYNC_IO,
-.\" _PC_PRIO_IO,
-.\" _PC_SOCK_MAXBUF,
-.\" _PC_FILESIZEBITS,
-.\" _PC_REC_INCR_XFER_SIZE,
-.\" _PC_REC_MAX_XFER_SIZE,
-.\" _PC_REC_MIN_XFER_SIZE,
-.\" _PC_REC_XFER_ALIGN,
-.\" _PC_ALLOC_SIZE_MIN,
-.\" _PC_SYMLINK_MAX,
-.\" _PC_2_SYMLINKS
-.\"
-.TH fpathconf 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-fpathconf, pathconf \- get configuration values for files
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "long fpathconf(int " fd ", int " name );
-.BI "long pathconf(const char *" path ", int " name );
-.fi
-.SH DESCRIPTION
-.BR fpathconf ()
-gets a value for the configuration option
-.I name
-for the open file descriptor
-.IR fd .
-.P
-.BR pathconf ()
-gets a value for configuration option
-.I name
-for the filename
-.IR path .
-.P
-The corresponding macros defined in
-.I <unistd.h>
-are minimum values; if an application wants to take advantage of values
-which may change, a call to
-.BR fpathconf ()
-or
-.BR pathconf ()
-can be made, which may yield more liberal results.
-.P
-Setting
-.I name
-equal to one of the following constants returns the following
-configuration options:
-.TP
-.B _PC_LINK_MAX
-The maximum number of links to the file.
-If
-.I fd
-or
-.I path
-refer to a directory, then the value applies to the whole directory.
-The corresponding macro is
-.BR _POSIX_LINK_MAX .
-.TP
-.B _PC_MAX_CANON
-The maximum length of a formatted input line, where
-.I fd
-or
-.I path
-must refer to a terminal.
-The corresponding macro is
-.BR _POSIX_MAX_CANON .
-.TP
-.B _PC_MAX_INPUT
-The maximum length of an input line, where
-.I fd
-or
-.I path
-must refer to a terminal.
-The corresponding macro is
-.BR _POSIX_MAX_INPUT .
-.TP
-.B _PC_NAME_MAX
-The maximum length of a filename in the directory
-.I path
-or
-.I fd
-that the process is allowed to create.
-The corresponding macro is
-.BR _POSIX_NAME_MAX .
-.TP
-.B _PC_PATH_MAX
-The maximum length of a relative pathname when
-.I path
-or
-.I fd
-is the current working directory.
-The corresponding macro is
-.BR _POSIX_PATH_MAX .
-.TP
-.B _PC_PIPE_BUF
-The maximum number of bytes that can be written atomically to a pipe of FIFO.
-For
-.BR fpathconf (),
-.I fd
-should refer to a pipe or FIFO.
-For
-.BR fpathconf (),
-.I path
-should refer to a FIFO or a directory; in the latter case,
-the returned value corresponds to FIFOs created in that directory.
-The corresponding macro is
-.BR _POSIX_PIPE_BUF .
-.TP
-.B _PC_CHOWN_RESTRICTED
-This returns a positive value if the use of
-.BR chown (2)
-and
-.BR fchown (2)
-for changing a file's user ID is restricted to a process
-with appropriate privileges,
-and changing a file's group ID to a value other than the process's
-effective group ID or one of its supplementary group IDs
-is restricted to a process with appropriate privileges.
-According to POSIX.1,
-this variable shall always be defined with a value other than \-1.
-The corresponding macro is
-.BR _POSIX_CHOWN_RESTRICTED .
-.IP
-If
-.I fd
-or
-.I path
-refers to a directory,
-then the return value applies to all files in that directory.
-.TP
-.B _PC_NO_TRUNC
-This returns nonzero if accessing filenames longer than
-.B _POSIX_NAME_MAX
-generates an error.
-The corresponding macro is
-.BR _POSIX_NO_TRUNC .
-.TP
-.B _PC_VDISABLE
-This returns nonzero if special character processing can be disabled, where
-.I fd
-or
-.I path
-must refer to a terminal.
-.SH RETURN VALUE
-The return value of these functions is one of the following:
-.IP \[bu] 3
-On error, \-1 is returned and
-.I errno
-is set to indicate the error
-(for example,
-.BR EINVAL ,
-indicating that
-.I name
-is invalid).
-.IP \[bu]
-If
-.I name
-corresponds to a maximum or minimum limit, and that limit is indeterminate,
-\-1 is returned and
-.I errno
-is not changed.
-(To distinguish an indeterminate limit from an error, set
-.I errno
-to zero before the call, and then check whether
-.I errno
-is nonzero when \-1 is returned.)
-.IP \[bu]
-If
-.I name
-corresponds to an option,
-a positive value is returned if the option is supported,
-and \-1 is returned if the option is not supported.
-.IP \[bu]
-Otherwise,
-the current value of the option or limit is returned.
-This value will not be more restrictive than
-the corresponding value that was described to the application in
-.I <unistd.h>
-or
-.I <limits.h>
-when the application was compiled.
-.SH ERRORS
-.TP
-.B EACCES
-.RB ( pathconf ())
-Search permission is denied for one of the directories in the path prefix of
-.IR path .
-.TP
-.B EBADF
-.RB ( fpathconf ())
-.I fd
-is not a valid file descriptor.
-.TP
-.B EINVAL
-.I name
-is invalid.
-.TP
-.B EINVAL
-The implementation does not support an association of
-.I name
-with the specified file.
-.TP
-.B ELOOP
-.RB ( pathconf ())
-Too many symbolic links were encountered while resolving
-.IR path .
-.TP
-.B ENAMETOOLONG
-.RB ( pathconf ())
-.I path
-is too long.
-.TP
-.B ENOENT
-.RB ( pathconf ())
-A component of
-.I path
-does not exist, or
-.I path
-is an empty string.
-.TP
-.B ENOTDIR
-.RB ( pathconf ())
-A component used as a directory in
-.I path
-is not in fact a directory.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR fpathconf (),
-.BR pathconf ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH NOTES
-Files with name lengths longer than the value returned for
-.I name
-equal to
-.B _PC_NAME_MAX
-may exist in the given directory.
-.P
-Some returned values may be huge; they are not suitable for allocating
-memory.
-.SH SEE ALSO
-.BR getconf (1),
-.BR open (2),
-.BR statfs (2),
-.BR confstr (3),
-.BR sysconf (3)