NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
FPATHCONF(3) Linux Programmer's Manual FPATHCONF(3)
fpathconf, pathconf - get configuration values for files
#include <unistd.h>
long fpathconf(int fd, int name);
long pathconf(char *path, int name);
fpathconf() gets a value for the configuration option name for the open file
descriptor fd.
pathconf() gets a value for configuration option name for the filename path.
The corresponding macros defined in <unistd.h> are minimum values; if an
application wants to take advantage of values which may change, a call to
fpathconf() or pathconf() can be made, which may yield more liberal results.
Setting name equal to one of the following constants returns the following
configuration options:
_PC_LINK_MAX
returns the maximum number of links to the file. If fd or path refer
to a directory, then the value applies to the whole directory. The
corresponding macro is _POSIX_LINK_MAX.
_PC_MAX_CANON
returns the maximum length of a formatted input line, where fd or path
must refer to a terminal. The corresponding macro is _POSIX_MAX_CANON.
_PC_MAX_INPUT
returns the maximum length of an input line, where fd or path must
refer to a terminal. The corresponding macro is _POSIX_MAX_INPUT.
_PC_NAME_MAX
returns the maximum length of a filename in the directory path or fd
that the process is allowed to create. The corresponding macro is
_POSIX_NAME_MAX.
_PC_PATH_MAX
returns the maximum length of a relative pathname when path or fd is
the current working directory. The corresponding macro is
_POSIX_PATH_MAX.
_PC_PIPE_BUF
returns the size of the pipe buffer, where fd must refer to a pipe or
FIFO and path must refer to a FIFO. The corresponding macro is
_POSIX_PIPE_BUF.
_PC_CHOWN_RESTRICTED
returns non-zero if the chown(2) call may not be used on this file. If
fd or path refer to a directory, then this applies to all files in that
directory. The corresponding macro is _POSIX_CHOWN_RESTRICTED.
_PC_NO_TRUNC
returns non-zero if accessing filenames longer than _POSIX_NAME_MAX
generates an error. The corresponding macro is _POSIX_NO_TRUNC.
_PC_VDISABLE
returns non-zero if special character processing can be disabled, where
fd or path must refer to a terminal.
The limit is returned, if one exists. If the system does not have a limit for
the requested resource, -1 is returned, and errno is unchanged. If there is
an error, -1 is returned, and errno is set to reflect the nature of the error.
POSIX.1-2001.
Files with name lengths longer than the value returned for name equal to
_PC_NAME_MAX may exist in the given directory.
Some returned values may be huge; they are not suitable for allocating memory.
getconf(1), open(2), statfs(2), sysconf(3)
This page is part of release 3.23 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 1993-04-04 FPATHCONF(3)