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FPATHCONF(3) Linux Programmer's Manual FPATHCONF(3)
NAME
fpathconf, pathconf - get configuration values for files
SYNOPSIS
#include <unistd.h>
long fpathconf(int fd, int name);
long pathconf(const char *path, int name);
DESCRIPTION
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 direc‐
tory, 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 ter‐
minal. 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 nonzero 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 corre‐
sponding macro is _POSIX_CHOWN_RESTRICTED.
_PC_NO_TRUNC
returns nonzero if accessing filenames longer than _POSIX_NAME_MAX generates an
error. The corresponding macro is _POSIX_NO_TRUNC.
_PC_VDISABLE
returns nonzero if special character processing can be disabled, where fd or path
must refer to a terminal.
RETURN VALUE
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.
CONFORMING TO
POSIX.1-2001.
NOTES
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.
SEE ALSO
getconf(1), open(2), statfs(2), confstr(3), sysconf(3)
COLOPHON
This page is part of release 3.74 of the Linux man-pages project. A description of the
project, information about reporting bugs, and the latest version of this page, can be
found at http://www.kernel.org/doc/man-pages/.
GNU 2014-05-28 FPATHCONF(3)
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