<TITLE>pathconf</TITLE>
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<h3>FPATHCONF(3) Linux Programmer's Manual FPATHCONF(3)
</h3>
<h3>NAME
</h3> fpathconf, pathconf - get configuration values for files
<h3>SYNOPSIS
</h3> #include <unistd.h>
long fpathconf(int filedes, int name);
long pathconf(char *path, int name);
<h3>DESCRIPTION
</h3> fpathconf() gets a value for the configuration option name
for the open file descriptor filedes.
pathconf() gets a value for configuration option name for
the file name path.
The corresponding macros defined in <unistd.h> minimum
values; if an application wants to take advantage of val-
ues 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 filedes or path refer to a directory, then the
value applies to the whole directory. The corre-
sponding macro is _POSIX_LINK_MAX.
_PC_MAX_CANON
returns the maximum length of a formatted input
line, where filedes or path must refer to a termi-
nal. The corresponding macro is _POSIX_MAX_CANON.
_PC_MAX_INPUT
returns the maximum length of an input line, where
filedes or path must refer to a terminal. The cor-
responding macro is _POSIX_MAX_INPUT.
_PC_NAME_MAX
returns the maximum length of a filename in the
directory path or filedes. the process is allowed
to create. _POSIX_MAX_.
_PC_PATH_MAX
returns the maximum length of a relative pathname
when path or filedes is the current working direc-
tory. The corresponding macro is _POSIX_PATH_MAX.
_PC_PIPE_BUF
returns the size of the pipe buffer, where filedes
must refer to a pipe or FIFO and path must refer to
a FIFO. The corresponding macro is _POSIX_PIPE_BUF.
<h3>GNU April 4, 1993 1
</h3>
<h3>FPATHCONF(3) Linux Programmer's Manual FPATHCONF(3)
</h3>
_PC_CHOWN_RESTRICTED
returns nonzero if the chown(2) call may not be
used on this file. If filedes 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 nonzero if accessing filenames longer than
_POSIX_NAME_MAX generates an error. The corre-
sponding macro is _POSIX_NO_TRUNC.
_PC_VDISABLE
returns nonzero if special character processing can
be disabled, where filedes or path must refer to a
terminal.
<h3>RETURN VALUE
</h3> 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.
<h3>CONFORMS TO
</h3> POSIX.1 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.
</pre>
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<h3>SEE ALSO
</h3><p>
<a href=getconf.htm>getconf</a>,
<a href=statfs.htm>statfs</a>,
<a href=open.htm>open</a>,
<a href=sysconf.htm>sysconf</a>,
<pre>
<h3>GNU April 4, 1993 2
</h3>
</pre>
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