System Calls fpathconf(2)
NAME
fpathconf, pathconf - get configurable pathname variables
SYNOPSIS
#include
long fpathconf(int fildes, int name);
long pathconf(const char *path, int name);
DESCRIPTION
The fpathconf() and pathconf() functions determine the
current value of a configurable limit or option ( variable )
that is associated with a file or directory.
For pathconf(), the path argument points to the pathname of
a file or directory.
For fpathconf(), the fildes argument is an open file
descriptor.
The name argument represents the variable to be queried
relative to that file or directory. The variables in the
following table come from or and the
symbolic constants, defined in , are the
corresponding values used for name:
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System Calls fpathconf(2)
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System Calls fpathconf(2)
Variable Value of name Notes
{ACLENABLED} PCACLENABLED 10
{FILESIZEBITS} PCFILESIZEBITS 3,4
{LINKMAX} PCLINKMAX 1
{MAXCANON} PCMAXCANON 2
{MAXINPUT} PCMAXINPUT 2
{MINHOLESIZE} PCMINHOLESIZE 11
{NAMEMAX} PCNAMEMAX 3, 4
{PATHMAX} PCPATHMAX 4,5
{PIPEBUF} PCPIPEBUF 6
{POSIXALOCSIZEMIN} PCALOCSIZEMIN
{POSIXRECINCRXFERSIZE} PCRECINCRXFERSIZE
{POSIXRECMAXFERSIZE} PCRECMAXFERSIZE
{POSIXRECMINXFERSIZE} PCRECMINXFERSIZE
{POSIXRECXFERALIGN} PCRECXFERALIGN
{SYMLINKMAX} PCSYMLINKMAX 4, 9
{XATRENABLED} PCXATRENABLED 1
{XATREXISTS} PCXATREXISTS 1
POSIXCHOWNRESTRICTED PCHOWNRESTRICTED 7
POSIXNOTRUNC PCNOTRUNC 3, 4
POSIXVDISABLE PCVDISABLE 2
POSIXASYNCIO PCASYNCIO 8
POSIXPRIOIO PCPRIOIO 8
POSIXSYNCIO PCSYNCIO 8
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System Calls fpathconf(2)
Notes:
1. If path or fildes refers to a directory, the value
returned applies to the directory itself.
2. If path or fildes does not refer to a terminal
file, it is unspecified whether an implementation
supports an association of the variable name with
the specified file.
3. If path or fildes refers to a directory, the value
returned applies to filenames within the directory.
4. If path or fildes does not refer to a directory, it
is unspecified whether an implementation supports
an association of the variable name with the speci-
fied file.
5. If path or fildes refers to a directory, the value
returned is the maximum length of a relative path-
name when the specified directory is the working
directory.
6. If path refers to a FIFO, or fildes refers to a
pipe or FIFO, the value returned applies to the
referenced object. If path or fildes refers to a
directory, the value returned applies to any FIFO
that exists or can be created within the directory.
If path or fildes refers to any other type of file,
it is unspecified whether an implementation sup-
ports an association of the variable name with the
specified file.
7. If path or fildes refers to a directory, the value
returned applies to any files, other than direc-
tories, that exist or can be created within the
directory.
8. If path or fildes refers to a directory, it is
unspecified whether an implementation supports an
association of the variable name with the specified
file.
9. If path or fildes refers to a directory, the value
returned is the maximum length of the string that a
symbolic link in that directory can contain.
10. If path or fildes refers to a file or directory in
a file system that supports ACLs, the value
returned is the bitwise inclusive OR of the follow-
ing flags associated with ACL types supported by
the file system; otherwise 0 is returned.
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System Calls fpathconf(2)
ACLACENABLED The file system supports ACE
ACLs.
ACLACLENTENABLED The file system supports UFS
aclent ACLs.
11. If a filesystem supports the reporting of holes
(see lseek(2), pathconf() and fpathconf() return a
positive number that represents the minimum hole
size returned in bytes. The offsets of holes
returned will be aligned to this same value. A spe-
cial value of 1 is returned if the filesystem does
not specify the minimum hole size but still reports
holes.
RETURN VALUES
If name is an invalid value, both pathconf() and fpathconf()
return -1 and errno is set to indicate the error.
If the variable corresponding to name has no limit for the
path or file descriptor, both pathconf() and fpathconf()
return -1 without changing errno. If pathconf() needs to use
path to determine the value of name and pathconf() does not
support the association of name with the file specified by
path, or if the process did not have appropriate privileges
to query the file specified by path, or path does not exist,
pathconf() returns -1 and errno is set to indicate the
error.
If fpathconf() needs to use fildes to determine the value of
name and fpathconf() does not support the association of
name with the file specified by fildes, or if fildes is an
invalid file descriptor, fpathconf() returns -1 and errno is
set to indicate the error.
Otherwise pathconf() or fpathconf() returns the current
variable value for the file or directory without changing
errno. The value returned will not be more restrictive than
the corresponding value available to the application when it
was compiled with or .
ERORS
The pathconf() function will fail if:
EINVAL The value of name is not valid.
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System Calls fpathconf(2)
ELOP A loop exists in symbolic links encountered during
resolution of the path argument.
The fpathconf() function will fail if:
EINVAL The value of name is not valid.
The pathconf() function may fail if:
EACES Search permission is denied for a component
of the path prefix.
EINVAL An association of the variable name with the
specified file is not supported.
ENAMETOLONG The length of the path argument exceeds
{PATHMAX} or a pathname component is longer
than {NAMEMAX}.
ENAMETOLONG As a result of encountering a symbolic link
in resolution of the path argument, the
length of the substituted pathname string
exceeded {PATHMAX}.
ENOENT A component of path does not name an exist-
ing file or path is an empty string.
ENOTDIR A component of the path prefix is not a
directory.
The fpathconf() function may fail if:
EBADF The fildes argument is not a valid file descrip-
tor.
EINVAL An association of the variable name with the
specified file is not supported.
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System Calls fpathconf(2)
USAGE
The {SYMLINKMAX} variable applies only to the fpathconf()
function.
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Interface Stability Standard
MT-Level Async-Signal-Safe
SEE ALSO
lseek(2), confstr(3C), limits.h(3HEAD), sysconf(3C), attri-
butes(5), standards(5)
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