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System Calls fpathconf(2)
NAME
fpathconf, pathconf - get configurable pathname variables
SYNOPSIS
#include <unistd.h>
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 <limits.h> or <unistd.h> and the
symbolic constants, defined in <unistd.h>, are the
corresponding values used for name:
SunOS 5.10 Last change: 1 Apr 2005 1
System Calls fpathconf(2)
____________________________________________________________________
| Variable | Value of name | Notes |
|___________________________|________________________|______________|
| {ACL_ENABLED} | _PC_ACL_ENABLED | 10 |
|___________________________|________________________|______________|
| {FILESIZEBITS} | _PC_FILESIZEBITS | 3,4 |
|___________________________|________________________|______________|
| {LINK_MAX} | _PC_LINK_MAX | 1 |
|___________________________|________________________|______________|
| {MAX_CANON} | _PC_MAX_CANON | 2 |
|___________________________|________________________|______________|
| {MAX_INPUT} | _PC_MAX_INPUT | 2 |
|___________________________|________________________|______________|
| {MIN_HOLE_SIZE} | _PC_MIN_HOLE_SIZE | 11 |
|___________________________|________________________|______________|
| {NAME_MAX} | _PC_NAME_MAX | 3, 4 |
|___________________________|________________________|______________|
| {PATH_MAX} | _PC_PATH_MAX | 4,5 |
|___________________________|________________________|______________|
| {PIPE_BUF} | _PC_PIPE_BUF | 6 |
|___________________________|________________________|______________|
| {POSIX_ALLOC_SIZE_MIN} | _PC_ALLOC_SIZE_MIN | |
|___________________________|________________________|______________|
| {POSIX_REC_INCR_XFER_SIZE}| _PC_REC_INCR_XFER_SIZE| |
|___________________________|________________________|______________|
| {POSIX_REC_MAX_XFER_SIZE} | _PC_REC_MAX_XFER_SIZE | |
|___________________________|________________________|______________|
| {POSIX_REC_MIN_XFER_SIZE} | _PC_REC_MIN_XFER_SIZE | |
|___________________________|________________________|______________|
| {POSIX_REC_XFER_ALIGN} | _PC_REC_XFER_ALIGN | |
|___________________________|________________________|______________|
| {SYMLINK_MAX} | _PC_SYMLINK_MAX | 4, 9 |
|___________________________|________________________|______________|
| {XATTR_ENABLED} | _PC_XATTR_ENABLED | 1 |
|___________________________|________________________|______________|
| {XATTR_EXISTS} | _PC_XATTR_EXISTS | 1 |
|___________________________|________________________|______________|
| _POSIX_CHOWN_RESTRICTED | _PC_CHOWN_RESTRICTED | 7 |
|___________________________|________________________|______________|
| _POSIX_NO_TRUNC | _PC_NO_TRUNC | 3, 4 |
|___________________________|________________________|______________|
| _POSIX_VDISABLE | _PC_VDISABLE | 2 |
|___________________________|________________________|______________|
| _POSIX_ASYNC_IO | _PC_ASYNC_IO | 8 |
|___________________________|________________________|______________|
| _POSIX_PRIO_IO | _PC_PRIO_IO | 8 |
|___________________________|________________________|______________|
| _POSIX_SYNC_IO | _PC_SYNC_IO | 8 |
|___________________________|________________________|______________|
SunOS 5.10 Last change: 1 Apr 2005 2
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 asso-
ciation of the variable name with the specified file.
5. If path or fildes refers to a directory, the value
returned is the maximum length of a relative pathname
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 supports 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 directories,
that exist or can be created within the directory.
8. If path or fildes refers to a directory, it is unspeci-
fied 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 sym-
bolic link in that directory can contain.
10.
SunOS 5.10 Last change: 1 Apr 2005 3
System Calls fpathconf(2)
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 following flags associ-
ated with ACL types supported by the file system; other-
wise 0 is returned.
_ACL_ACE_ENABLED The file system supports ACE
ACLs.
_ACL_ACLENT_ENABLED 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 special value of 1 is returned if the filesys-
tem 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 <limits.h> or <unistd.h>.
SunOS 5.10 Last change: 1 Apr 2005 4
System Calls fpathconf(2)
ERRORS
The pathconf() function will fail if:
EINVAL The value of name is not valid.
ELOOP 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:
EACCES 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.
ENAMETOOLONG The length of the path argument exceeds
{PATH_MAX} or a pathname component is longer
than {NAME_MAX}.
ENAMETOOLONG As a result of encountering a symbolic link
in resolution of the path argument, the
length of the substituted pathname string
exceeded {PATH_MAX}.
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.
SunOS 5.10 Last change: 1 Apr 2005 5
System Calls fpathconf(2)
The fpathconf() function may fail if:
EBADF The fildes argument is not a valid file
descriptor.
EINVAL An association of the variable name with the
specified file is not supported.
USAGE
The {SYMLINK_MAX} variable applies only to the fpathconf()
function.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE 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)
SunOS 5.10 Last change: 1 Apr 2005 6
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This page was generated on Wed Sep 12 11:27:04 GMT 2007
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