fpathconf(2)							   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:

       +---------------------------+------------------------+--------------+
       |	 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 	   |
       +---------------------------+------------------------+--------------+
       |{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 	   |
       +---------------------------+------------------------+--------------+

       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 vari-
	   able 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 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 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 following flags associated with ACL types supported by the file system; otherwise 0 is returned.

	   _ACL_ACE_ENABLED	   The file system supports ACE ACLs.

	   _ACL_ACLENT_ENABLED	   The file system supports UFS aclent ACLs.

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>.

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 existing 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 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 attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       confstr(3C), limits.h(3HEAD), sysconf(3C), attributes(5), standards(5)

SunOS 5.10							    10 Sep 2004 						      fpathconf(2)