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    Command:

    pathconf

    
    
    
    

    SYNOPSIS

         #include <unistd.h>
    
         long
         pathconf(const char *path, int name);
    
         long
         lpathconf(const char *path, int name);
    
         long
         fpathconf(int fd, int name);
    
    
    

    DESCRIPTION

         The pathconf(), lpathconf() and fpathconf() system calls provide a method
         for applications to determine the current value of a configurable system
         limit or option variable associated with a pathname or file descriptor.
    
         For pathconf() and lpathconf(), the path argument is the name of a file
         or directory.  For fpathconf(), the fd argument is an open file descrip-
         tor.  The name argument specifies the system variable to be queried.
         Symbolic constants for each name value are found in the include file
         <unistd.h>.
    
         The lpathconf() system call is like pathconf() except in the case where
         the named file is a symbolic link, in which case lpathconf() returns
         information about the link, while pathconf() returns information about
         the file the link references.
    
         The available values are as follows:
    
         _PC_LINK_MAX
                 The maximum file link count.
    
         _PC_MAX_CANON
                 The maximum number of bytes in terminal canonical input line.
    
         _PC_MAX_INPUT
                 The minimum maximum number of bytes for which space is available
                 in a terminal input queue.
    
         _PC_NAME_MAX
                 The maximum number of bytes in a file name.
    
         _PC_PATH_MAX
                 The maximum number of bytes in a pathname.
    
         _PC_PIPE_BUF
                 The maximum number of bytes which will be written atomically to a
                 pipe.
    
         _PC_CHOWN_RESTRICTED
         _PC_VDISABLE
                 Returns the terminal character disabling value.
    
         _PC_ASYNC_IO
                 Return 1 if asynchronous I/O is supported, otherwise 0.
    
         _PC_PRIO_IO
                 Returns 1 if prioritised I/O is supported for this file, other-
                 wise 0.
    
         _PC_SYNC_IO
                 Returns 1 if synchronised I/O is supported for this file, other-
                 wise 0.
    
         _PC_ALLOC_SIZE_MIN
                 Minimum number of bytes of storage allocated for any portion of a
                 file.
    
         _PC_FILESIZEBITS
                 Number of bits needed to represent the maximum file size.
    
         _PC_REC_INCR_XFER_SIZE
                 Recommended increment for file transfer sizes between
                 _PC_REC_MIN_XFER_SIZE and _PC_REC_MAX_XFER_SIZE.
    
         _PC_REC_MAX_XFER_SIZE
                 Maximum recommended file transfer size.
    
         _PC_REC_MIN_XFER_SIZE
                 Minimum recommended file transfer size.
    
         _PC_REC_XFER_ALIGN
                 Recommended file transfer buffer alignment.
    
         _PC_SYMLINK_MAX
                 Maximum number of bytes in a symbolic link.
    
         _PC_ACL_EXTENDED
                 Returns 1 if an Access Control List (ACL) can be set on the spec-
                 ified file, otherwise 0.
    
         _PC_ACL_NFS4
                 Returns 1 if an NFSv4 ACLs can be set on the specified file, oth-
                 erwise 0.
    
         _PC_ACL_PATH_MAX
                 Maximum number of ACL entries per file.
    
         _PC_CAP_PRESENT
                 Returns 1 if a capability state can be set on the specified file,
                 otherwise 0.
    
                 minimum hole size but still reports holes.
    
    
    

    RETURN VALUES

         If the call to pathconf() or fpathconf() is not successful, -1 is
         returned and errno is set appropriately.  Otherwise, if the variable is
         associated with functionality that does not have a limit in the system,
         -1 is returned and errno is not modified.  Otherwise, the current vari-
         able value is returned.
    
    
    

    ERRORS

         If any of the following conditions occur, the pathconf() and fpathconf()
         system calls shall return -1 and set errno to the corresponding value.
    
         [EINVAL]           The value of the name argument is invalid.
    
         [EINVAL]           The implementation does not support an association of
                            the variable name with the associated file.
    
         The pathconf() system call will fail if:
    
         [ENOTDIR]          A component of the path prefix is not a directory.
    
         [ENAMETOOLONG]     A component of a pathname exceeded {NAME_MAX} charac-
                            ters (but see _PC_NO_TRUNC above), or an entire path
                            name exceeded {PATH_MAX} characters.
    
         [ENOENT]           The named file does not exist.
    
         [EACCES]           Search permission is denied for a component of the
                            path prefix.
    
         [ELOOP]            Too many symbolic links were encountered in translat-
                            ing the pathname.
    
         [EIO]              An I/O error occurred while reading from or writing to
                            the file system.
    
         The fpathconf() system call will fail if:
    
         [EBADF]            The fd argument is not a valid open file descriptor.
    
         [EIO]              An I/O error occurred while reading from or writing to
                            the file system.
    
    
    

    SEE ALSO

         lseek(2), sysctl(3)
    
    
    

    HISTORY

         The pathconf() and fpathconf() system calls first appeared in 4.4BSD.
         The lpathconf() system call first appeared in FreeBSD 8.0.
    
    
    

    BSD July 7, 2009 BSD

    
    
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