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pathconf (2)
  • pathconf (2) ( Solaris man: Системные вызовы )
  • >> pathconf (2) ( FreeBSD man: Системные вызовы )
  • pathconf (3) ( Русские man: Библиотечные вызовы )
  • pathconf (3) ( Linux man: Библиотечные вызовы )
  • pathconf (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    pathconf
    
     
    fpathconf
    
     - get configurable pathname variables
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

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

    DESCRIPTION

    The pathconf ();
    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 (,);
    the Fa path argument is the name of a file or directory. For fpathconf (,);
    the Fa fd argument is an open file descriptor. The Fa name argument specifies the system variable to be queried. Symbolic constants for each name value are found in the include file <unistd.h>

    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
    Return 1 if appropriate privilege is required for the chown(2) system call, otherwise 0. St -p1003.1-2001 requires appropriate privilege in all cases, but this behavior was optional in prior editions of the standard.
    _PC_NO_TRUNC
    Return greater than zero if attempts to use pathname components longer than Br q Dv NAME_MAX will result in an Bq Er ENAMETOOLONG error; otherwise, such components will be truncated to Br q Dv NAME_MAX . St -p1003.1-2001 requires the error in all cases, but this behavior was optional in prior editions of the standard, and some non- POSIX -compliant file systems do not support this behavior.
    _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, otherwise 0.
    _PC_SYNC_IO
    Returns 1 if synchronised I/O is supported for this file, otherwise 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 specified file, otherwise 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.
    _PC_INF_PRESENT
    Returns 1 if an information label can be set on the specified file, otherwise 0.
    _PC_MAC_PRESENT
    Returns 1 if a Mandatory Access Control (MAC) label can be set on the specified file, otherwise 0.
    _PC_MIN_HOLE_SIZE
    If a file system 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 file system does not specify the 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 variable 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.

    Bq Er EINVAL
    The value of the Fa name argument is invalid.
    Bq Er EINVAL
    The implementation does not support an association of the variable name with the associated file.

    The pathconf ();
    system call will fail if:

    Bq Er ENOTDIR
    A component of the path prefix is not a directory.
    Bq Er ENAMETOOLONG
    A component of a pathname exceeded Br q Dv NAME_MAX characters (but see _PC_NO_TRUNC above), or an entire path name exceeded Br q Dv PATH_MAX characters.
    Bq Er ENOENT
    The named file does not exist.
    Bq Er EACCES
    Search permission is denied for a component of the path prefix.
    Bq Er ELOOP
    Too many symbolic links were encountered in translating the pathname.
    Bq Er EIO
    An I/O error occurred while reading from or writing to the file system.

    The fpathconf ();
    system call will fail if:

    Bq Er EBADF
    The Fa fd argument is not a valid open file descriptor.
    Bq Er 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 BSD 4.4


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY


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