sys_statvfs.h(0P)	   POSIX Programmer's Manual	     sys_statvfs.h(0P)

PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the corresponding
       Linux manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       sys/statvfs.h — VFS File System information structure

SYNOPSIS
       #include <sys/statvfs.h>

DESCRIPTION
       The <sys/statvfs.h> header shall define the statvfs structure, which
       shall include at least the following members:


	   unsigned long f_bsize    File system block size.
	   unsigned long f_frsize   Fundamental file system block size.
	   fsblkcnt_t	 f_blocks   Total number of blocks on file system in units of f_frsize.
	   fsblkcnt_t	 f_bfree    Total number of free blocks.
	   fsblkcnt_t	 f_bavail   Number of free blocks available to
				    non-privileged process.
	   fsfilcnt_t	 f_files    Total number of file serial numbers.
	   fsfilcnt_t	 f_ffree    Total number of free file serial numbers.
	   fsfilcnt_t	 f_favail   Number of file serial numbers available to
				    non-privileged process.
	   unsigned long f_fsid	    File system ID.
	   unsigned long f_flag	    Bit mask of f_flag values.
	   unsigned long f_namemax  Maximum filename length.

       The <sys/statvfs.h> header shall define the fsblkcnt_t and fsfilcnt_t
       types as described in <sys/types.h>.

       The <sys/statvfs.h> header shall define the following symbolic
       constants for the f_flag member:

       ST_RDONLY   Read-only file system.

       ST_NOSUID   Does not support the semantics of the ST_ISUID and ST_ISGID
		   file mode bits.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.


	   int fstatvfs(int, struct statvfs *);
	   int statvfs(const char *restrict, struct statvfs *restrict);

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <sys_types.h>

       The System Interfaces volume of POSIX.1‐2017, fstatvfs()

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  In the event of any discrepancy between this version and the
       original IEEE and The Open Group Standard, the original IEEE and The
       Open Group Standard is the referee document. The original Standard can
       be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2017		     sys_statvfs.h(0P)