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 .