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

       fstatvfs, statvfs — get file system information

SYNOPSIS

       #include <sys/statvfs.h>

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

DESCRIPTION

       The  fstatvfs() function shall obtain information about the file system containing the file referenced by
       fildes.

       The statvfs() function shall obtain information about the file system containing the file named by path.

       For both functions, the buf argument is a pointer to a statvfs structure  that  shall  be  filled.  Read,
       write, or execute permission of the named file is not required.

       The following flags can be returned in the f_flag member:

       ST_RDONLY   Read-only file system.

       ST_NOSUID   Setuid/setgid bits ignored by exec.

       It  is  unspecified  whether  all  members  of  the  statvfs structure have meaningful values on all file
       systems.

RETURN VALUE

       Upon successful completion, statvfs() shall return 0. Otherwise, it shall return  -1  and  set  errno  to
       indicate the error.

ERRORS

       The fstatvfs() and statvfs() functions shall fail if:

       EIO    An I/O error occurred while reading the file system.

       EINTR  A signal was caught during execution of the function.

       EOVERFLOW
              One  of  the  values to be returned cannot be represented correctly in the structure pointed to by
              buf.

       The fstatvfs() function shall fail if:

       EBADF  The fildes argument is not an open file descriptor.

       The statvfs() function shall fail if:

       EACCES Search permission is denied on a component of the path prefix.

       ELOOP  A loop exists in symbolic links encountered during resolution of the path argument.

       ENAMETOOLONG
              The length of a component of a pathname is longer than {NAME_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 names an existing file that is neither a directory nor  a  symbolic
              link  to  a  directory,  or the path argument contains at least one non-<slash> character and ends
              with one or more trailing <slash> characters and the last pathname  component  names  an  existing
              file that is neither a directory nor a symbolic link to a directory.

       The statvfs() function may fail if:

       ELOOP  More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the path argument.

       ENAMETOOLONG
              The length of a pathname exceeds {PATH_MAX}, or pathname resolution of a symbolic link produced an
              intermediate result with a length that exceeds {PATH_MAX}.

       The following sections are informative.

EXAMPLES

   Obtaining File System Information Using fstatvfs()
       The following example shows how to obtain file system information for the file system upon which the file
       named  /home/cnd/mod1  resides,  using  the  fstatvfs()  function. The /home/cnd/mod1 file is opened with
       read/write privileges and the open file descriptor is passed to the fstatvfs() function.

           #include <sys/statvfs.h>
           #include <fcntl.h>

           struct statvfs buffer;
           int            status;
           ...
           fildes = open("/home/cnd/mod1", O_RDWR);
           status  = fstatvfs(fildes, &buffer);

   Obtaining File System Information Using statvfs()
       The following example shows how to obtain file system information for the file system upon which the file
       named /home/cnd/mod1 resides, using the statvfs() function.

           #include <sys/statvfs.h>

           struct statvfs buffer;
           int            status;
           ...
           status = statvfs("/home/cnd/mod1", &buffer);

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       chmod(), chown(), creat(), dup(),  exec,  fcntl(),  link(),  mknod(),  open(),  pipe(),  read(),  time(),
       unlink(), utime(), write()

       The Base Definitions volume of POSIX.1‐2017, <sys_statvfs.h>

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                                      FSTATVFS(3POSIX)