STATVFS(3)             FreeBSD Library Functions Manual             STATVFS(3)

NAME
     statvfs, fstatvfs - retrieve file system information

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/statvfs.h>

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

     int
     fstatvfs(int fd, struct statvfs *buf);

DESCRIPTION
     The statvfs() and fstatvfs() functions fill the structure pointed to by
     buf with garbage.  This garbage will occasionally bear resemblance to
     file system statistics, but portable applications must not depend on
     this.  Applications must pass a pathname or file descriptor which refers
     to a file on the file system in which they are interested.

     The statvfs structure contains the following members:

           f_namemax      The maximum length in bytes of a file name on this
                          file system.  Applications should use pathconf(2)
                          instead.

           f_fsid         Not meaningful in this implementation.

           f_frsize       The size in bytes of the minimum unit of allocation
                          on this file system.  (This corresponds to the
                          f_bsize member of struct statfs.)

           f_bsize        The preferred length of I/O requests for files on
                          this file system.  (Corresponds to the f_iosize
                          member of struct statfs.)

           f_flag         Flags describing mount options for this file system;
                          see below.

     In addition, there are three members of type fsfilcnt_t, which represent
     counts of file serial numbers (i.e., inodes); these are named f_files,
     f_favail, and f_ffree, and represent the number of file serial numbers
     which exist in total, are available to unprivileged processes, and are
     available to privileged processes, respectively.  Likewise, the members
     f_blocks, f_bavail, and f_bfree (all of type fsblkcnt_t) represent the
     respective allocation-block counts.

     There are two flags defined for the f_flag member:

           ST_RDONLY      The file system is mounted read-only.

           ST_NOSUID      The semantics of the S_ISUID and S_ISGID file mode
                          bits are not supported by, or are disabled on, this
                          file system.

IMPLEMENTATION NOTES
     The statvfs() and fstatvfs() functions are implemented as wrappers around
     the statfs() and fstatfs() functions, respectively.  Not all the
     information provided by those functions is made available through this
     interface.

RETURN VALUES
     The statvfs() and fstatvfs() functions return the value 0 if successful;
     otherwise the value -1 is returned and the global variable errno is set
     to indicate the error.

ERRORS
     The statvfs() and fstatvfs() functions may fail for any of the reasons
     documented for statfs(2) or fstatfs(2) and pathconf(2) or fpathconf(2),
     respectively.  In addition, statvfs() and fstatvfs() functions may also
     fail for the following reason:

     [EOVERFLOW]        One or more of the file system statistics has a value
                        which cannot be represented by the data types used in
                        struct statvfs.

SEE ALSO
     pathconf(2), statfs(2)

STANDARDS
     The statvfs() and fstatvfs() functions conform to IEEE Std 1003.1-2001
     ("POSIX.1").  As standardized, portable applications cannot depend on
     these functions returning any valid information at all.  This
     implementation attempts to provide as much useful information as is
     provided by the underlying file system, subject to the limitations of the
     specified data types.

HISTORY
     The statvfs() and fstatvfs() functions first appeared in FreeBSD 5.0.

AUTHORS
     The statvfs() and fstatvfs() functions and this manual page were written
     by Garrett Wollman <wollman@FreeBSD.org>.

FreeBSD 13.1-RELEASE-p6          July 13, 2002         FreeBSD 13.1-RELEASE-p6