MirOS Manual: fstatfs(2), statfs(2)

STATFS(2)                  BSD Programmer's Manual                   STATFS(2)


     statfs - get file system statistics


     #include <sys/param.h>
     #include <sys/mount.h>

     statfs(const char *path, struct statfs *buf);

     fstatfs(int fd, struct statfs *buf);


     statfs() returns information about a mounted file system. path is the
     path name of any file within the mounted file system. buf is a pointer to
     a statfs structure defined as follows:

     typedef struct { int32_t val[2]; } fsid_t;

     #define MFSNAMELEN   16 /* length of fs type name, including nul */
     #define MNAMELEN     90 /* length of buffer for returned name */

     struct statfs {
         u_int32_t  f_flags;       /* copy of mount flags */
         int32_t    f_bsize;       /* fundamental file system block size */
         u_int32_t  f_iosize;      /* optimal transfer block size */
         u_int32_t  f_blocks;      /* total data blocks in file system */
         u_int32_t  f_bfree;       /* free blocks in fs */
         int32_t    f_bavail;      /* free blocks avail to non-superuser */
         u_int32_t  f_files;       /* total file nodes in file system */
         u_int32_t  f_ffree;       /* free file nodes in fs */
         fsid_t     f_fsid;        /* file system id */
         uid_t      f_owner;       /* user that mounted the file system */
         u_int32_t  f_syncwrites;  /* count of sync writes since mount */
         u_int32_t  f_asyncwrites; /* count of async writes since mount */
         u_int32_t  f_ctime;       /* last mount [-u] time */
         u_int32_t  f_spare[3];    /* spare for later */
         char       f_fstypename[MFSNAMELEN]; /* fs type name */
         char       f_mntonname[MNAMELEN];    /* directory on which mounted */
         char       f_mntfromname[MNAMELEN];  /* mounted file system */
         union mount_info mount_info;         /* per-filesystem mount options */

     fstatfs() returns the same information about an open file referenced by
     descriptor fd.


     Upon successful completion, a value of 0 is returned. Otherwise, -1 is
     returned and the global variable errno is set to indicate the error.


     statfs() fails if one or more of the following are true:

     [ENOTDIR]     A component of the path prefix of path is not a directory.

                   The length of a component of path exceeds {NAME_MAX} char-
                   acters, or the length of path exceeds {PATH_MAX} charac-

     [ENOENT]      The file referred to by path does not exist.

     [EACCES]      Search permission is denied for a component of the path
                   prefix of path.

     [ELOOP]       Too many symbolic links were encountered in translating

     [EFAULT]      buf or path points to an invalid address.

     [EIO]         An I/O error occurred while reading from or writing to the
                   file system.

     fstatfs() fails if one or more of the following are true:

     [EBADF]       fd is not a valid open file descriptor.

     [EFAULT]      buf points to an invalid address.

     [EIO]         An I/O error occurred while reading from or writing to the
                   file system.


     df(1), mount(2), stat(2)


     The statfs() function first appeared in 4.4BSD.

MirOS BSD #10-current         February 11, 1994                              1

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