getfsstat(2) [bsd man page]

GETFSSTAT(2)							System Calls Manual						      GETFSSTAT(2)

NAME

       getfsstat - get list of all mounted filesystems

SYNOPSIS

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

       int
       getfsstat(buf,bufsize,flags)
       struct statfs *buf;
       int bufsize;
       int flags;

DESCRIPTION

       Getfsstat() returns information about all mounted filesystems.  Buf is a pointer to statfs structures defined as follows:

       #define MNAMELEN 90	 /* length of buffer for returned name */

       struct statfs {
       short   f_type;		 /* type of filesystem (see below) */
       short   f_flags; 	 /* copy of mount flags */
       short   f_bsize; 	 /* fundamental file system block size */
       short   f_iosize;	 /* optimal transfer block size */
       long    f_blocks;	 /* total data blocks in file system */
       long    f_bfree; 	 /* free blocks in fs */
       long    f_bavail;	 /* free blocks avail to non-superuser */
       ino_t   f_files; 	 /* total file nodes in file system */
       ino_t   f_ffree; 	 /* free file nodes in fs */
       u_long  f_fsid[2];	 /* file system id */
       long    f_spare[4];	 /* spare for later */
       char    f_mntonname[MNAMELEN];	 /* mount point */
       char    f_mntfromname[MNAMELEN];  /* mounted filesystem */
       };
       /*
       * File system types. - Only UFS is supported so the other types are not
       * given.
       */
       #define	 MOUNT_NONE	0
       #define	 MOUNT_UFS 1	/* Fast Filesystem */

       Fields that are undefined for a particular filesystem are set to -1.  The buffer is filled with an array of fsstat structures, one for each
       mounted filesystem up to the size specified by bufsize.

       If buf is given as NULL, getfsstat() returns just the number of mounted filesystems.

       Normally flags is currently unused.  In 4.4BSD systems the usage is specified as MNT_WAIT.  If flags is set to MNT_NOWAIT, getfsstat() will
       return  the  information  it has available without requesting an update from each filesystem.  Thus, some of the information will be out of
       date, but getfsstat() will not block waiting for information from a filesystem that is unable to respond.

RETURN VALUES

       Upon successful completion, the number of fsstat structures is returned.  Otherwise, -1 is returned and the global variable errno is set to
       indicate the error.

ERRORS

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

       [EFAULT] 	   Buf points to an invalid address.

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

SEE ALSO

       statfs(2), fstab(5), mount(8)

HISTORY

       The getfsstat function first appeared in 4.4BSD.

4.4 Berkeley Distribution					 December 24, 1995						      GETFSSTAT(2)

STATFS(2)						      BSD System Calls Manual							 STATFS(2)

NAME

     statfs -- get file system statistics

SYNOPSIS

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

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

     int
     fstatfs(int fd, struct statfs *buf);

DESCRIPTION

     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   15 /* length of fs type name, not inc. nul */
     #define MNAMELEN	  90 /* length of buffer for returned name */

     struct statfs {
	 short	 f_otype;    /* type of file system (reserved: zero) */
	 short	 f_oflags;   /* copy of mount flags (reserved: zero) */
	 long	 f_bsize;    /* fundamental file system block size */
	 long	 f_iosize;   /* optimal transfer block size */
	 long	 f_blocks;   /* total data blocks in file system */
	 long	 f_bfree;    /* free blocks in fs */
	 long	 f_bavail;   /* free blocks avail to non-superuser */
	 long	 f_files;    /* total file nodes in file system */
	 long	 f_ffree;    /* free file nodes in fs */
	 fsid_t  f_fsid;     /* file system id (super-user only) */
	 uid_t	 f_owner;    /* user that mounted the file system */
	 short	 f_reserved1;	     /* reserved for future use */
	 short	 f_type;     /* type of file system (reserved) */
	 long	 f_flags;    /* copy of mount flags (reserved) */
	 long	 f_reserved2[2];     /* reserved for future use */
	 char	 f_fstypename[MFSNAMELEN]; /* fs type name */
	 char	 f_mntonname[MNAMELEN];    /* directory on which mounted */
	 char	 f_mntfromname[MNAMELEN];  /* mounted file system */
	 char	 f_reserved3;	     /* reserved for future use */
	 long	 f_reserved4[4];     /* reserved for future use */
     };

     Fields that are undefined for a particular file system are set to -1.  Fstatfs() returns the same information about an open file referenced
     by descriptor fd.

RETURN VALUES

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

ERRORS

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

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

     [ENAMETOOLONG]	The length of a component of path exceeds {NAME_MAX} characters, or the length of path exceeds {PATH_MAX} characters.

     [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 path.

     [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.

HISTORY

     The statfs() function first appeared in 4.4BSD.

BSD
								 February 11, 1994							       BSD