GETFSSTAT(2) BSD System Calls Manual GETFSSTAT(2)

NAME
     ggeettffssssttaatt - get list of all mounted file systems

SYNOPSIS
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     ##iinncclluuddee <>
     ##iinncclluuddee <>

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

DESCRIPTION
     GGeettffssssttaatt() returns information about all mounted file systems.  Buf is a
     pointer to an array of statfs structures defined as follows:

     typedef struct { int32t val[2]; } fsidt;

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

     struct statfs {
         short   fotype;    /* type of file system (reserved: zero) */
         short   foflags;   /* copy of mount flags (reserved: zero) */
         long    fbsize;    /* fundamental file system block size */
         long    fiosize;   /* optimal transfer block size */
         long    fblocks;   /* total data blocks in file system */
         long    fbfree;    /* free blocks in fs */
         long    fbavail;   /* free blocks avail to non-superuser */
         long    ffiles;    /* total file nodes in file system */
         long    fffree;    /* free file nodes in fs */
         fsidt  ffsid;     /* file system id (super-user only) */
         uidt   fowner;    /* user that mounted the file system */
         short   freserved1;        /* reserved for future use */
         short   ftype;     /* type of file system (reserved) */
         long    fflags;    /* copy of mount flags (reserved) */
         long    freserved2[2];     /* reserved for future use */
         char    ffstypename[MFSNAMELEN]; /* fs type name */
         char    fmntonname[MNAMELEN];    /* directory on which mounted */
         char    fmntfromname[MNAMELEN];  /* mounted file system */
         char    freserved3;        /* reserved for future use */
         long    freserved4[4];     /* reserved for future use */
     };

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

     If buf is given as NULL, ggeettffssssttaatt() returns just the number of mounted
     file systems.

     If flags is set to MNTNOWAIT, ggeettffssssttaatt() will directly return the
     information retained in the kernel to avoid delays caused by waiting for
     updated information from a file system that is perhaps temporarily unable
     to respond.  Some of the information returned may be out of date, how-
     ever; if flags is set to MNTWAIT instead, ggeettffssssttaatt() will request
     updated information from each mounted filesystem before returning.

RETURN VALUES
     Upon successful completion, the number of statfs structures is returned.
     Otherwise, -1 is returned and the global variable errno is set to indi-
     cate the error.

EERRRROORRSS
     GGeettffssssttaatt() 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 file system.

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

HISTORY     The ggeettffssssttaatt() function first appeared in 4.4BSD.

BSD                              June 9, 1993                              BSD