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BSD 2.11 - man page for getfsstat (bsd section 2)

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 Thus, some of the information will be out of date, but getfsstat() will not block waiting for information from a filesystem that is unable to respond.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)
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