getfsstat(2) [netbsd man page]

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

NAME

     getfsstat -- get list of all mounted file systems

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

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

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

DESCRIPTION

     The getfsstat() system call returns information about all mounted file systems.  The buf argument is a pointer to statfs structures, as
     described in statfs(2).

     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 byte count specified by bufsize.  Note, the bufsize argument is the number of bytes that buf can hold, not the
     count of statfs structures it will hold.

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

     Normally flags should be 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 file system.  Thus, some of the information will be out of date, but getfsstat() will not block wait-
     ing for information from a file system that is unable to respond.

RETURN VALUES

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

ERRORS

     The getfsstat() system call fails if one or more of the following are true:

     [EFAULT]           The buf argument 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 getfsstat() system call first appeared in 4.4BSD.

BSD                                                              November 20, 2003                                                             BSD

GETMNTINFO(3)						   BSD Library Functions Manual 					     GETMNTINFO(3)

NAME

     getmntinfo getmntinfo_r_np getmntinfo64 -- get information about mounted file systems

SYNOPSIS

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

     int
     getmntinfo(struct statfs **mntbufp, int flags);

     int
     getmntinfo_r_np(struct statfs **mntbufp, int flags);

TRANSITIIONAL SYNOPSIS (NOW DEPRECATED)
     int
     getmntinfo64(struct statfs64 **mntbufp, int flags);

DESCRIPTION

     The getmntinfo() function returns an array of statfs structures describing each currently mounted file system (see statfs(2)).  As statfs(2)
     indicates, the structure is defined differently depending on whether the macro _DARWIN_FEATURE_64_BIT_INODE is defined (see stat(2) for more
     information on this macro).

     The getmntinfo() and getmntinfo_r_np() functions pass their flags argument transparently to getfsstat(2).

     The getmntinfo() function maintains ownership of the results buffer it allocates, and may overwrite or free this buffer in subsequent calls
     to getmntinfo().  For this reason, getmntinfo() is not thread-safe.

     The getmntinfo_r_np() function is a thread-safe equivalent of getmntinfo() that allocates a new results buffer on every call and transfers
     ownership of this buffer to the caller.  The caller is responsible for freeing this memory with free(3).

RETURN VALUES

     On successful completion, getmntinfo() and getmntinfo_r_np() return a count of the number of elements in the array.  The pointer to the array
     is stored into mntbufp.

     If an error occurs, zero is returned and the external variable errno is set to indicate the error.  The getmntinfo() function may modify the
     mbtbufp pointer even in the case of an error.  In this situation, callers should consider any previous information returned by getmntinfo()
     to be lost.  The getmntinfo_r_np() function will not modify the mntbufp pointer in the case of an error.

ERRORS

     The getmntinfo() and getmntinfo_r_np() functions may fail and set errno for any of the errors specified for the library routines getfsstat(2)
     or malloc(3).

TRANSITIONAL DESCRIPTION (NOW DEPRECATED)
     The getmntinfo64() routine is equivalent to its corresponding non-64-suffixed routine, when 64-bit inodes are in effect.  It was added before
     there was support for the symbol variants, and so is now deprecated.  Instead of using it, set the _DARWIN_USE_64_BIT_INODE macro before
     including header files to force 64-bit inode support.

     The statfs64 structure used by this deprecated routine is the same as the statfs structure when 64-bit inodes are in effect.

SEE ALSO

     getfsstat(2), mount(2), stat(2), statfs(2), mount(8)

HISTORY

     The getmntinfo() function first appeared in 4.4BSD.  The getmntinfo_r_np() function first appeared in macOS 10.13.

BUGS

     The getmntinfo() function writes the array of structures to an internal static object and returns a pointer to that object.  Subsequent calls
     to getmntinfo() will modify the same object.

     The memory allocated by getmntinfo() cannot be free(3)'d by the application.

BSD
								  April 12, 2017							       BSD