FSTATVFS(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
fstatvfs, statvfs — get file system information

SYNOPSIS

#include <sys/statvfs.h>

int fstatvfs(int fildes, struct statvfs *buf);
int statvfs(const char *restrict path, struct statvfs *restrict buf);

DESCRIPTION
The fstatvfs() function shall obtain information about the file system containing the file referenced by fildes.

The statvfs() function shall obtain information about the file system containing the file named by path.

For both functions, the buf argument is a pointer to a statvfs structure that shall be filled. Read, write, or execute permission of the named file is not required.

The following flags can be returned in the f_flag member:

ST_RDONLY
    Read-only file system.

ST_NOSUID
    Setuid/setgid bits ignored by exec.

It is unspecified whether all members of the statvfs structure have meaningful values on all file systems.

RETURN VALUE
Upon successful completion, statvfs() shall return 0. Otherwise, it shall return -1 and set errno to indicate the error.

ERRORS
The fstatvfs() and statvfs() functions shall fail if:

EIO An I/O error occurred while reading the file system.

EINTR
    A signal was caught during execution of the function.

EOVERFLOW
    One of the values to be returned cannot be represented correctly in the structure pointed to by buf.

The fstatvfs() function shall fail if:

EBADF
    The fildes argument is not an open file descriptor.

The statvfs() function shall fail if:

EACCES
    Search permission is denied on a component of the path prefix.

ELOOP
    A loop exists in symbolic links encountered during resolution of the path argument.

ENAMETOOLONG
    The length of a component of a pathname is longer than {NAME_MAX}.

ENOENT
    A component of path does not name an existing file or path is an empty string.

ENOTDIR
    A component of the path prefix names an existing file that is neither a directory nor a symbolic link to a directory, or the path argument contains at least one non-<slash> character and ends with one or more trailing <slash> characters and the last pathname component names an existing file that is neither a directory nor a symbolic link to a directory.

The statvfs() function may fail if:

ELOOP
    More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the path argument.

ENAMETOOLONG
    The length of a pathname exceeds {PATH_MAX}, or pathname resolution of a symbolic link produced an intermediate result with a length that exceeds {PATH_MAX}.

The following sections are informative.

EXAMPLES

  Obtaining File System Information Using fstatvfs()

The following example shows how to obtain file system information for the file system upon which the file named /home/cnd/mod1 resides, using the fstatvfs() function. The /home/cnd/mod1 file is opened with read/write privileges and the open file descriptor is passed to the fstatvfs() function.

    #include <sys/statvfs.h>
    #include <fcntl.h>

    struct statvfs buffer;
    int            status;
    ...
    fildes = open("/home/cnd/mod1", O_RDWR);
    status  = fstatvfs(fildes, &buffer);

  Obtaining File System Information Using statvfs()

The following example shows how to obtain file system information for the file system upon which the file named /home/cnd/mod1 resides, using the statvfs() function.

    #include <sys/statvfs.h>

    struct statvfs buffer;
    int            status;
    ...
    status = statvfs("/home/cnd/mod1", &buffer);

APPLICATION USAGE
None.

RATIONALE
None.

FUTURE DIRECTIONS
None.

SEE ALSO
chmod(), chown(), creat(), dup(), exec, fcntl(), link(), mknod(), open(), pipe(), read(), time(), unlink(), utime(), write()

The Base Definitions volume of POSIX.1-2017, <sys_statvfs.h>

COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

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