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.
The <sys/statvfs.h> header shall define the statvfs structure, which shall include at least the following members:
unsigned long f_bsize File system block size. unsigned long f_frsize Fundamental file system block size. fsblkcnt_t f_blocks Total number of blocks on file system in units of f_frsize. fsblkcnt_t f_bfree Total number of free blocks. fsblkcnt_t f_bavail Number of free blocks available to non-privileged process. fsfilcnt_t f_files Total number of file serial numbers. fsfilcnt_t f_ffree Total number of free file serial numbers. fsfilcnt_t f_favail Number of file serial numbers available to non-privileged process. unsigned long f_fsid File system ID. unsigned long f_flag Bit mask of f_flag values. unsigned long f_namemax Maximum filename length.
The <sys/statvfs.h> header shall define the fsblkcnt_t and fsfilcnt_t types as described in <sys/types.h>.
The <sys/statvfs.h> header shall define the following symbolic constants for the f_flag member:
Read-only file system.
Does not support the semantics of the ST_ISUID and ST_ISGID file mode bits.
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.
int fstatvfs(int, struct statvfs *); int statvfs(const char *restrict, struct statvfs *restrict);
The following sections are informative.
The System Interfaces volume of POSIX.1-2017, fstatvfs()
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 .
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .