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sys_statvfs.h(0p) [posix man page]

<sys/statvfs.h>(P)					     POSIX Programmer's Manual						<sys/statvfs.h>(P)

sys/statvfs.h - VFS File System information structure SYNOPSIS
#include <sys/statvfs.h> DESCRIPTION
The <sys/statvfs.h> header shall define the statvfs structure that includes 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 fsblkcnt_t and fsfilcnt_t types shall be defined as described in <sys/types.h> . The following flags for the f_flag member shall be defined: ST_RDONLY Read-only file system. ST_NOSUID 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 statvfs(const char *restrict, struct statvfs *restrict); int fstatvfs(int, struct statvfs *); The following sections are informative. APPLICATION USAGE
<sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, fstatvfs(), statvfs() COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 . IEEE
/The Open Group 2003 <sys/statvfs.h>(P)

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STATVFS(3)						     Linux Programmer's Manual							STATVFS(3)

statvfs, fstatvfs - get file system statistics SYNOPSIS
#include <sys/statvfs.h> int statvfs(const char *path, struct statvfs *buf); int fstatvfs(int fd, struct statvfs *buf); DESCRIPTION
The function statvfs() returns information about a mounted file system. path is the pathname of any file within the mounted file system. buf is a pointer to a statvfs structure defined approximately as follows: struct statvfs { unsigned long f_bsize; /* file system block size */ unsigned long f_frsize; /* fragment size */ fsblkcnt_t f_blocks; /* size of fs in f_frsize units */ fsblkcnt_t f_bfree; /* # free blocks */ fsblkcnt_t f_bavail; /* # free blocks for unprivileged users */ fsfilcnt_t f_files; /* # inodes */ fsfilcnt_t f_ffree; /* # free inodes */ fsfilcnt_t f_favail; /* # free inodes for unprivileged users */ unsigned long f_fsid; /* file system ID */ unsigned long f_flag; /* mount flags */ unsigned long f_namemax; /* maximum filename length */ }; Here the types fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>. Both used to be unsigned long. The field f_flag is a bit mask (of mount flags, see mount(8)). Bits defined by POSIX are ST_RDONLY Read-only file system. ST_NOSUID Set-user-ID/set-group-ID bits are ignored by exec(3). It is unspecified whether all members of the returned struct have meaningful values on all file systems. fstatvfs() returns the same information about an open file referenced by descriptor fd. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EACCES (statvfs()) Search permission is denied for a component of the path prefix of path. (See also path_resolution(7).) EBADF (fstatvfs()) fd is not a valid open file descriptor. EFAULT Buf or path points to an invalid address. EINTR This call was interrupted by a signal. EIO An I/O error occurred while reading from the file system. ELOOP (statvfs()) Too many symbolic links were encountered in translating path. ENAMETOOLONG (statvfs()) path is too long. ENOENT (statvfs()) The file referred to by path does not exist. ENOMEM Insufficient kernel memory was available. ENOSYS The file system does not support this call. ENOTDIR (statvfs()) A component of the path prefix of path is not a directory. EOVERFLOW Some values were too large to be represented in the returned struct. CONFORMING TO
The Linux kernel has system calls statfs(2) and fstatfs(2) to support this library call. The current glibc implementations of pathconf(path, _PC_REC_XFER_ALIGN); pathconf(path, _PC_ALLOC_SIZE_MIN); pathconf(path, _PC_REC_MIN_XFER_SIZE); respectively use the f_frsize, f_frsize, and f_bsize fields of the return value of statvfs(path,buf). SEE ALSO
statfs(2) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2003-08-22 STATVFS(3)
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