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RedHat 9 (Linux i386) - man page for statfs (redhat section 2)

STATFS(2)						     Linux Programmer's Manual							 STATFS(2)

statfs, fstatfs - get file system statistics
#include <sys/vfs.h> int statfs(const char *path, struct statfs *buf); int fstatfs(int fd, struct statfs *buf);
statfs returns information about a mounted file system. path is the path name of any file within the mounted filesystem. buf is a pointer to a statfs structure defined as follows: struct statfs { long f_type; /* type of filesystem (see below) */ long f_bsize; /* 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 */ long f_files; /* total file nodes in file system */ long f_ffree; /* free file nodes in fs */ fsid_t f_fsid; /* file system id */ long f_namelen; /* maximum length of filenames */ long f_spare[6]; /* spare for later */ }; File system types: linux/affs_fs.h: AFFS_SUPER_MAGIC 0xADFF linux/efs_fs.h: EFS_SUPER_MAGIC 0x00414A53 linux/ext_fs.h: EXT_SUPER_MAGIC 0x137D linux/ext2_fs.h: EXT2_OLD_SUPER_MAGIC 0xEF51 EXT2_SUPER_MAGIC 0xEF53 linux/hpfs_fs.h: HPFS_SUPER_MAGIC 0xF995E849 linux/iso_fs.h: ISOFS_SUPER_MAGIC 0x9660 linux/minix_fs.h: MINIX_SUPER_MAGIC 0x137F /* orig. minix */ MINIX_SUPER_MAGIC2 0x138F /* 30 char minix */ MINIX2_SUPER_MAGIC 0x2468 /* minix V2 */ MINIX2_SUPER_MAGIC2 0x2478 /* minix V2, 30 char names */ linux/msdos_fs.h: MSDOS_SUPER_MAGIC 0x4d44 linux/ncp_fs.h: NCP_SUPER_MAGIC 0x564c linux/nfs_fs.h: NFS_SUPER_MAGIC 0x6969 linux/proc_fs.h: PROC_SUPER_MAGIC 0x9fa0 linux/smb_fs.h: SMB_SUPER_MAGIC 0x517B linux/sysv_fs.h: XENIX_SUPER_MAGIC 0x012FF7B4 SYSV4_SUPER_MAGIC 0x012FF7B5 SYSV2_SUPER_MAGIC 0x012FF7B6 COH_SUPER_MAGIC 0x012FF7B7 linux/ufs_fs.h: UFS_MAGIC 0x00011954 linux/xfs_fs.h: XFS_SUPER_MAGIC 0x58465342 linux/xia_fs.h: _XIAFS_SUPER_MAGIC 0x012FD16D Fields that are undefined for a particular file system are set to 0. fstatfs returns the same information about an open file referenced by descriptor fd.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
For statfs: ENOTDIR A component of the path prefix of path is not a directory. ENAMETOOLONG path is too long. ENOENT The file referred to by path does not exist. EACCES Search permission is denied for a component of the path prefix of path. ELOOP Too many symbolic links were encountered in translating path. EFAULT Buf or path points to an invalid address. EIO An I/O error occurred while reading from or writing to the file system. ENOMEM Insufficient kernel memory was available. ENOSYS The filesystem path is on does not support statfs. For fstatfs: EBADF fd is not a valid open file descriptor. EFAULT buf points to an invalid address. EIO An I/O error occurred while reading from or writing to the file system. ENOSYS The filesystem fd is open on does not support statfs.
The Linux statfs was inspired by the 4.4BSD one (but they do not use the same structure).
stat(2) Linux 2.0.30 1997-08-21 STATFS(2)