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fstatfs(2) [bsd man page]

STATFS(2)							System Calls Manual							 STATFS(2)

NAME
statfs, fstatfs - get file system statistics SYNOPSIS
#include <sys/param.h> #include <sys/mount.h> int statfs(path,buf) char *path; struct statfs *buf; int fstatfs(fd,buf) int fd; struct statfs *buf; DESCRIPTION
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: #define MNAMELEN 90 /* length of buffer for returned name */ struct statfs { short f_type; /* type of filesystem (see below) */ short f_flags; /* copy of mount flags */ short f_bsize; /* fundamental file system block size */ short f_iosize; /* 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 */ ino_t f_files; /* total file nodes in file system */ ino_t f_ffree; /* free file nodes in fs */ u_long f_fsid[2]; /* file system id */ long f_spare[4]; /* spare for later */ char f_mntonname[MNAMELEN]; /* mount point */ char f_mntfromname[MNAMELEN]; /* mounted filesystem */ }; /* * File system types. - Only UFS is supported so the other types are not * given. */ #define MOUNT_UFS 1 /* Fast Filesystem */ Fields that are undefined for a particular file system are set to -1. Fstatfs() returns the same information about an open file referenced by descriptor fd. RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, -1 is returned and the global variable errno is set to indicate the error. ERRORS
Statfs() fails if one or more of the following are true: [ENOTDIR] A component of the path prefix of Path is not a directory. [EINVAL] path contains a character with the high-order bit set. [ENAMETOOLONG] The length of a component of path exceeds 63 characters, or the length of path exceeds 255 characters. [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. Fstatfs() fails if one or more of the following are true: [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. HISTORY
The statfs function first appeared in 4.4BSD. 4.4 Berkeley Distribution December 26, 1995 STATFS(2)

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STATFS(2)						      BSD System Calls Manual							 STATFS(2)

NAME
statfs -- get file system statistics SYNOPSIS
#include <sys/param.h> #include <sys/mount.h> int statfs(const char *path, struct statfs *buf); int fstatfs(int fd, struct statfs *buf); DESCRIPTION
Statfs() returns information about a mounted file system. Path is the path name of any file within the mounted file system. Buf is a pointer to a statfs structure defined as follows: typedef struct { int32_t val[2]; } fsid_t; #define MFSNAMELEN 15 /* length of fs type name, not inc. nul */ #define MNAMELEN 90 /* length of buffer for returned name */ struct statfs { short f_otype; /* type of file system (reserved: zero) */ short f_oflags; /* copy of mount flags (reserved: zero) */ long f_bsize; /* fundamental file system block size */ long f_iosize; /* 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 (super-user only) */ uid_t f_owner; /* user that mounted the file system */ short f_reserved1; /* reserved for future use */ short f_type; /* type of file system (reserved) */ long f_flags; /* copy of mount flags (reserved) */ long f_reserved2[2]; /* reserved for future use */ char f_fstypename[MFSNAMELEN]; /* fs type name */ char f_mntonname[MNAMELEN]; /* directory on which mounted */ char f_mntfromname[MNAMELEN]; /* mounted file system */ char f_reserved3; /* reserved for future use */ long f_reserved4[4]; /* reserved for future use */ }; Fields that are undefined for a particular file system are set to -1. Fstatfs() returns the same information about an open file referenced by descriptor fd. RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, -1 is returned and the global variable errno is set to indicate the error. ERRORS
Statfs() fails if one or more of the following are true: [ENOTDIR] A component of the path prefix of Path is not a directory. [ENAMETOOLONG] The length of a component of path exceeds {NAME_MAX} characters, or the length of path exceeds {PATH_MAX} characters. [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. Fstatfs() fails if one or more of the following are true: [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. HISTORY
The statfs() function first appeared in 4.4BSD. BSD
February 11, 1994 BSD

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