получить информацию о файловой системе (get file system information)
Пролог (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.
Имя (Name)
fstatvfs, statvfs — get file system information
Синопсис (Synopsis)
#include <sys/statvfs.h>
int fstatvfs(int fildes, struct statvfs *buf);
int statvfs(const char *restrict path, struct statvfs *restrict buf);
Описание (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.
Возвращаемое значение (Return value)
Upon successful completion, statvfs() shall return 0. Otherwise,
it shall return -1 and set errno to indicate the error.
Ошибки (Error)
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.
Примеры (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);
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
chmod(3p), chown(3p), creat(3p), dup(3p), exec(1p), fcntl(3p),
link(3p), mknod(3p), open(3p), pipe(3p), read(3p), time(3p),
unlink(3p), utime(3p), write(3p)
The Base Definitions volume of POSIX.1‐2017, sys_statvfs.h(0p)
