NAME¶

sysfs - get file system type information

SYNOPSIS¶

int sysfs(int option, const char *fsname);

int sysfs(int option, unsigned int fs_index, char *buf);

int sysfs(int option);

DESCRIPTION¶

sysfs() returns information about the file system types currently present in the kernel. The specific form of the sysfs() call and the information returned depends on the option in effect:

1

Translate the file-system identifier string fsname into a file-system type index.

2

Translate the file-system type index fs_index into a null-terminated file-system identifier string. This string will be written to the buffer pointed to by buf. Make sure that buf has enough space to accept the string.

3

Return the total number of file system types currently present in the kernel.

The numbering of the file-system type indexes begins with zero.

RETURN VALUE¶

On success, sysfs() returns the file-system index for option 1, zero for option 2, and the number of currently configured file systems for option 3. On error, -1 is returned, and errno is set appropriately.

ERRORS¶

EFAULT

Either fsname or buf is outside your accessible address space.

EINVAL

fsname is not a valid file-system type identifier; fs_index is out-of-bounds; option is invalid.

CONFORMING TO¶

SVr4.

NOTES¶

On Linux with the proc file system mounted on /proc, the same information can be derived from /proc/filesystems.

BUGS¶

There is no libc or glibc support. There is no way to guess how large buf should be.

COLOPHON¶

This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.