Linux man pages : sysfs (2)
SYSFS(2) Linux Programmer's Manual SYSFS(2)
sysfs - get file system type information
int sysfs(int option, const char *fsname);
int sysfs(int option, unsigned int fs_index, char *buf);
int sysfs(int option);
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-termi-
nated 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.
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.
EINVAL fsname is not a valid file-system type identifier; fs_index is
out-of-bounds; option is invalid.
EFAULT Either fsname or buf is outside your accessible address space.
On Linux with the proc filesystem mounted on /proc, the same informa-
tion can be derived from /proc/filesystems.
There is no libc or glibc support. There is no way to guess how large
buf should be.
Linux 1.3.16 1995-08-09 SYSFS(2)