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RedHat 9 (Linux i386) - man page for sysfs (redhat section 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 informa- tion 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.
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 information 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)