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OpenSolaris 2009.06 - man page for sysfs (opensolaris section 2)

sysfs(2)							   System Calls 							  sysfs(2)

sysfs - get file system type information
#include <sys/fstyp.h> #include <sys/fsid.h> int sysfs(int opcode, const char *fsname); int sysfs(int opcode, int fs_index, char *buf); int sysfs(int opcode);
The sysfs() function returns information about the file system types configured in the system. The number of arguments accepted by sysfs() depends on the opcode argument, which can take the following values: GETFSIND Translate fsname, a null-terminated file-system type identifier, into a file-system type index. GETFSTYP Translate fs_index, a file-system type index, into a null-terminated file-system type identifier and write it into the buffer pointed to by buf, which must be at least of size FSTYPSZ as defined in <sys/fstyp.h>. GETNFSTYP Return the total number of file system types configured in the system.
Upon successful completion, the value returned depends upon the opcode argument as follows: GETFSIND the file-system type index GETFSTYP 0 GETNFSTYP the number of file system types configured Otherwise, -1 is returned and errno is set to indicate the error.
The sysfs() function will fail if: EFAULT The buf or fsname argument points to an illegal address. EINVAL The fsname argument points to an invalid file-system identifier; the fs_index argument is 0 or invalid; or the opcode argument is invalid. SunOS 5.11 5 Jul 1990 sysfs(2)