sysfs(2)

NAME

sysfs − get file system type information

SYNOPSIS

#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);

DESCRIPTION

sysfs() returns information about the file system types configured in the system. The number of arguments accepted by sysfs() varies and depends on the opcode. The currently recognized opcodes and their functions are:

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; this buffer 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.

RETURN VALUES

Upon successful completion, sysfs() returns the file-system type index if the opcode is GETFSIND, a value of 0 if the opcode is GETFSTYP, or the number of file system types configured if the opcode is GETNFSTYP. Otherwise, a value of −1 is returned and errno is set to indicate the error.

ERRORS

sysfs() fails if one or more of the following are true:

EFAULT buf or fsname points to an illegal address.

EINVAL fsname points to an invalid file-system identifier; fs_index is zero, or invalid; opcode is invalid.