SYSFS(2) System Calls 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

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.

RETURN VALUES

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.

ERRORS

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.


July 5, 1990 SYSFS(2)