sysfs.2 (2010 09)

s
sysfs(2) sysfs(2)
NAME
sysfs - get file system type information
SYNOPSIS
#include <sys/fstyp.h>
int sysfs(int opcode, const char *fsname);
int sysfs(int opcode, int fs_index, char *buf );
int sysfs(int opcode);
DESCRIPTION
sysfs is used to return information about the file system types configured in the system. The number
arguments accepted by sysfs varies and depends on the opcode .
The current 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>.
If there is no file-system type
configured at fs_index, a null string is returned for the file-system type identifier.
GETNFSTYP Return one more than the largest file system type configured. This is not the
number of file system types configured, because the type numbers may not be con-
tiguous. See the example below.
RETURN VALUE
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 and sets errno to the value indicated:
[EINVAL] fsname points to an invalid file-system identifier; fs_index is negative or greater than
the largest file-system type index; opcode is invalid.
[EFAULT] buf or fsname points to an invalid user address.
EXAMPLES
List the filesystem types configured in the system.
#include <sys/fstyp.h>
int max_type, error, i;
char name[FSTYPSZ];
max_type = sysfs(GETNFSTYP);
for (i = 0; i < max_type; i++) {
error = sysfs(GETFSTYP, i, name);
if (error == 0)
my_print(name);
}
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1