sysfs(2) System Calls Manual sysfs(2)
NAME
sysfs - gather information about file system types
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 );
PARAMETERS
Points to the buffer where the file system type is placed. The buffer size must be equal to FSTYPSZ as defined in <sys/fstyp.h>. Speci-
fies an index file system type. Specifies a null-terminated file system type identifier. Specifies an operation used to obtain informa-
tion about the file system types.
DESCRIPTION
This function gathers information about configured file system types. Depending on the operation you want to perform, the opcode parameter
may be specified by itself, or in combination with the other available parameters as shown in the SYNOPSIS section.
The opcode parameter may be one of the following: Must be specified with the fsname parameter. This operation changes the specified null-
terminated file system type identifier to a file system type identifier. Must be specified with the parameters fs_index and buf. This
operation changes the specified file system type index to a null-terminated type file system type identifier and writes it into the buffer
specified. Specified by itself, this operation requests the total number of file system types configured in the system to be returned.
RETURN VALUES
The following values are returned on success: If GETFSIND is specified, the file system type index is returned. If GETFSTYP is specified,
a value of zero (0) is returned. If GETNFSTYP is specified, the number of file system types configured in the system is returned.
On error, a value of -1 is returned and errno is set.
ERRORS
One or more of the following may be returned on failure: Indicates an invalid file system identifier is pointed to fsname, the specified
fs_index is either zero (0) or invalid, or the specified opcode is invalid. Indicates that either fsname or buf is pointing to an invalid
user address. Indicates that a file system was installed with a name that exceeds the buffer size of FSTYPSZ.
sysfs(2)