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sysfs (2)
SYSFS(2) Linux Programmer's Manual SYSFS(2)
NAME
sysfs - get file system type information
SYNOPSIS
int sysfs(int option, const char *fsname);
int sysfs(int option, unsigned int fs_index, char *buf);
int sysfs(int option);
DESCRIPTION
sysfs() returns information about the file system types currently
present in the kernel. The specific form of the sysfs() call and the
information returned depends on the option in effect:
1 Translate the file-system identifier string fsname into a file-
system type index.
2 Translate the file-system type index fs_index into a null-termi-
nated file-system identifier string. This string will be writ-
ten to the buffer pointed to by buf. Make sure that buf has
enough space to accept the string.
3 Return the total number of file system types currently present
in the kernel.
The numbering of the file-system type indexes begins with zero.
RETURN VALUE
On success, sysfs() returns the file-system index for option 1, zero
for option 2, and the number of currently configured file systems for
option 3. On error, -1 is returned, and errno is set appropriately.
ERRORS
EFAULT Either fsname or buf is outside your accessible address space.
EINVAL fsname is not a valid file-system type identifier; fs_index is
out-of-bounds; option is invalid.
CONFORMING TO
SVr4.
NOTES
On Linux with the proc filesystem mounted on /proc, the same informa-
tion can be derived from /proc/filesystems.
BUGS
There is no libc or glibc support. There is no way to guess how large
buf should be.
Linux 1995-08-09 SYSFS(2)
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