Manpages - sysfs.2

sysfs - get filesystem type information

  int sysfs(int option, const char *fsname);
  int sysfs(int option, unsigned int fs_index, char *buf);
  int sysfs(int option);

Note: if you are looking for information about the sysfs filesystem that is normally mounted at /sys, see *sysfs*(5).

The (obsolete) *sysfs*() system call returns information about the filesystem 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 filesystem identifier string fsname into a filesystem type index.

2

Translate the filesystem type index fs_index into a null-terminated filesystem identifier string. This string will be written to the buffer pointed to by buf. Make sure that buf has enough space to accept the string.

3

Return the total number of filesystem types currently present in the kernel.

The numbering of the filesystem type indexes begins with zero.

On success, sysfs*() returns the filesystem index for option *1, zero for option 2, and the number of currently configured filesystems for option 3. On error, -1 is returned, and errno is set to indicate the error.

EFAULT

Either fsname or buf is outside your accessible address space.

EINVAL

fsname is not a valid filesystem type identifier; fs_index is out-of-bounds; option is invalid.

SVr4.

This System-V derived system call is obsolete; don’t use it. On systems with /proc, the same information can be obtained via /proc; use that interface instead.

There is no libc or glibc support. There is no way to guess how large buf should be.

*proc*(5), *sysfs*(5)

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