Manpage of SYSFS
SYSFSSection: Linux Programmer's Manual (2)
NAMEsysfs - get filesystem type information
SYNOPSISint sysfs(int option, const char *fsname);
int sysfs(int option, unsigned int fs_index, char *buf);
DESCRIPTIONNote: if you are looking for information about the sysfsfilesystem 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 optionin effect:
- Translate the filesystem identifier string fsnameinto a filesystem type index.
- Translate the filesystem type index fs_indexinto a null-terminated filesystem identifier string. This string will be written to the buffer pointed to by buf. Make sure that bufhas enough space to accept the string.
- Return the total number of filesystem types currently present in the kernel.
RETURN VALUEOn 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 errnois set appropriately.
- Either fsname or bufis outside your accessible address space.
- fsnameis not a valid filesystem type identifier; fs_indexis out-of-bounds; optionis invalid.
NOTESThis System-V derived system call is obsolete; don't use it. On systems with /proc, the same information can be obtained via /proc/filesystems; use that interface instead.
BUGSThere is no libc or glibc support. There is no way to guess how large buf should be.
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