SYSFSSection: Linux Programmer's Manual (2)
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NAMEsysfs - get file system type information
SYNOPSISint sysfs(int option, const char *fsname);
int sysfs(int option, unsigned int fs_index, char *buf);
DESCRIPTIONsysfs() 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:
- Translate the file-system identifier string fsname into a file-system type index.
- Translate the file-system type index fs_index into a null-terminated file-system 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.
- Return the total number of file system types currently present in the kernel.
RETURN VALUEOn 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.
- Either fsname or buf is outside your accessible address space.
- fsname is not a valid file-system type identifier; fs_index is out-of-bounds; option is invalid.
NOTESOn Linux with the proc filesystem mounted on /proc, the same information can be derived from /proc/filesystems.
BUGSThere is no libc or glibc support. There is no way to guess how large buf should be.