CentOS 7.0 - man page for sysfs (centos section 2)
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SYSFS(2) Linux Programmer's Manual SYSFS(2)
sysfs - get file system type information
int sysfs(int option, const char *fsname);
int sysfs(int option, unsigned int fs_index, char *buf);
int sysfs(int option);
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
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-terminated file-system iden-
tifier 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 file system types currently present in the kernel.
The numbering of the file-system type indexes begins with zero.
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.
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.
This System-V derived system call is obsolete; don't use it.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.
There is no libc or glibc support. There is no way to guess how large buf should be.
This page is part of release 3.53 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
Linux 2010-06-27 SYSFS(2)
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