1SYSFS(2)                   Linux Programmer's Manual                  SYSFS(2)
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NAME

6       sysfs - get file system type information
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SYNOPSIS

9       int sysfs(int option, const char *fsname);
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11       int sysfs(int option, unsigned int fs_index, char *buf);
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13       int sysfs(int option);
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DESCRIPTION

16       sysfs()  returns  information  about  the  file  system types currently
17       present in the kernel.  The specific form of the sysfs() call  and  the
18       information returned depends on the option in effect:
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20       1  Translate  the file-system identifier string fsname into a file-sys‐
21          tem type index.
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23       2  Translate the file-system type index fs_index into a null-terminated
24          file-system  identifier  string.  This string will be written to the
25          buffer pointed to by buf.  Make sure that buf has  enough  space  to
26          accept the string.
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28       3  Return  the  total  number of file system types currently present in
29          the kernel.
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31       The numbering of the file-system type indexes begins with zero.
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RETURN VALUE

34       On success, sysfs() returns the file-system index for  option  1,  zero
35       for  option  2, and the number of currently configured file systems for
36       option 3.  On error, -1 is returned, and errno is set appropriately.
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ERRORS

39       EFAULT Either fsname or buf is outside your accessible address space.
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41       EINVAL fsname is not a valid file-system type identifier;  fs_index  is
42              out-of-bounds; option is invalid.
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CONFORMING TO

45       SVr4.
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NOTES

48       On  Linux with the proc file system mounted on /proc, the same informa‐
49       tion can be derived from /proc/filesystems.
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BUGS

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

56       This  page  is  part of release 3.22 of the Linux man-pages project.  A
57       description of the project, and information about reporting  bugs,  can
58       be found at http://www.kernel.org/doc/man-pages/.
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62Linux                             1995-08-09                          SYSFS(2)