Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

sysfs(2)


NAME

   sysfs - get filesystem type information

SYNOPSIS

   int sysfs(int option, const char *fsname);

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

   int sysfs(int option);

DESCRIPTION

   sysfs()  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.

RETURN VALUE

   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 appropriately.

ERRORS

   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.

CONFORMING TO

   SVr4.

NOTES

   This  System-V  derived  system  call  is  obsolete;  don't use it.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.

BUGS

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

COLOPHON

   This page is part of release 4.09 of the Linux  man-pages  project.   A
   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at
   https://www.kernel.org/doc/man-pages/.



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.



Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.



Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.



Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner