mirror of https://github.com/mkerrisk/man-pages
100 lines
2.9 KiB
Groff
100 lines
2.9 KiB
Groff
.\" Copyright (C) 1995, Thomas K. Dyas <tdyas@eden.rutgers.edu>
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" Created Wed Aug 9 1995 Thomas K. Dyas <tdyas@eden.rutgers.edu>
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.\"
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.TH SYSFS 2 1995-08-09 "Linux 1.3.16" "Linux Programmer's Manual"
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.SH NAME
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sysfs \- get file system type information
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.SH SYNOPSIS
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.BI "int sysfs(int " option ", const char *" fsname );
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.BI "int sysfs(int " option ", unsigned int " fs_index ", char *" buf );
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.BI "int sysfs(int " option );
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.SH DESCRIPTION
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.BR sysfs ()
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returns information about the file system types currently present in
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the kernel. The specific form of the
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.BR sysfs ()
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call and the information returned depends on the
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.I option
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in effect:
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.TP
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.B 1
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Translate the file-system identifier string
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.I fsname
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into a file-system type index.
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.TP
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.B 2
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Translate the file-system type index
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.I fs_index
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into a null-terminated file-system identifier string. This string will
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be written to the buffer pointed to by
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.IR buf .
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Make sure that
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.I buf
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has enough space to accept the string.
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.TP
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.B 3
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Return the total number of file system types currently present in the
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kernel.
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.PP
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The numbering of the file-system type indexes begins with zero.
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.SH "RETURN VALUE"
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On success,
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.BR sysfs ()
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returns the file-system index for option
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.BR 1 ,
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zero for option
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.BR 2 ,
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and the number of currently configured file systems for option
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.BR 3 .
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On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EFAULT
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.RI "Either " fsname " or " buf
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is outside your accessible address space.
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.TP
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.B EINVAL
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.I fsname
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is not a valid file-system type identifier;
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.I fs_index
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is out-of-bounds;
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.I option
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is invalid.
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.SH "CONFORMING TO"
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SVr4.
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.SH NOTE
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On Linux with the
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.I proc
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filesystem mounted on
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.IR /proc ,
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the same information can be derived from
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.IR /proc/filesystems .
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.SH BUGS
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There is no libc or glibc support.
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There is no way to guess how large \fIbuf\fP should be.
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