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1 | .\" Copyright (C) 1995, Thomas K. Dyas <tdyas@eden.rutgers.edu> |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
5 | .\" manual provided the copyright notice and this permission notice are | |
6 | .\" preserved on all copies. | |
7 | .\" | |
8 | .\" Permission is granted to copy and distribute modified versions of this | |
9 | .\" manual under the conditions for verbatim copying, provided that the | |
10 | .\" entire resulting derived work is distributed under the terms of a | |
11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
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13 | .\" Since the Linux kernel and libraries are constantly changing, this |
14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
15 | .\" responsibility for errors or omissions, or for damages resulting from | |
16 | .\" the use of the information contained herein. The author(s) may not | |
17 | .\" have taken the same level of care in the production of this manual, | |
18 | .\" which is licensed free of charge, as they might when working | |
19 | .\" professionally. | |
c13182ef | 20 | .\" |
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21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
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24 | .\" |
25 | .\" Created Wed Aug 9 1995 Thomas K. Dyas <tdyas@eden.rutgers.edu> | |
26 | .\" | |
d1d721be | 27 | .TH SYSFS 2 2010-06-27 "Linux" "Linux Programmer's Manual" |
fea681da | 28 | .SH NAME |
9ee4a2b6 | 29 | sysfs \- get filesystem type information |
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30 | .SH SYNOPSIS |
31 | .BI "int sysfs(int " option ", const char *" fsname ); | |
32 | ||
33 | .BI "int sysfs(int " option ", unsigned int " fs_index ", char *" buf ); | |
34 | ||
35 | .BI "int sysfs(int " option ); | |
36 | .SH DESCRIPTION | |
e511ffb6 | 37 | .BR sysfs () |
9ee4a2b6 | 38 | returns information about the filesystem types currently present in |
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39 | the kernel. |
40 | The specific form of the | |
e511ffb6 | 41 | .BR sysfs () |
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42 | call and the information returned depends on the |
43 | .I option | |
44 | in effect: | |
d1b4e37d | 45 | .TP 3 |
fea681da | 46 | .B 1 |
9ee4a2b6 | 47 | Translate the filesystem identifier string |
fea681da | 48 | .I fsname |
9ee4a2b6 | 49 | into a filesystem type index. |
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50 | .TP |
51 | .B 2 | |
9ee4a2b6 | 52 | Translate the filesystem type index |
fea681da | 53 | .I fs_index |
9ee4a2b6 | 54 | into a null-terminated filesystem identifier string. |
c13182ef | 55 | This string will |
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56 | be written to the buffer pointed to by |
57 | .IR buf . | |
58 | Make sure that | |
59 | .I buf | |
60 | has enough space to accept the string. | |
61 | .TP | |
62 | .B 3 | |
9ee4a2b6 | 63 | Return the total number of filesystem types currently present in the |
fea681da | 64 | kernel. |
fea681da | 65 | .PP |
9ee4a2b6 | 66 | The numbering of the filesystem type indexes begins with zero. |
47297adb | 67 | .SH RETURN VALUE |
fea681da | 68 | On success, |
e511ffb6 | 69 | .BR sysfs () |
9ee4a2b6 | 70 | returns the filesystem index for option |
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71 | .BR 1 , |
72 | zero for option | |
73 | .BR 2 , | |
9ee4a2b6 | 74 | and the number of currently configured filesystems for option |
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75 | .BR 3 . |
76 | On error, \-1 is returned, and | |
77 | .I errno | |
78 | is set appropriately. | |
79 | .SH ERRORS | |
80 | .TP | |
81 | .B EFAULT | |
82 | .RI "Either " fsname " or " buf | |
83 | is outside your accessible address space. | |
84 | .TP | |
85 | .B EINVAL | |
86 | .I fsname | |
9ee4a2b6 | 87 | is not a valid filesystem type identifier; |
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88 | .I fs_index |
89 | is out-of-bounds; | |
90 | .I option | |
91 | is invalid. | |
47297adb | 92 | .SH CONFORMING TO |
fea681da | 93 | SVr4. |
19c98696 | 94 | .SH NOTES |
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95 | This System-V derived system call is obsolete; don't use it. |
96 | On systems with | |
fea681da | 97 | .IR /proc , |
e8fd5077 | 98 | the same information can be obtained via |
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99 | .IR /proc/filesystems ; |
100 | use that interface instead. | |
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101 | .SH BUGS |
102 | There is no libc or glibc support. | |
103 | There is no way to guess how large \fIbuf\fP should be. |