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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 |
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8 | .\" Permission is granted to copy and distribute modified versions of this | |
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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14 | .\" manual page may be incorrect or out-of-date.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 | |
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17 | .\" have taken the same level of care in the production of this manual, | |
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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 |
fea681da MK |
24 | .\" |
25 | .\" Created Wed Aug 9 1995 Thomas K. Dyas <tdyas@eden.rutgers.edu> | |
26 | .\" | |
4b8c67d9 | 27 | .TH SYSFS 2 2017-09-15 "Linux" "Linux Programmer's Manual" |
fea681da | 28 | .SH NAME |
9ee4a2b6 | 29 | sysfs \- get filesystem type information |
fea681da MK |
30 | .SH SYNOPSIS |
31 | .BI "int sysfs(int " option ", const char *" fsname ); | |
dbfe9c70 | 32 | .PP |
fea681da | 33 | .BI "int sysfs(int " option ", unsigned int " fs_index ", char *" buf ); |
dbfe9c70 | 34 | .PP |
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35 | .BI "int sysfs(int " option ); |
36 | .SH DESCRIPTION | |
13752de1 MK |
37 | .BR "Note" : |
38 | if you are looking for information about the | |
39 | .B sysfs | |
40 | filesystem that is normally mounted at | |
41 | .IR /sys , | |
42 | see | |
43 | .BR sysfs (5). | |
44 | .PP | |
4a19240d | 45 | The (obsolete) |
e511ffb6 | 46 | .BR sysfs () |
4a19240d MK |
47 | system call returns information about the filesystem types |
48 | currently present in the kernel. | |
c13182ef | 49 | The specific form of the |
e511ffb6 | 50 | .BR sysfs () |
fea681da MK |
51 | call and the information returned depends on the |
52 | .I option | |
53 | in effect: | |
d1b4e37d | 54 | .TP 3 |
fea681da | 55 | .B 1 |
9ee4a2b6 | 56 | Translate the filesystem identifier string |
fea681da | 57 | .I fsname |
9ee4a2b6 | 58 | into a filesystem type index. |
fea681da MK |
59 | .TP |
60 | .B 2 | |
9ee4a2b6 | 61 | Translate the filesystem type index |
fea681da | 62 | .I fs_index |
9ee4a2b6 | 63 | into a null-terminated filesystem identifier string. |
c13182ef | 64 | This string will |
fea681da MK |
65 | be written to the buffer pointed to by |
66 | .IR buf . | |
67 | Make sure that | |
68 | .I buf | |
69 | has enough space to accept the string. | |
70 | .TP | |
71 | .B 3 | |
9ee4a2b6 | 72 | Return the total number of filesystem types currently present in the |
fea681da | 73 | kernel. |
fea681da | 74 | .PP |
9ee4a2b6 | 75 | The numbering of the filesystem type indexes begins with zero. |
47297adb | 76 | .SH RETURN VALUE |
fea681da | 77 | On success, |
e511ffb6 | 78 | .BR sysfs () |
9ee4a2b6 | 79 | returns the filesystem index for option |
fea681da MK |
80 | .BR 1 , |
81 | zero for option | |
82 | .BR 2 , | |
9ee4a2b6 | 83 | and the number of currently configured filesystems for option |
fea681da MK |
84 | .BR 3 . |
85 | On error, \-1 is returned, and | |
86 | .I errno | |
87 | is set appropriately. | |
88 | .SH ERRORS | |
89 | .TP | |
90 | .B EFAULT | |
91 | .RI "Either " fsname " or " buf | |
92 | is outside your accessible address space. | |
93 | .TP | |
94 | .B EINVAL | |
95 | .I fsname | |
9ee4a2b6 | 96 | is not a valid filesystem type identifier; |
fea681da MK |
97 | .I fs_index |
98 | is out-of-bounds; | |
99 | .I option | |
100 | is invalid. | |
47297adb | 101 | .SH CONFORMING TO |
fea681da | 102 | SVr4. |
19c98696 | 103 | .SH NOTES |
d1d721be MK |
104 | This System-V derived system call is obsolete; don't use it. |
105 | On systems with | |
fea681da | 106 | .IR /proc , |
e8fd5077 | 107 | the same information can be obtained via |
d1d721be MK |
108 | .IR /proc/filesystems ; |
109 | use that interface instead. | |
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110 | .SH BUGS |
111 | There is no libc or glibc support. | |
112 | There is no way to guess how large \fIbuf\fP should be. |