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1 | .\" Copyright (C) 2002 Andries Brouwer (aeb@cwi.nl) |
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14 | .\" manual page may be incorrect or out-of-date.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 | .\" Inspired by a page written by Walter Harms. | |
26 | .\" | |
4b8c67d9 | 27 | .TH GETFSENT 3 2017-09-15 "GNU" "Linux Programmer's Manual" |
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28 | .SH NAME |
29 | getfsent, getfsspec, getfsfile, setfsent, endfsent \- handle fstab entries | |
30 | .SH SYNOPSIS | |
31 | .B #include <fstab.h> | |
68e4db0a | 32 | .PP |
0daa9e92 | 33 | .B "void endfsent(void);" |
68e4db0a | 34 | .PP |
0daa9e92 | 35 | .B "struct fstab *getfsent(void);" |
68e4db0a | 36 | .PP |
fea681da | 37 | .BI "struct fstab *getfsfile(const char *" mount_point ); |
68e4db0a | 38 | .PP |
fea681da | 39 | .BI "struct fstab *getfsspec(const char *" special_file ); |
68e4db0a | 40 | .PP |
0daa9e92 | 41 | .B "int setfsent(void);" |
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42 | .SH DESCRIPTION |
43 | These functions read from the file | |
44 | .IR /etc/fstab . | |
c9942389 MK |
45 | The |
46 | .IR "struct fstab" | |
47 | is defined by: | |
dd3568a1 | 48 | .PP |
088a639b | 49 | .in +4n |
b8302363 | 50 | .EX |
fea681da | 51 | struct fstab { |
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52 | char *fs_spec; /* block device name */ |
53 | char *fs_file; /* mount point */ | |
d647d5e1 | 54 | char *fs_vfstype; /* file-system type */ |
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55 | char *fs_mntops; /* mount options */ |
56 | const char *fs_type; /* rw/rq/ro/sw/xx option */ | |
57 | int fs_freq; /* dump frequency, in days */ | |
58 | int fs_passno; /* pass number on parallel dump */ | |
fea681da | 59 | }; |
b8302363 | 60 | .EE |
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61 | .in |
62 | .PP | |
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63 | Here the field |
64 | .I fs_type | |
65 | contains (on a *BSD system) | |
66 | one of the five strings "rw", "rq", "ro", "sw", "xx" | |
67 | (read-write, read-write with quota, read-only, swap, ignore). | |
847e0d88 | 68 | .PP |
fea681da | 69 | The function |
63aa9df0 | 70 | .BR setfsent () |
fea681da | 71 | opens the file when required and positions it at the first line. |
dd3568a1 | 72 | .PP |
fea681da | 73 | The function |
63aa9df0 | 74 | .BR getfsent () |
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75 | parses the next line from the file. |
76 | (After opening it when required.) | |
dd3568a1 | 77 | .PP |
fea681da | 78 | The function |
63aa9df0 | 79 | .BR endfsent () |
fea681da | 80 | closes the file when required. |
dd3568a1 | 81 | .PP |
fea681da | 82 | The function |
63aa9df0 | 83 | .BR getfsspec () |
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84 | searches the file from the start and returns the first entry found |
85 | for which the | |
86 | .I fs_spec | |
87 | field matches the | |
88 | .I special_file | |
89 | argument. | |
dd3568a1 | 90 | .PP |
fea681da | 91 | The function |
63aa9df0 | 92 | .BR getfsfile () |
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93 | searches the file from the start and returns the first entry found |
94 | for which the | |
95 | .I fs_file | |
96 | field matches the | |
97 | .I mount_point | |
98 | argument. | |
47297adb | 99 | .SH RETURN VALUE |
fea681da | 100 | Upon success, the functions |
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101 | .BR getfsent (), |
102 | .BR getfsfile (), | |
fea681da | 103 | and |
63aa9df0 | 104 | .BR getfsspec () |
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105 | return a pointer to a |
106 | .IR "struct fstab" , | |
107 | while | |
63aa9df0 | 108 | .BR setfsent () |
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109 | returns 1. |
110 | Upon failure or end-of-file, these functions return NULL and 0, respectively. | |
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111 | .\" .SH HISTORY |
112 | .\" The | |
113 | .\" .BR getfsent () | |
114 | .\" function appeared in 4.0BSD; the other four functions appeared in 4.3BSD. | |
a93d3fc0 PH |
115 | .SH ATTRIBUTES |
116 | For an explanation of the terms used in this section, see | |
117 | .BR attributes (7). | |
118 | .TS | |
119 | allbox; | |
3b399480 | 120 | lb lb lbw24 |
a93d3fc0 PH |
121 | l l l. |
122 | Interface Attribute Value | |
123 | T{ | |
a93d3fc0 | 124 | .BR endfsent (), |
3b399480 MS |
125 | .br |
126 | .BR setfsent () | |
127 | T} Thread safety MT-Unsafe race:fsent | |
128 | T{ | |
129 | .BR getfsent (), | |
130 | .br | |
a93d3fc0 | 131 | .BR getfsspec (), |
3b399480 | 132 | .br |
a93d3fc0 | 133 | .BR getfsfile () |
3b399480 | 134 | T} Thread safety MT-Unsafe race:fsent locale |
a93d3fc0 | 135 | .TE |
47297adb | 136 | .SH CONFORMING TO |
422470aa | 137 | These functions are not in POSIX.1. |
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138 | Several operating systems have them, for example, |
139 | *BSD, SunOS, Digital UNIX, AIX (which also has a | |
31e9a9ec | 140 | .BR getfstype ()). |
0c2ec4f1 | 141 | HP-UX has functions of the same names, |
c9942389 MK |
142 | that however use a |
143 | .IR "struct checklist" | |
144 | instead of a | |
145 | .IR "struct fstab" , | |
0c2ec4f1 | 146 | and calls these functions obsolete, superseded by |
fea681da MK |
147 | .BR getmntent (3). |
148 | .SH NOTES | |
149 | These functions are not thread-safe. | |
dd3568a1 | 150 | .PP |
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151 | Since Linux allows mounting a block special device in several places, |
152 | and since several devices can have the same mount point, where the | |
153 | last device with a given mount point is the interesting one, | |
154 | while | |
63aa9df0 | 155 | .BR getfsfile () |
fea681da | 156 | and |
63aa9df0 | 157 | .BR getfsspec () |
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158 | only return the first occurrence, these two functions are not suitable |
159 | for use under Linux. | |
47297adb | 160 | .SH SEE ALSO |
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161 | .BR getmntent (3), |
162 | .BR fstab (5) |