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28 .\" @(#)getmntopts.3 8.3 (Berkeley) 3/30/95
36 .Nd scan mount options
38 .Fd #include \&"mntopts.h"
41 .Fa "const char *options" "const struct mntopt *mopts"
42 .Fa "int *flagp" "int *altflagp"
47 function takes a comma separated option list and a list
48 of valid option names, and computes the bitmask
49 corresponding to the requested set of options.
53 is broken down into a sequence of comma separated tokens.
54 Each token is looked up in the table described by
57 the word referenced by either
63 field of the option's table entry)
65 The flag words are not initialized by
69 has the following format:
72 char *m_option; /* option name */
73 int m_inverse; /* is this a negative option, e.g., "dev" */
74 int m_flag; /* bit to set, e.g., MNT_RDONLY */
75 int m_altloc; /* non-zero to use altflagp rather than flagp */
79 The members of this structure are:
80 .Bl -tag -width m_inverse
88 that the name has the inverse meaning of the
92 is the string, whereas the
95 In this case, the sense of the string and the flag
100 the value of the bit to be set or cleared in
101 the flag word when the option is recognized.
102 The bit is set when the option is discovered,
103 but cleared if the option name was preceded
108 flag causes these two operations to be reversed.
110 the bit should be set or cleared in
116 Each of the user visible
118 flags has a corresponding
120 macro which defines an appropriate
123 To simplify the program interface and ensure consistency across all
124 programs, a general purpose macro,
127 contains an entry for all the generic VFS options.
128 In addition, the macros
137 Finally, the table must be terminated by an entry with a
141 Most commands will use the standard option set.
142 Local file systems which support the
144 flag, would also have an
147 This can be declared and used as follows:
151 struct mntopt mopts[] = {
158 mntflags = mntaltflags = 0;
160 getmntopts(options, mopts, &mntflags, &mntaltflags);
164 If the external integer variable
168 function displays an error message and exits if an
169 unrecognized option is encountered.
170 Otherwise unrecognized options are silently ignored.