| GETMNTOPTS(3) | Library Functions Manual | GETMNTOPTS(3) | 
getmntopts, getmntoptstr,
  getmntoptnum, freemntopts
  —
#include <mntopts.h>
mntoptparse_t
  
  getmntopts(const
    char *options, const
    struct mntopt *mopts, int
    *flagp, int
    *altflagp);
const char *
  
  getmntoptstr(mntoptparse_t
    mp, const char
    *opt);
long
  
  getmntoptnum(mntoptparse_t
    mp, const char
    *opt);
void
  
  freemntopts(mntoptparse_t
    mp);
getmntopts() function takes a comma separated option
  list and a list of valid option names, and computes the bitmasks corresponding
  to the requested set of options.
The string options is broken down into a
    sequence of comma separated tokens. Each token is looked up in the table
    described by mopts and the bits in the word referenced
    by either flagp or altflagp
    (depending on the m_altloc field of the option's
    table entry) are updated. The flag words are not initialized by
    getmntopts(). The table,
    mopts, has the following format:
struct mntopt {
	const char *m_option;	/* option name */
	int m_inverse;		/* negative option, e.g., "dev" */
	int m_flag;		/* bit to set, e.g., MNT_RDONLY */
	int m_altloc;		/* use altflagp rather than flagp */
};
The members of this structure are:
getmntopts() that the name has the inverse
      meaning of the bit. For example, “suid” is the string,
      whereas the mount flag is MNT_NOSUID. In this
      case, the sense of the string and the flag are inverted, so the
      m_inverse flag should be set.Each of the user visible MNT_ flags has a
    corresponding MOPT_ macro which defines an
    appropriate struct mntopt entry. To simplify the
    program interface and ensure consistency across all programs, a general
    purpose macro, MOPT_STDOPTS, is defined which
    contains an entry for all the generic VFS options. In addition, the macros
    MOPT_FORCE and MOPT_UPDATE
    exist to enable the MNT_FORCE and
    MNT_UPDATE flags to be set. Finally, the table must
    be terminated by an entry with a NULL first
  element.
getmntopts() returns a
    mntoptparse_t handle that can be used in subsequent
    getmntoptstr() and
    getmntoptnum() calls to fetch a value for an option
    and that must be freed with a call to freemntopts().
    If an error occurred, then if the external integer value
    getmnt_silent is zero then
    getmntopts() prints an error message and exits; if
    getmnt_silent is non-zero then
    getmntopts() returns
  NULL.
The getmntoptstr() function returns the
    string value of the named option, if such a value was set in the option
    string. If the value was not set, then if the external integer value
    getmnt_silent is zero then
    getmntoptstr() prints an error message and exits; if
    getmnt_silent is non-zero then
    getmntoptstr() returns
  NULL.
The getmntoptnum() function returns the
    long value of the named option, if such a value was set in the option
    string. If the value was not set, or could not be converted from a string to
    a long, then if the external integer value
    getmnt_silent is zero then
    getmntoptnum() prints an error message and exits; if
    getmnt_silent is non-zero then
    getmntoptnum() returns -1.
The freemntopts() function frees the
    storage used by getmntopts().
getmntopts() returns NULL if an
  error occurred. Note that some bits may already have been set in
  flagp and altflagp even if
  NULL is returned.
  getmntoptstr() returns NULL if
  an error occurred. getmntoptnum() returns -1 if an
  error occurred.
MNT_UPDATE flag, would also have an
  MOPT_UPDATE entry. This can be declared and used as
  follows:
#include <mntopts.h>
static const struct mntopt mopts[] = {
	MOPT_STDOPTS,
	MOPT_UPDATE,
	{ NULL }
};
...
long val;
mntoptparse_t mp;
mntflags = mntaltflags = 0;
...
mp = getmntopts(options, mopts, &mntflags, &mntaltflags);
if (mp == NULL)
	err(EXIT_FAILURE, "getmntopts");
...
val = getmntoptnum(mp, "rsize");
freemntopts(mp);
getmntopts(),
  getmntoptstr(), and
  getmntoptnum() functions display an error message and
  exit if an error occurred. By default getmnt_silent is
  zero.
getmntopts() function appeared in
  4.4BSD. It was moved to the utilities library and
  enhanced to retrieve option values in NetBSD 2.0.
| May 4, 2010 | NetBSD 9.4 |