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GETMNTENT(3C)							 GETMNTENT(3C)

NAME
       getmntent, getmntany, getextmntent, hasmntopt, putmntent, resetmnttab -
       get mounted device information

SYNOPSIS
       #include <stdio.h>
       #include <sys/mnttab.h>

       int getmntent(FILE *fp, struct mnttab *mp);

       int getmntany(FILE *fp, struct mnttab *mp, struct mnttab *mpref);

       int getextmntent(FILE *fp, struct extmnttab *mp, int len);

       char *hasmntopt(struct mnttab *mnt, char *opt);

       int putmntent(FILE *iop, struct mnttab *mp);

       void resetmnttab(FILE *fp);

DESCRIPTION
   getmntent() and getmntany()
       The getmntent() and getmntany() functions each fill  in	the  structure
       pointed	to  by	mp  with the broken-out fields of a line in the mnttab
       file. Each line read from the file contains a mnttab  structure,	 which
       is  defined  in	the  <sys/mnttab.h> header. The structure contains the
       following members, which correspond to the  broken-out  fields  from  a
       line in /etc/mnttab (see mnttab(4)).

	 char	*mnt_special;	  /* name of mounted resource */
	 char	*mnt_mountp;	  /* mount point */
	 char	*mnt_fstype;	  /* type of file system mounted */
	 char	*mnt_mntopts;	  /* options for this mount */
	 char	*mnt_time;	  /* time file system mounted */

       Fields  with  no	 actual	 content in /etc/mnttab are represented in the
       file as "-". To clearly distinguish empty fields, getmntent()  set  the
       corresponding field in mp to NULL.

       Each  getmntent()  call	causes	a  new line to be read from the mnttab
       file. Successive calls can be used to search the entire list. The getm‐
       ntany()	function  searches  the file referenced by fp until a match is
       found between a line in the file and mpref. A match occurs if all  non-
       null  entries  in  mpref	 match	the  corresponding fields in the file.
       These functions do not open, close, or rewind the file.

   getextmntent()
       The getextmntent() function is an extended version of  the  getmntent()
       function	 that returns, in addition to the information that getmntent()
       returns, the major and minor number of the mounted  resource  to	 which
       the  line in mnttab corresponds. The getextmntent() function also fills
       in the extmntent structure defined in the <sys/mnttab.h>	 header.   For
       getextmntent()  to function properly, it must be notified when the mnt‐
       tab file has been reopened or rewound since a  previous	getextmntent()
       call.  This notification is accomplished by calling resetmnttab(). Oth‐
       erwise, it behaves exactly as getmntent() described above

       The data pointed to by the mnttab structure members  are	 stored	 in  a
       static area and must be copied to be saved between successive calls.

   hasmntopt()
       The  hasmntopt()	 function  scans  the mnt_mntopts member of the mnttab
       structure mnt for a substring that matches opt. It returns the  address
       of  the	substring  if  a  match is found; otherwise it returns 0. Sub‐
       strings are delimited by commas and the end of the mnt_mntopts string.

   putmntent()
       The putmntent() function is obsolete and	 no  longer  has  any  effect.
       Entries appear in mnttab as a side effect of a mount(2) call. The func‐
       tion name is still defined for transition purposes.

   resetmnttab()
       The resetmnttab() function notifies getextmntent() to reload  from  the
       kernel  the  device information that corresponds to the new snapshot of
       the mnttab information (see mnttab(4)). Subsequent getextmntent() calls
       then  return  correct  extmnttab	 information.  This function should be
       called whenever the  mnttab  file  is  either  rewound  or  closed  and
       reopened before any calls are made to getextmntent().

RETURN VALUES
   getmntent() and getmntany()
       If  the	next  entry  is successfully read by getmntent() or a match is
       found with getmntany(), 0 is returned.  If an  EOF  is  encountered  on
       reading, these functions return −1. If an error is encountered, a value
       greater than 0 is returned. The following error values are  defined  in
       <sys/mnttab.h>:

       MNT_TOOLONG
		      A	 line in the file exceeded the internal buffer size of
		      MNT_LINE_MAX.

       MNT_TOOMANY
		      A line in the file contains too many fields.

       MNT_TOOFEW
		      A line in the file contains too few fields.

   hasmntopt()
       Upon successful completion, hasmntopt() returns the address of the sub‐
       string if a match is found. Otherwise, it returns 0.

   putmntent()
       The putmntent() is obsolete and always returns −1.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌───────────────┬─────────────────┐
       │ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
       ├───────────────┼─────────────────┤
       │MT-Level       │ Safe		 │
       └───────────────┴─────────────────┘

SEE ALSO
       mount(2), mnttab(4), attributes(5)

				 Mar 22, 2004			 GETMNTENT(3C)
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