getmntent(3C)						   Standard C Library Functions 					     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 getmn-
       tany()  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  getmn-
       tent()  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  mnttab  file	has  been  reopened or rewound since a previous getextmntent() call.  This notification is accomplished by calling
       resetmnttab(). Otherwise, 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. Substrings 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 substring 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)

SunOS 5.11							    22 Mar 2004 						     getmntent(3C)