getmnt man page on Ultrix

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getmnt(2)							     getmnt(2)

       getmnt - get information about mounted file systems

       #include <sys/types.h>
       #include <sys/param.h>
       #include <sys/mount.h>

       getmnt(start, buffer, nbytes, mode, path)
       int *start;
       struct fs_data *buffer;
       int  nbytes, mode;
       char  *path;

       The system call retrieves information about mounted file systems.

       The mode argument is one of the following: or

       If  mode	 is or then path is the name of a single file system for which
       information is desired, start and nbytes are  ignored,  and  buffer  is
       assumed to be large enough to hold one structure.

       If  mode is or then path is ignored.  The start argument is the current
       logical location within the internal system mount  table	 and  must  be
       initially  set  to The start argument is updated to reflect the current
       logical location within the system  mount  table,  allowing  successive
       executions  of  to retrieve information about all the mounted file sys‐
       tems.  The nbytes argument defines the size of buffer, into  which  the
       file  system  information is returned.  Buffer sizes must be a multiple
       of bytes.  Larger buffer sizes allow information	 about	multiple  file
       systems to be returned.

       If  mode	 is or then dynamic information (the number of free inodes and
       the number of free blocks) could be out of date, but  these  calls  are
       guaranteed  to  return.	 The  file system information in memory is not

       If mode is or then the file system information in  memory  is  updated.
       However,	 if  the  server  of  any file system for which information is
       being retrieved is down, then these calls will hang  until  the	server

       When  information about multiple file systems is returned, it is stored
       within consecutive buffer locations.  The  information  for  each  file
       system is described by the structure
       struct fs_data {
	    struct    fs_data_req    fd_req;   /* required data */
	    u_int     fd_spare[113];	  /* spare */
       };   /* 2560 bytes */

       struct fs_data_req {    /* required part for all file systems */
	    u_int     flags;	/* how mounted */
	    u_int     mtsize;	/* max transfer size in bytes */
	    u_int     otsize;	/* optimal transfer size in bytes */
	    u_int     bsize;	/* fs block size in bytes for vm code */
	    u_int     fstype;	/* see ../h/fs_types.h	*/
	    u_int     gtot;	/* total number of gnodes */
	    u_int     gfree;	/* # of free gnodes */
	    u_int     btot;	/* total number of 1K blocks */
	    u_int     bfree;	/* # of free 1K blocks */
	    u_int     bfreen;	/* user consumable 1K blocks */
	    u_int     pgthresh; /* min size in bytes before paging*/
	    int	 uid;	   /* uid that mounted me */
	    dev_t     dev;	/* major/minor of fs */
	    dev_t     pad;	/* alignment: dev_t is a short*/
	    char devname[MAXPATHLEN + 4];  /* name of dev */
	    char path[MAXPATHLEN + 4];	   /* name of mount point */

Return Values
       Upon successful completion, a value indicating the number of structures
       stored in buffer is returned.  If the file system is not mounted	 (mode
       is  or or there are no more file systems in the mount table (mode is or
       is returned.  Otherwise, is returned and the global variable  errno  is
       set to indicate the error.

       [ENOTDIR]	 A  component  of  the	path  prefix  of path is not a

       [EINVAL]		 Invalid argument.

       [ENAMETOOLONG]	 The length of a component of path exceeds 255 charac‐
			 ters, or the length of path exceeds 1023 characters.

       [ENOENT]		 The file referred to by path does not exist.

       [EACCESS]	 Search	 permission  is	 denied for a component of the
			 path prefix of path.

       [ELOOP]		 Too many symbolic links were encountered in translat‐
			 ing path.

       [EFAULT]		 Either	 buffer	 or start causes an illegal address to
			 be referenced.

       [EIO]		 An I/O error occurred while  reading  from  the  file

See Also


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