GETMNTENT(3)GETMNTENT(3)NAME
getmntent, setmntent, addmntent, endmntent, hasmntopt - get file system
descriptor file entry
SYNOPSIS
#include <stdio.h>
#include <mntent.h>
FILE *setmntent(filep, type)
char *filep;
char *type;
struct mntent *getmntent(filep)
FILE *filep;
int addmntent(filep, mnt)
FILE *filep;
struct mntent *mnt;
char *hasmntopt(mnt, opt)
struct mntent *mnt;
char *opt;
int endmntent(filep)
FILE *filep;
DESCRIPTION
These routines replace the getfsent routines for accessing the file
system description file /etc/fstab. They are also used to access the
mounted file system description file /etc/mtab.
Setmntent opens a file system description file and returns a file
pointer which can then be used with getmntent, addmntent, or endmntent.
The type argument is the same as in fopen(3). An argument of NULL
signifies that the standard filesystem table should be searched. That
is, NetInfo is searched if it is running, otherwise /etc/fstab is
searched (if NetInfo is running, setmntent(NULL,type) returns -1).
Getmntent reads the next line from filep and returns a pointer to an
object with the following structure containing the broken-out fields of
a line in the filesystem description file, <mntent.h>. The fields have
meanings described in fstab(5).
struct mntent {
char *mnt_fsname; /* file system name */
char *mnt_dir; /* file system path prefix */
char *mnt_type; /* 4.2, nfs, swap, or xx */
char *mnt_opts; /* ro, quota, etc. */
int mnt_freq; /* dump frequency, in days */
int mnt_passno; /* pass number on parallel fsck */
};
Addmntent adds the mntent structure mnt to the end of the open file
filep. Note that filep has to be opened for writing if this is to
work. Hasmntopt scans the mnt_opts field of the mntent structure mnt
for a substring that matches opt. It returns the address of the
substring if a match is found, 0 otherwise. Endmntent closes the file.
FILES
/etc/fstab
/etc/mtab
SEE ALSOfstab(5), getfsent(3), netinfo(5)DIAGNOSTICS
Null pointer (0) returned on EOF or error.
BUGS
The returned mntent structure points to static information that is
overwritten in each call.
12 March 1985 GETMNTENT(3)