GETVFSENT(3C) Standard C Library Functions GETVFSENT(3C)

NAME

getvfsent, getvfsfile, getvfsspec, getvfsany - get vfstab file entry

SYNOPSIS

#include <stdio.h>
#include <sys/vfstab.h>

int getvfsent(FILE *fp, struct vfstab *vp);


int getvfsfile(FILE *fp, struct vfstab *vp, char *file);


int getvfsspec(FILE *, struct vfstab *vp, char *spec);


int getvfsany(FILE *, struct vfstab *vp, struct vfstab *vref);

DESCRIPTION

The getvfsent(), getvfsfile(), getvfsspec(), and getvfsany()
functions each fill in the structure pointed to by vp with the
broken-out fields of a line in the /etc/vfstab file. Each line in the
file contains a vfstab structure, declared in the <sys/vfstab.h>
header, whose following members are described on the vfstab(5) manual
page:

char *vfs_special;
char *vfs_fsckdev;
char *vfs_mountp;
char *vfs_fstype;
char *vfs_fsckpass;
char *vfs_automnt;
char *vfs_mntopts;


The getvfsent() function returns a pointer to the next vfstab
structure in the file; so successive calls can be used to search the
entire file.


The getvfsfile() function searches the file referenced by fp until a
mount point matching file is found and fills vp with the fields from
the line in the file.


The getvfsspec() function searches the file referenced by fp until a
special device matching spec is found and fills vp with the fields
from the line in the file. The spec argument will try to match on
device type (block or character special) and major and minor device
numbers. If it cannot match in this manner, then it compares the
strings.


The getvfsany() function searches the file referenced by fp until a
match is found between a line in the file and vref. A match occurs if
all non-null entries in vref match the corresponding fields in the
file.


Note that these functions do not open, close, or rewind the file.

RETURN VALUES

If the next entry is successfully read by getvfsent() or a match is
found with getvfsfile(), getvfsspec(), or getvfsany(), 0 is returned.
If an end-of-file is encountered on reading, these functions return
-1. If an error is encountered, a value greater than 0 is returned.
The possible error values are:

VFS_TOOLONG
A line in the file exceeded the internal buffer size
of VFS_LINE_MAX.


VFS_TOOMANY
A line in the file contains too many fields.


VFS_TOOFEW
A line in the file contains too few fields.

FILES

/etc/vfstab

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | Safe |
+---------------+-----------------+

SEE ALSO

vfstab(5), attributes(7)

NOTES

The members of the vfstab structure point to information contained in
a static area, so it must be copied if it is to be saved.

November 26, 2017 GETVFSENT(3C)