getprtcent(S)

getprtcent, getprtcnam, setprtcent, endprtcent, putprtcnam -- manipulate terminal control database entry

Syntax

cc . . . -lprot -lx

#include <sys/types.h>
#include <sys/security.h>
#include <sys/audit.h>
#include <prot.h>

struct pr_term *getprtcent ()

struct pr_term *getprtcnam (name)
char *name;

void setprtcent ()

void endprtcent ()

int putprtcnam (name, pr)
char *name;
struct pr_term *pr;

Description

The getprtcent and getprtcnam routines both return a pointer to an object with the following structure containing the broken-out fields of a line in the terminal control database. Only entries in the database dealing with users are scanned.
Each line in the database contains a pr_term structure, declared in the <prot.h> header file:

   struct        pr_term  {
           struct t_field ufld;
           struct t_flag uflg;
           struct t_field sfld;
           struct t_flag sflg;
   };
   
   struct        t_field  {
           char        fd_devname[12]; /* Same size as utmp entry */
           ushort      fd_uid;         /* uid of last successful login */
           time_t      fd_slogin;      /* time stamp of   "        "   */
           ushort      fd_uuid;        /* uid of last unsuccessful login */
           time_t      fd_ulogin;      /* time stamp of  "           "   */
           ushort      fd_loutuid;     /* uid of last logout */
           time_t      fd_louttime;    /* time stamp of   "    */
           ushort      fd_nlogins;     /* consecutive failed attempts */
           ushort      fd_max_tries;   /* max unsuc login tries allowed */
           time_t      fd_logdelay;    /* delay between login tries */
           char        fd_label[AUTH_TLSIZ];/* terminal label */
           char        fd_lock;        /* terminal locked? */
           ushort      fd_login_timeout; /* login timeout in seconds */
   };
   

   struct        t_flag  {
           unsigned
                   fg_devname:1,        /* Is fd_devname set? */
                   fg_uid:1,            /* Is fd_uid set? */
                   fg_slogin:1,         /* Is fd_stime set? */
                   fg_uuid:1,           /* Is fd_uuid set? */
                   fg_ulogin:1,         /* Is fd_ftime set? */
                   fg_loutuid:1,        /* Is fd_loutuid set? */
                   fg_louttime:1,       /* Is fd_louttime set? */
                   fg_nlogins:1,        /* Is fd_nlogins set? */
                   fg_max_tries:1,      /* Is fd_max_tries set? */
                   fg_logdelay:1,       /* Is fd_logdelay set? */
                   fg_label:1,          /* Is fd_label set? */
                   fg_lock:1,           /* Is fd_lock set? */
                   fg_login_timeout:1;  /* Is fd_login_timeout valid? */
   };

Because these structures are declared in <prot.h>, they need not be redeclared.

When the getprtcent routine is first called, it returns a pointer to the first user pr_term structure in the database. Thereafter, it returns a pointer to the next pr_term structure in the database. So, successive calls can be used to search the entire database.

The getprtcnam routine searches from the beginning of the database file until a login name matching the argument name is found. getprtcnam returns a pointer to the particular pr_term structure in which the argument name was found.

The setprtcent routine resets the file pointer to the beginning of the terminal control file to allow repeated searches. The endprtcent routine closes the terminal control file when processing is complete.

The putprtcnam routine puts a new or replaced terminal control entry pr with key name into the terminal control file. If the uflg.fg_name member is 0, the requested entry is deleted from the terminal control database. The putprtcnam routine locks the database for all update operations, and performs an endprtcent after the update or failed attempt.

Return value

Upon successful completion, the getprtcent and getprtcnam routines each returns a pointer to a pr_term structure. The putprtcnam routine returns a non-zero value on a successful substitution, deletion, or addition and a value of zero upon failure. If an end-of-file or an error is encountered on reading, these functions return a NULL pointer. No errors are defined for the setprtcent or endprtcent routines.

Diagnostics

Use feof( ) to test if a null return value is caused by an end-of-file or from a syntax error in the terminal control file. The feof macro is described in the ferror(S) manual page.

Note

All information is contained in a static area, so it must be copied if it is to be saved. Otherwise, it may be overwritten on subsequent calls to these routines.

Files

/etc/auth/system/ttys

Standards conformance

endprtcent, getprtcent, getprtcnam, putprtcnam and setprtcent are not part of any currently supported standard; they are an extension of AT&T System V provided by the Santa Cruz Operation.