115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
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/*
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* Copyright 1993 - 1994, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#ifndef HAVE_GETUTENT
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#include "defines.h"
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#include <stdio.h>
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#include <fcntl.h>
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#include <utmp.h>
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#ifndef lint
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static char rcsid[] = "$Id: utent.c,v 1.4 1998/01/29 23:22:32 marekm Exp $";
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#endif
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static int utmp_fd = -1;
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static struct utmp utmp_buf;
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/*
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* setutent - open or rewind the utmp file
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*/
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void
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setutent(void)
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{
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if (utmp_fd == -1)
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if ((utmp_fd = open (_UTMP_FILE, O_RDWR)) == -1)
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utmp_fd = open (_UTMP_FILE, O_RDONLY);
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if (utmp_fd != -1)
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lseek (utmp_fd, (off_t) 0L, SEEK_SET);
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}
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/*
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* endutent - close the utmp file
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*/
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void
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endutent(void)
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{
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if (utmp_fd != -1)
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close (utmp_fd);
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utmp_fd = -1;
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}
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/*
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* getutent - get the next record from the utmp file
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*/
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struct utmp *
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getutent(void)
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{
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if (utmp_fd == -1)
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setutent ();
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if (utmp_fd == -1)
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return 0;
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if (read (utmp_fd, &utmp_buf, sizeof utmp_buf) != sizeof utmp_buf)
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return 0;
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return &utmp_buf;
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}
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/*
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* getutline - get the utmp entry matching ut_line
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*/
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struct utmp *
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getutline(const struct utmp *utent)
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{
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struct utmp save;
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struct utmp *new;
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save = *utent;
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while (new = getutent ())
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if (strncmp (new->ut_line, save.ut_line, sizeof new->ut_line))
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continue;
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else
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return new;
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return (struct utmp *) 0;
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}
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#else
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extern int errno; /* warning: ANSI C forbids an empty source file */
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#endif
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