71 lines
1.2 KiB
C
71 lines
1.2 KiB
C
/*
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* SPDX-FileCopyrightText: 1993 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2005 , Tomasz Kłoczko
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*
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* SPDX-License-Identifier: BSD-3-Clause
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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[] = "$Id$";
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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 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 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 *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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#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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