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Diffstat (limited to '')
-rw-r--r-- | lib/utent.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/lib/utent.c b/lib/utent.c new file mode 100644 index 0000000..45af260 --- /dev/null +++ b/lib/utent.c @@ -0,0 +1,93 @@ +/* + * Copyright (c) 1993 - 1994, Julianne Frances Haugh + * Copyright (c) 1996 - 1998, Marek Michałkiewicz + * Copyright (c) 2005 , Tomasz Kłoczko + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the copyright holders or contributors may not be used to + * endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <config.h> + +#ifndef HAVE_GETUTENT + +#include "defines.h" +#include <stdio.h> +#include <fcntl.h> +#include <utmp.h> + +#ifndef lint +static char rcsid[] = "$Id$"; +#endif + +static int utmp_fd = -1; +static struct utmp utmp_buf; + +/* + * setutent - open or rewind the utmp file + */ + +void setutent (void) +{ + if (utmp_fd == -1) + if ((utmp_fd = open (_UTMP_FILE, O_RDWR)) == -1) + utmp_fd = open (_UTMP_FILE, O_RDONLY); + + if (utmp_fd != -1) + lseek (utmp_fd, (off_t) 0L, SEEK_SET); +} + +/* + * endutent - close the utmp file + */ + +void endutent (void) +{ + if (utmp_fd != -1) + close (utmp_fd); + + utmp_fd = -1; +} + +/* + * getutent - get the next record from the utmp file + */ + +struct utmp *getutent (void) +{ + if (utmp_fd == -1) + setutent (); + + if (utmp_fd == -1) + return 0; + + if (read (utmp_fd, &utmp_buf, sizeof utmp_buf) != sizeof utmp_buf) + return 0; + + return &utmp_buf; +} +#else +extern int errno; /* warning: ANSI C forbids an empty source file */ +#endif |