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/* GNU's read utmp module.
Copyright (C) 1992-2001, 2003-2006, 2009-2014 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by jla; revised by djm */
/* extracted for util-linux by ooprala */
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "xalloc.h"
#include "readutmp.h"
/* Read the utmp entries corresponding to file FILE into freshly-
malloc'd storage, set *UTMP_BUF to that pointer, set *N_ENTRIES to
the number of entries, and return zero. If there is any error,
return -1, setting errno, and don't modify the parameters.
If OPTIONS & READ_UTMP_CHECK_PIDS is nonzero, omit entries whose
process-IDs do not currently exist. */
int
read_utmp (char const *file, size_t *n_entries, struct utmp **utmp_buf)
{
size_t n_read = 0;
size_t n_alloc = 0;
struct utmp *utmp = NULL;
struct utmp *u;
/* Ignore the return value for now.
Solaris' utmpname returns 1 upon success -- which is contrary
to what the GNU libc version does. In addition, older GNU libc
versions are actually void. */
utmpname(file);
setutent();
errno = 0;
while ((u = getutent()) != NULL) {
if (n_read == n_alloc) {
n_alloc += 32;
utmp = xrealloc(utmp, n_alloc * sizeof (struct utmp));
if (!utmp)
return -1;
}
utmp[n_read++] = *u;
}
if (!u && errno) {
free(utmp);
return -1;
}
endutent();
*n_entries = n_read;
*utmp_buf = utmp;
return 0;
}
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