7b4c7a681c
Break libblkid into 4 libraries: libblkid, libuuid, libutil-linux and libfdisk. This should help in later patch updates. Change-Id: I680d9a7feb031e5c29a603e9c58aff4b65826262
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/* GNU's read utmp module.
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Copyright (C) 1992-2001, 2003-2006, 2009-2014 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by jla; revised by djm */
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/* extracted for util-linux by ooprala */
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#include <errno.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "xalloc.h"
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#include "readutmp.h"
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/* Read the utmp entries corresponding to file FILE into freshly-
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malloc'd storage, set *UTMP_BUF to that pointer, set *N_ENTRIES to
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the number of entries, and return zero. If there is any error,
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return -1, setting errno, and don't modify the parameters.
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If OPTIONS & READ_UTMP_CHECK_PIDS is nonzero, omit entries whose
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process-IDs do not currently exist. */
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int
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read_utmp (char const *file, size_t *n_entries, struct utmp **utmp_buf)
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{
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size_t n_read = 0;
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size_t n_alloc = 0;
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struct utmp *utmp = NULL;
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struct utmp *u;
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/* Ignore the return value for now.
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Solaris' utmpname returns 1 upon success -- which is contrary
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to what the GNU libc version does. In addition, older GNU libc
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versions are actually void. */
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utmpname(file);
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setutent();
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errno = 0;
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while ((u = getutent()) != NULL) {
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if (n_read == n_alloc) {
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n_alloc += 32;
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utmp = xrealloc(utmp, n_alloc * sizeof (struct utmp));
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if (!utmp)
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return -1;
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}
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utmp[n_read++] = *u;
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}
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if (!u && errno) {
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free(utmp);
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return -1;
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}
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endutent();
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*n_entries = n_read;
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*utmp_buf = utmp;
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return 0;
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}
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