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util-linux/lib/caputils.c

45 lines
1.1 KiB

/*
* 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 2, 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include "caputils.h"
#include "pathnames.h"
int cap_last_cap(void)
{
/* CAP_LAST_CAP is untrustworthy. */
static int ret = -1;
int matched;
FILE *f;
if (ret != -1)
return ret;
f = fopen(_PATH_PROC_CAPLASTCAP, "r");
if (!f) {
ret = CAP_LAST_CAP; /* guess */
return ret;
}
matched = fscanf(f, "%d", &ret);
fclose(f);
if (matched != 1)
ret = CAP_LAST_CAP; /* guess */
return ret;
}