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/*
*
* Copyright (c) International Business Machines Corp., 2009
* Copyright (c) 2014 Oracle and/or its affiliates. All Rights Reserved.
*
* 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 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <fcntl.h>
#include <limits.h>
#include <sys/types.h>
#include "test.h"
#include "tst_pid.h"
#include "old_safe_file_ops.h"
#define PID_MAX_PATH "/proc/sys/kernel/pid_max"
pid_t tst_get_unused_pid_(void (*cleanup_fn) (void))
{
pid_t pid;
SAFE_FILE_SCANF(cleanup_fn, PID_MAX_PATH, "%d", &pid);
return pid;
}
int tst_get_free_pids_(void (*cleanup_fn) (void))
{
FILE *f;
int rc, used_pids, max_pids;
f = popen("ps -eT | wc -l", "r");
if (!f) {
tst_resm(TBROK, "Could not run 'ps' to calculate used " "pids");
return -1;
}
rc = fscanf(f, "%i", &used_pids);
pclose(f);
if (rc != 1 || used_pids < 0) {
tst_resm(TBROK, "Could not read output of 'ps' to "
"calculate used pids");
return -1;
}
SAFE_FILE_SCANF(cleanup_fn, PID_MAX_PATH, "%d", &max_pids);
/* max_pids contains the maximum PID + 1,
* used_pids contains used PIDs + 1,
* so this additional '1' is eliminated by the substraction */
return max_pids - used_pids;
}
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