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