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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright (c) 2015-2016 Cyril Hrubis <chrubis@suse.cz>
*/
#ifndef TST_PID_H__
#define TST_PID_H__
#include <sys/types.h>
/*
* Get a pid value not used by the OS
*/
pid_t tst_get_unused_pid_(void (*cleanup_fn)(void));
/*
* Returns number of free pids by subtraction of the number of pids
* currently used ('ps -eT') from maximum number of processes.
* The limit of processes come from kernel pid_max and cgroup session limits
* (e.g. configured by systemd user.slice).
*/
int tst_get_free_pids_(void (*cleanup_fn)(void));
#ifdef TST_TEST_H__
static inline pid_t tst_get_unused_pid(void)
{
return tst_get_unused_pid_(NULL);
}
static inline int tst_get_free_pids(void)
{
return tst_get_free_pids_(NULL);
}
#else
static inline pid_t tst_get_unused_pid(void (*cleanup_fn)(void))
{
return tst_get_unused_pid_(cleanup_fn);
}
static inline int tst_get_free_pids(void (*cleanup_fn)(void))
{
return tst_get_free_pids_(cleanup_fn);
}
#endif
/*
* Direct getpid() syscall. Some glibc versions cache getpid() return value
* which can cause confusing issues for example in processes created by
* direct clone() syscall (without using the glibc wrapper). Use this function
* whenever the current process may be a child of the main test process.
*/
pid_t tst_getpid(void);
#endif /* TST_PID_H__ */
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