1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2022 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
4 */
5
6 #include <stdio.h>
7 #include <unistd.h>
8 #include <string.h>
9 #include <errno.h>
10
11 #include "tst_safe_file_ops.h"
12 #include "tst_process_state.h"
13
tst_thread_state_wait(pid_t tid,const char state,unsigned int msec_timeout)14 int tst_thread_state_wait(pid_t tid, const char state,
15 unsigned int msec_timeout)
16 {
17 char proc_path[128], cur_state;
18 unsigned int msecs = 0;
19
20 snprintf(proc_path, sizeof(proc_path), "/proc/self/task/%i/stat", tid);
21
22 for (;;) {
23 SAFE_FILE_SCANF(proc_path, "%*i %*s %c", &cur_state);
24
25 if (state == cur_state)
26 break;
27
28 usleep(1000);
29 msecs += 1;
30
31 if (msec_timeout && msecs >= msec_timeout) {
32 errno = ETIMEDOUT;
33 return -1;
34 }
35 }
36
37 return 0;
38 }
39