1 /*
2 * Copyright (c) 2017 Linux Test Project
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms in version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
11 * the GNU General Public License for more details.
12 */
13
14 #ifdef __linux__
15 # include <errno.h>
16 # include <string.h>
tst_process_state_wait3(pid_t pid,const char state,unsigned long maxwait_ms)17 int tst_process_state_wait3(pid_t pid, const char state,
18 unsigned long maxwait_ms)
19 {
20 char proc_path[128], cur_state;
21 int wait_step_ms = 10;
22 unsigned long waited_ms = 0;
23
24 snprintf(proc_path, sizeof(proc_path), "/proc/%i/stat", pid);
25
26 for (;;) {
27 FILE *f = fopen(proc_path, "r");
28
29 if (!f) {
30 fprintf(stderr, "Failed to open '%s': %s\n",
31 proc_path, strerror(errno));
32 return 1;
33 }
34
35 if (fscanf(f, "%*i %*s %c", &cur_state) != 1) {
36 fclose(f);
37 fprintf(stderr, "Failed to read '%s': %s\n",
38 proc_path, strerror(errno));
39 return 1;
40 }
41 fclose(f);
42
43 if (state == cur_state)
44 return 0;
45
46 usleep(wait_step_ms * 1000);
47 waited_ms += wait_step_ms;
48
49 if (waited_ms >= maxwait_ms) {
50 fprintf(stderr, "Reached max wait time\n");
51 return 1;
52 }
53 }
54 }
55 #else
tst_process_state_wait3(pid_t pid,const char state,unsigned long maxwait_ms)56 int tst_process_state_wait3(pid_t pid, const char state,
57 unsigned long maxwait_ms)
58 {
59 usleep(maxwait_ms * 1000);
60 return 0;
61 }
62 #endif
63