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 #include <time.h>
15
16 #include "posixtest.h"
17
18 #ifdef __linux__
19 # include <errno.h>
20 # include <string.h>
21
tst_process_state_wait3(pid_t pid,const char state,long maxwait_s)22 int tst_process_state_wait3(pid_t pid, const char state,
23 long maxwait_s)
24 {
25 char proc_path[128], cur_state;
26 int wait_step_ms = 10;
27 struct timespec wait_step_ts;
28 long iteration, max_iterations = (maxwait_s * 1000) / wait_step_ms;
29
30 wait_step_ts.tv_sec = 0;
31 wait_step_ts.tv_nsec = wait_step_ms * 1000000;
32
33 snprintf(proc_path, sizeof(proc_path), "/proc/%i/stat", pid);
34
35 for (iteration = 0; iteration < max_iterations; iteration++) {
36 FILE *f = fopen(proc_path, "r");
37
38 if (!f) {
39 fprintf(stderr, "Failed to open '%s': %s\n",
40 proc_path, strerror(errno));
41 return 1;
42 }
43
44 if (fscanf(f, "%*i %*s %c", &cur_state) != 1) {
45 fclose(f);
46 fprintf(stderr, "Failed to read '%s': %s\n",
47 proc_path, strerror(errno));
48 return 1;
49 }
50 fclose(f);
51
52 if (state == cur_state)
53 return 0;
54
55 nanosleep(&wait_step_ts, NULL);
56 }
57 fprintf(stderr, "Reached max wait time\n");
58 return 1;
59 }
60 #else
tst_process_state_wait3(pid_t pid LTP_ATTRIBUTE_UNUSED,const char state LTP_ATTRIBUTE_UNUSED,long maxwait_s)61 int tst_process_state_wait3(pid_t pid LTP_ATTRIBUTE_UNUSED,
62 const char state LTP_ATTRIBUTE_UNUSED, long maxwait_s)
63 {
64 struct timespec maxwait_ts;
65
66 maxwait_ts.tv_sec = maxwait_s;
67 maxwait_ts.tv_nsec = 0;
68
69 nanosleep(&maxwait_ts, NULL);
70 return 0;
71 }
72 #endif
73