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> 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 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
