int read_file(char *filepath, int action, unsigned int *value) { int num_line = 0; FILE *fp; switch (action) { case GET_SHARES: *value = read_shares_file(filepath); if (*value == -1) return -1; break; case GET_TASKS: fp = fopen (filepath, "r"); if (fp == NULL) error_function("Could not open file", filepath); while (fgets(target, LINE_MAX, fp) != NULL) num_line++; *value = (unsigned int)num_line; if (fclose (fp)) error_function ("Could not close file", filepath); break; default: error_function("Wrong action type passed to fun read_file for ", filepath); break; } return 0; }
int main(int argc, char* argv[]) { int test_num; int task_num; int len; int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */ char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; char mysharesfile[FILENAME_MAX], ch; /* Following variables are to capture parameters from script*/ char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p, *task_num_p; gid_t mygroup_num; /* A number attached with a group*/ int fd; /* A descriptor to open a fifo for synchronized start*/ int counter =0; /* To take n number of readings*/ double total_cpu_time, /* Accumulated cpu time*/ delta_cpu_time, /* Time the task could run on cpu(s) (in an interval)*/ prev_cpu_time=0; double exp_cpu_time; /* Expected time in % as obtained by shares calculation */ struct rusage cpu_usage; unsigned long int mygroup_shares; time_t current_time, prev_time, delta_time; unsigned int fmyshares, num_tasks;/* f-> from file. num_tasks is tasks in this group*/ struct sigaction newaction, oldaction; mygroup_num = -1; num_cpus = 0; task_num = 0; test_num = 0; /* Signal handling for alarm*/ sigemptyset (&newaction.sa_mask); newaction.sa_handler = signal_handler_alarm; newaction.sa_flags=0; sigaction (SIGALRM, &newaction, &oldaction); /* Collect the parameters passed by the script */ group_num_p = getenv("GROUP_NUM"); mygroup_p = getenv("MYGROUP"); script_pid_p = getenv("SCRIPT_PID"); num_cpus_p = getenv("NUM_CPUS"); test_num_p = getenv("TEST_NUM"); task_num_p = getenv("TASK_NUM"); /* Check if all of them are valid */ if ((test_num_p != NULL) && (((test_num =atoi(test_num_p)) <= 10) && ((test_num =atoi(test_num_p)) >= 9))) { if ((group_num_p != NULL) && (mygroup_p != NULL) && \ (script_pid_p != NULL) && (num_cpus_p != NULL) && (task_num_p != NULL)) { mygroup_num = atoi(group_num_p); scriptpid = atoi(script_pid_p); num_cpus = atoi (num_cpus_p); task_num = atoi (task_num_p); sprintf(mygroup,"%s", mygroup_p); } else { tst_brkm (TBROK, cleanup, "Invalid other input parameters\n"); } } else { tst_brkm (TBROK, cleanup, "Invalid test number passed\n"); } /* * Let us give the default group 100 shares, as other groups will have * a multiple of 100 shares. * WARN: For large num of groups this may hit MAX_SHARES */ mygroup_shares = mygroup_num * 100; sprintf(mytaskfile, "%s", mygroup); strcat (mytaskfile,"/tasks"); sprintf(mysharesfile, "%s", mygroup); strcat (mysharesfile,"/cpu.shares"); /* Need some technique so as only 1 task per grp writes to shares file */ if (test_num == 9) write_to_file (mysharesfile, "w", mygroup_shares); /* Write the shares of the group*/ write_to_file (mytaskfile, "a", getpid()); /* Assign the task to it's group*/ fd = open ("./myfifo", 0); if (fd == -1) { tst_brkm (TBROK, cleanup, "Could not open fifo for synchronization"); } read (fd, &ch, 1); /* To block all tasks here and fire them up at the same time*/ /* * We now calculate the expected % cpu time of this task by getting * it's group's shares, the total shares of all the groups and the * number of tasks in this group. */ FLAG = 0; total_shares = 0; shares_pointer = &total_shares; len = strlen (path); if (!strncpy (fullpath, path, len)) tst_brkm (TBROK, cleanup, "Could not copy directory path %s ", path); if (scan_shares_files(shares_pointer) != 0) tst_brkm (TBROK, cleanup, "From function scan_shares_files in %s ", fullpath); /* return val: -1 in case of function error, else 2 is min share value */ if ((fmyshares = read_shares_file(mysharesfile)) < 2) tst_brkm (TBROK, cleanup, "in reading shares files %s ", mysharesfile); if ((read_file (mytaskfile, GET_TASKS, &num_tasks)) < 0) tst_brkm (TBROK, cleanup, "in reading tasks files %s ", mytaskfile); exp_cpu_time = (double)(fmyshares * 100) /(total_shares * num_tasks); prev_time = time (NULL); /* Note down the time*/ while (1) { /* Need to run some cpu intensive task, which also frequently checks the timer value*/ double f = 274.345, mytime; /*just a float number to take sqrt*/ alarm (TIME_INTERVAL); timer_expired = 0; while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL*/ f = sqrt (f*f); /* Time of this operation should not be high otherwise we can * exceed the TIME_INTERVAL to measure cpu usage */ current_time = time (NULL); delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL*/ getrusage (0, &cpu_usage); total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time*/ cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6) ; /* system time*/ delta_cpu_time = total_cpu_time - prev_cpu_time; prev_cpu_time = total_cpu_time; prev_time = current_time; /* calculate % cpu time each task gets */ if (delta_time > TIME_INTERVAL) mytime = (delta_cpu_time * 100) / (delta_time * num_cpus); else mytime = (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus); fprintf (stdout,"Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%) exp:-%6.2f(%%)}\ with %3u shares in %lu (s) INTERVAL\n",mygroup_num, task_num, delta_cpu_time, mytime,\ exp_cpu_time, fmyshares, delta_time); counter++; if (counter >= NUM_INTERVALS) /* Take n sets of readings for each shares value*/ { switch (test_num) { case 9: /* Test 09 */ exit (0); /* This task is done with its job*/ break; case 10: /* Test 10 */ exit (0); /* This task is done with its job*/ break; default: tst_brkm (TBROK, cleanup, "Invalid test number passed\n"); break; } /* end switch*/ } /* end if*/ } /* end while*/ } /* end main*/
int main(int argc, char *argv[]) { int test_num, task_num, len, num_cpus; char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; char mysharesfile[FILENAME_MAX], ch; /* Following variables are to capture parameters from script */ char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p; char *test_num_p, *task_num_p; pid_t pid; gid_t mygroup_num; /* A number attached with a group */ int fd; /* to open a fifo to synchronize */ int counter = 0; /* To take n number of readings */ double total_cpu_time, /* Accumulated cpu time */ delta_cpu_time, /* Time the task could run on cpu(s) */ prev_cpu_time = 0; double exp_cpu_time; /* Exp time in % by shares calculation */ struct rusage cpu_usage; time_t current_time, prev_time, delta_time; unsigned int fmyshares, num_tasks; struct sigaction newaction, oldaction; mygroup_num = -1; num_cpus = 0; task_num = 0; test_num = 0; /* Signal handling for alarm */ sigemptyset(&newaction.sa_mask); newaction.sa_handler = signal_handler_alarm; newaction.sa_flags = 0; sigaction(SIGALRM, &newaction, &oldaction); /* Collect the parameters passed by the script */ group_num_p = getenv("GROUP_NUM"); mygroup_p = getenv("MYGROUP"); script_pid_p = getenv("SCRIPT_PID"); num_cpus_p = getenv("NUM_CPUS"); test_num_p = getenv("TEST_NUM"); task_num_p = getenv("TASK_NUM"); /* Check if all of them are valid */ if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 8) && ((test_num = atoi(test_num_p)) >= 6))) { if ((group_num_p != NULL) && (mygroup_p != NULL) && (script_pid_p != NULL) && (num_cpus_p != NULL) && (task_num_p != NULL)) { mygroup_num = atoi(group_num_p); scriptpid = atoi(script_pid_p); num_cpus = atoi(num_cpus_p); task_num = atoi(task_num_p); sprintf(mygroup, "%s", mygroup_p); } else { tst_brkm(TBROK, cleanup, "Invalid other input parameters\n"); } } else { tst_brkm(TBROK, cleanup, "Invalid test number passed\n"); } sprintf(mytaskfile, "%s", mygroup); sprintf(mysharesfile, "%s", mygroup); strcat(mytaskfile, "/tasks"); strcat(mysharesfile, "/cpu.shares"); pid = getpid(); write_to_file(mytaskfile, "a", pid); /* Assign task to it's group */ fd = open("./myfifo", 0); if (fd == -1) tst_brkm(TBROK, cleanup, "Could not open fifo synchronize"); read(fd, &ch, 1); /* Block task here to synchronize */ /* * We need not calculate the expected % cpu time of this task, as * neither it is required nor it can be predicted as there are idle * system tasks (and others too) in this group. */ FLAG = 0; total_shares = 0; shares_pointer = &total_shares; len = strlen(path); if (!strncpy(fullpath, path, len)) tst_brkm(TBROK, cleanup, "Could not copy directory path %s ", path); if (scan_shares_files(shares_pointer) != 0) tst_brkm(TBROK, cleanup, "From function scan_shares_files in %s ", fullpath); /* return val -1 in case of function error, else 2 is min share value */ if ((fmyshares = read_shares_file(mysharesfile)) < 2) tst_brkm(TBROK, cleanup, "in reading shares files %s ", mysharesfile); if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) tst_brkm(TBROK, cleanup, "in reading tasks files %s ", mytaskfile); exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); prev_time = time(NULL); /* Note down the time */ while (1) { /* * Need to run some cpu intensive task, which also * frequently checks the timer value */ double f = 274.345, mytime; /*just a float number for sqrt */ alarm(TIME_INTERVAL); timer_expired = 0; /* * Let the task run on cpu for TIME_INTERVAL. Time of this * operation should not be high otherwise we can exceed the * TIME_INTERVAL to measure cpu usage */ while (!timer_expired) f = sqrt(f * f); current_time = time(NULL); /* Duration in case its not exact TIME_INTERVAL */ delta_time = current_time - prev_time; getrusage(0, &cpu_usage); /* total_cpu_time = total user time + total sys time */ total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); delta_cpu_time = total_cpu_time - prev_cpu_time; prev_cpu_time = total_cpu_time; prev_time = current_time; /* calculate % cpu time each task gets */ if (delta_time > TIME_INTERVAL) mytime = (delta_cpu_time * 100) / (delta_time * num_cpus); else mytime = (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus); /* No neeed to print the results */ fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)" " i.e. %6.2f(%%) exp:-%6.2f(%%)} in %lu (s)\n", mygroup_num, task_num, delta_cpu_time, mytime, exp_cpu_time, delta_time); counter++; if (counter >= NUM_INTERVALS) { switch (test_num) { case 6: /* Test 06 */ case 7: /* Test 07 */ case 8: /* Test 08 */ exit(0); /* This task is done */ break; default: tst_brkm(TBROK, cleanup, "Invalid test num passed\n"); break; } /* end switch */ } /* end if */ } /* end while */ } /* end main */
int main(int argc, char *argv[]) { int num_cpus, test_num, len; /* Total time = TIME_INTERVAL*num_cpus*/ char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; char mysharesfile[FILENAME_MAX], ch; pid_t pid; int my_group_num; /* A number attached with a group*/ int fd; /* To open a fifo for synchronization*/ int first_counter = 0; /* To take n number of readings*/ int second_counter = 0; /* no of times shares have changed*/ double total_cpu_time; /* Accumulated cpu time*/ double delta_cpu_time; /* Time the task could run on cpu(s)*/ double prev_cpu_time = 0; double exp_cpu_time; /* Exp time in % by shares calculation*/ struct rusage cpu_usage; time_t current_time, prev_time, delta_time; unsigned long int myshares = 2, baseshares = 1000; unsigned int fmyshares, num_tasks; struct sigaction newaction, oldaction; num_cpus = 0; test_num = 0; my_group_num = -1; /* Signal handling for alarm*/ sigemptyset(&newaction.sa_mask); newaction.sa_handler = signal_handler_alarm; newaction.sa_flags = 0; sigaction(SIGALRM, &newaction, &oldaction); /* Check if all parameters passed are correct*/ if ((argc < 5) || ((my_group_num = atoi(argv[1])) <= 0) || \ ((scriptpid = atoi(argv[3])) <= 0) || \ ((num_cpus = atoi(argv[4])) <= 0) || \ (test_num = atoi(argv[5])) <= 0) tst_brkm(TBROK, cleanup, "Invalid input parameters\n"); if (test_num == 1) myshares *= my_group_num; else if (test_num == 3) myshares = baseshares; else tst_brkm(TBROK, cleanup, "Wrong Test num passed. Exiting.\n"); sprintf(mygroup, "%s", argv[2]); sprintf(mytaskfile, "%s", mygroup); sprintf(mysharesfile, "%s", mygroup); strcat(mytaskfile, "/tasks"); strcat(mysharesfile, "/cpu.shares"); pid = getpid(); write_to_file(mytaskfile, "a", pid); /* Assign task to it's group*/ write_to_file(mysharesfile, "w", myshares); dbg("Default task's initial shares = %u", myshares); fd = open("./myfifo", 0); if (fd == -1) tst_brkm(TBROK, cleanup, "Could not open fifo to synchronizae"); read(fd, &ch, 1); /* To fire all the tasks up at the same time*/ /* * We need not calculate the expected % cpu time of this task, as * neither it is required nor it can be predicted as there are idle * system tasks (and others too) in this group. */ FLAG = 0; total_shares = 0; shares_pointer = &total_shares; len = strlen(path); if (!strncpy(fullpath, path, len)) tst_brkm(TBROK, cleanup, "Could not copy directory path %s ", path); if (scan_shares_files(shares_pointer) != 0) tst_brkm(TBROK, cleanup, "From function scan_shares_files in %s ", fullpath); /* return val -1 in case of function error, else 2 is min share value */ if ((fmyshares = read_shares_file(mysharesfile)) < 2) tst_brkm(TBROK, cleanup, "in reading shares files %s ", mysharesfile); if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) tst_brkm(TBROK, cleanup, "in reading tasks files %s ", mytaskfile); exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); prev_time = time(NULL); /* Note down the time*/ while (1) { /* * Need to run some cpu intensive task, which also * frequently checks the timer value */ double f = 274.345, mytime; /*just a float number for sqrt*/ alarm(TIME_INTERVAL); timer_expired = 0; /* * Let the task run on cpu for TIME_INTERVAL. Time of this * operation should not be high otherwise we can exceed the * TIME_INTERVAL to measure cpu usage */ while (!timer_expired) f = sqrt(f * f); current_time = time(NULL); /* Duration in case its not exact TIME_INTERVAL*/ delta_time = current_time - prev_time; getrusage(0, &cpu_usage); /* total_cpu_time = total user time + total sys time */ total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6) ; delta_cpu_time = total_cpu_time - prev_cpu_time; prev_cpu_time = total_cpu_time; prev_time = current_time; /* calculate % cpu time each task gets */ if (delta_time > TIME_INTERVAL) mytime = (delta_cpu_time * 100) / (delta_time * num_cpus); else mytime = (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus); /* * Lets print the results. The exp cpu time calculated may not * be correct due to running system tasks at the moment */ fprintf(stdout, "DEF TASK:CPU TIME{calc:-%6.2f(s)" " i.e. %6.2f(%%) exp:-%6.2f(%%)} with %lu(shares)" " in %lu (s) INTERVAL\n", delta_cpu_time, mytime, exp_cpu_time, myshares, delta_time); first_counter++; /* Take n sets of readings for each shares value*/ if (first_counter >= NUM_INTERVALS) { first_counter = 0; second_counter++; if (second_counter >= NUM_SETS) exit(0); /* This task is done */ /* Keep same ratio but change values*/ if (test_num == 1) { myshares = MULTIPLIER * myshares; write_to_file(mysharesfile, "w", myshares); } /* No need to change shares for def task for test 3 */ }/* end if*/ }/* end while*/ }/* end main*/
int main(int argc, char *argv[]) { int num_cpus; int test_num; int len; /* Total time = TIME_INTERVAL *num_cpus in the machine */ char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; char mysharesfile[FILENAME_MAX], ch; pid_t pid; gid_t my_group_num; /* A number attached with a group */ int fd; /* A descriptor to open a fifo for synchronized start */ int first_counter = 0; /* To take n number of readings */ int second_counter = 0; /* To track number of times the base value of shares has been changed */ double total_cpu_time, /* Accumulated cpu time */ delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */ prev_cpu_time = 0; double exp_cpu_time; /* Expected time in % as obtained by shares calculation */ struct rusage cpu_usage; time_t current_time, prev_time, delta_time; unsigned long int myshares = 2, baseshares = 1000; /* Simply the base value to start with */ unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */ struct sigaction newaction, oldaction; my_group_num = -1; num_cpus = 0; test_num = 0; /* Signal handling for alarm */ sigemptyset(&newaction.sa_mask); newaction.sa_handler = signal_handler_alarm; newaction.sa_flags = 0; sigaction(SIGALRM, &newaction, &oldaction); /* Check if all parameters passed are correct */ if ((argc < 5) || ((my_group_num = atoi(argv[1])) <= 0) || ((scriptpid = atoi(argv[3])) <= 0) || ((num_cpus = atoi(argv[4])) <= 0) || (test_num = atoi(argv[5])) <= 0) { tst_brkm(TBROK, cleanup, "Invalid input parameters\n"); } if (test_num == 1) /* Test 01 & Test 02 */ myshares *= my_group_num; else if (test_num == 3) /* Test 03 */ myshares = baseshares; else { tst_brkm(TBROK, cleanup, "Wrong Test number passed. Exiting Test...\n"); } sprintf(mygroup, "%s", argv[2]); sprintf(mytaskfile, "%s", mygroup); sprintf(mysharesfile, "%s", mygroup); strcat(mytaskfile, "/tasks"); strcat(mysharesfile, "/cpu.shares"); pid = getpid(); write_to_file(mytaskfile, "a", pid); /* Assign the task to it's group */ write_to_file(mysharesfile, "w", myshares); fd = open("./myfifo", 0); if (fd == -1) { tst_brkm(TBROK, cleanup, "Could not open fifo for synchronization"); } fprintf(stdout, "\ntask-%d SHARES=%lu\n", my_group_num, myshares); read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */ /* * We now calculate the expected % cpu time of this task by getting * it's group's shares, the total shares of all the groups and the * number of tasks in this group. */ FLAG = 0; total_shares = 0; shares_pointer = &total_shares; len = strlen(path); if (!strncpy(fullpath, path, len)) tst_brkm(TBROK, cleanup, "Could not copy directory path %s ", path); if (scan_shares_files(shares_pointer) != 0) tst_brkm(TBROK, cleanup, "From function scan_shares_files in %s ", fullpath); /* return val: -1 in case of function error, else 2 is min share value */ if ((fmyshares = read_shares_file(mysharesfile)) < 2) tst_brkm(TBROK, cleanup, "in reading shares files %s ", mysharesfile); if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) tst_brkm(TBROK, cleanup, "in reading tasks files %s ", mytaskfile); exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); prev_time = time(NULL); /* Note down the time */ while (1) { /* Need to run some cpu intensive task, which also frequently checks the timer value */ double f = 274.345, mytime; /*just a float number to take sqrt */ alarm(TIME_INTERVAL); timer_expired = 0; while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */ f = sqrt(f * f); /* Time of this operation should not be high otherwise we can * exceed the TIME_INTERVAL to measure cpu usage */ current_time = time(NULL); delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */ getrusage(0, &cpu_usage); total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /*user */ cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /*sys */ delta_cpu_time = total_cpu_time - prev_cpu_time; prev_cpu_time = total_cpu_time; prev_time = current_time; /* calculate % cpu time each task gets */ if (delta_time > TIME_INTERVAL) mytime = (delta_cpu_time * 100) / (delta_time * num_cpus); else mytime = (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus); fprintf(stdout, "task-%d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%) exp:-%6.2f(%%)}\ with %lu(shares) in %lu (s) INTERVAL\n", my_group_num, delta_cpu_time, mytime, exp_cpu_time, myshares, delta_time); first_counter++; if (first_counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */ first_counter = 0; second_counter++; if (second_counter >= NUM_SETS) exit(0); /* This task is done with its job */ /* Change share values depending on the test_num */ if (test_num == 1) { /* Keep same ratio but change values */ myshares = MULTIPLIER * myshares; } else { /* Increase for odd task and decrease for even task */ if (my_group_num % 2) myshares += baseshares * GRANULARITY / 100; else myshares -= baseshares * GRANULARITY / 100; } write_to_file(mysharesfile, "w", myshares); if (test_num == 3) { /* * Read the shares file and again calculate the cpu fraction * No need to read tasks file as we do not migrate tasks * No need to scan all shares file as total shares are const */ if ((fmyshares = read_shares_file(mysharesfile)) < 2) tst_brkm(TBROK, cleanup, "in reading shares files %s ", mysharesfile); exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); } fprintf(stdout, "\ntask-%d SHARES=%lu\n", my_group_num, myshares); } /* end if */ } /* end while */ } /* end main */
/* * Function: scan_shares_file() * This function scans all the shares files under the mountpoint * of the controller and returns the total added shares of all * the groups (currently excludes default group) ?? */ int scan_shares_files(unsigned int *shares_pointer) { struct stat statbuffer; DIR *dp; char *path_pointer; /* * Check if we can get stat of the file */ if (lstat (fullpath, &statbuffer) < 0) error_function("Can not read stat for file ", fullpath); if (S_ISDIR (statbuffer.st_mode) == 0) /* not a directory */ { /* * We run all user tasks in the created groups and not default groups. So * exclude the shares of default group. FLAG to ensure dir_pointer is non NULL */ if ((FLAG == 1) && (strcmp(fullpath, "/dev/cpuctl/cpu.shares") != 0) &&\ (strcmp (dir_pointer->d_name, "cpu.shares") == 0)) { *shares_pointer += read_shares_file (fullpath); } return 0; } /* * Now it's a directory. let the path_pointer point to the end * of fullpath to append new files names */ path_pointer = fullpath + strlen(fullpath); *path_pointer++ = '/'; *path_pointer = 0; if ((dp = opendir(fullpath)) == NULL) /* Error in opening directory */ error_function("Can't open ", fullpath); /* * search all groups recursively and get total shares */ while ((dir_pointer = readdir(dp)) != NULL) /* Error in reading directory */ { if ((strcmp(dir_pointer->d_name, ".") == 0) || (strcmp(dir_pointer->d_name, "..") == 0)) continue; /* ignore current and parent directory */ FLAG = 1; strcpy (path_pointer, dir_pointer->d_name ); /* append name to fullpath */ if ((retval = scan_shares_files(shares_pointer)) != 0) break; } /* * This directory is searched fully. let us go back to parent directory again */ path_pointer[-1] = 0; if (closedir (dp) < 0) error_function("Could not close dir ", fullpath); return 0; }