source: mainline/uspace/app/ps/ps.c@ a2a00e8

/*
 * Copyright (c) 2010 Stanislav Kozina
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup ps
 * @brief Task lister.
 * @{
 */
/**
 * @file
 */

#include <stdio.h>
#include <task.h>
#include <thread.h>
#include <ps.h>
#include <errno.h>
#include <stdlib.h>
/* #include <string.h> */
#include <malloc.h>

#define TASK_COUNT 10
#define THREAD_COUNT 50

/** Thread states */
static const char *thread_states[] = {
        "Invalid",
        "Running",
        "Sleeping",
        "Ready",
        "Entering",
        "Exiting",
        "Lingering"
}; 

static void list_tasks(void)
{
        int task_count = TASK_COUNT;
        task_id_t *tasks = malloc(task_count * sizeof(task_id_t));
        int result = get_task_ids(tasks, sizeof(task_id_t) * task_count);

        while (result > task_count) {
                task_count *= 2;
                tasks = realloc(tasks, task_count * sizeof(task_id_t));
                result = get_task_ids(tasks, sizeof(task_id_t) * task_count);
        }

        printf("      ID  Threads    Pages    [k]Cycles Name\n");

        int i;
        for (i = 0; i < result; ++i) {
                task_info_t taskinfo;
                get_task_info(tasks[i], &taskinfo);
                printf("%8llu %8u %8u %12llu %s\n", tasks[i], taskinfo.thread_count, 
                                taskinfo.pages, taskinfo.cycles / 1000, taskinfo.name);
        }
}

static void list_threads(task_id_t taskid)
{
        int thread_count = THREAD_COUNT;
        thread_info_t *threads = malloc(thread_count * sizeof(thread_info_t));
        int result = get_task_threads(taskid, threads, sizeof(thread_info_t) * thread_count);

        while (result > thread_count) {
                thread_count *= 2;
                threads = realloc(threads, thread_count * sizeof(thread_info_t));
                result = get_task_threads(taskid, threads, sizeof(thread_info_t) * thread_count);
        }

        if (result == 0) {
                printf("No task with given pid!\n");
                exit(1);
        }

        int i;
        printf("    ID    State  CPU   Prio    [k]Cycles\n");
        for (i = 0; i < result; ++i) {
                printf("%6llu %-8s %4u %6d %12llu\n", threads[i].tid, thread_states[threads[i].state],
                                threads[i].cpu, threads[i].priority, threads[i].cycles / 1000);
        }
}

static void usage()
{
        printf("Usage: ps [-t pid]\n");
}

int main(int argc, char *argv[])
{
        --argc; ++argv;

        if (argc > 0)
        {
                if (str_cmp(*argv, "-t") == 0) {
                        --argc; ++argv;
                        if (argc != 1) {
                                printf("Bad argument count!\n");
                                usage();
                                exit(1);
                        }
                        task_id_t taskid = strtol(*argv, NULL, 10);
                        list_threads(taskid);
                } else {
                        printf("Unknown argument %s!\n", *argv);
                        usage();
                        exit(1);
                }

        } else {
                list_tasks();
        }

        return 0;
}

/** @}
 */