top.c

Android 一些工具

/*
 * Copyright (c) 2008, The Android Open Source Project
 * 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.
 *  * Neither the name of Google, Inc. nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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
 * COPYRIGHT OWNER OR CONTRIBUTORS 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.
 */

#include <ctype.h>
#include <dirent.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>

struct cpu_info {
    long unsigned utime, ntime, stime, itime;
};

struct proc_info {
    struct proc_info *next;
    pid_t pid;
    pid_t tid;
    uid_t uid;
    gid_t gid;
    char name[256];
    char state;
    long unsigned utime;
    long unsigned stime;
    long unsigned delta_utime;
    long unsigned delta_stime;
    long unsigned delta_time;
    long vss;
    long rss;
    int num_threads;
};

struct proc_list {
    struct proc_info **array;
    int size;
};

#define die(...) { fprintf(stderr, __VA_ARGS__); exit(EXIT_FAILURE); }

#define INIT_PROCS 50
#define THREAD_MULT 4
static struct proc_info **old_procs, **new_procs;
static int num_old_procs, num_new_procs;
static struct proc_info *free_procs;
static int num_used_procs, num_free_procs;

static int max_procs, delay, iterations, threads;

static struct cpu_info old_cpu, new_cpu;

static struct proc_info *alloc_proc(void);
static void free_proc(struct proc_info *proc);
static void read_procs(void);
static int read_stat(char *filename, struct proc_info *proc);
static void add_proc(int proc_num, struct proc_info *proc);
static int read_cmdline(char *filename, struct proc_info *proc);
static int read_status(char *filename, struct proc_info *proc);
static void print_procs(void);
static struct proc_info *find_old_proc(pid_t pid, pid_t tid);
static void free_old_procs(void);
static int (*proc_cmp)(const void *a, const void *b);
static int proc_cpu_cmp(const void *a, const void *b);
static int proc_vss_cmp(const void *a, const void *b);
static int proc_rss_cmp(const void *a, const void *b);
static int proc_thr_cmp(const void *a, const void *b);
static int numcmp(long long a, long long b);
static void usage(char *cmd);

int top_main(int argc, char *argv[]) {
    int i;

    num_used_procs = num_free_procs = 0;

    max_procs = 0;
    delay = 3;
    iterations = -1;
    proc_cmp = &proc_cpu_cmp;
    for (i = 1; i < argc; i++) {
        if (!strcmp(argv[i], "-m")) {
            if (i + 1 >= argc) {
                fprintf(stderr, "Option -m expects an argument.\n");
                usage(argv[0]);
                exit(EXIT_FAILURE);
            }
            max_procs = atoi(argv[++i]);
            continue;
        }
        if (!strcmp(argv[i], "-n")) {
            if (i + 1 >= argc) {
                fprintf(stderr, "Option -n expects an argument.\n");
                usage(argv[0]);
                exit(EXIT_FAILURE);
            }
            iterations = atoi(argv[++i]);
            continue;
        }
        if (!strcmp(argv[i], "-d")) {
            if (i + 1 >= argc) {
                fprintf(stderr, "Option -d expects an argument.\n");
                usage(argv[0]);
                exit(EXIT_FAILURE);
            }
            delay = atoi(argv[++i]);
            continue;
        }
        if (!strcmp(argv[i], "-s")) {
            if (i + 1 >= argc) {
                fprintf(stderr, "Option -s expects an argument.\n");
                usage(argv[0]);
                exit(EXIT_FAILURE);
            }
            ++i;
            if (!strcmp(argv[i], "cpu")) { proc_cmp = &proc_cpu_cmp; continue; }
            if (!strcmp(argv[i], "vss")) { proc_cmp = &proc_vss_cmp; continue; }
            if (!strcmp(argv[i], "rss")) { proc_cmp = &proc_rss_cmp; continue; }
            if (!strcmp(argv[i], "thr")) { proc_cmp = &proc_thr_cmp; continue; }
            fprintf(stderr, "Invalid argument \"%s\" for option -s.\n", argv[i]);
            exit(EXIT_FAILURE);
        }
        if (!strcmp(argv[i], "-t")) { threads = 1; continue; }
        if (!strcmp(argv[i], "-h")) {
            usage(argv[0]);
            exit(EXIT_SUCCESS);
        }
        fprintf(stderr, "Invalid argument \"%s\".\n", argv[i]);
        usage(argv[0]);
        exit(EXIT_FAILURE);
    }

    if (threads && proc_cmp == &proc_thr_cmp) {
        fprintf(stderr, "Sorting by threads per thread makes no sense!\n");
        exit(EXIT_FAILURE);
    }

    free_procs = NULL;

    num_new_procs = num_old_procs = 0;
    new_procs = old_procs = NULL;

    read_procs();
    while ((iterations == -1) || (iterations-- > 0)) {
        old_procs = new_procs;
        num_old_procs = num_new_procs;
        memcpy(&old_cpu, &new_cpu, sizeof(old_cpu));
        sleep(delay);
        read_procs();
        print_procs();
        free_old_procs();
    }

    return 0;
}

static struct proc_info *alloc_proc(void) {
    struct proc_info *proc;

    if (free_procs) {
        proc = free_procs;
        free_procs = free_procs->next;
        num_free_procs--;
    } else {
        proc = malloc(sizeof(*proc));
        if (!proc) die("Could not allocate struct process_info.\n");
    }

    num_used_procs++;

    return proc;
}

static void free_proc(struct proc_info *proc) {
    proc->next = free_procs;
    free_procs = proc;

    num_used_procs--;
    num_free_procs++;
}

#define MAX_LINE 256

static void read_procs(void) {
    DIR *proc_dir, *task_dir;
    struct dirent *pid_dir, *tid_dir;
    char filename[64];
    FILE *file;
    int proc_num;
    struct proc_info *proc;
    pid_t pid, tid;

    int i;

    proc_dir = opendir("/proc");
    if (!proc_dir) die("Could not open /proc.\n");

    new_procs = calloc(INIT_PROCS * (threads ? THREAD_MULT : 1), sizeof(struct proc_info *));
    num_new_procs = INIT_PROCS * (threads ? THREAD_MULT : 1);

    file = fopen("/proc/stat", "r");
    if (!file) die("Could not open /proc/stat.\n");
    fscanf(file, "cpu  %lu %lu %lu %lu", &new_cpu.utime, &new_cpu.ntime, &new_cpu.stime, &new_cpu.itime);
    fclose(file);

    proc_num = 0;
    while ((pid_dir = readdir(proc_dir))) {
        if (!isdigit(pid_dir->d_name[0]))
            continue;

        pid = atoi(pid_dir->d_name);

        if (!threads) {
            proc = alloc_proc();

            proc->pid = proc->tid = pid;

            sprintf(filename, "/proc/%d/stat", pid);
            read_stat(filename, proc);

            sprintf(filename, "/proc/%d/cmdline", pid);
            read_cmdline(filename, proc);

            sprintf(filename, "/proc/%d/status", pid);
            read_status(filename, proc);

            proc->num_threads = 0;
        } else {
            proc = NULL;
        }