multi_process_server.c

/*
 * MIT License
 *
 * Copyright (c) 2019 Jianhui Zhao <zhaojh329@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <sys/sysinfo.h>
#include <sys/prctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>

#include "handler.h"

#define MAX_WORKER  10

static void signal_cb(struct ev_loop *loop, ev_signal *w, int revents)
{
    int i;

    if (w->signum == SIGINT) {
        pid_t *workers = w->data;

        for (i = 0; i < MAX_WORKER; i++) {
            if (workers[i] == 0)
                break;
            kill(workers[i], SIGKILL);
        }

        ev_break(loop, EVBREAK_ALL);
        log_info("Normal quit\n");
    }
}


static void usage(const char *prog)
{
    fprintf(stderr, "Usage: %s [option]\n"
            "          -h docroot     # Document root, default is .\n"
            "          -i index_page  # Index page, default is index.html\n"
            "          -a addr        # address to listen\n"
            "          -s addr        # address to listen with ssl\n"
            "          -P             # plugin path\n"
            "          -w             # worker process number, default is equal to available CPUs\n"
            "          -v             # verbose\n", prog);
    exit(1);
}

int main(int argc, char **argv)
{
    struct ev_loop *loop = EV_DEFAULT;
    struct ev_signal signal_watcher;
    struct uh_server *srv = NULL;
    pid_t workers[MAX_WORKER] = {};
    int nworker = get_nprocs();
    const char *docroot = ".";
    int verbose = 0;
    int opt, i;

    log_level(LOG_ERR);

    srv = uh_server_new(loop);
    if (!srv)
        return -1;

    while ((opt = getopt(argc, argv, "h:a:w:v")) != -1) {
        switch (opt) {
        case 'h':
            docroot = optarg;
            break;
        case 'a':
            if (srv->listen(srv, optarg, false) < 1)
                goto err;
            break;
        case 'w':
            nworker = atoi(optarg);
            break;
        case 'v':
            if (!verbose) {
                verbose++;
                log_level(LOG_INFO);
            } else {
                log_level(LOG_DEBUG);
            }
            break;
        default: /* '?' */
            usage(argv[0]);
        }
    }

    log_info("libuhttpd version: %s\n", UHTTPD_VERSION_STRING);

    if (nworker < 1)
        return 0;

    signal(SIGPIPE, SIG_IGN);

    srv->set_docroot(srv, docroot);

    srv->set_default_handler(srv, file_handler);
    srv->add_path_handler(srv, "^/echo$", echo_handler);

    for (i = 0; i < nworker - 1; i++) {
        pid_t pid = fork();
        if (pid < 0) {
            log_info("fork: %s\n", strerror(errno));
            break;
        }

        if (pid == 0) {
            prctl(PR_SET_PDEATHSIG, SIGKILL);
            ev_loop_fork(loop);
            ev_run(loop, 0);
            return 0;
        }

        workers[i] = pid;

        log_info("worker %d running...\n", pid);
    }

    ev_signal_init(&signal_watcher, signal_cb, SIGINT);
    signal_watcher.data = workers;
    ev_signal_start(loop, &signal_watcher);

    ev_run(loop, 0);

err:
    srv->free(srv);
    free(srv);

    ev_loop_destroy(loop);

    return 0;
}