rcS.c

   1 /*
   2  * runqueue-example.c
   3  *
   4  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <libubox/uloop.h>
  20 #include <libubox/runqueue.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <unistd.h>
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <glob.h>
  29
  30 #include <libubox/ustream.h>
  31
  32 #include "procd.h"
  33 #include "rcS.h"
  34
  35 static struct runqueue q, r;
  36
  37 struct initd {
  38         struct ustream_fd fd;
  39         struct runqueue_process proc;
  40         struct timespec ts_start;
  41         char *file;
  42         char *param;
  43 };
  44
  45 static void pipe_cb(struct ustream *s, int bytes)
  46 {
  47         struct initd *initd = container_of(s, struct initd, fd.stream);
  48         char *newline, *str;
  49         int len;
  50
  51         do {
  52                 str = ustream_get_read_buf(s, NULL);
  53                 if (!str)
  54                         break;
  55                 newline = strchr(str, '\n');
  56                 if (!newline)
  57                         break;
  58                 *newline = 0;
  59                 len = newline + 1 - str;
  60                 ULOG_NOTE("%s: %s", initd->file, str);
  61 #ifdef SHOW_BOOT_ON_CONSOLE
  62                 fprintf(stderr, "%s: %s\n", initd->file, str);
  63 #endif
  64                 ustream_consume(s, len);
  65         } while (1);
  66 }
  67
  68 static void q_initd_run(struct runqueue *q, struct runqueue_task *t)
  69 {
  70         struct initd *s = container_of(t, struct initd, proc.task);
  71         int pipefd[2];
  72         pid_t pid;
  73
  74         clock_gettime(CLOCK_MONOTONIC_RAW, &s->ts_start);
  75         DEBUG(2, "start %s %s \n", s->file, s->param);
  76         if (pipe(pipefd) == -1) {
  77                 ERROR("Failed to create pipe: %m\n");
  78                 return;
  79         }
  80
  81         pid = fork();
  82         if (pid < 0)
  83                 return;
  84
  85         if (pid) {
  86                 close(pipefd[1]);
  87                 fcntl(pipefd[0], F_SETFD, FD_CLOEXEC);
  88                 s->fd.stream.string_data = true,
  89                 s->fd.stream.notify_read = pipe_cb,
  90                 runqueue_process_add(q, &s->proc, pid);
  91                 ustream_fd_init(&s->fd, pipefd[0]);
  92                 return;
  93         }
  94         close(pipefd[0]);
  95
  96         int devnull = open("/dev/null", O_RDONLY);
  97         dup2(devnull, STDIN_FILENO);
  98         dup2(pipefd[1], STDOUT_FILENO);
  99         dup2(pipefd[1], STDERR_FILENO);
 100
 101         if (devnull > STDERR_FILENO)
 102                 close(devnull);
 103
 104         execlp(s->file, s->file, s->param, NULL);
 105         exit(1);
 106 }
 107
 108 static void q_initd_complete(struct runqueue *q, struct runqueue_task *p)
 109 {
 110         struct initd *s = container_of(p, struct initd, proc.task);
 111         struct timespec ts_stop, ts_res;
 112
 113         clock_gettime(CLOCK_MONOTONIC_RAW, &ts_stop);
 114         ts_res.tv_sec = ts_stop.tv_sec - s->ts_start.tv_sec;
 115         ts_res.tv_nsec = ts_stop.tv_nsec - s->ts_start.tv_nsec;
 116         if (ts_res.tv_nsec < 0) {
 117                 --ts_res.tv_sec;
 118                 ts_res.tv_nsec += 1000000000;
 119         }
 120
 121         DEBUG(2, "stop %s %s - took %lu.%09lus\n", s->file, s->param, ts_res.tv_sec, ts_res.tv_nsec);
 122         ustream_free(&s->fd.stream);
 123         close(s->fd.fd.fd);
 124         free(s);
 125 }
 126
 127 static void add_initd(struct runqueue *q, char *file, char *param)
 128 {
 129         static const struct runqueue_task_type initd_type = {
 130                 .run = q_initd_run,
 131                 .cancel = runqueue_process_cancel_cb,
 132                 .kill = runqueue_process_kill_cb,
 133         };
 134         struct initd *s;
 135         char *p, *f;
 136
 137         s = calloc_a(sizeof(*s), &f, strlen(file) + 1, &p, strlen(param) + 1);
 138         if (!s) {
 139                 ERROR("Out of memory in %s.\n", file);
 140                 return;
 141         }
 142         s->proc.task.type = &initd_type;
 143         s->proc.task.complete = q_initd_complete;
 144         if (!strcmp(param, "stop") || !strcmp(param, "shutdown")) {
 145                 s->proc.task.run_timeout = 15000;
 146                 s->proc.task.cancel_timeout = 10000;
 147         }
 148         s->param = p;
 149         s->file = f;
 150         strcpy(s->param, param);
 151         strcpy(s->file, file);
 152         runqueue_task_add(q, &s->proc.task, false);
 153 }
 154
 155 static int _rc(struct runqueue *q, char *path, const char *file, char *pattern, char *param)
 156 {
 157         char *dir = alloca(2 + strlen(path) + strlen(file) + strlen(pattern));
 158         glob_t gl;
 159         int j;
 160
 161         if (!dir) {
 162                 ERROR("Out of memory in %s.\n", file);
 163                 return -1;
 164         }
 165
 166         DEBUG(2, "running %s/%s%s %s\n", path, file, pattern, param);
 167         sprintf(dir, "%s/%s%s", path, file, pattern);
 168         if (glob(dir, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl)) {
 169                 DEBUG(2, "glob failed on %s\n", dir);
 170                 return -1;
 171         }
 172
 173         for (j = 0; j < gl.gl_pathc; j++)
 174                 add_initd(q, gl.gl_pathv[j], param);
 175
 176         globfree(&gl);
 177
 178         return 0;
 179 }
 180
 181 int rcS(char *pattern, char *param, void (*q_empty)(struct runqueue *))
 182 {
 183         runqueue_init(&q);
 184         q.empty_cb = q_empty;
 185         q.max_running_tasks = 1;
 186
 187         return _rc(&q, "/etc/rc.d", pattern, "*", param);
 188 }
 189
 190 int rc(const char *file, char *param)
 191 {
 192         return _rc(&r, "/etc/init.d", file, "", param);
 193 }
 194
 195 static void r_empty(struct runqueue *q)
 196 {
 197
 198 }
 199
 200 static void __attribute__((constructor)) rc_init() {
 201         runqueue_init(&r);
 202         r.empty_cb = r_empty;
 203         r.max_running_tasks = 8;
 204 }