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         char *file;
  41         char *param;
  42 };
  43
  44 static void pipe_cb(struct ustream *s, int bytes)
  45 {
  46         struct initd *initd = container_of(s, struct initd, fd.stream);
  47         char *newline, *str;
  48         int len;
  49
  50         do {
  51                 str = ustream_get_read_buf(s, NULL);
  52                 if (!str)
  53                         break;
  54                 newline = strchr(str, '\n');
  55                 if (!newline)
  56                         break;
  57                 *newline = 0;
  58                 len = newline + 1 - str;
  59                 ULOG_NOTE("%s: %s", initd->file, str);
  60 #ifdef SHOW_BOOT_ON_CONSOLE
  61                 fprintf(stderr, "%s: %s\n", initd->file, str);
  62 #endif
  63                 ustream_consume(s, len);
  64         } while (1);
  65 }
  66
  67 static void q_initd_run(struct runqueue *q, struct runqueue_task *t)
  68 {
  69         struct initd *s = container_of(t, struct initd, proc.task);
  70         int pipefd[2];
  71         pid_t pid;
  72
  73         DEBUG(2, "start %s %s \n", s->file, s->param);
  74         if (pipe(pipefd) == -1) {
  75                 ERROR("Failed to create pipe\n");
  76                 return;
  77         }
  78
  79         pid = fork();
  80         if (pid < 0)
  81                 return;
  82
  83         if (pid) {
  84                 close(pipefd[1]);
  85                 s->fd.stream.string_data = true,
  86                 s->fd.stream.notify_read = pipe_cb,
  87                 runqueue_process_add(q, &s->proc, pid);
  88                 ustream_fd_init(&s->fd, pipefd[0]);
  89                 return;
  90         }
  91         close(pipefd[0]);
  92
  93         int devnull = open("/dev/null", O_RDONLY);
  94         dup2(devnull, STDIN_FILENO);
  95         dup2(pipefd[1], STDOUT_FILENO);
  96         dup2(pipefd[1], STDERR_FILENO);
  97
  98         if (devnull > STDERR_FILENO)
  99                 close(devnull);
 100
 101         execlp(s->file, s->file, s->param, NULL);
 102         exit(1);
 103 }
 104
 105 static void q_initd_complete(struct runqueue *q, struct runqueue_task *p)
 106 {
 107         struct initd *s = container_of(p, struct initd, proc.task);
 108
 109         DEBUG(2, "stop %s %s \n", s->file, s->param);
 110         ustream_free(&s->fd.stream);
 111         close(s->fd.fd.fd);
 112         free(s);
 113 }
 114
 115 static void add_initd(struct runqueue *q, char *file, char *param)
 116 {
 117         static const struct runqueue_task_type initd_type = {
 118                 .run = q_initd_run,
 119                 .cancel = runqueue_process_cancel_cb,
 120                 .kill = runqueue_process_kill_cb,
 121         };
 122         struct initd *s;
 123         char *p, *f;
 124
 125         s = calloc_a(sizeof(*s), &f, strlen(file) + 1, &p, strlen(param) + 1);
 126         if (!s) {
 127                 ERROR("Out of memory in %s.\n", file);
 128                 return;
 129         }
 130         s->proc.task.type = &initd_type;
 131         s->proc.task.complete = q_initd_complete;
 132         if (!strcmp(param, "stop") || !strcmp(param, "shutdown")) {
 133                 s->proc.task.run_timeout = 15000;
 134                 s->proc.task.cancel_timeout = 10000;
 135         }
 136         s->param = p;
 137         s->file = f;
 138         strcpy(s->param, param);
 139         strcpy(s->file, file);
 140         runqueue_task_add(q, &s->proc.task, false);
 141 }
 142
 143 static int _rc(struct runqueue *q, char *path, const char *file, char *pattern, char *param)
 144 {
 145         char *dir = alloca(2 + strlen(path) + strlen(file) + strlen(pattern));
 146         glob_t gl;
 147         int j;
 148
 149         if (!dir) {
 150                 ERROR("Out of memory in %s.\n", file);
 151                 return -1;
 152         }
 153
 154         DEBUG(2, "running %s/%s%s %s\n", path, file, pattern, param);
 155         sprintf(dir, "%s/%s%s", path, file, pattern);
 156         if (glob(dir, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl)) {
 157                 DEBUG(2, "glob failed on %s\n", dir);
 158                 return -1;
 159         }
 160
 161         for (j = 0; j < gl.gl_pathc; j++)
 162                 add_initd(q, gl.gl_pathv[j], param);
 163
 164         globfree(&gl);
 165
 166         return 0;
 167 }
 168
 169 int rcS(char *pattern, char *param, void (*q_empty)(struct runqueue *))
 170 {
 171         runqueue_init(&q);
 172         q.empty_cb = q_empty;
 173         q.max_running_tasks = 1;
 174
 175         return _rc(&q, "/etc/rc.d", pattern, "*", param);
 176 }
 177
 178 int rc(const char *file, char *param)
 179 {
 180         return _rc(&r, "/etc/init.d", file, "", param);
 181 }
 182
 183 static void r_empty(struct runqueue *q)
 184 {
 185
 186 }
 187
 188 static void __attribute__((constructor)) rc_init() {
 189         runqueue_init(&r);
 190         r.empty_cb = r_empty;
 191         r.max_running_tasks = 8;
 192 }