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 <glob.h>
  28
  29 #include <libubox/ustream.h>
  30
  31 #include "procd.h"
  32 #include "rcS.h"
  33
  34 static struct runqueue q, r;
  35
  36 struct initd {
  37         struct ustream_fd fd;
  38         struct runqueue_process proc;
  39         char *file;
  40         char *param;
  41 };
  42
  43 static void pipe_cb(struct ustream *s, int bytes)
  44 {
  45         char *newline, *str;
  46         int len;
  47
  48         do {
  49                 str = ustream_get_read_buf(s, NULL);
  50                 if (!str)
  51                         break;
  52                 newline = strchr(str, '\n');
  53                 if (!newline)
  54                         break;
  55                 *newline = 0;
  56                 len = newline + 1 - str;
  57                 syslog(0, "%s", str);
  58 #ifdef SHOW_BOOT_ON_CONSOLE
  59                 fprintf(stderr, "%s\n", str);
  60 #endif
  61                 ustream_consume(s, len);
  62         } while (1);
  63 }
  64
  65 static void q_initd_run(struct runqueue *q, struct runqueue_task *t)
  66 {
  67         struct initd *s = container_of(t, struct initd, proc.task);
  68         int pipefd[2];
  69         pid_t pid;
  70
  71         DEBUG(2, "start %s %s \n", s->file, s->param);
  72         if (pipe(pipefd) == -1) {
  73                 ERROR("Failed to create pipe\n");
  74                 return;
  75         }
  76
  77         pid = fork();
  78         if (pid < 0)
  79                 return;
  80
  81         if (pid) {
  82                 close(pipefd[1]);
  83                 s->fd.stream.string_data = true,
  84                 s->fd.stream.notify_read = pipe_cb,
  85                 runqueue_process_add(q, &s->proc, pid);
  86                 ustream_fd_init(&s->fd, pipefd[0]);
  87                 return;
  88         }
  89         close(pipefd[0]);
  90         dup2(pipefd[1], STDOUT_FILENO);
  91         dup2(pipefd[1], STDERR_FILENO);
  92
  93         execlp(s->file, s->file, s->param, NULL);
  94         exit(1);
  95 }
  96
  97 static void q_initd_complete(struct runqueue *q, struct runqueue_task *p)
  98 {
  99         struct initd *s = container_of(p, struct initd, proc.task);
 100
 101         DEBUG(2, "stop %s %s \n", s->file, s->param);
 102         ustream_free(&s->fd.stream);
 103         close(s->fd.fd.fd);
 104         free(s);
 105 }
 106
 107 static void add_initd(struct runqueue *q, char *file, char *param)
 108 {
 109         static const struct runqueue_task_type initd_type = {
 110                 .run = q_initd_run,
 111                 .cancel = runqueue_process_cancel_cb,
 112                 .kill = runqueue_process_kill_cb,
 113         };
 114         struct initd *s;
 115         char *p, *f;
 116
 117         s = calloc_a(sizeof(*s), &f, strlen(file) + 1, &p, strlen(param) + 1);
 118         s->proc.task.type = &initd_type;
 119         s->proc.task.complete = q_initd_complete;
 120         if (!strcmp(param, "stop") || !strcmp(param, "shutdown"))
 121                 s->proc.task.run_timeout = 15000;
 122         s->param = p;
 123         s->file = f;
 124         strcpy(s->param, param);
 125         strcpy(s->file, file);
 126         runqueue_task_add(q, &s->proc.task, false);
 127 }
 128
 129 static int _rc(struct runqueue *q, char *path, const char *file, char *pattern, char *param)
 130 {
 131         char *dir = alloca(2 + strlen(path) + strlen(file) + strlen(pattern));
 132         glob_t gl;
 133         int j;
 134
 135         DEBUG(2, "running %s/%s%s %s\n", path, file, pattern, param);
 136         sprintf(dir, "%s/%s%s", path, file, pattern);
 137         if (glob(dir, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl)) {
 138                 DEBUG(2, "glob failed on %s\n", dir);
 139                 return -1;
 140         }
 141
 142         for (j = 0; j < gl.gl_pathc; j++)
 143                 add_initd(q, gl.gl_pathv[j], param);
 144
 145         globfree(&gl);
 146
 147         return 0;
 148 }
 149
 150 int rcS(char *pattern, char *param, void (*q_empty)(struct runqueue *))
 151 {
 152         runqueue_init(&q);
 153         q.empty_cb = q_empty;
 154         q.max_running_tasks = 1;
 155
 156         return _rc(&q, "/etc/rc.d", pattern, "*", param);
 157 }
 158
 159 int rc(const char *file, char *param)
 160 {
 161         return _rc(&r, "/etc/init.d", file, "", param);
 162 }
 163
 164 static void r_empty(struct runqueue *q)
 165 {
 166
 167 }
 168
 169 static void __attribute__((constructor)) rc_init() {
 170         runqueue_init(&r);
 171         r.empty_cb = r_empty;
 172         r.max_running_tasks = 8;
 173 }