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;
  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         struct ustream_buf *buf = s->r.head;
  46         char *newline, *str;
  47         int len;
  48
  49         do {
  50                 str = ustream_get_read_buf(s, NULL);
  51                 if (!str)
  52                         break;
  53                 newline = strchr(buf->data, '\n');
  54                 if (!newline)
  55                         break;
  56                 *newline = 0;
  57                 len = newline + 1 - str;
  58                 SYSLOG(6, buf->data);
  59                 ustream_consume(s, len);
  60         } while (1);
  61 }
  62
  63 static void q_initd_run(struct runqueue *q, struct runqueue_task *t)
  64 {
  65         struct initd *s = container_of(t, struct initd, proc.task);
  66         int pipefd[2];
  67         pid_t pid;
  68
  69         DEBUG(1, "start %s %s \n", s->file, s->param);
  70         if (pipe(pipefd) == -1) {
  71                 ERROR("Failed to create pipe\n");
  72                 return;
  73         }
  74
  75         pid = fork();
  76         if (pid < 0)
  77                 return;
  78
  79         if (pid) {
  80                 close(pipefd[1]);
  81                 s->fd.stream.string_data = true,
  82                 s->fd.stream.notify_read = pipe_cb,
  83                 runqueue_process_add(q, &s->proc, pid);
  84                 ustream_fd_init(&s->fd, pipefd[0]);
  85                 return;
  86         }
  87         close(pipefd[0]);
  88         dup2(pipefd[1], STDOUT_FILENO);
  89         dup2(pipefd[1], STDERR_FILENO);
  90
  91         execlp(s->file, s->file, s->param, NULL);
  92         exit(1);
  93 }
  94
  95 static void q_initd_complete(struct runqueue *q, struct runqueue_process *p, int ret)
  96 {
  97         struct initd *s = container_of(p, struct initd, proc);
  98
  99         DEBUG(1, "stop %s %s \n", s->file, s->param);
 100         ustream_free(&s->fd.stream);
 101         close(s->fd.fd.fd);
 102         free(s);
 103 }
 104
 105 static void add_initd(char *file, char *param)
 106 {
 107         static const struct runqueue_task_type initd_type = {
 108                 .run = q_initd_run,
 109                 .cancel = runqueue_process_cancel_cb,
 110                 .kill = runqueue_process_kill_cb,
 111         };
 112         struct initd *s;
 113
 114         s = calloc(1, sizeof(*s));
 115         s->proc.task.type = &initd_type;
 116         s->proc.complete = q_initd_complete;
 117         s->param = param;
 118         s->file = file;
 119         runqueue_task_add(&q, &s->proc.task, false);
 120 }
 121
 122 int rcS(char *pattern, char *param, void (*q_empty)(struct runqueue *))
 123 {
 124         char dir[16];
 125         glob_t gl;
 126         int j;
 127
 128         runqueue_init(&q);
 129         q.empty_cb = q_empty;
 130         q.max_running_tasks = 1;
 131
 132         DEBUG(1, "running /etc/rc.d/%s %s\n", pattern, param);
 133         snprintf(dir, sizeof(dir), "/etc/rc.d/%s*", pattern);
 134         if (glob(dir, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl)) {
 135                 printf("glob failed on %s\n", dir);
 136                 return -1;
 137         }
 138
 139         for (j = 0; j < gl.gl_pathc; j++)
 140                 add_initd(gl.gl_pathv[j], param);
 141
 142         return 0;
 143 }