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                 ustream_consume(s, len);
  59         } while (1);
  60 }
  61
  62 static void q_initd_run(struct runqueue *q, struct runqueue_task *t)
  63 {
  64         struct initd *s = container_of(t, struct initd, proc.task);
  65         int pipefd[2];
  66         pid_t pid;
  67
  68         DEBUG(2, "start %s %s \n", s->file, s->param);
  69         if (pipe(pipefd) == -1) {
  70                 ERROR("Failed to create pipe\n");
  71                 return;
  72         }
  73
  74         pid = fork();
  75         if (pid < 0)
  76                 return;
  77
  78         if (pid) {
  79                 close(pipefd[1]);
  80                 s->fd.stream.string_data = true,
  81                 s->fd.stream.notify_read = pipe_cb,
  82                 runqueue_process_add(q, &s->proc, pid);
  83                 ustream_fd_init(&s->fd, pipefd[0]);
  84                 return;
  85         }
  86         close(pipefd[0]);
  87         dup2(pipefd[1], STDOUT_FILENO);
  88         dup2(pipefd[1], STDERR_FILENO);
  89
  90         execlp(s->file, s->file, s->param, NULL);
  91         exit(1);
  92 }
  93
  94 static void q_initd_complete(struct runqueue *q, struct runqueue_task *p)
  95 {
  96         struct initd *s = container_of(p, struct initd, proc.task);
  97
  98         DEBUG(2, "stop %s %s \n", s->file, s->param);
  99         ustream_free(&s->fd.stream);
 100         close(s->fd.fd.fd);
 101         free(s);
 102 }
 103
 104 static void add_initd(struct runqueue *q, char *file, char *param)
 105 {
 106         static const struct runqueue_task_type initd_type = {
 107                 .run = q_initd_run,
 108                 .cancel = runqueue_process_cancel_cb,
 109                 .kill = runqueue_process_kill_cb,
 110         };
 111         struct initd *s;
 112         char *p, *f;
 113
 114         s = calloc_a(sizeof(*s), &f, strlen(file) + 1, &p, strlen(param) + 1);
 115         s->proc.task.type = &initd_type;
 116         s->proc.task.complete = q_initd_complete;
 117         if (!strcmp(param, "stop"))
 118                 s->proc.task.run_timeout = 15000;
 119         s->param = p;
 120         s->file = f;
 121         strcpy(s->param, param);
 122         strcpy(s->file, file);
 123         runqueue_task_add(q, &s->proc.task, false);
 124 }
 125
 126 static int _rc(struct runqueue *q, char *path, const char *file, char *pattern, char *param)
 127 {
 128         char *dir = alloca(2 + strlen(path) + strlen(file) + strlen(pattern));
 129         glob_t gl;
 130         int j;
 131
 132         DEBUG(2, "running %s/%s%s %s\n", path, file, pattern, param);
 133         sprintf(dir, "%s/%s%s", path, file, pattern);
 134         if (glob(dir, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl)) {
 135                 DEBUG(2, "glob failed on %s\n", dir);
 136                 return -1;
 137         }
 138
 139         for (j = 0; j < gl.gl_pathc; j++)
 140                 add_initd(q, gl.gl_pathv[j], param);
 141
 142         globfree(&gl);
 143
 144         return 0;
 145 }
 146
 147 int rcS(char *pattern, char *param, void (*q_empty)(struct runqueue *))
 148 {
 149         runqueue_init(&q);
 150         q.empty_cb = q_empty;
 151         q.max_running_tasks = 1;
 152
 153         return _rc(&q, "/etc/rc.d", pattern, "*", param);
 154 }
 155
 156 int rc(const char *file, char *param)
 157 {
 158         return _rc(&r, "/etc/init.d", file, "", param);
 159 }
 160
 161 static void r_empty(struct runqueue *q)
 162 {
 163
 164 }
 165
 166 static void __attribute__((constructor)) rc_init() {
 167         runqueue_init(&r);
 168         r.empty_cb = r_empty;
 169         r.max_running_tasks = 8;
 170 }