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