udev/udev-control.c

   1 /*
   2  * Copyright (C) 2005-2008 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  *      This program is free software; you can redistribute it and/or modify it
   5  *      under the terms of the GNU General Public License as published by the
   6  *      Free Software Foundation version 2 of the License.
   7  *
   8  *      This program is distributed in the hope that it will be useful, but
   9  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  *      General Public License for more details.
  12  *
  13  *      You should have received a copy of the GNU General Public License along
  14  *      with this program; if not, write to the Free Software Foundation, Inc.,
  15  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16  *
  17  */
  18
  19 #include "config.h"
  20
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stddef.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <sys/types.h>
  28 #include <sys/socket.h>
  29 #include <sys/un.h>
  30
  31 #include "udev.h"
  32 #include "udevd.h"
  33
  34 struct udev_ctrl {
  35         struct udev *udev;
  36         int sock;
  37         struct sockaddr_un saddr;
  38         socklen_t addrlen;
  39 };
  40
  41 struct udev_ctrl *udev_ctrl_new_from_socket(struct udev *udev, const char *socket_path)
  42 {
  43         struct udev_ctrl *uctrl;
  44
  45         uctrl = malloc(sizeof(struct udev_ctrl));
  46         if (uctrl == NULL)
  47                 return NULL;
  48         memset(uctrl, 0x00, sizeof(struct udev_ctrl));
  49         uctrl->udev = udev;
  50
  51         uctrl->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
  52         if (uctrl->sock < 0) {
  53                 err(udev, "error getting socket: %s\n", strerror(errno));
  54                 free(uctrl);
  55                 return NULL;
  56         }
  57
  58         uctrl->saddr.sun_family = AF_LOCAL;
  59         strcpy(uctrl->saddr.sun_path, socket_path);
  60         uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path);
  61         /* translate leading '@' to abstract namespace */
  62         if (uctrl->saddr.sun_path[0] == '@')
  63                 uctrl->saddr.sun_path[0] = '\0';
  64         return uctrl;
  65 }
  66
  67 void udev_ctrl_unref(struct udev_ctrl *uctrl)
  68 {
  69         if (uctrl == NULL)
  70                 return;
  71         close(uctrl->sock);
  72 }
  73
  74 static int ctrl_send(struct udev_ctrl *uctrl, enum udevd_ctrl_msg_type type, int intval, const char *buf)
  75 {
  76         struct udevd_ctrl_msg ctrl_msg;
  77         int err;
  78
  79         memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
  80         strcpy(ctrl_msg.magic, UDEVD_CTRL_MAGIC);
  81         ctrl_msg.type = type;
  82
  83         if (buf != NULL)
  84                 strlcpy(ctrl_msg.buf, buf, sizeof(ctrl_msg.buf));
  85         else
  86                 ctrl_msg.intval = intval;
  87
  88         err = sendto(uctrl->sock, &ctrl_msg, sizeof(ctrl_msg), 0, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
  89         if (err == -1) {
  90                 err(uctrl->udev, "error sending message: %s\n", strerror(errno));
  91         }
  92         return err;
  93 }
  94
  95 int udev_ctrl_set_log_level(struct udev_ctrl *uctrl, int priority)
  96 {
  97         ctrl_send(uctrl, UDEVD_CTRL_SET_LOG_LEVEL, priority, NULL);
  98         return 0;
  99 }
 100
 101 int udev_ctrl_stop_exec_queue(struct udev_ctrl *uctrl)
 102 {
 103         ctrl_send(uctrl, UDEVD_CTRL_STOP_EXEC_QUEUE, 0, NULL);
 104         return 0;
 105 }
 106
 107 int udev_ctrl_start_exec_queue(struct udev_ctrl *uctrl)
 108 {
 109         ctrl_send(uctrl, UDEVD_CTRL_START_EXEC_QUEUE, 0, NULL);
 110         return 0;
 111 }
 112
 113 int udev_ctrl_reload_rules(struct udev_ctrl *uctrl)
 114 {
 115         ctrl_send(uctrl, UDEVD_CTRL_RELOAD_RULES, 0, NULL);
 116         return 0;
 117 }
 118
 119 int udev_ctrl_set_env(struct udev_ctrl *uctrl, const char *key)
 120 {
 121         ctrl_send(uctrl, UDEVD_CTRL_ENV, 0, optarg);
 122         return 0;
 123 }
 124
 125 int udev_ctrl_set_max_childs(struct udev_ctrl *uctrl, int count)
 126 {
 127         ctrl_send(uctrl, UDEVD_CTRL_SET_MAX_CHILDS, count, NULL);
 128         return 0;
 129 }
 130
 131 int udev_ctrl_set_max_childs_running(struct udev_ctrl *uctrl, int count)
 132 {
 133         ctrl_send(uctrl, UDEVD_CTRL_SET_MAX_CHILDS_RUNNING, count, NULL);
 134         return 0;
 135 }