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         int sock;
  36         struct sockaddr_un saddr;
  37         socklen_t addrlen;
  38 };
  39
  40 struct udev_ctrl *udev_ctrl_new_from_socket(const char *socket_path)
  41 {
  42         struct udev_ctrl *uctrl;
  43
  44         uctrl = malloc(sizeof(struct udev_ctrl));
  45         if (uctrl == NULL)
  46                 return NULL;
  47         memset(uctrl, 0x00, sizeof(struct udev_ctrl));
  48
  49         uctrl->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
  50         if (uctrl->sock < 0) {
  51                 err("error getting socket: %s\n", strerror(errno));
  52                 free(uctrl);
  53                 return NULL;
  54         }
  55
  56         uctrl->saddr.sun_family = AF_LOCAL;
  57         strcpy(uctrl->saddr.sun_path, socket_path);
  58         uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path);
  59         /* translate leading '@' to abstract namespace */
  60         if (uctrl->saddr.sun_path[0] == '@')
  61                 uctrl->saddr.sun_path[0] = '\0';
  62         return uctrl;
  63 }
  64
  65 void udev_ctrl_unref(struct udev_ctrl *uctrl)
  66 {
  67         if (uctrl == NULL)
  68                 return;
  69         close(uctrl->sock);
  70 }
  71
  72 static int ctrl_send(struct udev_ctrl *uctrl, enum udevd_ctrl_msg_type type, int intval, const char *buf)
  73 {
  74         struct udevd_ctrl_msg ctrl_msg;
  75         int err;
  76
  77         memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
  78         strcpy(ctrl_msg.magic, UDEVD_CTRL_MAGIC);
  79         ctrl_msg.type = type;
  80
  81         if (buf != NULL)
  82                 strlcpy(ctrl_msg.buf, buf, sizeof(ctrl_msg.buf));
  83         else
  84                 ctrl_msg.intval = intval;
  85
  86         err = sendto(uctrl->sock, &ctrl_msg, sizeof(ctrl_msg), 0, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
  87         if (err == -1) {
  88                 err("error sending message: %s\n", strerror(errno));
  89         }
  90         return err;
  91 }
  92
  93 int udev_ctrl_set_log_level(struct udev_ctrl *uctrl, int priority)
  94 {
  95         ctrl_send(uctrl, UDEVD_CTRL_SET_LOG_LEVEL, priority, NULL);
  96         return 0;
  97 }
  98
  99 int udev_ctrl_stop_exec_queue(struct udev_ctrl *uctrl)
 100 {
 101         ctrl_send(uctrl, UDEVD_CTRL_STOP_EXEC_QUEUE, 0, NULL);
 102         return 0;
 103 }
 104
 105 int udev_ctrl_start_exec_queue(struct udev_ctrl *uctrl)
 106 {
 107         ctrl_send(uctrl, UDEVD_CTRL_START_EXEC_QUEUE, 0, NULL);
 108         return 0;
 109 }
 110
 111 int udev_ctrl_reload_rules(struct udev_ctrl *uctrl)
 112 {
 113         ctrl_send(uctrl, UDEVD_CTRL_RELOAD_RULES, 0, NULL);
 114         return 0;
 115 }
 116
 117 int udev_ctrl_set_env(struct udev_ctrl *uctrl, const char *key)
 118 {
 119         ctrl_send(uctrl, UDEVD_CTRL_ENV, 0, optarg);
 120         return 0;
 121 }
 122
 123 int udev_ctrl_set_max_childs(struct udev_ctrl *uctrl, int count)
 124 {
 125         ctrl_send(uctrl, UDEVD_CTRL_SET_MAX_CHILDS, count, NULL);
 126         return 0;
 127 }
 128
 129 int udev_ctrl_set_max_childs_running(struct udev_ctrl *uctrl, int count)
 130 {
 131         ctrl_send(uctrl, UDEVD_CTRL_SET_MAX_CHILDS_RUNNING, count, NULL);
 132         return 0;
 133 }