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https://github.com/systemd/systemd-stable.git
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1aa1e24848
We never used any of the libsysfs convenience features. Here we replace it completely with 300 lines of code, which are much simpler and a bit faster cause udev(d) does not open any syfs file for a simple event which does not need any parent device information. Signed-off-by: Kay Sievers <kay.sievers@suse.de>
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/*
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* udevsend.c
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*
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* Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <string.h>
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#include <time.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <sys/un.h>
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#include <linux/stddef.h>
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#include "udev.h"
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#include "udevd.h"
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/* global variables */
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static int sock = -1;
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#ifdef USE_LOG
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void log_message (int priority, const char *format, ...)
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{
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va_list args;
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if (priority > udev_log_priority)
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return;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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}
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#endif
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int main(int argc, char *argv[], char *envp[])
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{
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static struct udevd_msg usend_msg;
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int usend_msg_len;
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int i;
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struct sockaddr_un saddr;
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socklen_t addrlen;
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int bufpos = 0;
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int retval = 0;
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const char *subsystem = NULL;
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logging_init("udevsend");
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#ifdef USE_LOG
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udev_config_init();
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#endif
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dbg("version %s", UDEV_VERSION);
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sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
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if (sock < 0) {
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err("error getting socket: %s", strerror(errno));
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retval = 1;
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goto exit;
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}
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memset(&saddr, 0x00, sizeof(struct sockaddr_un));
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saddr.sun_family = AF_LOCAL;
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/* use abstract namespace for socket path */
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strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
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addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
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memset(&usend_msg, 0x00, sizeof(struct udevd_msg));
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strcpy(usend_msg.magic, UDEV_MAGIC);
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usend_msg.type = UDEVD_UEVENT_UDEVSEND;
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/* copy all keys to send buffer */
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for (i = 0; envp[i]; i++) {
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const char *key;
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int keylen;
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key = envp[i];
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keylen = strlen(key);
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/* ignore events which are already sent on the netlink socket */
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if (strncmp(key, "SEQNUM=", 7) == 0) {
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dbg("ignoring event with SEQNUM set");
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retval = 0;
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goto exit;
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}
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/* prevent loops in the scripts we execute */
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if (strncmp(key, "UDEVD_EVENT=", 12) == 0) {
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err("event loop, already passed through the daemon, exit");
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retval = 2;
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goto exit;
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}
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if (bufpos + keylen >= UEVENT_BUFFER_SIZE-1) {
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err("environment buffer too small, probably not called by the kernel");
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continue;
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}
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/* remember the SUBSYSTEM */
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if (strncmp(key, "SUBSYSTEM=", 10) == 0)
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subsystem = &key[10];
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dbg("add '%s' to env[%i] buffer", key, i);
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strcpy(&usend_msg.envbuf[bufpos], key);
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bufpos += keylen + 1;
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}
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usend_msg_len = offsetof(struct udevd_msg, envbuf) + bufpos;
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dbg("usend_msg_len=%i", usend_msg_len);
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if (sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen) < 0) {
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retval = 3;
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err("error sending message: %s", strerror(errno));
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}
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exit:
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if (sock != -1)
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close(sock);
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logging_close();
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return retval;
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}
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