arbitrary commands when devices come and go in the device tree (which is different than the /dev directory). This is an initial version. Much of the planned power isn't here. Instead of doing the full matching, we always run /etc/devd-generic. /etc/devd.generic will go away at some point, I think. I'm committing it in this early state so I can start getting feedback from early adapters. Approved by: re
224 lines
4.7 KiB
C
224 lines
4.7 KiB
C
/*-
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* Copyright (c) 2002 M. Warner Losh.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* DEVD control daemon.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "devd.h"
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#define CF "/etc/devd.conf"
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extern FILE *yyin;
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extern int lineno;
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int dflag;
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int romeo_must_die = 0;
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struct file_list_head dirlist = TAILQ_HEAD_INITIALIZER(dirlist);
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static void event_loop(void);
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static void parse(void);
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static void parse_config_file(const char *fn);
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static void parse_files_in_dir(const char *dirname);
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static void reset_config(void);
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static void usage(void);
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void
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add_directory(const char *dir)
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{
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struct file_list *elm;
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elm = malloc(sizeof(*elm));
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elm->path = strdup(dir);
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TAILQ_INSERT_TAIL(&dirlist, elm, fl_link);
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}
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static void
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reset_config(void)
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{
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struct file_list *flp;
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TAILQ_FOREACH(flp, &dirlist, fl_link) {
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free(flp->path);
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free(flp);
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}
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}
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static void
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parse_config_file(const char *fn)
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{
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if (dflag)
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printf("Parsing %s\n", fn);
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yyin = fopen(fn, "r");
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if (yyin == NULL)
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err(1, "Cannot open config file %s", fn);
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if (yyparse() != 0)
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errx(1, "Cannot parse %s at line %d", fn, lineno);
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fclose(yyin);
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}
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static void
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parse_files_in_dir(const char *dirname)
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{
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DIR *dirp;
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struct dirent *dp;
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char path[PATH_MAX];
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if (dflag)
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printf("Parsing files in %s\n", dirname);
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dirp = opendir(dirname);
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if (dirp == NULL)
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return;
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readdir(dirp); /* Skip . */
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readdir(dirp); /* Skip .. */
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while ((dp = readdir(dirp)) != NULL) {
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if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
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snprintf(path, sizeof(path), "%s/%s",
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dirname, dp->d_name);
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parse_config_file(path);
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}
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}
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}
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static void
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parse(void)
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{
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struct file_list *flp;
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parse_config_file(CF);
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TAILQ_FOREACH(flp, &dirlist, fl_link) {
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parse_files_in_dir(flp->path);
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}
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}
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static void
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process_event(const char *buffer)
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{
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char type;
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char cmd[1024];
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char *sp;
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// Ignore unknown devices for now.
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if (*buffer == '?')
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return;
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type = *buffer++;
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sp = strchr(buffer, ' ');
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if (sp == NULL)
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return; /* Can't happen? */
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*sp = '\0';
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snprintf(cmd, sizeof(cmd), "/etc/devd-generic %s %s", buffer,
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type == '+' ? "start" : "stop");
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if (dflag)
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printf("Trying '%s'\n", cmd);
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system(cmd);
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}
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static void
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event_loop(void)
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{
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int rv;
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int fd;
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char buffer[1024 + 1]; /* XXX */
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fd = open("/dev/devctl", O_RDONLY); /* XXX */
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if (fd == -1)
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err(1, "Can't open devctl");
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
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err(1, "Can't set close-on-exec flag");
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while (1) {
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if (romeo_must_die)
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break;
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rv = read(fd, buffer, sizeof(buffer) - 1);
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if (rv > 0) {
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buffer[rv] = '\0';
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while (buffer[--rv] == '\n')
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buffer[rv] = '\0';
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process_event(buffer);
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} else if (rv < 0) {
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if (errno != EINTR)
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break;
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} else {
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/* EOF */
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break;
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}
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}
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close(fd);
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}
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static void
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gensighand(int foo __unused)
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{
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romeo_must_die++;
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}
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static void
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usage()
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{
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fprintf(stderr, "usage: %s [-d]", getprogname());
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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int ch;
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while ((ch = getopt(argc, argv, "d")) != -1) {
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switch (ch) {
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case 'd':
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dflag++;
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break;
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default:
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usage();
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}
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}
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reset_config();
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parse();
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if (!dflag)
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daemon(0, 0);
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event_loop();
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signal(SIGHUP, gensighand);
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signal(SIGINT, gensighand);
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signal(SIGTERM, gensighand);
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return (0);
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}
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