chiark / gitweb /
[PATCH] Exit, if udevtest cannot open the device (segfault).
[elogind.git] / dev_d.c
1 /*
2  * dev_d.c - dev.d/ multiplexer
3  * 
4  * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
5  *
6  *      This program is free software; you can redistribute it and/or modify it
7  *      under the terms of the GNU General Public License as published by the
8  *      Free Software Foundation version 2 of the License.
9  */
10
11 /*
12  * This essentially emulates the following shell script logic in C:
13  *      DIR="/etc/dev.d"
14  *      export DEVNAME="whatever_dev_name_udev_just_gave"
15  *      for I in "${DIR}/$DEVNAME/"*.dev "${DIR}/$1/"*.dev "${DIR}/default/"*.dev ; do
16  *              if [ -f $I ]; then $I $1 ; fi
17  *      done
18  *      exit 1;
19  */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/types.h>
25 #include <sys/wait.h>
26 #include <sys/stat.h>
27 #include <unistd.h>
28 #include <fcntl.h>
29
30 #include "udev.h"
31 #include "udev_lib.h"
32 #include "udevdb.h"
33 #include "logging.h"
34
35 #define DEVD_DIR                        "/etc/dev.d/"
36 #define DEVD_SUFFIX                     ".dev"
37
38 static int run_program(char *name)
39 {
40         pid_t pid;
41         int fd;
42         char *argv[3];
43
44         dbg("running %s", name);
45
46         pid = fork();
47         switch (pid) {
48         case 0:
49                 /* child */
50                 udevdb_exit();  /* close udevdb */
51                 fd = open("/dev/null", O_RDWR);
52                 if ( fd >= 0) {
53                         dup2(fd, STDOUT_FILENO);
54                         dup2(fd, STDIN_FILENO);
55                         dup2(fd, STDERR_FILENO);
56                 }
57                 close(fd);
58
59                 argv[0] = name;
60                 argv[1] = main_argv[1];
61                 argv[2] = NULL;
62
63                 execv(name, argv);
64                 dbg("exec of child failed");
65                 _exit(1);
66         case -1:
67                 dbg("fork of child failed");
68                 break;
69                 return -1;
70         default:
71                 wait(NULL);
72         }
73
74         return 0;
75 }
76
77 /* 
78  * runs files in these directories in order:
79  *      <node name given by udev>/
80  *      subsystem/
81  *      default/
82  */
83 void dev_d_execute(struct udevice *udev)
84 {
85         char dirname[PATH_MAX];
86         char devname[NAME_SIZE];
87         char *temp;
88
89         /* skip if UDEV_NO_DEVD is set */
90         if (udev_dev_d == 0)
91                 return;
92
93         /* skip if udev did nothing, like unchanged netif or no "dev" file */
94         if (udev->devname[0] == '\0')
95                 return;
96
97         /* add the node name or the netif name to the environment */
98         setenv("DEVNAME", udev->devname, 1);
99         dbg("DEVNAME='%s'", udev->devname);
100
101         strfieldcpy(devname, udev->name);
102
103         /* Chop the device name up into pieces based on '/' */
104         temp = strchr(devname, '/');
105         while (temp != NULL) {
106                 temp[0] = '\0';
107                 strcpy(dirname, DEVD_DIR);
108                 strfieldcat(dirname, devname);
109                 call_foreach_file(run_program, dirname, DEVD_SUFFIX);
110
111                 temp[0] = '/';
112                 ++temp;
113                 temp = strchr(temp, '/');
114         }
115
116         strcpy(dirname, DEVD_DIR);
117         strfieldcat(dirname, udev->name);
118         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
119
120         strcpy(dirname, DEVD_DIR);
121         strfieldcat(dirname, udev->subsystem);
122         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
123
124         strcpy(dirname, DEVD_DIR "default");
125         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
126 }