mirror of
https://github.com/systemd/systemd.git
synced 2024-12-23 21:35:11 +03:00
[PATCH] make udev user callable to query the database
Here is a slightly better version that prints the usage if a unknown option is given: kay@pim:~/src/udev.kay$ ./udev -x ./udev: invalid option -- x Usage: [-qrVh] -q arg query database -r print udev root -V print udev version -h print this help text > Here is a patch that makes it possible to call udev with options on the command line. > Valid options are for now: > > -V for the udev version: > kay@pim:~/src/udev.kay$ ./udev -V > udev, version 011_bk > > -r for the udev root: > kay@pim:~/src/udev.kay$ ./udev -r > /udev/ > > -q to query the database with the sysfs path for the name of the node: > kay@pim:~/src/udev.kay$ ./udev -q /class/video4linux/video0 > test/video/webcam0
This commit is contained in:
parent
c78cb204bc
commit
f4dc8d11c2
97
udev.c
97
udev.c
@ -29,6 +29,7 @@
|
||||
#include <errno.h>
|
||||
#include <ctype.h>
|
||||
#include <signal.h>
|
||||
#include <stdarg.h>
|
||||
|
||||
#include "udev.h"
|
||||
#include "udev_version.h"
|
||||
@ -81,23 +82,70 @@ static inline char *get_seqnum(void)
|
||||
return seqnum;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv, char **envp)
|
||||
static inline int udev_user(int argc, char **argv)
|
||||
{
|
||||
static const char short_options[] = "q:rVh";
|
||||
int option;
|
||||
int retval = -EINVAL;
|
||||
struct udevice dev;
|
||||
|
||||
while (1) {
|
||||
option = getopt(argc, argv, short_options);
|
||||
if (option == -1)
|
||||
break;
|
||||
|
||||
dbg("option '%c'", option);
|
||||
switch (option) {
|
||||
case 'q':
|
||||
dbg("udev query: %s\n", optarg);
|
||||
retval = udevdb_open_ro();
|
||||
if (retval != 0) {
|
||||
printf("unable to open udev database\n");
|
||||
return -1;
|
||||
}
|
||||
retval = udevdb_get_dev(optarg, &dev);
|
||||
if (retval == 0) {
|
||||
printf("%s\n", dev.name);
|
||||
} else {
|
||||
printf("device not found in udev database\n");
|
||||
}
|
||||
udevdb_exit();
|
||||
return retval;
|
||||
|
||||
case 'r':
|
||||
printf("%s\n", udev_root);
|
||||
return 0;
|
||||
|
||||
case 'V':
|
||||
printf("udev, version %s\n", UDEV_VERSION);
|
||||
return 0;
|
||||
|
||||
case 'h':
|
||||
retval = 0;
|
||||
case '?':
|
||||
default:
|
||||
goto help;
|
||||
}
|
||||
}
|
||||
|
||||
help:
|
||||
printf("Usage: [-qrVh]\n"
|
||||
" -q arg query database \n"
|
||||
" -r print udev root\n"
|
||||
" -V print udev version\n"
|
||||
" -h print this help text\n"
|
||||
"\n");
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static inline int udev_hotplug(int argc, char **argv)
|
||||
{
|
||||
char *action;
|
||||
char *devpath;
|
||||
char *subsystem;
|
||||
int retval = -EINVAL;
|
||||
|
||||
main_argv = argv;
|
||||
main_envp = envp;
|
||||
|
||||
dbg("version %s", UDEV_VERSION);
|
||||
|
||||
if (argc != 2) {
|
||||
dbg ("unknown number of arguments");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
subsystem = argv[1];
|
||||
|
||||
devpath = get_devpath();
|
||||
@ -126,9 +174,6 @@ int main(int argc, char **argv, char **envp)
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/* initialize our configuration */
|
||||
udev_init_config();
|
||||
|
||||
/* connect to the system message bus */
|
||||
sysbus_connect();
|
||||
|
||||
@ -166,3 +211,27 @@ exit_sysbus:
|
||||
exit:
|
||||
return retval;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv, char **envp)
|
||||
{
|
||||
main_argv = argv;
|
||||
main_envp = envp;
|
||||
int retval;
|
||||
|
||||
dbg("version %s", UDEV_VERSION);
|
||||
|
||||
/* initialize our configuration */
|
||||
udev_init_config();
|
||||
|
||||
if (argc == 2 && argv[1][0] != '-') {
|
||||
dbg("called by hotplug");
|
||||
retval = udev_hotplug(argc, argv);
|
||||
} else {
|
||||
dbg("called by user");
|
||||
retval = udev_user(argc, argv);
|
||||
}
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
|
||||
|
13
udevdb.c
13
udevdb.c
@ -128,3 +128,16 @@ int udevdb_init(int init_flag)
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* udevdb_init: open database for reading
|
||||
*/
|
||||
int udevdb_open_ro(void)
|
||||
{
|
||||
udevdb = tdb_open(udev_db_filename, 0, 0, O_RDONLY, 0);
|
||||
if (udevdb == NULL) {
|
||||
dbg("unable to open database at '%s'", udev_db_filename);
|
||||
return -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
1
udevdb.h
1
udevdb.h
@ -11,6 +11,7 @@
|
||||
/* function prototypes */
|
||||
extern void udevdb_exit(void);
|
||||
extern int udevdb_init(int init_flag);
|
||||
extern int udevdb_open_ro(void);
|
||||
|
||||
extern int udevdb_add_dev(const char *path, const struct udevice *dev);
|
||||
extern int udevdb_get_dev(const char *path, struct udevice *dev);
|
||||
|
Loading…
Reference in New Issue
Block a user