alema/hkd
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check if hkd is already running before start

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use a lock file to determine if another instance of hkd is already running
This commit is contained in:
Alessandro Mauri 2020-09-05 19:55:11 +02:00
parent 633604cefa
commit 38a72338ed
1 changed files with 24 additions and 0 deletions

24
hkd.c
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@ -16,6 +16,7 @@
#include <sys/inotify.h>
#include <wordexp.h>
#include <ctype.h>
#include <sys/stat.h>
/* Value defines */
#define FILE_NAME_MAX_LENGTH 255
@ -206,6 +207,7 @@ struct hotkey_list_e {
struct hotkey_list_e *hotkey_list = NULL;
const char evdev_root_dir[] = "/dev/input/";
const char lock_file[] = "/tmp/hkd.lock";
unsigned long hotkey_size_mask = 0;
char *ext_config_file = NULL;
/* Flags */
@ -223,6 +225,7 @@ void int_handler (int signum);
void exec_command (char *);
void parse_config_file (void);
void update_descriptors_list (int **, int *);
void remove_lock (void);
int prepare_epoll (int *, int, int);
unsigned short key_to_code (char *);
/* hotkey list operations */
@ -231,6 +234,21 @@ void hotkey_list_destroy (struct hotkey_list_e *);
int main (int argc, char *argv[])
{
/* Check if hkd is already running */
int lock_file_descriptor;
struct flock fl;
lock_file_descriptor = open(lock_file, O_RDWR | O_CREAT, 0600);
if (lock_file_descriptor < 0)
die("can't open lock file");
fl.l_start = 0;
fl.l_len = 0;
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
if (fcntl(lock_file_descriptor, F_SETLK, &fl) < 0)
die("hkd is already running");
atexit(remove_lock);
/* Handle SIGINT */
dead = 0;
struct sigaction action;
@ -361,6 +379,7 @@ int main (int argc, char *argv[])
// TODO: better child handling, for now all children receive the same
// interrupts as the father so everything should work fine
remove(lock_file);
wait(NULL);
if (!dead)
fprintf(stderr, red("an error occured\n"));
@ -860,3 +879,8 @@ unsigned short key_to_code (char *key)
}
return 0;
}
void remove_lock (void)
{
unlink(lock_file);
}