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Implement singleton locking for POSIX.

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This commit is contained in:
Ruben De Smet 2016-01-06 11:56:57 +01:00
parent afc89195aa
commit e9ed444387
1 changed files with 28 additions and 2 deletions
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30
src/platform/posix.c
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@ -43,9 +43,10 @@
#include <sys/time.h>
#include <time.h>
#include <fts.h>
#include <sys/file.h>
// The name of the mutex used to prevent multiple instances of the game from running
#define SINGLE_INSTANCE_MUTEX_NAME "RollerCoaster Tycoon 2_GSKMUTEX"
#define SINGLE_INSTANCE_MUTEX_NAME "openrct2.lock"
#define FILE_BUFFER_SIZE 4096
@ -226,7 +227,32 @@ bool platform_directory_delete(const utf8 *path)
bool platform_lock_single_instance()
{
STUB();
char pidFilePath[MAX_PATH];
char separator = platform_get_path_separator();
strncpy(pidFilePath, _userDataDirectoryPath, MAX_PATH);
strncat(pidFilePath, &separator, 1);
strncat(pidFilePath, SINGLE_INSTANCE_MUTEX_NAME,
MAX_PATH - strnlen(pidFilePath, MAX_PATH) - 1);
// We will never close this file manually. The operating system will
// take care of that, because flock keeps the lock as long as the
// file is open and closes it automatically on file close.
// This is intentional.
int pidFile = open(pidFilePath, O_CREAT | O_RDWR, 0666);
if (pidFile == -1) {
log_warning("Cannot open lock file for writing.");
return false;
}
if (flock(pidFile, LOCK_EX | LOCK_NB) == -1) {
if (errno == EWOULDBLOCK) {
log_warning("Another OpenRCT2 session has been found running.");
return false;
}
log_error("flock returned an uncatched errno: %d", errno);
return false;
}
return true;
}