static bool ga_open_pidfile(const char *pidfile) { int pidfd; char pidstr[32]; pidfd = open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR); if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) { g_critical("Cannot lock pid file, %s", strerror(errno)); if (pidfd != -1) { close(pidfd); } return false; } if (ftruncate(pidfd, 0) || lseek(pidfd, 0, SEEK_SET)) { g_critical("Failed to truncate pid file"); goto fail; } sprintf(pidstr, "%d", getpid()); if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) { g_critical("Failed to write pid file"); goto fail; } return true; fail: unlink(pidfile); return false; }