bbslink2.c

里面    if (read(lockfd, buf, sizeof buf) > 0 &&
        (pid = atoi(buf)) > 0 && kill(pid, 0) == 0) {
        if (KillFormerBBSLINK) {
        kill(pid, SIGTERM);
        unlink(LockFile);
        } else {
        fprintf(stderr, "another process [%d] running\n", pid);
        return 0;
        }
    } else {
        fprintf(stderr, "no process [%d] running, but lock file existed, unlinked\n", pid);
        unlink(LockFile);
    }
    close(lockfd);
    }
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