?? update.c
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/* update - do sync periodically Author: Andy Tanenbaum */#include <sys/types.h>#include <signal.h>#include <unistd.h>_PROTOTYPE(int main, (void));int main(){ /* Release all (?) open file descriptors. */ close(0); close(1); close(2); /* Release current directory to avoid locking current device. */ chdir("/"); /* Flush the cache every 30 seconds. */ while (1) { sync(); sleep(30); }}?? 快捷鍵說明
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