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System Settings & Primitives

This section lists the possible settings for the system and the few primitives provided by $\mathcal{P}$$e$$\mathcal{S}$$t$$\mathcal{O}$ that do not fall into the file operation category.

The system settings:

• TIMESKEW_MAX in "pesto.h": This is the maximum time skew. If it is not the case that $\vert TS\vert\leq$ TIMESKEW_MAX (where $TS$ is the estimated time skew) then the client's clock is drifting too much with respect to the server's clock.
• LOG & LOGFILE in "ppserver.h": Should the server keep a log of the received requests?

Other possibilities are (but these are not implemented): maximum readlock and writelock expiration time bounds.

The system primitives are:

• long p_time(flag)
  returns estimated server time or (long)NOT_OK.
• int p_comm()
  returns CONNECTED, WEAKLY_CONNECTED, DISCONNECTED, or NOT_OK.
• void p_perror(char *str)

The flag used as parameter to p_time should be GET_TIME or SET_TIME. If SET_TIME then the client's time will be set to the estimated server time.

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