53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
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/**
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* === DO NOT MODIFY THIS FILE ===
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* If you need some other prototypes or constants in a header, please put them
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* in another header file.
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*
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* When we grade, we will be replacing this file with our own copy.
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* You have been warned.
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* === DO NOT MODIFY THIS FILE ===
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*/
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#ifndef TU_H
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#define TU_H
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/*
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* Structure types representing objects manipulated by the TU module.
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*
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* TU: Represents the current state of a telephone unit.
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*
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* NOTE: These types are "opaque": the actual structure definitions are not
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* given here and it is not intended that a client of the TU module should
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* know what they are. The actual structure definitions are local to the
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* implementation of the TU module and are not exported.
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*/
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typedef struct tu TU;
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/*
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* The possible states that a TU can be in.
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*/
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typedef enum tu_state {
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TU_ON_HOOK, TU_RINGING, TU_DIAL_TONE, TU_RING_BACK, TU_BUSY_SIGNAL,
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TU_CONNECTED, TU_ERROR
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} TU_STATE;
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/*
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* Array that specifies a printable name for each of the TU states.
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* These names should be used when sending state-change notifications to
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* the underlying network clients. They may also be used for debugging
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* purposes.
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*/
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extern char *tu_state_names[];
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TU *tu_init(int fd);
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void tu_ref(TU *tu, char *reason);
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void tu_unref(TU *tu, char *reason);
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int tu_fileno(TU *tu);
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int tu_extension(TU *tu);
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int tu_set_extension(TU *tu, int ext);
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int tu_pickup(TU *tu);
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int tu_hangup(TU *tu);
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int tu_dial(TU *tu, TU *target);
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int tu_chat(TU *tu, char *msg);
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#endif
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