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#ifndef _FD_SIGNAL_H_
#define _FD_SIGNAL_H_
#define SIGNAL_OK (0)
#define SIGNAL_TIMEOUT (-2)
#define SIGNAL_ERROR (-1)
typedef struct _dnbd3_signal dnbd3_signal_t;
/**
* Create a new signal, nonblocking.
* @return NULL on error, pointer to dnbd3_signal_t on success.
*/
dnbd3_signal_t* signal_new();
/**
* Create a new signal, blocking.
* @return NULL on error, pointer to dnbd3_signal_t on success.
*/
dnbd3_signal_t* signal_newBlocking();
/**
* Trigger the given signal, so a wait or clear call will succeed.
* @return SIGNAL_OK on success, SIGNAL_ERROR on error
*/
int signal_call(const dnbd3_signal_t* const signal);
/**
* Wait for given signal, with an optional timeout.
* If timeout == 0, just poll once.
* If timeout < 0, wait forever.
* @return > 0 telling how many times the signal was called,
* SIGNAL_TIMEOUT if the timeout was reached,
* SIGNAL_ERROR if some error occured
*/
int signal_wait(const dnbd3_signal_t* const signal, int timeoutMs);
/**
* Clears any pending signals on this signal.
* @return number of signals that were pending,
* SIGNAL_ERROR if some error occured
*/
int signal_clear(const dnbd3_signal_t* const signal);
/**
* Close the given signal.
*/
void signal_close(const dnbd3_signal_t* const signal);
/**
* Get a file descriptor for the given signal that can be
* waited on using poll or similar.
* @return -1 if the signal is invalid
*/
int signal_getWaitFd(const dnbd3_signal_t* const signal);
#endif
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