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ZCOM C I/F Library Routines

PTFIND (3X)

Chapter 4164

Method 3: Retrieve the next terminal whose table has a sequence of

matching bit patterns.

This mode is similar to Method 2 except that the caller also specifies a

mask buffer, which is used to mask some unused bits in the physical

terminal table before comparing with the specified data.

The mask buffer is AND’ed with the table content before comparison.

Hence, the mask buffer should contain zeros for those unused bits and

ones for those bits to be compared. The data buffer should have zeros for

those unused bits, 0 or 1 for the bits to be compared.

Similarly, the search starts from the next terminal after the specified

ZLU. (In fact, method 2 may be treated as a special case of this, if the

mask buffer contains all ones.)

The libraries libzcom_c.a and libpthread.a must be linked into the calling

program by giving the options “-lzcom_c -lpthread” to cc(1) or ld(1).

Threads

Considerations

This routine may be called from a multi-threaded application using the

POSIX (1003.1c) kernel threads API package. This routine has the

following characteristics when called by a multi-threaded application:

cancellation point Thread cancellation can occur when a thread

calls this routine.

async-cancel unsafe The calling thread’s cancelability type must be

PTHREAD_CANCEL_DEFERRED if

cancellation is enabled.

async-signal unsafe It cannot be called from a signal handler.

fork unsafe It cannot be called by a child process after

fork(2) but before exec(2).

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HP Advanced Communications Controllers (ACC) Guide de l'utilisateur Page 164