getc help needed, using rdchk()

[Jeff Mo]

tmm33 at leah.Albany.Edu (Terry McCoy) writes:
>Does anyone known what would be needed to create a function similar to getc()
>that would return control to the calling function if the buffer was empty.

Under SCO Xenix 2.2.x and 2.3.x, a call to rdchk(file_descriptor)
will return a 1 if the process will not block on a read(),
or if it's at EOF.  To use:
    if (rdchk(file_des) > 0)
        read(file_des, buffer, nbytes);

Jeff Mo, Vision-Ease MIS department, Optifacts division.  St. Cloud, MN, USA

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