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Top Forums Programming Telling apart serial from // port Post 40991 by starless on Friday 26th of September 2003 11:13:20 AM
Old 09-26-2003
Telling apart serial from // port

I'm writing a journal_write() function and I want it to:
- be a possible drop in replacement for write()
- write entries to the journal ;-) Could be a regular file (journal.txt), a serial printer or a // printer.
- handle printer status if needed.
fstat() tells weather or not we're dealing with a regular file. So far so good. Now, how can I tell the difference between a serial and a // port?
Once this is done, how can I get the // printer status the way stty does? (I currently do it using a non-ANSI, non-POSIX devctl() call...)

OS: QNX 6.2.1 on x86

TIA
 

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curs_print(3X)															    curs_print(3X)

NAME
mcprint - ship binary data to printer SYNOPSIS
#include <curses.h> int mcprint(char *data, int len); DESCRIPTION
This function uses the mc5p or mc4 and mc5 capabilities, if they are present, to ship given data to a printer attached to the terminal. Note that the mcprint code has no way to do flow control with the printer or to know how much buffering it has. Your application is responsible for keeping the rate of writes to the printer below its continuous throughput rate (typically about half of its nominal cps rating). Dot-matrix printers and 6-page-per-minute lasers can typically handle 80cps, so a good conservative rule of thumb is to sleep for a second after shipping each 80-character line. RETURN VALUE
The mcprint function returns ERR if the write operation aborted for some reason. In this case, errno will contain either an error associ- ated with write(2) or one of the following: ENODEV Capabilities for printer redirection do not exist. ENOMEM Couldn't allocate sufficient memory to buffer the printer write. When mcprint succeeds, it returns the number of characters actually sent to the printer. PORTABILITY
The mcprint call was designed for ncurses(3X), and is not found in SVr4 curses, 4.4BSD curses, or any other previous version of curses. BUGS
Padding in the mc5p, mc4 and mc5 capabilities will not be interpreted. SEE ALSO
curses(3X) curs_print(3X)
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