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- phandler - generic parallel printer driver
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- _p_h_a_n_d_l_e_r ----PPPP pppprrrriiiinnnntttteeeerrrrnnnnaaaammmmeeee [ options ] [ inputfile ]
-
- Where [ options ] consist of one or more of:
- [ ----eeee ]
- [ ----ssss ]
- [ ----wwww ]
- [ ----DDDD ]
- [ ----LLLL logfilename ]
- [ ----RRRR ]
- [ ----BBBB buffersize ]
- [ ----IIII ]
- [ ----uuuu ]
- [ ----SSSS papersize ]
- [ ----dddd ]
- [ ----KKKK ]
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- The _p_h_a_n_d_l_e_r driver is a generic driver for printers attached to the
- built-in (/dev/plp*) parallel port. _p_h_a_n_d_l_e_r uses _l_i_b_p_o_d(_3) functions to
- keep the printer object database (POD) current, provide feedback on any
- engine errors encountered, and to serve as an example program for
- developers. The source for phandler is part of the _I_m_p_r_e_s_s_a_r_i_o
- _D_e_v_e_l_o_p_e_r'_s _K_i_t.
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- The driver opens and maintains the POD files for the specified printer.
- The file <_p_r_i_n_t_e_r_n_a_m_e>._c_o_n_f_i_g contains the detailed information on the
- printer's capabilities, <_p_r_i_n_t_e_r_n_a_m_e>._s_t_a_t_u_s contains the information on
- operational status of the printer, and <_p_r_i_n_t_e_r_n_a_m_e>._l_o_g contains the
- information on print job history. For more information on printer
- database files refer to the _l_i_b_p_o_d(_3) man page.
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- While _p_h_a_n_d_l_e_r has the port open, it performs an advisory file lock on
- the parallel port, thereby ensuring that only one _p_h_a_n_d_l_e_r accesses the
- printer at a time.
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- _p_h_a_n_d_l_e_r also creates a child process to update the POD printer status
- database. This child is killed automatically upon the parent's death.
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- _p_h_a_n_d_l_e_r assumes that its input is coming from standard input
- (stdin) unless a filename is specified after any and all
- command line options.
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- ----PPPP _p_r_i_n_t_e_r_n_a_m_e
- specifies the printer with which _p_h_a_n_d_l_e_r is communicating.
- _p_r_i_n_t_e_r_n_a_m_e is the name under which the System VR3 spooler
- recognizes the printer, as given on the _l_p(_1) command line.
- This option is required.
-
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- ----eeee specifies that driver should exit immediately on fault. By
- default, the driver waits indefinitely for faults to clear,
- retrying any errors every several seconds, where the exact
- number of seconds is defined in the POD config database entry
- _e_r_r_o_r__r_e_t_r_y__w_a_i_t.
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- ----ssss specifies that the driver should exit after ascertaining
- printer status and updating the POD status file. If an error
- is encountered, however, _p_h_a_n_d_l_e_r will block unless the ----eeee
- switch is given as well. If a quick status update is what you
- want, invoke _p_h_a_n_d_l_e_r with both the ----ssss and the ----eeee options to
- insure that _p_h_a_n_d_l_e_r exits promptly.
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- ----wwww Specify this flag to suppress warning messages in the printer
- status file. By default, warning messages such as "low on ink"
- or other non-fatal errors are written to the printer status
- file.
-
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- ----DDDD Turns on debugging information. Four levels of debugging
- information are supported: none, coarse detail, medium detail,
- and fine detail. These correspond to 0, 1, 2, and 3 or more ----DDDD
- switches given on the command line. That is, multiple -D
- options given on the command line result in progressively more
- detailed debugging information.
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- ----LLLL _l_o_g_f_i_l_e_n_a_m_e
- specifies a filename to which error and debug information
- should be appended. If this option is not specified, error and
- debug information is appended to _p_h_a_n_d_l_e_r'_s standard error
- (stderr), which is generally redirected by the System VR3
- spooler to /_v_a_r/_s_p_o_o_l/_l_p/_l_o_g.
-
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- ----RRRR specifies that the parallel port should be reset immediately
- after opening it. This may have detrimental effects on some
- printers, which may go offline for extended periods of time,
- and therefore the ----RRRR option should be used with care.
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- ----BBBB _b_u_f_f_e_r_s_i_z_e
- specifies a positive number of bytes to buffer on each read and
- write. Setting the _b_u_f_f_e_r_s_i_z_e to 1 (one) results in single-
- byte reads and writes, which can be very inefficient. It is
- recommended that if this option is specified, the _b_u_f_f_e_r_s_i_z_e be
- an integral multiple of the system block size.
-
-
- ----IIII if specified enables sensing of EOI pin on the parallel port
- (which is normally ignored).
-
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- ----uuuu if specified the parallel port status is ignored. Only valid
- when ----ssss is specified.
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- ----SSSS _p_a_p_e_r_s_i_z_e
- if specified the POD database will be updated with the paper
- size. Valid paper sizes are listed in /usr/include/pod.h.
-
-
- ----dddd if specified, the driver will send a Control-D character at end
- of job. Some printers use this to determine that the end of
- the input stream has been reached.
-
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- ----KKKK Ignore Interrupts. If specified, phandler will ignore
- interrupts and will continue to send output to the parallel
- port until end-of-file is encountered on standard input. If
- _p_h_a_n_d_l_e_r receives a job cancellation (SIGTERM) signal it will
- continue to read the input until end of file is reached and
- will discard the input (it will not be sent to the printer).
- This means that if a printer is unable to accept data,
- cancelling the job may not kill the _p_h_a_n_d_l_e_r process
- immediately. To do so, you must explicitly kill the process
- with SIGKILL (9), or reboot the machine. If a problem is
- detected on the parallel port then phandler will continue to
- run until the problem clears (this prevents subsequent print
- jobs from being sent to the parallel port until the problem is
- cleared).
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- lp(1), lpadmin(1), libpod(3), libspool(3), printstatus(1), printpanel(1).
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