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/*
* "$Id: scsi-linux.c 177 2006-06-21 00:20:03Z jlovell $"
*
* Linux SCSI printer support for the Common UNIX Printing System (CUPS).
*
* Copyright 2003-2005 by Easy Software Products, all rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* 3. All advertising materials mentioning features or use
* of this software must display the following
* acknowledgement:
*
* This product includes software developed by Easy
* Software Products.
*
* 4. The name of Easy Software Products may not be used to
* endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* Contents:
*
* list_devices() - List the available SCSI printer devices.
* print_device() - Print a file to a SCSI device.
*/
/*
* Include necessary headers.
*/
#include <scsi/sg.h>
/*
* We currently only support the Linux 2.4 generic SCSI interface.
*/
#ifndef SG_DXFER_TO_DEV
/*
* Dummy functions that do nothing on unsupported platforms...
*/
void list_devices(void) {}
int print_device(const char *resource, int fd, int copies) { return (1); }
#else
/*
* 'list_devices()' - List the available SCSI printer devices.
*/
void
list_devices(void)
{
puts("direct scsi \"Unknown\" \"SCSI Printer\"");
}
/*
* 'print_device()' - Print a file to a SCSI device.
*/
int /* O - Print status */
print_device(const char *resource, /* I - SCSI device */
int fd, /* I - File to print */
int copies) /* I - Number of copies to print */
{
int scsi_fd; /* SCSI file descriptor */
char buffer[8192]; /* Data buffer */
int bytes; /* Number of bytes */
int try; /* Current try */
sg_io_hdr_t scsi_req; /* SCSI request */
unsigned char scsi_cmd[6], /* SCSI command data */
scsi_sense[32]; /* SCSI sense data */
# if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
struct sigaction action; /* Actions for POSIX signals */
# endif /* HAVE_SIGACTION && !HAVE_SIGSET */
/*
* Make sure we have a valid resource name...
*/
if (strncmp(resource, "/dev/sg", 7) != 0)
{
fprintf(stderr, "ERROR: Bad SCSI device file \"%s\"!\n", resource);
return (CUPS_BACKEND_STOP);
}
/*
* Open the SCSI device file...
*/
fputs("STATE: +connecting-to-device\n", stderr);
do
{
if ((scsi_fd = open(resource, O_RDWR | O_EXCL)) == -1)
{
if (getenv("CLASS") != NULL)
{
/*
* If the CLASS environment variable is set, the job was submitted
* to a class and not to a specific queue. In this case, we want
* to abort immediately so that the job can be requeued on the next
* available printer in the class.
*/
fputs("INFO: Unable to open SCSI device, queuing on next printer in class...\n",
stderr);
/*
* Sleep 5 seconds to keep the job from requeuing too rapidly...
*/
sleep(5);
return (CUPS_BACKEND_FAILED);
}
if (errno != EAGAIN && errno != EBUSY)
{
fprintf(stderr, "ERROR: Unable to open SCSI device \"%s\" - %s\n",
resource, strerror(errno));
return (CUPS_BACKEND_FAILED);
}
else
{
fprintf(stderr, "INFO: SCSI device \"%s\" busy; retrying...\n",
resource);
sleep(30);
}
}
}
while (scsi_fd == -1);
fputs("STATE: -connecting-to-device\n", stderr);
/*
* Now that we are "connected" to the port, ignore SIGTERM so that we
* can finish out any page data the driver sends (e.g. to eject the
* current page... Only ignore SIGTERM if we are printing data from
* stdin (otherwise you can't cancel raw jobs...)
*/
if (fd != 0)
{
# ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
sigset(SIGTERM, SIG_IGN);
# elif defined(HAVE_SIGACTION)
memset(&action, 0, sizeof(action));
sigemptyset(&action.sa_mask);
action.sa_handler = SIG_IGN;
sigaction(SIGTERM, &action, NULL);
# else
signal(SIGTERM, SIG_IGN);
# endif /* HAVE_SIGSET */
}
/*
* Copy the print file to the device...
*/
while (copies > 0)
{
if (fd != 0)
lseek(fd, 0, SEEK_SET);
while ((bytes = read(fd, buffer, sizeof(buffer))) > 0)
{
memset(&scsi_req, 0, sizeof(scsi_req));
scsi_req.interface_id = 'S';
scsi_req.dxfer_direction = SG_DXFER_TO_DEV;
scsi_req.cmd_len = 6;
scsi_req.mx_sb_len = sizeof(scsi_sense);
scsi_req.iovec_count = 0;
scsi_req.dxfer_len = bytes;
scsi_req.dxferp = buffer;
scsi_req.cmdp = scsi_cmd;
scsi_req.sbp = scsi_sense;
scsi_req.timeout = 60 * 1000;
scsi_cmd[0] = 0x0a; /* Group 0 print command */
scsi_cmd[1] = 0x00;
scsi_cmd[2] = bytes / 65536;
scsi_cmd[3] = bytes / 256;
scsi_cmd[4] = bytes;
scsi_cmd[5] = 0x00;
for (try = 0; try < 10; try ++)
if (ioctl(scsi_fd, SG_IO, &scsi_req) < 0 ||
scsi_req.status != 0)
{
fprintf(stderr, "WARNING: SCSI command timed out (%d); retrying...\n",
scsi_req.status);
sleep(try + 1);
}
else
break;
if (try >= 10)
{
fprintf(stderr, "ERROR: Unable to send print data (%d)\n",
scsi_req.status);
close(scsi_fd);
return (CUPS_BACKEND_FAILED);
}
}
copies --;
}
/*
* Close the device and return...
*/
close(fd);
return (CUPS_BACKEND_OK);
}
#endif /* !SG_DXFER_TO_DEV */
/*
* End of "$Id: scsi-linux.c 177 2006-06-21 00:20:03Z jlovell $".
*/
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