/*
- * "$Id: serial.c 5553 2006-05-20 12:22:27Z mike $"
+ * "$Id: serial.c 6170 2007-01-02 17:26:41Z mike $"
*
* Serial port backend for the Common UNIX Printing System (CUPS).
*
- * Copyright 1997-2006 by Easy Software Products, all rights reserved.
+ * Copyright 1997-2007 by Easy Software Products, all rights reserved.
*
* These coded instructions, statements, and computer programs are the
* property of Easy Software Products and are protected by Federal
*
* main() - Send a file to the printer or server.
* list_devices() - List all serial devices.
+ * side_cb() - Handle side-channel requests...
*/
/*
* Include necessary headers.
*/
-#include <cups/backend.h>
-#include <cups/cups.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <cups/string.h>
-#include <signal.h>
+#include "backend-private.h"
#ifdef __hpux
# include <sys/modem.h>
* Local functions...
*/
-void list_devices(void);
+static void list_devices(void);
+static void side_cb(int print_fd, int device_fd, int use_bc);
/*
value[255], /* Value of option */
*ptr; /* Pointer into name or value */
int port; /* Port number (not used) */
- int fp; /* Print file */
int copies; /* Number of copies to print */
- int fd; /* Parallel device */
- int rbytes; /* Number of bytes read */
- int wbytes; /* Number of bytes written */
- size_t nbytes, /* Number of bytes read */
- tbytes; /* Total number of bytes written */
+ int print_fd, /* Print file */
+ device_fd; /* Serial device */
+ int nfds; /* Maximum file descriptor value + 1 */
+ fd_set input, /* Input set for reading */
+ output; /* Output set for writing */
+ ssize_t print_bytes, /* Print bytes read */
+ bc_bytes, /* Backchannel bytes read */
+ total_bytes, /* Total bytes written */
+ bytes; /* Bytes written */
int dtrdsr; /* Do dtr/dsr flow control? */
- int bufsize; /* Size of output buffer for writes */
- char buffer[8192], /* Output buffer */
- *bufptr; /* Pointer into buffer */
+ int print_size; /* Size of output buffer for writes */
+ char print_buffer[8192], /* Print data buffer */
+ *print_ptr, /* Pointer into print data buffer */
+ bc_buffer[1024]; /* Back-channel data buffer */
struct termios opts; /* Serial port options */
struct termios origopts; /* Original port options */
- fd_set input, /* Input set for select() */
- output; /* Output set for select() */
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
struct sigaction action; /* Actions for POSIX signals */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
if (argc == 6)
{
- fp = 0;
- copies = 1;
+ print_fd = 0;
+ copies = 1;
}
else
{
* Try to open the print file...
*/
- if ((fp = open(argv[6], O_RDONLY)) < 0)
+ if ((print_fd = open(argv[6], O_RDONLY)) < 0)
{
perror("ERROR: unable to open print file");
return (CUPS_BACKEND_FAILED);
do
{
- if ((fd = open(resource, O_WRONLY | O_NOCTTY | O_EXCL | O_NDELAY)) == -1)
+ if ((device_fd = open(resource, O_RDWR | O_NOCTTY | O_EXCL |
+ O_NDELAY)) == -1)
{
if (getenv("CLASS") != NULL)
{
}
}
}
- while (fd < 0);
+ while (device_fd < 0);
fputs("STATE: -connecting-to-device\n", stderr);
* Set any options provided...
*/
- tcgetattr(fd, &origopts);
- tcgetattr(fd, &opts);
+ tcgetattr(device_fd, &origopts);
+ tcgetattr(device_fd, &opts);
- opts.c_lflag &= ~(ICANON | ECHO | ISIG); /* Raw mode */
- opts.c_oflag &= ~OPOST; /* Don't post-process */
+ opts.c_lflag &= ~(ICANON | ECHO | ISIG);
+ /* Raw mode */
+ opts.c_oflag &= ~OPOST; /* Don't post-process */
- bufsize = 96; /* 9600 baud / 10 bits/char / 10Hz */
- dtrdsr = 0; /* No dtr/dsr flow control */
+ print_size = 96; /* 9600 baud / 10 bits/char / 10Hz */
+ dtrdsr = 0; /* No dtr/dsr flow control */
- if (options != NULL)
+ if (options)
+ {
while (*options)
{
/*
* Set the baud rate...
*/
- bufsize = atoi(value) / 100;
+ print_size = atoi(value) / 100;
#if B19200 == 19200
cfsetispeed(&opts, atoi(value));
}
}
}
+ }
- tcsetattr(fd, TCSANOW, &opts);
- fcntl(fd, F_SETFL, 0);
+ tcsetattr(device_fd, TCSANOW, &opts);
+ fcntl(device_fd, F_SETFL, 0);
/*
* Now that we are "connected" to the port, ignore SIGTERM so that we
* stdin (otherwise you can't cancel raw jobs...)
*/
- if (argc < 7)
+ if (print_fd != 0)
{
#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
sigset(SIGTERM, SIG_IGN);
}
/*
- * Finally, send the print file...
+ * Figure out the maximum file descriptor value to use with select()...
*/
- if (bufsize > sizeof(buffer))
- bufsize = sizeof(buffer);
+ nfds = (print_fd > device_fd ? print_fd : device_fd) + 1;
- wbytes = 0;
+ /*
+ * Finally, send the print file. Ordinarily we would just use the
+ * backendRunLoop() function, however since we need to use smaller
+ * writes and may need to do DSR/DTR flow control, we duplicate much
+ * of the code here instead...
+ */
+
+ if (print_size > sizeof(print_buffer))
+ print_size = sizeof(print_buffer);
+
+ total_bytes = 0;
while (copies > 0)
{
copies --;
- if (fp != 0)
+ if (print_fd != 0)
{
fputs("PAGE: 1 1\n", stderr);
- lseek(fp, 0, SEEK_SET);
+ lseek(print_fd, 0, SEEK_SET);
}
- if (dtrdsr)
+ /*
+ * Now loop until we are out of data from print_fd...
+ */
+
+ for (print_bytes = 0, print_ptr = print_buffer;;)
{
/*
- * Check the port and sleep until DSR is set...
+ * Use select() to determine whether we have data to copy around...
*/
- int status;
+ FD_ZERO(&input);
+ if (!print_bytes)
+ FD_SET(print_fd, &input);
+ FD_SET(device_fd, &input);
+ FD_SET(CUPS_SC_FD, &input);
+ FD_ZERO(&output);
+ if (print_bytes)
+ FD_SET(device_fd, &output);
- if (!ioctl(fd, TIOCMGET, &status))
- if (!(status & TIOCM_DSR))
- {
- /*
- * Wait for DSR to go high...
- */
-
- fputs("DEBUG: DSR is low; waiting for device...\n", stderr);
+ if (select(nfds, &input, &output, NULL, NULL) < 0)
+ continue; /* Ignore errors here */
- do
- {
- sleep(1);
- if (ioctl(fd, TIOCMGET, &status))
- break;
- }
- while (!(status & TIOCM_DSR));
+ /*
+ * Check if we have a side-channel request ready...
+ */
- fputs("DEBUG: DSR is high; writing to device...\n", stderr);
- }
- }
+ if (FD_ISSET(CUPS_SC_FD, &input))
+ side_cb(print_fd, device_fd, 1);
- tbytes = 0;
- while ((nbytes = read(fp, buffer, bufsize)) > 0)
- {
/*
- * Write the print data to the printer...
+ * Check if we have back-channel data ready...
*/
- tbytes += nbytes;
- bufptr = buffer;
-
- while (nbytes > 0)
+ if (FD_ISSET(device_fd, &input))
{
- /*
- * See if we are ready to read or write...
- */
-
- do
+ if ((bc_bytes = read(device_fd, bc_buffer, sizeof(bc_buffer))) > 0)
{
- FD_ZERO(&input);
- FD_SET(fd, &input);
- FD_ZERO(&output);
- FD_SET(fd, &output);
- }
- while (select(fd + 1, &input, &output, NULL, NULL) < 0);
+ fprintf(stderr,
+ "DEBUG: Received " CUPS_LLFMT " bytes of back-channel data!\n",
+ CUPS_LLCAST bc_bytes);
+ cupsBackChannelWrite(bc_buffer, bc_bytes, 1.0);
+ }
+ }
+
+ /*
+ * Check if we have print data ready...
+ */
- if (FD_ISSET(fd, &input))
+ if (FD_ISSET(print_fd, &input))
+ {
+ if ((print_bytes = read(print_fd, print_buffer, print_size)) < 0)
{
/*
- * Read backchannel data...
+ * Read error - bail if we don't see EAGAIN or EINTR...
*/
- if ((rbytes = read(fd, resource, sizeof(resource))) > 0)
+ if (errno != EAGAIN || errno != EINTR)
{
- fprintf(stderr, "DEBUG: Received %d bytes of back-channel data!\n",
- rbytes);
- cupsBackChannelWrite(resource, rbytes, 1.0);
- }
+ perror("ERROR: Unable to read print data");
+
+ tcsetattr(device_fd, TCSADRAIN, &origopts);
+
+ close(device_fd);
+
+ if (print_fd != 0)
+ close(print_fd);
+
+ return (CUPS_BACKEND_FAILED);
+ }
+
+ print_bytes = 0;
+ }
+ else if (print_bytes == 0)
+ {
+ /*
+ * End of file, break out of the loop...
+ */
+
+ break;
}
- if (FD_ISSET(fd, &output))
+ print_ptr = print_buffer;
+ }
+
+ /*
+ * Check if the device is ready to receive data and we have data to
+ * send...
+ */
+
+ if (print_bytes && FD_ISSET(device_fd, &output))
+ {
+ if (dtrdsr)
{
/*
- * Write print data...
+ * Check the port and sleep until DSR is set...
*/
- if ((wbytes = write(fd, bufptr, nbytes)) < 0)
- if (errno == ENOTTY)
- wbytes = write(fd, bufptr, nbytes);
+ int status;
- if (wbytes < 0)
- {
- /*
- * Check for retryable errors...
- */
- if (errno != EAGAIN && errno != EINTR)
+ if (!ioctl(device_fd, TIOCMGET, &status))
+ if (!(status & TIOCM_DSR))
{
- perror("ERROR: Unable to send print file to printer");
- break;
- }
- }
- else
+ /*
+ * Wait for DSR to go high...
+ */
+
+ fputs("DEBUG: DSR is low; waiting for device...\n", stderr);
+
+ do
+ {
+ /*
+ * Poll every 100ms...
+ */
+
+ usleep(100000);
+
+ if (ioctl(device_fd, TIOCMGET, &status))
+ break;
+ }
+ while (!(status & TIOCM_DSR));
+
+ fputs("DEBUG: DSR is high; writing to device...\n", stderr);
+ }
+ }
+
+ if ((bytes = write(device_fd, print_ptr, print_bytes)) < 0)
+ {
+ /*
+ * Write error - bail if we don't see an error we can retry...
+ */
+
+ if (errno != EAGAIN && errno != EINTR && errno != ENOTTY)
{
- /*
- * Update count and pointer...
- */
+ perror("ERROR: Unable to write print data");
+
+ tcsetattr(device_fd, TCSADRAIN, &origopts);
+
+ close(device_fd);
- nbytes -= wbytes;
- bufptr += wbytes;
+ if (print_fd != 0)
+ close(print_fd);
+
+ return (CUPS_BACKEND_FAILED);
}
}
- }
-
- if (wbytes < 0)
- break;
+ else
+ {
+ fprintf(stderr, "DEBUG: Wrote %d bytes...\n", (int)bytes);
- if (argc > 6)
- fprintf(stderr, "INFO: Sending print file, %lu bytes...\n",
- (unsigned long)tbytes);
+ print_bytes -= bytes;
+ print_ptr += bytes;
+ total_bytes += bytes;
+ }
+ }
}
}
* Close the serial port and input file and return...
*/
- tcsetattr(fd, TCSADRAIN, &origopts);
+ tcsetattr(device_fd, TCSADRAIN, &origopts);
+
+ close(device_fd);
- close(fd);
- if (fp != 0)
- close(fp);
+ if (print_fd != 0)
+ close(print_fd);
- return (wbytes < 0 ? CUPS_BACKEND_FAILED : CUPS_BACKEND_OK);
+ return (total_bytes < 0 ? CUPS_BACKEND_FAILED : CUPS_BACKEND_OK);
}
* 'list_devices()' - List all serial devices.
*/
-void
+static void
list_devices(void)
{
#if defined(__hpux) || defined(__sgi) || defined(__sun) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
printf("serial serial:%s?baud=230400 \"Unknown\" \"USB Serial Port #%d\"\n",
device, i + 1);
}
+
+ sprintf(device, "/dev/ttyUSB%d", i);
+ if ((fd = open(device, O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0)
+ {
+ close(fd);
+ printf("serial serial:%s?baud=230400 \"Unknown\" \"USB Serial Port #%d\"\n",
+ device, i + 1);
+ }
}
for (i = 0; i < 64; i ++)
/*
- * End of "$Id: serial.c 5553 2006-05-20 12:22:27Z mike $".
+ * 'side_cb()' - Handle side-channel requests...
+ */
+
+static void
+side_cb(int print_fd, /* I - Print file */
+ int device_fd, /* I - Device file */
+ int use_bc) /* I - Using back-channel? */
+{
+ cups_sc_command_t command; /* Request command */
+ cups_sc_status_t status; /* Request/response status */
+ char data[2048]; /* Request/response data */
+ int datalen; /* Request/response data size */
+
+
+ datalen = sizeof(data);
+
+ if (cupsSideChannelRead(&command, &status, data, &datalen, 1.0))
+ {
+ fputs("WARNING: Failed to read side-channel request!\n", stderr);
+ return;
+ }
+
+ switch (command)
+ {
+ case CUPS_SC_CMD_DRAIN_OUTPUT :
+ if (tcdrain(device_fd))
+ status = CUPS_SC_STATUS_IO_ERROR;
+ else
+ status = CUPS_SC_STATUS_OK;
+
+ datalen = 0;
+ break;
+
+ case CUPS_SC_CMD_GET_BIDI :
+ data[0] = use_bc;
+ datalen = 1;
+ break;
+
+ default :
+ status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
+ datalen = 0;
+ break;
+ }
+
+ cupsSideChannelWrite(command, status, data, datalen, 1.0);
+}
+
+
+/*
+ * End of "$Id: serial.c 6170 2007-01-02 17:26:41Z mike $".
*/
projects / thirdparty / cups.git / blobdiff