183 lines
4.4 KiB
Diff
183 lines
4.4 KiB
Diff
--- cups-1.3b1/backend/runloop.c.usb-paperout 2007-07-11 22:46:42.000000000 +0100
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+++ cups-1.3b1/backend/runloop.c 2007-07-18 11:40:45.000000000 +0100
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@@ -135,6 +135,14 @@
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}
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+#ifdef __linux
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+#include <sys/ioctl.h>
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+#include <linux/lp.h>
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+#include <time.h>
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+int linux_usb_paperout_hack = 0;
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+#endif /* __linux */
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+
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+
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/*
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* 'backendRunLoop()' - Read and write print and back-channel data.
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*/
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@@ -161,6 +169,9 @@
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#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
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struct sigaction action; /* Actions for POSIX signals */
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#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
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+#ifdef __linux
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+ time_t last_write = 0; /* Last time write() succeeded */
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+#endif /* __linux */
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fprintf(stderr,
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@@ -210,8 +221,6 @@
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FD_ZERO(&input);
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if (!print_bytes)
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FD_SET(print_fd, &input);
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- if (use_bc)
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- FD_SET(device_fd, &input);
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if (side_cb)
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FD_SET(CUPS_SC_FD, &input);
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@@ -221,7 +230,10 @@
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if (use_bc || side_cb)
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{
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- if (select(nfds, &input, &output, NULL, NULL) < 0)
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+ struct timeval fives;
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+ fives.tv_sec = 5;
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+ fives.tv_usec = 0;
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+ if (select(nfds, &input, &output, NULL, &fives) < 0)
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{
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/*
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* Pause printing to clear any pending errors...
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@@ -256,14 +268,24 @@
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* Check if we have back-channel data ready...
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*/
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- if (FD_ISSET(device_fd, &input))
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+ if (use_bc && FD_ISSET(device_fd, &output)) /* finished writing */
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{
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- if ((bc_bytes = read(device_fd, bc_buffer, sizeof(bc_buffer))) > 0)
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+ struct timeval nowait;
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+ fd_set readback;
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+ FD_ZERO (&readback);
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+ nowait.tv_sec = 0;
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+ nowait.tv_usec = 0;
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+ FD_SET(device_fd, &readback);
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+ if (select (device_fd + 1, &readback, NULL, NULL, &nowait) &&
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+ FD_ISSET(device_fd, &readback))
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{
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- fprintf(stderr,
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- "DEBUG: Received " CUPS_LLFMT " bytes of back-channel data!\n",
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- CUPS_LLCAST bc_bytes);
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- cupsBackChannelWrite(bc_buffer, bc_bytes, 1.0);
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+ if ((bc_bytes = read(device_fd, bc_buffer, sizeof(bc_buffer))) > 0)
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+ {
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+ fprintf(stderr,
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+ "DEBUG: Received " CUPS_LLFMT " bytes of back-channel data!\n",
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+ CUPS_LLCAST bc_bytes);
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+ cupsBackChannelWrite(bc_buffer, bc_bytes, 1.0);
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+ }
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}
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}
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@@ -334,6 +356,10 @@
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offline = 1;
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}
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}
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+ else if (linux_usb_paperout_hack && errno == EAGAIN)
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+ {
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+ sleep (1);
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+ }
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else if (errno != EAGAIN && errno != EINTR && errno != ENOTTY)
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{
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fprintf(stderr, _("ERROR: Unable to write print data: %s\n"),
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@@ -343,6 +369,9 @@
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}
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else
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{
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+#ifdef __linux
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+ last_write = time (NULL);
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+#endif /* __linux */
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if (paperout)
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{
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fputs("STATE: -media-empty-error\n", stderr);
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@@ -363,7 +392,42 @@
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total_bytes += bytes;
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}
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}
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+
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+#ifdef __linux
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+ if (linux_usb_paperout_hack)
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+ {
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+ time_t now;
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+ if (!paperout &&
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+ ((now = time(NULL)) - last_write) >= 5)
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+ {
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+ unsigned int status;
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+ if (ioctl (device_fd, LPGETSTATUS, &status) == 0 &&
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+ (status & LP_POUTPA))
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+ {
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+ fputs("ERROR: Out of paper!\n", stderr);
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+ fputs("STATE: +media-empty-error\n", stderr);
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+ paperout = 1;
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+ }
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+
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+ /* Don't check status for another 5s. */
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+ last_write = now;
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+ }
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+ }
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+#endif /* __linux */
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+ }
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+
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+#ifdef __linux
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+ if (linux_usb_paperout_hack)
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+ {
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+ /* Wait for the last write() to finish. */
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+ do
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+ {
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+ FD_ZERO(&output);
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+ FD_SET(device_fd, &output);
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+ } while (select(device_fd + 1, NULL, &output, NULL, NULL) < 0 &&
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+ errno == EINTR);
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}
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+#endif /* __linux */
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/*
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* Return with success...
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--- cups-1.3b1/backend/usb-unix.c.usb-paperout 2007-07-18 11:39:32.000000000 +0100
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+++ cups-1.3b1/backend/usb-unix.c 2007-07-18 11:39:32.000000000 +0100
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@@ -31,6 +31,11 @@
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#include "ieee1284.c"
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#include <sys/select.h>
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+#ifdef __linux
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+#include <unistd.h>
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+#include <fcntl.h>
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+extern int linux_usb_paperout_hack;
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+#endif /* __linux */
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/*
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* Local functions...
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@@ -63,6 +68,11 @@
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(void)argc;
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(void)argv;
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+#ifdef __linux
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+ /* Get the runloop to check for USB paper-out condition. */
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+ linux_usb_paperout_hack = 1;
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+#endif /* __linux */
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+
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/*
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* Open the USB port device...
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*/
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@@ -156,6 +166,12 @@
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tcsetattr(device_fd, TCSANOW, &opts);
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+#ifdef __linux
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+ /* Put the file descriptor into non-blocking mode so that we
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+ * get a chance to detect paper-out. */
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+ fcntl (device_fd, F_SETFL, fcntl (device_fd, F_GETFL) | O_NONBLOCK);
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+#endif /* __linux */
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+
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/*
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* Finally, send the print file...
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*/
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