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ef416fc2 | 1 | /* |
2e4ff8af | 2 | * "$Id: scsi-linux.c 6834 2007-08-22 18:29:25Z mike $" |
ef416fc2 | 3 | * |
4 | * Linux SCSI printer support for the Common UNIX Printing System (CUPS). | |
5 | * | |
bc44d920 | 6 | * Copyright 2007 by Apple Inc. |
ef416fc2 | 7 | * Copyright 2003-2005 by Easy Software Products, all rights reserved. |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or | |
10 | * without modification, are permitted provided that the | |
11 | * following conditions are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above | |
14 | * copyright notice, this list of conditions and the | |
15 | * following disclaimer. | |
16 | * | |
17 | * 2. Redistributions in binary form must reproduce the | |
18 | * above copyright notice, this list of conditions and | |
19 | * the following disclaimer in the documentation and/or | |
20 | * other materials provided with the distribution. | |
21 | * | |
22 | * 3. All advertising materials mentioning features or use | |
23 | * of this software must display the following | |
24 | * acknowledgement: | |
25 | * | |
26 | * This product includes software developed by Easy | |
27 | * Software Products. | |
28 | * | |
29 | * 4. The name of Easy Software Products may not be used to | |
30 | * endorse or promote products derived from this software | |
31 | * without specific prior written permission. | |
32 | * | |
33 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS | |
34 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, | |
35 | * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
36 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
37 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS | |
38 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
39 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
40 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
41 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
42 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
43 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE | |
44 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
45 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | |
46 | * DAMAGE. | |
47 | * | |
48 | * Contents: | |
49 | * | |
50 | * list_devices() - List the available SCSI printer devices. | |
51 | * print_device() - Print a file to a SCSI device. | |
52 | */ | |
53 | ||
54 | /* | |
55 | * Include necessary headers. | |
56 | */ | |
57 | ||
58 | #include <scsi/sg.h> | |
c0e1af83 | 59 | #include <cups/i18n.h> |
ef416fc2 | 60 | |
61 | ||
62 | /* | |
63 | * We currently only support the Linux 2.4 generic SCSI interface. | |
64 | */ | |
65 | ||
66 | #ifndef SG_DXFER_TO_DEV | |
67 | /* | |
68 | * Dummy functions that do nothing on unsupported platforms... | |
69 | */ | |
70 | void list_devices(void) {} | |
71 | int print_device(const char *resource, int fd, int copies) { return (1); } | |
72 | #else | |
73 | ||
74 | ||
75 | /* | |
76 | * 'list_devices()' - List the available SCSI printer devices. | |
77 | */ | |
78 | ||
79 | void | |
80 | list_devices(void) | |
81 | { | |
82 | puts("direct scsi \"Unknown\" \"SCSI Printer\""); | |
83 | } | |
84 | ||
85 | ||
86 | /* | |
87 | * 'print_device()' - Print a file to a SCSI device. | |
88 | */ | |
89 | ||
90 | int /* O - Print status */ | |
91 | print_device(const char *resource, /* I - SCSI device */ | |
92 | int fd, /* I - File to print */ | |
93 | int copies) /* I - Number of copies to print */ | |
94 | { | |
95 | int scsi_fd; /* SCSI file descriptor */ | |
96 | char buffer[8192]; /* Data buffer */ | |
97 | int bytes; /* Number of bytes */ | |
98 | int try; /* Current try */ | |
99 | sg_io_hdr_t scsi_req; /* SCSI request */ | |
100 | unsigned char scsi_cmd[6], /* SCSI command data */ | |
101 | scsi_sense[32]; /* SCSI sense data */ | |
102 | # if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) | |
103 | struct sigaction action; /* Actions for POSIX signals */ | |
104 | # endif /* HAVE_SIGACTION && !HAVE_SIGSET */ | |
105 | ||
106 | ||
107 | /* | |
108 | * Make sure we have a valid resource name... | |
109 | */ | |
110 | ||
111 | if (strncmp(resource, "/dev/sg", 7) != 0) | |
112 | { | |
db1f069b MS |
113 | _cupsLangPrintf(stderr, _("ERROR: Bad SCSI device file \"%s\"!\n"), |
114 | resource); | |
ef416fc2 | 115 | return (CUPS_BACKEND_STOP); |
116 | } | |
117 | ||
118 | /* | |
119 | * Open the SCSI device file... | |
120 | */ | |
121 | ||
757d2cad | 122 | fputs("STATE: +connecting-to-device\n", stderr); |
123 | ||
ef416fc2 | 124 | do |
125 | { | |
126 | if ((scsi_fd = open(resource, O_RDWR | O_EXCL)) == -1) | |
127 | { | |
128 | if (getenv("CLASS") != NULL) | |
129 | { | |
130 | /* | |
131 | * If the CLASS environment variable is set, the job was submitted | |
132 | * to a class and not to a specific queue. In this case, we want | |
133 | * to abort immediately so that the job can be requeued on the next | |
134 | * available printer in the class. | |
135 | */ | |
136 | ||
c0e1af83 | 137 | _cupsLangPuts(stderr, |
138 | _("INFO: Unable to contact printer, queuing on next " | |
139 | "printer in class...\n")); | |
ef416fc2 | 140 | |
141 | /* | |
142 | * Sleep 5 seconds to keep the job from requeuing too rapidly... | |
143 | */ | |
144 | ||
145 | sleep(5); | |
146 | ||
147 | return (CUPS_BACKEND_FAILED); | |
148 | } | |
149 | ||
150 | if (errno != EAGAIN && errno != EBUSY) | |
151 | { | |
db1f069b MS |
152 | _cupsLangPrintf(stderr, |
153 | _("ERROR: Unable to open device file \"%s\": %s\n"), | |
154 | resource, strerror(errno)); | |
ef416fc2 | 155 | return (CUPS_BACKEND_FAILED); |
156 | } | |
157 | else | |
158 | { | |
db1f069b MS |
159 | _cupsLangPuts(stderr, |
160 | _("INFO: Printer busy; will retry in 30 seconds...\n")); | |
ef416fc2 | 161 | sleep(30); |
162 | } | |
163 | } | |
164 | } | |
165 | while (scsi_fd == -1); | |
166 | ||
757d2cad | 167 | fputs("STATE: -connecting-to-device\n", stderr); |
168 | ||
ef416fc2 | 169 | /* |
170 | * Now that we are "connected" to the port, ignore SIGTERM so that we | |
171 | * can finish out any page data the driver sends (e.g. to eject the | |
172 | * current page... Only ignore SIGTERM if we are printing data from | |
173 | * stdin (otherwise you can't cancel raw jobs...) | |
174 | */ | |
175 | ||
176 | if (fd != 0) | |
177 | { | |
178 | # ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */ | |
179 | sigset(SIGTERM, SIG_IGN); | |
180 | # elif defined(HAVE_SIGACTION) | |
181 | memset(&action, 0, sizeof(action)); | |
182 | ||
183 | sigemptyset(&action.sa_mask); | |
184 | action.sa_handler = SIG_IGN; | |
185 | sigaction(SIGTERM, &action, NULL); | |
186 | # else | |
187 | signal(SIGTERM, SIG_IGN); | |
188 | # endif /* HAVE_SIGSET */ | |
189 | } | |
190 | ||
191 | /* | |
192 | * Copy the print file to the device... | |
193 | */ | |
194 | ||
195 | while (copies > 0) | |
196 | { | |
197 | if (fd != 0) | |
198 | lseek(fd, 0, SEEK_SET); | |
199 | ||
200 | while ((bytes = read(fd, buffer, sizeof(buffer))) > 0) | |
201 | { | |
202 | memset(&scsi_req, 0, sizeof(scsi_req)); | |
203 | ||
204 | scsi_req.interface_id = 'S'; | |
205 | scsi_req.dxfer_direction = SG_DXFER_TO_DEV; | |
206 | scsi_req.cmd_len = 6; | |
207 | scsi_req.mx_sb_len = sizeof(scsi_sense); | |
208 | scsi_req.iovec_count = 0; | |
209 | scsi_req.dxfer_len = bytes; | |
210 | scsi_req.dxferp = buffer; | |
211 | scsi_req.cmdp = scsi_cmd; | |
212 | scsi_req.sbp = scsi_sense; | |
213 | scsi_req.timeout = 60 * 1000; | |
214 | ||
215 | scsi_cmd[0] = 0x0a; /* Group 0 print command */ | |
216 | scsi_cmd[1] = 0x00; | |
217 | scsi_cmd[2] = bytes / 65536; | |
218 | scsi_cmd[3] = bytes / 256; | |
219 | scsi_cmd[4] = bytes; | |
220 | scsi_cmd[5] = 0x00; | |
221 | ||
222 | for (try = 0; try < 10; try ++) | |
223 | if (ioctl(scsi_fd, SG_IO, &scsi_req) < 0 || | |
224 | scsi_req.status != 0) | |
225 | { | |
db1f069b MS |
226 | _cupsLangPrintf(stderr, |
227 | _("WARNING: SCSI command timed out (%d); " | |
228 | "retrying...\n"), scsi_req.status); | |
ef416fc2 | 229 | sleep(try + 1); |
230 | } | |
231 | else | |
232 | break; | |
233 | ||
234 | if (try >= 10) | |
235 | { | |
db1f069b MS |
236 | _cupsLangPrintf(stderr, _("ERROR: Unable to send print data (%d)\n"), |
237 | scsi_req.status); | |
ef416fc2 | 238 | close(scsi_fd); |
239 | return (CUPS_BACKEND_FAILED); | |
240 | } | |
241 | } | |
242 | ||
243 | copies --; | |
244 | } | |
245 | ||
246 | /* | |
247 | * Close the device and return... | |
248 | */ | |
249 | ||
250 | close(fd); | |
251 | ||
252 | return (CUPS_BACKEND_OK); | |
253 | } | |
254 | #endif /* !SG_DXFER_TO_DEV */ | |
255 | ||
256 | ||
257 | /* | |
2e4ff8af | 258 | * End of "$Id: scsi-linux.c 6834 2007-08-22 18:29:25Z mike $". |
ef416fc2 | 259 | */ |