1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini getpty implementation for busybox
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4 | * Bjorn Wesen, Axis Communications AB (bjornw@axis.com)
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5 | *
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6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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7 | */
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8 |
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9 | #include "libbb.h"
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10 |
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11 | #define DEBUG 0
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12 |
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13 | int FAST_FUNC xgetpty(char *line)
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14 | {
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15 | int p;
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16 |
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17 | #if ENABLE_FEATURE_DEVPTS
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18 | p = open("/dev/ptmx", O_RDWR);
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19 | if (p > 0) {
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20 | grantpt(p); /* chmod+chown corresponding slave pty */
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21 | unlockpt(p); /* (what does this do?) */
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22 | #if 0 /* if ptsname_r is not available... */
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23 | const char *name;
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24 | name = ptsname(p); /* find out the name of slave pty */
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25 | if (!name) {
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26 | bb_perror_msg_and_die("ptsname error (is /dev/pts mounted?)");
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27 | }
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28 | safe_strncpy(line, name, GETPTY_BUFSIZE);
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29 | #else
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30 | /* find out the name of slave pty */
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31 | if (ptsname_r(p, line, GETPTY_BUFSIZE-1) != 0) {
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32 | bb_perror_msg_and_die("ptsname error (is /dev/pts mounted?)");
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33 | }
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34 | line[GETPTY_BUFSIZE-1] = '\0';
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35 | #endif
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36 | return p;
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37 | }
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38 | #else
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39 | struct stat stb;
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40 | int i;
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41 | int j;
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42 |
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43 | strcpy(line, "/dev/ptyXX");
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44 |
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45 | for (i = 0; i < 16; i++) {
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46 | line[8] = "pqrstuvwxyzabcde"[i];
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47 | line[9] = '0';
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48 | if (stat(line, &stb) < 0) {
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49 | continue;
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50 | }
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51 | for (j = 0; j < 16; j++) {
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52 | line[9] = j < 10 ? j + '0' : j - 10 + 'a';
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53 | if (DEBUG)
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54 | fprintf(stderr, "Trying to open device: %s\n", line);
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55 | p = open(line, O_RDWR | O_NOCTTY);
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56 | if (p >= 0) {
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57 | line[5] = 't';
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58 | return p;
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59 | }
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60 | }
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61 | }
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62 | #endif /* FEATURE_DEVPTS */
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63 | bb_error_msg_and_die("can't find free pty");
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64 | }
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