[3320] | 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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