source: branches/2.2.9/mindi-busybox/libbb/getpty.c @ 2725

Last change on this file since 2725 was 2725, checked in by bruno, 8 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 1.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini getpty implementation for busybox
4 * Bjorn Wesen, Axis Communications AB (bjornw@axis.com)
5 *
6 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
7 */
8
9#include "libbb.h"
10
11#define DEBUG 0
12
13int FAST_FUNC xgetpty(char *line)
14{
15    int p;
16
17#if ENABLE_FEATURE_DEVPTS
18    p = open("/dev/ptmx", O_RDWR);
19    if (p > 0) {
20        grantpt(p); /* chmod+chown corresponding slave pty */
21        unlockpt(p); /* (what does this do?) */
22#if 0 /* if ptsname_r is not available... */
23        const char *name;
24        name = ptsname(p); /* find out the name of slave pty */
25        if (!name) {
26            bb_perror_msg_and_die("ptsname error (is /dev/pts mounted?)");
27        }
28        safe_strncpy(line, name, GETPTY_BUFSIZE);
29#else
30        /* find out the name of slave pty */
31        if (ptsname_r(p, line, GETPTY_BUFSIZE-1) != 0) {
32            bb_perror_msg_and_die("ptsname error (is /dev/pts mounted?)");
33        }
34        line[GETPTY_BUFSIZE-1] = '\0';
35#endif
36        return p;
37    }
38#else
39    struct stat stb;
40    int i;
41    int j;
42
43    strcpy(line, "/dev/ptyXX");
44
45    for (i = 0; i < 16; i++) {
46        line[8] = "pqrstuvwxyzabcde"[i];
47        line[9] = '0';
48        if (stat(line, &stb) < 0) {
49            continue;
50        }
51        for (j = 0; j < 16; j++) {
52            line[9] = j < 10 ? j + '0' : j - 10 + 'a';
53            if (DEBUG)
54                fprintf(stderr, "Trying to open device: %s\n", line);
55            p = open(line, O_RDWR | O_NOCTTY);
56            if (p >= 0) {
57                line[5] = 't';
58                return p;
59            }
60        }
61    }
62#endif /* FEATURE_DEVPTS */
63    bb_error_msg_and_die("can't find free pty");
64}
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