| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini getpty implementation for busybox |
| * Bjorn Wesen, Axis Communications AB (bjornw@axis.com) |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| |
| #include "libbb.h" |
| |
| #define DEBUG 0 |
| |
| int FAST_FUNC xgetpty(char *line) |
| { |
| int p; |
| |
| #if ENABLE_FEATURE_DEVPTS |
| p = open("/dev/ptmx", O_RDWR); |
| if (p >= 0) { |
| grantpt(p); /* chmod+chown corresponding slave pty */ |
| unlockpt(p); /* (what does this do?) */ |
| # ifndef HAVE_PTSNAME_R |
| { |
| const char *name; |
| name = ptsname(p); /* find out the name of slave pty */ |
| if (!name) { |
| bb_perror_msg_and_die("ptsname error (is /dev/pts mounted?)"); |
| } |
| safe_strncpy(line, name, GETPTY_BUFSIZE); |
| } |
| # else |
| /* find out the name of slave pty */ |
| if (ptsname_r(p, line, GETPTY_BUFSIZE-1) != 0) { |
| bb_perror_msg_and_die("ptsname error (is /dev/pts mounted?)"); |
| } |
| line[GETPTY_BUFSIZE-1] = '\0'; |
| # endif |
| return p; |
| } |
| #else |
| struct stat stb; |
| int i; |
| int j; |
| |
| strcpy(line, "/dev/ptyXX"); |
| |
| for (i = 0; i < 16; i++) { |
| line[8] = "pqrstuvwxyzabcde"[i]; |
| line[9] = '0'; |
| if (stat(line, &stb) < 0) { |
| continue; |
| } |
| for (j = 0; j < 16; j++) { |
| line[9] = j < 10 ? j + '0' : j - 10 + 'a'; |
| if (DEBUG) |
| fprintf(stderr, "Trying to open device: %s\n", line); |
| p = open(line, O_RDWR | O_NOCTTY); |
| if (p >= 0) { |
| line[5] = 't'; |
| return p; |
| } |
| } |
| } |
| #endif /* FEATURE_DEVPTS */ |
| bb_error_msg_and_die("can't find free pty"); |
| } |