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| -rw-r--r-- | libbb/getpty.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/libbb/getpty.c b/libbb/getpty.c new file mode 100644 index 0000000..4b65188 --- /dev/null +++ b/libbb/getpty.c @@ -0,0 +1,56 @@ +/* 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 tarball for details. + */ + +#include "libbb.h" + +int getpty(char *line, int size) +{ + int p; +#if ENABLE_FEATURE_DEVPTS + p = open("/dev/ptmx", O_RDWR); + if (p > 0) { + const char *name; + grantpt(p); + unlockpt(p); + name = ptsname(p); + if (!name) { + bb_perror_msg("ptsname error (is /dev/pts mounted?)"); + return -1; + } + safe_strncpy(line, name, size); + 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 */ + return -1; +} + + |