2 #define _XOPEN_SOURCE_EXTENDED
11 #include <sys/ioctl.h>
25 static void pty_size(void);
28 * Called to set up the pty.
30 * Returns an error message, or NULL on success.
32 * Also places the canonical host name into `realhost'. It must be
33 * freed by the caller.
35 static char *pty_init(char *host, int port, char **realhost, int nodelay)
38 char name[FILENAME_MAX];
41 pty_master_fd = open("/dev/ptmx", O_RDWR);
43 if (pty_master_fd < 0) {
44 perror("/dev/ptmx: open");
48 if (grantpt(pty_master_fd) < 0) {
53 if (unlockpt(pty_master_fd) < 0) {
58 name[FILENAME_MAX-1] = '\0';
59 strncpy(name, ptsname(pty_master_fd), FILENAME_MAX-1);
61 slavefd = open(name, O_RDWR);
63 perror("slave pty: open");
68 * Fork and execute the command.
85 fcntl(slavefd, F_SETFD, 0); /* don't close on exec */
91 tcsetpgrp(slavefd, getpgrp());
92 /* Close everything _else_, for tidiness. */
93 for (i = 3; i < 1024; i++)
96 execvp(pty_argv[0], pty_argv);
98 execl(getenv("SHELL"), getenv("SHELL"), NULL);
100 * If we're here, exec has gone badly foom.
112 * Called to send data down the pty.
114 static int pty_send(char *buf, int len)
117 int ret = write(pty_master_fd, buf, len);
119 perror("write pty master");
129 * Called to query the current socket sendability status.
131 static int pty_sendbuffer(void)
137 * Called to set the size of the window
139 static void pty_size(void)
143 size.ws_row = (unsigned short)rows;
144 size.ws_col = (unsigned short)cols;
145 ioctl(pty_master_fd, TIOCSWINSZ, (void *)&size);
150 * Send special codes.
152 static void pty_special(Telnet_Special code)
158 static Socket pty_socket(void)
160 return NULL; /* shouldn't ever be needed */
163 static int pty_sendok(void)
168 static void pty_unthrottle(int backlog)
173 static int pty_ldisc(int option)
175 return 0; /* neither editing nor echoing */
178 static int pty_exitcode(void)
180 /* Shouldn't ever be required */
184 Backend pty_backend = {