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annotate ptyhelper.c @ 63:a077f9f84052

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RLG-Web client: adjust polling for watching. The ajaxterm state machine assumed data appears in response to user actions, which is not true when watching. It now uses different sets of parameters for playing and watching.
author John "Elwin" Edwards <elwin@sdf.org>
date Wed, 20 Jun 2012 07:41:59 -0700
parents 9bef0941c6dd
children
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1
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1 /*
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2 * ptyhelper: a utility that runs a command in a pseudoterm and then streams
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3 * stdio to/from it. Intended to get around the node.js loss of C/UNIX
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4 * functionality.
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5 * Remember to compile with -lutil.
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6 */
0
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <unistd.h>
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10 #include <signal.h>
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11 #include <pty.h>
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12 #include <utmp.h>
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13 #include <sys/types.h>
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14 #include <sys/wait.h>
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15 #include <sys/select.h>
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16 #include <termios.h>
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17
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18 int got_sighup = 0;
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19
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20 void handle_HUP(int signum) {
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21 if (signum == SIGHUP)
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22 got_sighup = 1;
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23 return;
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24 }
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25
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26 int main(int argc, char *argv[]) {
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27
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28 int ptymaster, ptyslave; /* File descriptors */
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29 int child;
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30 int status, selstatus;
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31 int w = 80, h = 24, t;
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32 struct sigaction sighup_act;
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33 fd_set readset;
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34 struct timeval select_time;
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35 char buf[4096];
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36 int nread;
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37 char *penv, *ptmp;
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38 #if 0
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39 struct termios ptysettings;
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40 #endif
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41 struct winsize ptysize;
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42
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43 if (argc == 1) {
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44 fprintf(stderr, "No command given.\n");
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45 exit(1);
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46 }
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47
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48 /* Set up the signal handler. */
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49 sighup_act.sa_handler = &handle_HUP;
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50 sighup_act.sa_flags = SA_RESTART;
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51 sigaction(SIGHUP, &sighup_act, NULL);
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52
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53 /* Check the environment for configuration options. */
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54 penv = getenv("PTYHELPER");
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55 if (penv != NULL) {
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56 t = strtol(penv, &ptmp, 10);
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57 if (t > 0 && t < 256)
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58 h = t;
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59 if (*ptmp != '\0') {
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60 penv = ptmp + 1;
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61 t = strtol(penv, &ptmp, 10);
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62 if (t > 0 && t < 256)
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63 w = t;
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64 }
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65 }
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66 /* Set up the size. */
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67 ptysize.ws_row = h;
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68 ptysize.ws_col = w;
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69
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70 /* Open a pty */
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71 if (openpty(&ptymaster, &ptyslave, NULL, NULL, &ptysize)) {
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72 return 1;
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73 }
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74 #if 0
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75 /* Put it into raw mode. */
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76 tcgetattr(ptyslave, &ptysettings);
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77 cfmakeraw(&ptysettings);
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78 tcsetattr(ptyslave, TCSANOW, &ptysettings);
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79 #endif
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80
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81 /* Start the child */
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82 /* forkpty() might be more convenient. */
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83 if (!(child = fork())) {
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84 /* Child process */
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85 login_tty(ptyslave);
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86 close(ptymaster);
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87 execvp(argv[1], argv + 1);
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