Mercurial > hg > rlgwebd
annotate ptyhelper.c @ 11:481dcee353c9
webtty: switch all server responses to JSON.
author | John "Elwin" Edwards <elwin@sdf.org> |
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date | Fri, 11 May 2012 13:33:48 -0700 |
parents | 9bef0941c6dd |
children |
rev | line source |
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1 | 1 /* |
2 * ptyhelper: a utility that runs a command in a pseudoterm and then streams | |
3 * stdio to/from it. Intended to get around the node.js loss of C/UNIX | |
4 * functionality. | |
5 * Remember to compile with -lutil. | |
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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88 perror("execvp() failed"); |