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annotate ptyhelper.c @ 0:bd412f63ce0d

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Put this project under version control, finally.
author John "Elwin" Edwards <elwin@sdf.org>
date Sun, 06 May 2012 08:45:40 -0700
parents
children 9bef0941c6dd
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bd412f63ce0d Put this project under version control, finally.
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <unistd.h>
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4 #include <signal.h>
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5 #include <pty.h>
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6 #include <utmp.h>
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7 #include <sys/types.h>
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8 #include <sys/wait.h>
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9 #include <sys/select.h>
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10 #include <termios.h>
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11
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12 int got_sighup = 0;
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13
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14 void handle_HUP(int signum) {
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15 if (signum == SIGHUP)
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16 got_sighup = 1;
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17 return;
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18 }
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19
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20 int main(int argc, char *argv[]) {
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21
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22 int ptymaster, ptyslave; /* File descriptors */
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23 int child;
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24 int status, selstatus;
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25 int w = 80, h = 24, t;
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26 struct sigaction sighup_act;
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27 fd_set readset;
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28 struct timeval select_time;
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29 char buf[4096];
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30 int nread;
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31 char *penv, *ptmp;
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32 #if 0
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33 struct termios ptysettings;
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34 #endif
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35 struct winsize ptysize;
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36
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37 if (argc == 1) {
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38 fprintf(stderr, "No command given.\n");
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39 exit(1);
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40 }
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41
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42 /* Set up the signal handler. */
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43 sighup_act.sa_handler = &handle_HUP;
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44 sighup_act.sa_flags = SA_RESTART;
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45 sigaction(SIGHUP, &sighup_act, NULL);
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46
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47 /* Check the environment for configuration options. */
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48 penv = getenv("PTYHELPER");
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49 if (penv != NULL) {
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50 t = strtol(penv, &ptmp, 10);
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51 if (t > 0 && t < 256)
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52 h = t;
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53 if (*ptmp != '\0') {
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54 penv = ptmp + 1;
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55 t = strtol(penv, &ptmp, 10);
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56 if (t > 0 && t < 256)
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57 w = t;
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58 }
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59 }
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60 /* Set up the size. */
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61 ptysize.ws_row = h;
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62 ptysize.ws_col = w;
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63
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64 /* Open a pty */
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65 if (openpty(&ptymaster, &ptyslave, NULL, NULL, &ptysize)) {
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66 return 1;
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67 }
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68 #if 0
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69 /* Put it into raw mode. */
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70 tcgetattr(ptyslave, &ptysettings);
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71 cfmakeraw(&ptysettings);
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72 tcsetattr(ptyslave, TCSANOW, &ptysettings);
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73 #endif
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74
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75 /* Start the child */
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76 /* forkpty() might be more convenient. */
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77 if (!(child = fork())) {
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78 /* Child process */
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79 login_tty(ptyslave);
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80 close(ptymaster);
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81 execvp(argv[1], argv + 1);
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82 perror("execvp() failed");
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83 return 1;
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84 }
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85 close(ptyslave);
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86
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87 while (1) {