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annotate ptyhelper.c @ 137:f14e92f6d955

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webtty: don't hardcode paths.
author John "Elwin" Edwards
date Thu, 18 Jul 2013 10:36:58 -0700
parents 9bef0941c6dd
children
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1
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John "Elwin" Edwards <elwin@sdf.org>
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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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88 perror("execvp() failed");
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89 return 1;
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90 }
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91 close(ptyslave);
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92
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93 while (1) {
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94 /* Now do a select() over stdin and ptymaster, and write anything that
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95 * appears to ptymaster and stdout respectively. */
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96 FD_ZERO(&readset);
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97 FD_SET(0, &readset);
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98 FD_SET(ptymaster, &readset);
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99 select_time.tv_sec = 1;
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100 select_time.tv_usec = 0;
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101 selstatus = select(ptymaster + 1, &readset, NULL, NULL, &select_time);
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102 if (selstatus > 0) {
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103 /* TODO make sure it all gets written if a signal interrupts write(). */
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104 if (FD_ISSET(0, &readset)) {
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105 nread = read(0, buf, 4096);
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106 if (nread > 0) {
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107 write(ptymaster, buf, nread);
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108 }
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109 }
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110 if (FD_ISSET(ptymaster, &readset)) {
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111 nread = read(ptymaster, buf, 4096);
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112 if (nread > 0) {
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113 write(1, buf, nread);
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114 }
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115 }
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116 }
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117
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118 /* Periodically check to see if we're done. */
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119 /* TODO: catch SIGCHLD and only wait() if it is delivered. */
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120 if (waitpid(child, &status, WNOHANG)) {
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121 break;
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122 }
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123
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124 /* If node sighup's us, pass it along. */
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125 if (got_sighup) {
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126 kill(child, SIGHUP);
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127 }
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128 }
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129
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130 /* Get any leftover output and clean up. */
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131 /* FIXME looping over select() is pointless if there's only one fd that
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132 * nothing's writing to. Just loop over read() until it's empty. */
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133 while (1) {
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134 FD_ZERO(&readset);
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135 FD_SET(ptymaster, &readset);
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136 select_time.tv_sec = 0;
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137 select_time.tv_usec = 0;
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138 if (select(ptymaster + 1, &readset, NULL, NULL, &select_time) > 0) {
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139 nread = read(ptymaster, buf, 4096);
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140 if (nread > 0) {
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141 write(1, buf, nread);
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142 }
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143 else
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144 break;
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145 }
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146 else
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147 break;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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148 }
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parents:
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149 close(ptymaster);
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parents:
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150
bd412f63ce0d Put this project under version control, finally.
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parents:
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151 /* Return the child's exit status. */
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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152 if (WIFEXITED(status))
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John "Elwin" Edwards <elwin@sdf.org>
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153 return WEXITSTATUS(status);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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154 return 0;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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155 }