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annotate terminal.c @ 832:0433fdd9ba66

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Added a command line option to force BlastEm to not open a new terminal even if it detects that stdin/out are not terminals
author Michael Pavone <pavone@retrodev.com>
date Mon, 19 Oct 2015 19:16:28 -0700
parents 792be135d3af
children 794ba17f0716
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794
792be135d3af Spawn a terminal for the debugger when needed if we are not already attached to one
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1 #include <sys/types.h>
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2 #include <sys/stat.h>
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3 #include <unistd.h>
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4 #include <fcntl.h>
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5 #include <stdlib.h>
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6 #include <stdint.h>
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7 #include <signal.h>
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8 #include "util.h"
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9 #include "terminal.h"
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10
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11 pid_t child;
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12
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13 void cleanup_terminal()
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14 {
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15 kill(child, SIGKILL);
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16 unlink(INPUT_PATH);
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17 unlink(OUTPUT_PATH);
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18 }
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19
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0433fdd9ba66 Added a command line option to force BlastEm to not open a new terminal even if it detects that stdin/out are not terminals
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20 static char init_done;
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0433fdd9ba66 Added a command line option to force BlastEm to not open a new terminal even if it detects that stdin/out are not terminals
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22 void force_no_terminal()
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23 {
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24 init_done = 1;
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25 }
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26
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27 void init_terminal()
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28 {
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29 if (!init_done) {
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30 if (!(isatty(STDIN_FILENO) && isatty(STDOUT_FILENO))) {
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31 #ifndef __APPLE__
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32 //check to see if x-terminal-emulator exists, just use xterm if it doesn't
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33 char *term = system("which x-terminal-emulator > /dev/null") ? "xterm" : "x-terminal-emulator";
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34 #endif
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35 //get rid of FIFO's if they already exist
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36 unlink(INPUT_PATH);
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37 unlink(OUTPUT_PATH);
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38 //create FIFOs for talking to helper process in terminal app
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39 mkfifo(INPUT_PATH, 0666);
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40 mkfifo(OUTPUT_PATH, 0666);
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42 //close existing file descriptors
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43 close(STDIN_FILENO);
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44 close(STDOUT_FILENO);
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45 close(STDERR_FILENO);
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46
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47 child = fork();
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48 if (child == -1) {
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49 //error, oh well
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50 warning("Failed to fork for terminal spawn");
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51 } else if (!child) {
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52 //child process, exec our terminal emulator
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53 #ifdef __APPLE__
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54 execlp("open", "open", "./termhelper", NULL);
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55 #else
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56 execlp(term, term, "-title", "BlastEm Debugger", "-e", "./termhelper", NULL);
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57 #endif
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58 } else {
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59 //connect to the FIFOs, these will block so order is important
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60 open(INPUT_PATH, O_RDONLY);
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61 open(OUTPUT_PATH, O_WRONLY);
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62 atexit(cleanup_terminal);
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63 if (-1 == dup(STDOUT_FILENO)) {
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64 fatal_error("failed to dup STDOUT to STDERR after terminal fork");
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65 }
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66 }
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67 }
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69 init_done = 1;
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70 }
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71 }