Spawn a terminal for the debugger when needed if we are not already attached to one

1 files changed, 65 insertions, 0 deletions

diff --git a/terminal.c b/terminal.c
new file mode 100644
index 0000000..0e952f2
--- /dev/null
+++ b/terminal.c
@@ -0,0 +1,65 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <signal.h>
+#include "util.h"
+#include "terminal.h"
+
+pid_t child;
+
+void cleanup_terminal()
+{
+	kill(child, SIGKILL);
+	unlink(INPUT_PATH);
+	unlink(OUTPUT_PATH);
+}
+
+void init_terminal()
+{
+	static char init_done;
+	if (!init_done) {
+		if (!(isatty(STDIN_FILENO) && isatty(STDOUT_FILENO))) {
+#ifndef __APPLE__
+			//check to see if x-terminal-emulator exists, just use xterm if it doesn't
+			char *term = system("which x-terminal-emulator > /dev/null") ? "xterm" : "x-terminal-emulator";
+#endif
+			//get rid of FIFO's if they already exist
+			unlink(INPUT_PATH);
+			unlink(OUTPUT_PATH);
+			//create FIFOs for talking to helper process in terminal app
+			mkfifo(INPUT_PATH, 0666);
+			mkfifo(OUTPUT_PATH, 0666);
+			
+			//close existing file descriptors
+			close(STDIN_FILENO);
+			close(STDOUT_FILENO);
+			close(STDERR_FILENO);
+
+			child = fork();
+			if (child == -1) {
+				//error, oh well
+				warning("Failed to fork for terminal spawn");
+			} else if (!child) {
+				//child process, exec our terminal emulator
+#ifdef __APPLE__
+				execlp("open", "open", "./termhelper", NULL);
+#else
+				execlp(term, term, "-title", "BlastEm Debugger", "-e", "./termhelper", NULL);
+#endif
+			} else {
+				//connect to the FIFOs, these will block so order is important
+				open(INPUT_PATH, O_RDONLY);
+				open(OUTPUT_PATH, O_WRONLY);
+				atexit(cleanup_terminal);
+				if (-1 == dup(STDOUT_FILENO)) {
+					fatal_error("failed to dup STDOUT to STDERR after terminal fork");
+				}
+			}
+		}
+	
+		init_done = 1;
+	}
+}