add (sadly) Linux-specific ioctl() to set controlling terminal

1 files changed, 19 insertions, 7 deletions

diff --git a/getty.c b/getty.c
index 45ff830..e44f299 100644
--- a/getty.c
+++ b/getty.c
@@ -30,6 +30,12 @@
 #include <string.h>
 #include <unistd.h>
 
+#ifdef __linux__
+#include <sys/ioctl.h>
+#define DEFAULT_GETTY_COMMAND "/bin/login"
+#define DEFAULT_GETTY_TYPE "vt100"
+#endif
+
 #ifndef DEFAULT_GETTY_COMMAND
 #define DEFAULT_GETTY_COMMAND "/sys/bin/login"
 #endif
@@ -74,7 +80,9 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 
-	int fd = open(device, O_RDWR, 0600);
+	setsid();
+
+	int fd = open(device, O_RDWR | O_CLOEXEC | O_TTY_INIT, 0600);
 	if (fd == -1) {
 		fprintf(stderr, "getty: %s: %s\n", device, strerror(errno));
 		return 1;
@@ -85,16 +93,20 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 
-	close(STDIN_FILENO);
-	close(STDOUT_FILENO);
-	close(STDERR_FILENO);
+
+	#ifdef __linux__
+	if (ioctl (fd, TIOCSCTTY, (void *) 1) == -1) {
+		perror("ioctl");
+	}
+	#endif
+
 	dup2(fd, STDIN_FILENO);
 	dup2(fd, STDOUT_FILENO);
 	dup2(fd, STDERR_FILENO);
-	close(fd);
 
 	setenv("TERM", type, 1);
-	/* TODO: wordexp() + execv() */
-	execl("/bin/sh", "/bin/sh", "-c", command, (char*)NULL);
+	/* TODO: wordexp() */
+	char *args[] = { command, NULL };
+	execv(args[0], args);
 	return 1;
 }