source getpty() out to pty.c

1 files changed, 41 insertions, 0 deletions

diff --git a/pty.c b/pty.c
new file mode 100644
index 0000000..a3e43b0
--- /dev/null
+++ b/pty.c
@@ -0,0 +1,41 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#if !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
+#include <pty.h>
+#endif
+
+extern int ptm, pts;
+
+void
+getpty(void) {
+	char *ptsdev;
+
+#if defined(_GNU_SOURCE)
+	ptm = getpt();
+#elif _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
+	ptm = posix_openpt(O_RDWR);
+#else
+	ptm = open("/dev/ptmx", O_RDWR);
+	if(ptm == -1)
+		if(openpty(&ptm, &pts, NULL, NULL, NULL) == -1)
+			eprintn("error, cannot open pty");
+#endif
+#if defined(_XOPEN_SOURCE)
+	if(ptm != -1) {
+		if(grantpt(ptm) == -1)
+			eprintn("error, cannot grant access to pty");
+		if(unlockpt(ptm) == -1)
+			eprintn("error, cannot unlock pty");
+		ptsdev = ptsname(ptm);
+		if(!ptsdev)
+			eprintn("error, slave pty name undefined");
+		pts = open(ptsdev, O_RDWR);
+		if(pts == -1)
+			eprintn("error, cannot open slave pty");
+	}
+	else
+		eprintn("error, cannot open pty");
+#endif
+}