Initial revision

1 files changed, 45 insertions, 0 deletions

diff --git a/open.c b/open.c
new file mode 100644
index 0000000..137cb1d
--- /dev/null
+++ b/open.c
@@ -0,0 +1,45 @@
+/* open.c: to insulate <fcntl.h> from the rest of rc. */
+
+#include "rc.h"
+#include <fcntl.h>
+
+/*
+   Opens a file with the necessary flags. Assumes the following
+   declaration for redirtype:
+
+	enum redirtype {
+		rFrom, rCreate, rAppend, rHeredoc, rHerestring
+	};
+*/
+
+static const int mode_masks[] = {
+	/* rFrom */	O_RDONLY,
+	/* rCreate */	O_TRUNC | O_CREAT | O_WRONLY,
+	/* rAppend */	O_APPEND | O_CREAT | O_WRONLY
+};
+
+extern int rc_open(const char *name, redirtype m) {
+	if ((unsigned) m >= arraysize(mode_masks))
+		panic("bad mode passed to rc_open");
+	return open(name, mode_masks[m], 0666);
+}
+
+/* make a file descriptor non blocking. must only be called after read()
+has returned EAGAIN. */
+
+extern void makenonblock(int fd) {
+	int flags;
+
+	if ((flags = fcntl(fd, F_GETFL)) == -1) {
+		uerror("fcntl");
+		exit(1);
+	}
+	if (! (flags & O_NONBLOCK))
+		panic("not O_NONBLOCK");
+	flags &= ~O_NONBLOCK;
+	if (fcntl(fd, F_SETFL, (long) flags) == -1) {
+		uerror("fcntl");
+		exit(1);
+	}
+}
+