commit a988abd0be551c0c37fc20b49b233c8a22ebfe7a
parent 1a7f00653697b147d3be949c448b820f1e5fddbf
Author: tgoodwin <tgoodwin>
Date: Wed, 21 Oct 1998 11:00:16 +0000
Initial revision
Diffstat:
| A | open.c | | | 45 | +++++++++++++++++++++++++++++++++++++++++++++ |
1 file changed, 45 insertions(+), 0 deletions(-)
diff --git a/open.c 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);
+ }
+}
+
