fd_util: add function dup_cloexec()

Unfortunately, there's no "optimized" implementation here. We can't use Linux's proprietary system call dup3(), because it would require us to specify the new descriptor.

fd_util: add function dup_cloexec()
68c02fc9 · Max Kellermann · d18c1b1a · 68c02fc9 · 68c02fc9
Commit 68c02fc9 authored Aug 03, 2010 by Max Kellermann
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fd_util.c src/fd_util.c +10 -0

fd_util.h src/fd_util.h +7 -0

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--- a/src/fd_util.c
+++ b/src/fd_util.c
@@ -104,6 +104,16 @@ fd_set_nonblock(int fd)
 }

 int
+dup_cloexec(int oldfd)
+{
+	int newfd = dup(oldfd);
+	if (newfd >= 0)
+		fd_set_nonblock(newfd);
+
+	return newfd;
+}
+
+int
 open_cloexec(const char *path_fs, int flags, int mode)
 {
 	int fd;

--- a/src/fd_util.h
+++ b/src/fd_util.h
@@ -50,6 +50,13 @@
 struct sockaddr;

 /**
+ * Wrapper for dup(), which sets the CLOEXEC flag on the new
+ * descriptor.
+ */
+int
+dup_cloexec(int oldfd);
+
+/**
 * Wrapper for open(), which sets the CLOEXEC flag (atomically if
 * supported by the OS).
 */