lib/util: added set_close_on_exec()

this was already in tevent_util.c, but library layering prevented us
from using it in some other libraries

2 files changed, 23 insertions, 0 deletions

diff --git a/lib/util/blocking.c b/lib/util/blocking.c
index f5933cc92b..9dede7aa0d 100644
--- a/lib/util/blocking.c
+++ b/lib/util/blocking.c
@@ -60,3 +60,21 @@ _PUBLIC_ int set_blocking(int fd, bool set)
 	return fcntl( fd, F_SETFL, val);
 #undef FLAG_TO_SET
 }
+
+
+_PUBLIC_ bool set_close_on_exec(int fd)
+{
+#ifdef FD_CLOEXEC
+	int val;
+
+	val = fcntl(fd, F_GETFD, 0);
+	if (val >= 0) {
+		val |= FD_CLOEXEC;
+		val = fcntl(fd, F_SETFD, val);
+		if (val != -1) {
+			return true;
+		}
+	}
+#endif
+	return false;
+}
diff --git a/lib/util/samba_util.h b/lib/util/samba_util.h
index 9a76fa9f04..3b5169d744 100644
--- a/lib/util/samba_util.h
+++ b/lib/util/samba_util.h
@@ -668,6 +668,11 @@ _PUBLIC_ bool directory_create_or_exist(const char *dname, uid_t uid,
 _PUBLIC_ int set_blocking(int fd, bool set);
 
 /**
+   set close on exec on a file descriptor if available
+ **/
+_PUBLIC_ bool set_close_on_exec(int fd);
+
+/**
  Sleep for a specified number of milliseconds.
 **/
 _PUBLIC_ void smb_msleep(unsigned int t);