add vhangup syscall wrapper

request/patch by william haddonthethird, slightly modifed to add
_GNU_SOURCE feature test macro so that the compiler can verify the
prototype matches.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/linux/vhangup.c b/src/linux/vhangup.c
new file mode 100644
index 0000000..0203071
--- /dev/null
+++ b/src/linux/vhangup.c
@@ -0,0 +1,8 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include "syscall.h"
+
+int vhangup(void)
+{
+	return syscall(SYS_vhangup);
+}