make ualarm actually work (obsolete function removed from SUS)

diff --git a/src/unistd/ualarm.c b/src/unistd/ualarm.c
index 1eb0869..855504b 100644 (file)
--- a/src/unistd/ualarm.c
+++ b/src/unistd/ualarm.c
@@ -1,8 +1,13 @@
+#define _GNU_SOURCE
 #include <unistd.h>
-#include "syscall.h"
+#include <sys/time.h>
 
-/* FIXME: ?? */
-unsigned ualarm(unsigned useconds, unsigned interval)
+unsigned ualarm(unsigned value, unsigned interval)
 {
-       return -1;
+       struct itimerval it = {
+               .it_interval.tv_usec = interval,
+               .it_value.tv_usec = value
+       };
+       setitimer(ITIMER_REAL, &it, &it);
+       return it.it_value.tv_sec*1000000 + it.it_value.tv_usec;
 }