1 files changed, 39 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/linux/wait4.c b/libc-top-half/musl/src/linux/wait4.c
new file mode 100644
index 0000000..83650e3
--- /dev/null
+++ b/libc-top-half/musl/src/linux/wait4.c
@@ -0,0 +1,39 @@
+#define _GNU_SOURCE
+#include <sys/wait.h>
+#include <sys/resource.h>
+#include <string.h>
+#include <errno.h>
+#include "syscall.h"
+
+pid_t wait4(pid_t pid, int *status, int options, struct rusage *ru)
+{
+	int r;
+#ifdef SYS_wait4_time64
+	if (ru) {
+		long long kru64[18];
+		r = __syscall(SYS_wait4_time64, pid, status, options, kru64);
+		if (!r) {
+			ru->ru_utime = (struct timeval)
+				{ .tv_sec = kru64[0], .tv_usec = kru64[1] };
+			ru->ru_stime = (struct timeval)
+				{ .tv_sec = kru64[2], .tv_usec = kru64[3] };
+			char *slots = (char *)&ru->ru_maxrss;
+			for (int i=0; i<14; i++)
+				*(long *)(slots + i*sizeof(long)) = kru64[4+i];
+		}
+		if (SYS_wait4_time64 == SYS_wait4 || r != -ENOSYS)
+			return __syscall_ret(r);
+	}
+#endif
+	char *dest = ru ? (char *)&ru->ru_maxrss - 4*sizeof(long) : 0;
+	r = __syscall(SYS_wait4, pid, status, options, dest);
+	if (r>0 && ru && sizeof(time_t) > sizeof(long)) {
+		long kru[4];
+		memcpy(kru, dest, 4*sizeof(long));
+		ru->ru_utime = (struct timeval)
+			{ .tv_sec = kru[0], .tv_usec = kru[1] };
+		ru->ru_stime = (struct timeval)
+			{ .tv_sec = kru[2], .tv_usec = kru[3] };
+	}
+	return __syscall_ret(r);
+}